Antenna assembly and electronic equipment

Abstract

The embodiment of the invention relates to the technical field of communication, in particular to an antenna assembly and electronic equipment, an antenna assembly matching circuit provided by the embodiment of the invention is used for enabling the antenna assembly to generate first resonance and second resonance, and the resonance frequency of the first resonance is smaller than that of the second resonance; the first resonance comprises a first sub-resonance and a second sub-resonance, and / or the second resonance comprises a third sub-resonance and a fourth sub-resonance; the resonant frequency of the first resonance is located in a first communication frequency band, and the resonant frequency of the second resonance is located in a second communication frequency band; the gap capacitor enables the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance to be smaller than or equal to 2GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, and the bandwidth of the antenna assembly can be further increased.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to an antenna assembly and an electronic device. Background Technology

[0002] Electronic devices (such as mobile phones and tablets) typically have antenna components, which enable wireless communication between the electronic device and communication base stations, satellites, and other equipment. However, the bandwidth of antenna components is generally small, which affects the communication performance of electronic devices. Summary of the Invention

[0003] This application provides an antenna assembly and an electronic device for improving the bandwidth of the antenna assembly.

[0004] In a first aspect, embodiments of this application provide an antenna assembly, including: a ground plane, a radiator, a matching circuit, and a slot capacitor. The radiator is disposed on the ground plane, and a first slot is formed between the radiator and the ground plane. Both ends of the radiator are grounded along the extension direction of the radiator. A second slot communicating with the first slot is provided on the radiator. The matching circuit is coupled to a feed point on the radiator. The matching circuit is used to enable the antenna assembly to generate a first resonance and a second resonance. The resonant frequency of the first resonance is less than the resonant frequency of the second resonance. The first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance. The radiators at both ends of the second slot are coupled through the slot capacitor, which is used to ensure that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0005] With the above configuration, the matching circuit is used to enable the antenna assembly to generate a first resonance and a second resonance, wherein the resonant frequency of the first resonance is less than the resonant frequency of the second resonance; the first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance; the resonant frequency of the first resonance is located within a first communication frequency band, and the resonant frequency of the second resonance is located within a second communication frequency band; the slot capacitor ensures that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly.

[0006] In some embodiments including the above examples, the length of the radiator along its extension direction can be approximately half the wavelength corresponding to the resonant frequency of the second resonance. This configuration reduces the length of the radiator while still ensuring the second resonance meets high-frequency requirements. Simultaneously, the resonant frequency of the first resonance can be adjusted using a slot capacitor so that the difference between the resonant frequencies of the first and second resonances is less than or equal to 2 GHz.

[0007] In some embodiments including the above examples, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the slot capacitor is less than or equal to 2 pF; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the capacitance value of the slot capacitor is less than or equal to 5 pF. This configuration ensures that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz, while avoiding an excessively large or small capacitance value for the slot capacitor. Of course, the slot capacitor can also be used for impedance matching of the antenna components.

[0008] In some embodiments including the above examples, the gap capacitor can be a distributed capacitor. For example, the gap capacitor may include a portion of the radiator at one end of the second gap, a portion of the radiator at the other end of the second gap, and the equivalent capacitance formed by the second gap. Of course, the gap capacitor can also be a lumped capacitor. For example, the gap capacitor may include a capacitor element, which may be disposed on the motherboard, or it may be disposed between the motherboard and the radiator.

[0009] In some embodiments including the above examples, the first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit, which includes a first inductor and a first capacitor, with the first inductor and the first capacitor connected in series. One end of the first capacitor is coupled to a feed point, and the other end of the first capacitor is coupled to one end of the first inductor. The other end of the first inductor can be coupled to a radio frequency device to receive radio frequency signals. Alternatively, one end of the first inductor is coupled to a feed point, and the other end of the first inductor is coupled to one end of the first capacitor. The other end of the first capacitor is coupled to a radio frequency device to receive radio frequency signals. The resonant frequencies of the first and second sub-resonants together cover the first communication frequency band, thereby increasing the bandwidth of the first resonance and further improving the bandwidth of the antenna assembly.

[0010] In some embodiments including the above-described embodiments, the resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator.

[0011] In some embodiments including the above examples, under the first sub-resonance and the second sub-resonance, the current direction on the radiator is the same; under the second resonance, the radiator has a first small current point, and the current directions on the radiators on both sides of the first small current point are opposite. With this configuration, under the first sub-resonance and the second sub-resonance, the antenna assembly operates in the same mode, both being common mode (CM mode); under the second resonance, the antenna assembly operates in differential mode (DM mode). It can be understood that the first small current point can be a position where the current on the radiator is close to zero.

[0012] In some embodiments including the above examples, the second resonance includes a third sub-resonance and a fourth sub-resonance, and the matching circuit includes a second sub-matching circuit. The second sub-matching circuit includes a second capacitor and a second inductor. One end of the second inductor is coupled to the feed point, one end of the second capacitor is connected to one end of the second inductor, the other end of the second capacitor is grounded, and the other end of the second inductor is configured to receive radio frequency signals. The resonant frequency bands of the third and fourth sub-resonances together cover the second communication frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0013] In some embodiments including the above embodiments, the radiator includes a midpoint in its extension direction, a feed point is located on one side of the midpoint, and a second slit is located on the other side of the midpoint.

[0014] In some embodiments including the above-described embodiments, the resonant frequency of the fourth sub-resonator is greater than the resonant frequency of the third sub-resonator.

[0015] In some embodiments including the above embodiments, under the first resonance, the current directions on the radiators are the same, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the radiators have a first small current point, and the current directions on the radiators on both sides of the first small current point are opposite, and the third and fourth sub-resonances are in the same mode, both being DM mode.

[0016] In some embodiments including the above examples, the radiator includes a midpoint along its extension direction, and the distance between the second slit and the midpoint is less than or equal to one-quarter of the radiator's length. This arrangement ensures that the difference between the resonant frequencies of the first and second resonators is moderate.

[0017] In some embodiments including the above examples, the radiator includes a first end and a second end, a feed point and a second gap are located between the first end and the second end, and the feed point is located between the second gap and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; such that the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is less than or equal to 150MHz. This arrangement allows the first and second sub-resonators to be close to each other, thereby ensuring communication quality within the communication frequency band corresponding to the first resonator; on the other hand, it also allows the resonant frequencies of both the first and second sub-resonators to be located within their respective communication frequency bands.

[0018] In some embodiments including the above examples, the radiator includes a first end and a second end, a feed point and a second gap are located between the first end and the second end, and the feed point is located between the second gap and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; such that the difference between the resonant frequency of the third sub-resonator and the resonant frequency of the fourth sub-resonator is less than or equal to 500MHz. This arrangement allows the third and fourth sub-resonators to be close to each other, thereby ensuring communication quality within the communication frequency band corresponding to the second resonator; on the other hand, it also allows the resonant frequencies of the third and fourth sub-resonators to both be located within their respective communication frequency bands.

[0019] In some embodiments including the above examples, both the first and second resonances are dual resonances; that is, the first resonance includes a first sub-resonant and a second sub-resonant, and the second resonance includes a third sub-resonant and a fourth sub-resonant. The first and second sub-resonants together cover the first communication frequency band to increase the bandwidth of the first resonance, and the third and fourth sub-resonants together cover the second communication frequency band to increase the bandwidth of the second resonance. Through this arrangement, the bandwidth of the first and second resonances can be increased, further increasing the bandwidth of the antenna assembly.

[0020] Secondly, embodiments of this application also provide an antenna assembly, including: a ground plane, a radiator, a matching circuit, and a grounding inductor. The radiator is disposed on the ground plane, and both ends of the radiator are open terminals along its extension direction. The matching circuit is coupled to a feed point on the radiator, and the matching circuit is used to enable the antenna assembly to generate a first resonance and a second resonance, wherein the resonant frequency of the first resonance is less than the resonant frequency of the second resonance. The first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance. One end of the grounding inductor is coupled to a grounding point on the radiator, and the other end of the grounding inductor is grounded. The grounding inductor is used to ensure that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0021] With the above configuration, the matching circuit is used to enable the antenna assembly to generate a first resonance and a second resonance, wherein the resonant frequency of the first resonance is less than the resonant frequency of the second resonance; the first resonance includes a first sub-resonant and a second sub-resonant, and / or the second resonance includes a third sub-resonant and a fourth sub-resonant; the resonant frequency of the first resonance is located within a first communication frequency band, and the resonant frequency of the second resonance is located within a second communication frequency band; the grounding inductor ensures that the difference between the resonant frequencies of the first and second resonances is less than or equal to 2 GHz, thereby enabling the first and second communication frequency bands to cover different communication frequency bands, which can increase the bandwidth of the antenna assembly.

[0022] In some embodiments, including the above-described examples, the length of the radiator along its extension direction can be approximately half the wavelength corresponding to the resonant frequency of the second resonance. This configuration reduces the length of the radiator while ensuring the second resonance meets high-frequency requirements. Simultaneously, the first resonance can be adjusted via a grounding inductor so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0023] In some embodiments including the above examples, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 3 nH; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 5 nH. This ensures that the inductance value of the grounding inductor 116 is appropriate. Of course, the impedance matching of the antenna components can also be achieved through the grounding inductor.

[0024] In some embodiments including the above examples, the grounding inductor can be a distributed inductor. For example, the grounding inductor can include a conductor (such as a metal sheet, wire, etc.) with a certain degree of inductance located between the floor and the radiator. Of course, the grounding inductor can also be a lumped inductor. For example, the grounding inductor can include an inductor device, which can be disposed on the motherboard, or it can be disposed between the motherboard and the radiator.

[0025] In some embodiments including the above examples, the first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit, which includes a first inductor and a first capacitor, with the first inductor and the first capacitor connected in series. The first sub-matching circuit enables the antenna assembly to form both the first and second sub-resonances. The resonant frequencies of the first and second sub-resonances together cover the first communication frequency band, thereby increasing the bandwidth of the first resonance and further improving the bandwidth of the antenna assembly.

[0026] In some embodiments including the above-described embodiments, the resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator.

[0027] In some embodiments including the above examples, under the first sub-resonance and the second sub-resonance, the radiator has a second small current point, and the current directions on both sides of the second small current point are opposite; under the second resonance, the current directions on the radiator are the same. With this configuration, under the first sub-resonance and the second sub-resonance, the antenna assembly operates in the same mode, DM mode; under the second resonance, the antenna assembly operates in CM mode. It can be understood that the second small current point can be a position where the current on the radiator is close to zero.

[0028] In some embodiments including the above examples, the second resonance includes a third sub-resonance and a fourth sub-resonance, and the matching circuit includes a second sub-matching circuit. The second sub-matching circuit includes a second capacitor and a second inductor. One end of the second inductor is coupled to the feed point, one end of the second capacitor is connected to one end of the second inductor, the other end of the second capacitor is grounded, and the other end of the second inductor is configured to receive radio frequency signals. The second sub-matching circuit enables the antenna assembly to form a third sub-resonance and a fourth sub-resonance. The resonant frequency bands of the third and fourth sub-resonances jointly cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0029] In some embodiments including the above embodiments, the radiator includes a midpoint in its extension direction, the feed point and the ground point are both located on the same side of the midpoint, and the ground point is located between the feed point and the midpoint.

[0030] In some embodiments, including the above-described examples, the distance between the feed point and the ground point is less than or equal to one-eighth of the radiator length, and the distance between the ground point and the midpoint is less than or equal to three-eighths of the radiator length. This arrangement ensures that the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is moderate.

[0031] In some embodiments including the above-described embodiments, the resonant frequency of the fourth sub-resonator is greater than the resonant frequency of the third sub-resonator.

[0032] In some embodiments including the above examples, under the first resonance, the radiator has a second small current point, and the current directions on the radiators on both sides of the second small current point are opposite; under the third and fourth sub-resonances, the current directions on the radiators are the same. With this configuration, under the first resonance, the antenna assembly is in CM mode; under the third and fourth sub-resonances, the antenna assembly operates in the same mode, DM mode.

[0033] In some embodiments including the above examples, the radiator includes a first end and a second end, a feed point and a ground point are located between the first end and the second end, and the feed point is located between the ground point and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; such that the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is less than or equal to 150MHz. This arrangement allows the first and second sub-resonators to be close to each other, thereby ensuring communication quality within the first resonant frequency band; on the other hand, it also allows the resonant frequencies of the first and second sub-resonators to both be located within their respective communication frequency bands.

[0034] In some embodiments including the above examples, the radiator includes a first end and a second end, a feed point and a ground point are located between the first end and the second end, and the feed point is located between the ground point and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; such that the difference between the resonant frequency of the third sub-resonator and the resonant frequency of the fourth sub-resonator is less than or equal to 500MHz. This arrangement allows the third and fourth sub-resonators to be close to each other, thereby ensuring communication quality within the second resonant frequency band; on the other hand, it also allows the resonant frequencies of the third and fourth sub-resonators to both be located within their respective communication frequency bands.

[0035] In some embodiments including the above examples, both the first resonance and the second resonance are dual resonances. That is, the first resonance includes a first sub-resonance and a second sub-resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance. The first and second sub-resonances together cover the first resonant frequency band to increase the bandwidth of the first resonance, and the third and fourth sub-resonances together cover the second resonant frequency band to increase the bandwidth of the second resonance. Through the above arrangement, the bandwidth of the first and second resonances can be increased, further increasing the bandwidth of the antenna assembly.

[0036] In some embodiments including the above-described examples, the floor includes adjacent first and second sides, and the radiator includes a first branch opposite to the first side and a second branch opposite to the second side. That is, the radiator is positioned at a corner of the floor, which allows for full utilization of the floor space and improves the structural compactness of the electronic device.

[0037] Thirdly, embodiments of this application also provide an electronic device, including: a radio frequency device and an antenna assembly as described above, wherein the radio frequency device is coupled to a feed point. The antenna assembly in this electronic device can generate a first resonance and a second resonance, wherein the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0039] Figure 2 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 1 ;

[0040] Figure 3 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 2 ;

[0041] Figure 4Return loss of antenna assembly provided for embodiments of this application Figure 1 ;

[0042] Figure 5 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 1 ;

[0043] Figure 6 for Figure 3 A schematic diagram of the current of the antenna assembly shown.

[0044] Figure 7 Antenna efficiency of antenna components provided for embodiments of this application Figure 1 ;

[0045] Figure 8 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 3 ;

[0046] Figure 9 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 4 ;

[0047] Figure 10 Return loss of antenna assembly provided for embodiments of this application Figure 2 ;

[0048] Figure 11 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 2 ;

[0049] Figure 12 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 ;

[0050] Figure 13 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 5 ;

[0051] Figure 14 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 6 ;

[0052] Figure 15 Return loss of antenna assembly provided for embodiments of this application Figure 3 ;

[0053] Figure 16 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 3 ;

[0054] Figure 17 Antenna efficiency of antenna components provided for embodiments of this application Figure 3 ;

[0055] Figure 18Return loss of antenna assembly provided for embodiments of this application Figure 4 ;

[0056] Figure 19 Antenna efficiency of antenna components provided for embodiments of this application Figure 4 ;

[0057] Figure 20 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 7 ;

[0058] Figure 21 Return loss of antenna assembly provided for embodiments of this application Figure 5 ;

[0059] Figure 22 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 4 ;

[0060] Figure 23 Antenna efficiency of antenna components provided for embodiments of this application Figure 5 ;

[0061] Figure 24 for Figure 20 A schematic diagram of the current of the antenna assembly shown.

[0062] Figure 25 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 8 ;

[0063] Figure 26 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 9 ;

[0064] Figure 27 Return loss of antenna assembly provided for embodiments of this application Figure 6 ;

[0065] Figure 28 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 5 ;

[0066] Figure 29 Antenna efficiency of antenna components provided for embodiments of this application Figure 6 ;

[0067] Figure 30 for Figure 26 A schematic diagram of the current of the antenna assembly shown.

[0068] Figure 31 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 ;

[0069] Figure 32 Return loss of antenna assembly provided for embodiments of this application Figure 7 ;

[0070] Figure 33 Antenna efficiency of antenna components provided for embodiments of this application Figure 7 ;

[0071] Figure 34 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 one;

[0072] Figure 35 Return loss of antenna assembly provided for embodiments of this application Figure 8 ;

[0073] Figure 36 Antenna efficiency of antenna components provided for embodiments of this application Figure 8 ;

[0074] Figure 37 Return loss of antenna assembly provided for embodiments of this application Figure 9 ;

[0075] Figure 38 Antenna efficiency of antenna components provided for embodiments of this application Figure 9 ;

[0076] Figure 39 Return loss of antenna assembly provided for embodiments of this application Figure 10 ;

[0077] Figure 40 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 ;

[0078] Figure 41 Return loss of antenna assembly provided for embodiments of this application Figure 10 one;

[0079] Figure 42 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 one;

[0080] Figure 43 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 two;

[0081] Figure 44 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 three;

[0082] Figure 45 Return loss of antenna assembly provided for embodiments of this application Figure 10 two;

[0083] Figure 46 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 two;

[0084] Figure 47 The diagram shows the current of the antenna assembly shown in Figure 44.

[0085] Figure 48 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 Four;

[0086] Figure 49 Return loss of antenna assembly provided for embodiments of this application Figure 10 three;

[0087] Figure 50 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 three;

[0088] Figure 51 for Figure 48 A schematic diagram of the current of the antenna assembly shown.

[0089] Figure 52a A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 five;

[0090] Figure 52b This is a schematic diagram of the structure of an antenna assembly with multiple grounding inductors provided in an embodiment of this application;

[0091] Figure 53 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 six;

[0092] Figure 54 Return loss of antenna assembly provided for embodiments of this application Figure 10 Four;

[0093] Figure 55 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 Four;

[0094] Figure 56 for Figure 53 A schematic diagram of the current of the antenna assembly shown.

[0095] Figure 57 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 seven;

[0096] Figure 58 Return loss of antenna assembly provided for embodiments of this application Figure 10 five;

[0097] Figure 59 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 6 ;

[0098] Figure 60 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 five;

[0099] Figure 61 for Figure 57 A schematic diagram of the current of the antenna assembly shown.

[0100] Figure 62 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 eight;

[0101] Figure 63 Return loss of antenna assembly provided for embodiments of this application Figure 10 six;

[0102] Figure 64 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 7 ;

[0103] Figure 65 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 six;

[0104] Figure 66 for Figure 62 A schematic diagram of the current of the antenna assembly shown.

[0105] Figure 67 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 10 Nine;

[0106] Figure 68 Return loss of antenna assembly provided for embodiments of this application Figure 10 seven;

[0107] Figure 69 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 8 ;

[0108] Figure 70 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 seven;

[0109] Figure 71 for Figure 67 A schematic diagram of the current of the antenna assembly shown.

[0110] Figure 72 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 2 ten;

[0111] Figure 73 Return loss of antenna assembly provided for embodiments of this application Figure 10 eight;

[0112] Figure 74 The impedance circle of the antenna assembly is provided for the embodiments of this application. Figure 9 ;

[0113] Figure 75 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 eight;

[0114] Figure 76 for Figure 72 A schematic diagram of the current of the antenna assembly shown.

[0115] Figure 77 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 2 eleven;

[0116] Figure 78 Return loss of antenna assembly provided for embodiments of this application Figure 10 Nine;

[0117] Figure 79 Antenna efficiency of antenna components provided for embodiments of this application Figure 10 Nine;

[0118] Figure 80 A schematic diagram of the antenna assembly is provided for the embodiments of this application. Figure 2 twelve;

[0119] Figure 81 Return loss of antenna assembly provided for embodiments of this application Figure 2 ten;

[0120] Figure 82 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 ten;

[0121] Figure 83 Return loss of antenna assembly provided for embodiments of this application Figure 2 eleven;

[0122] Figure 84 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 eleven;

[0123] Figure 85 Return loss of antenna assembly provided for embodiments of this application Figure 2 twelve;

[0124] Figure 86 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 twelve;

[0125] Figure 87 Return loss of antenna assembly provided for embodiments of this application Figure 2 Thirteen;

[0126] Figure 88 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 Thirteen;

[0127] Figure 89 Return loss of antenna assembly provided for embodiments of this application Figure 2 fourteen;

[0128] Figure 90 Antenna efficiency of antenna components provided for embodiments of this application Figure 2 fourteen;

[0129] Figure 91 This is a schematic diagram of the antenna structure corresponding to the line common-mode mode.

[0130] Figure 92 for Figure 91 Current and electric field distribution diagrams of the antenna structure;

[0131] Figure 93 This is a schematic diagram of the antenna structure corresponding to the line differential mode.

[0132] Figure 94 for Figure 93 Current and electric field distribution diagrams of the antenna structure;

[0133] Figure 95 This is a schematic diagram of the antenna structure corresponding to the slot common-mode mode.

[0134] Figure 96 for Figure 95 Current and electric field distribution diagrams of the antenna structure;

[0135] Figure 97 This is a schematic diagram of the antenna structure corresponding to the slot differential mode.

[0136] Figure 98 for Figure 97 Current and electric field distribution diagram of the antenna structure.

[0137] Explanation of reference numerals in the attached figures: 10: Electronic device; 11: Middle frame; 12: Display panel; 13: Main board; 14: Middle board; 15: Frame; 110: Radiator; 113: First gap; 114: Second gap; 115: Gap capacitance; 116: Grounding inductance; 120: Ground; 121: First side; 122: Second side; 130: Matching circuit; 131: First sub-matching circuit; 132: Second sub-matching circuit; a: Midpoint; b: Feed point; c: First small current point; d: Second small current point; e: Grounding point. Detailed Implementation

[0138] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0139] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0140] Furthermore, in the embodiments of this application, directional terms such as "up," "down," "left," "right," "horizontal," and "vertical" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0141] The following explains the terminology that may appear in the embodiments of this application.

[0142] Connection / Link: should be interpreted broadly. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0143] Coupling can be understood as direct coupling and / or indirect coupling. "Coupled connection" can be understood as a direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection," which can be understood as physical contact and electrical conduction between components; it can also be understood as the form of connection between different components in a circuit structure through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB). "Indirect coupling" can be understood as electrical conduction between two conductors through a gap / non-contact method. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by forming an equivalent capacitance through coupling between the gaps between two conductive parts.

[0144] Relative / Relative Setting: A and B relative setting can refer to A and B being face-to-face. For example, when two radiators are set relative to each other, the two radiators overlap in at least a partial area along a certain direction. In one embodiment, the two relatively set radiators are adjacent to each other and there are no other radiators or conductors other than antenna structures between them.

[0145] Lumped element / device: This refers to all components whose size is much smaller than the wavelength relative to the circuit's operating frequency. For signals, the characteristics of the components remain constant at all times, regardless of frequency.

[0146] Distributed elements / devices: Unlike lumped elements, if the size of an element is similar to or larger than the wavelength of the circuit's operating frequency, then when a signal passes through the element, the characteristics of each point on the element will vary due to the signal change. In this case, the element as a whole cannot be regarded as a single entity with fixed characteristics, but should be called a distributed element.

[0147] Capacitor / Capacitor Structure: This can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to capacitive components, such as capacitor elements; distributed capacitance (or distributed capacitance) refers to the equivalent capacitance formed by two conductive components separated by a certain gap.

[0148] Inductance / Inductor Structure: Can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to inductive components, such as inductor elements; distributed inductance (or distributed inductance) refers to the equivalent inductance formed through a conductive element of a certain length, such as the equivalent inductance formed by a conductor due to curling or rotation.

[0149] A radiator, or antenna stub, is a device in an antenna used to receive / transmit electromagnetic wave radiation. In some cases, the term "antenna" is narrowly defined as a radiator, which converts guided wave energy from the transmitter into radio waves, or converts radio waves into guided wave energy, for radiating and receiving radio waves. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to the transmitting radiator via a feed line, where it is converted into electromagnetic wave energy of a specific polarization and radiated in the desired direction. The receiving radiator converts electromagnetic wave energy of a specific polarization from a specific direction in space back into modulated high-frequency current energy, which is then transmitted to the receiver input via a feed line.

[0150] Radiators (or antenna stubs) may include conductors with specific shapes and sizes, such as wires or sheets, and this application does not limit the specific shape. In one embodiment, a wire radiator may be simply referred to as a wire antenna. In one embodiment, a wire radiator may be implemented by a conductive frame, and may also be referred to as a frame antenna. In one embodiment, a wire radiator may be implemented by a support conductor, and may also be referred to as a support antenna. In one embodiment, the wire diameter (e.g., including thickness and width) of the wire radiator, or the radiator of the wire antenna, is much smaller than the wavelength (e.g., the wavelength of the medium) (e.g., less than 1 / 16 of the wavelength), and the length may be comparable to the wavelength (e.g., the wavelength of the medium) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, and inverted F antennas (also known as IFAs). For example, in a dipole antenna, each dipole antenna typically includes two radiating stubs, each fed from the feed end of the radiating stub by a feed section. For example, an inverted-F antenna (IFA) can be considered as a monopole antenna with an added ground path. An IFA antenna has one feed point and one ground point, and is called an inverted-F antenna because its side view is inverted-F shaped. In one embodiment, the sheet radiator may include a microstrip antenna or a patch antenna, such as a planar inverted-F antenna (also known as a PIFA). In one embodiment, the sheet radiator may be implemented using a planar conductor (e.g., a conductive sheet or conductive coating). In one embodiment, the sheet radiator may include a conductive sheet, such as a copper sheet. In one embodiment, the sheet radiator may include a conductive coating, such as silver paste. The shape of the sheet radiator includes circular, rectangular, and annular shapes, and this application does not limit the specific shape. The structure of a microstrip antenna generally consists of a dielectric substrate, a radiator, and a ground plane, wherein the dielectric substrate is disposed between the radiator and the ground plane.

[0151] Radiators (or antenna stubs) may also include slots or gaps formed on a conductor, for example, closed or semi-closed slots or gaps formed on a grounded conductor surface. In one embodiment, a slotted or slit radiator may be simply referred to as a slot antenna or a gap antenna. In one embodiment, the radial dimension (e.g., including width) of the slot or gap of the slot antenna / gap antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), while the length dimension may be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, a radiator with a closed slot or gap may be simply referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or gap (e.g., an opening added to a closed slot or gap) may be simply referred to as an open slot antenna. In some embodiments, the gap shape is elongated. In some embodiments, the length of the gap is approximately half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the gap is approximately an integer multiple of a wavelength (e.g., one dielectric wavelength). In some embodiments, the slot can be fed by transmission lines connected across one or both sides, thereby exciting a radio frequency electromagnetic field on the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a conductive frame grounded at both ends, also known as a frame antenna; in this embodiment, the slot antenna or gap antenna can be viewed as including a linear radiator, the linear radiator being spaced apart from the ground and grounded at both ends, thereby forming a closed or semi-closed slot or gap. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a support conductor grounded at both ends, also known as a support antenna.

[0152] A feed circuit / feed structure is the combination of all components of an antenna used for receiving and transmitting radio frequency (RF) waves. In the case of a receiving antenna, the feed circuit can be considered the antenna section from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed circuit can be seen as the section after the last power amplifier. In some cases, the term "feed circuit" is narrowly interpreted as the RF chip, or the transmission path including the RF chip to the feed point on the radiator or transmission line. The feed circuit has the function of converting radio waves into electrical signals and sending them to the receiver components. Typically, it is considered part of the antenna used to convert radio waves into electrical signals and vice versa. Antenna design should consider the maximum power transfer possibility and efficiency. For this purpose, the antenna feed impedance must be matched with the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure maximum power transfer conditions, the two impedances (load resistance and feed impedance) should be matched. Matching can be achieved by considering frequency requirements and antenna design parameters such as gain, directivity, and radiation efficiency.

[0153] A feed line, also called a transmission line, is the connection line between the antenna transceiver and the radiator. Transmission lines can transmit current waves or electromagnetic waves directly, depending on the frequency and type. The connection point on the radiator where the transmission line connects is usually called the feed point. Transmission lines include conductive transmission lines, coaxial transmission lines, waveguides, and microstrip lines. Depending on their implementation, transmission lines can be mounted on a support antenna or a glass antenna. Depending on the carrier, transmission lines can be made of LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board).

[0154] Ground / Plug, broadly speaking, refers to at least a portion of any grounding layer, ground plane, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of the aforementioned grounding layers, ground planes, or grounding components. "Ground / Plug" can be used for grounding components within an electronic device. In one embodiment, "Ground / Plug" may include any one or more of the following: a grounding layer of a circuit board of an electronic device, a ground plane formed by the frame of the electronic device, a grounding metal layer formed by a thin metal film beneath the screen, a conductive grounding layer of a battery, and conductive or metallic components electrically connected to the aforementioned grounding layer / ground plane / metal layer. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or components separated and electrically insulated by dielectric or insulating layers such as fiberglass or polymers. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, the trace layer and the grounding layer being electrically connected through vias. In one embodiment, components such as display 120, touch screen, input buttons, transmitter, processor, memory, battery 140, charging circuit, system-on-chip (SoC) architecture, etc., may be mounted on or connected to the circuit board; or electrically connected to the trace layers and / or ground layers in the circuit board. For example, an RF source is disposed on a trace layer.

[0155] Any of the aforementioned grounding layers, ground planes, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material may be any of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate and tin-plated copper, graphite-impregnated cloth, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. Those skilled in the art will understand that grounding layers / ground planes / grounding metal layers may also be made of other conductive materials.

[0156] Grounding: refers to coupling with the aforementioned ground / floor in any way. In one embodiment, grounding can be achieved through physical grounding, such as through a structural component of the mid-frame to achieve a physical ground at a specific location on the frame (or, physical ground). In another embodiment, grounding can be achieved through device grounding, such as through devices like capacitors / inductors / resistors connected in series or parallel (or, device ground).

[0157] Resonant frequency: The resonant frequency is also called the resonance frequency. The resonant frequency can have a frequency range, that is, the frequency range in which resonance occurs. The resonant frequency can be a frequency range where the return loss characteristic is less than -6dB. The frequency corresponding to the strongest resonance is the center frequency. The return loss characteristic of the center frequency can be less than -20dB.

[0158] Resonant frequency band: The range of resonant frequencies is the resonant frequency band. The return loss characteristics at any frequency point within the resonant frequency band can be less than -6dB or -5dB.

[0159] Communication / Operating Frequency Band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna supporting the B40 band operates within the frequency range of 2300MHz to 2400MHz, or in other words, its operating frequency band includes the B40 band. The frequency range that meets the specifications can be considered the antenna's operating frequency band. The width of the operating frequency band is called the operating bandwidth. The operating bandwidth of an omnidirectional antenna may reach 3-5% of the center frequency. The operating bandwidth of a directional antenna may reach 5-10% of the center frequency. Bandwidth can be considered as a frequency range on both sides of the center frequency (e.g., the resonant frequency of a dipole), where the antenna characteristics are within the acceptable range of the center frequency.

[0160] The resonant frequency band and the operating frequency band can be the same or can partially overlap. In one embodiment, one or more resonant frequency bands of the antenna can cover one or more operating frequency bands of the antenna.

[0161] Electrical length: Electrical length can be expressed as the ratio of physical length (i.e., mechanical length or geometric length) multiplied by the time it takes for an electrical or electromagnetic signal to travel in a medium to the time required for that signal to travel a distance in free space equal to the physical length of the medium. Electrical length can be expressed by the following formula:

[0162]

[0163] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0164] Alternatively, electrical length can also refer to the ratio of physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, and electrical length can satisfy the following formula:

[0165]

[0166] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0167] In some embodiments of this application, the physical length of the radiator can be understood as within ±20%, ±10%, or ±5% of the electrical length of the radiator.

[0168] In the embodiments of this application, the wavelength in a certain wavelength mode of the antenna (such as a half-wavelength mode) can refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of a suspended metal antenna can generate resonance in the 1.575 GHz band, where the wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna in the 1.575 GHz band.

[0169] Wavelength: or operating wavelength, can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (resonant frequency from 1920MHz to 1980MHz) is 1955MHz, then the operating wavelength can be the wavelength calculated using this frequency. Not limited to the center frequency, "operating wavelength" can also refer to the wavelength corresponding to the non-center frequency of the resonant frequency or operating frequency band.

[0170] It should be understood that the wavelength of the radiation signal in air can be calculated as follows: (air wavelength, or vacuum wavelength) = speed of light / frequency, where the frequency is the frequency of the radiation signal (MHz), and the speed of light can be taken as 3 × 10⁻⁶. 8 m / s. The wavelength of the radiated signal in the medium can be calculated as follows: Where ε is the relative permittivity of the medium. The wavelength in the embodiments of this application typically refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonant frequency, or the medium wavelength corresponding to the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (resonant frequency of 1920MHz to 1980MHz) is 1955MHz, then the wavelength can be the medium wavelength calculated using this frequency. Not limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to the non-center frequency of the resonant frequency or operating frequency band. For ease of understanding, the medium wavelength mentioned in the embodiments of this application can be simply calculated using the relative permittivity of the medium filling one or more sides of the radiator.

[0171] End / Point: The term "end / point" in the context of the antenna radiator's first end / second end / feed end / ground end / feed point / ground point / connection point should not be narrowly interpreted as necessarily an endpoint or end physically disconnected from other radiators. It can also be considered a point or segment on a continuous radiator. In one embodiment, "end / point" can include a connection / coupling region on the antenna radiator that couples to other conductive structures. For example, a feed end / feed point can be a coupling region on the antenna radiator that couples to a feed structure or feed circuit (e.g., a region facing a part of the feed circuit). Similarly, a ground end / ground point can be a connection / coupling region on the antenna radiator that couples to a ground structure or ground circuit.

[0172] Open terminal, closed terminal: In some embodiments, open terminal and closed terminal are, for example, relative to whether or not they are grounded; the closed terminal is grounded, and the open terminal is not grounded. In some embodiments, open terminal and closed terminal are, for example, relative to other conductors; the closed terminal is electrically connected to other conductors, and the open terminal is not electrically connected to other conductors. In one embodiment, the open terminal may also be referred to as a floating terminal, free terminal, open terminal, or open-circuit terminal. In one embodiment, the closed terminal may also be referred to as a ground terminal or short-circuit terminal. It should be understood that in some embodiments, other conductors can be coupled through the open terminal to transfer coupled energy (which can be understood as transferring current).

[0173] In some embodiments, the understanding of "closed end" can also be from the perspective of current distribution. A closed end or ground end can be understood as a point of high current or low electric field on a radiator. In one embodiment, coupling electronic devices (e.g., capacitors, inductors, etc.) through a closed end can maintain the current distribution characteristics of the point of high current / low electric field. In one embodiment, opening a slit at or near the closed end (e.g., filling the slit with insulating material) can maintain the current distribution characteristics of the point of high current / low electric field.

[0174] In some embodiments, the understanding of "open terminal" can also be from the perspective of current distribution. An open terminal or a floating terminal can be understood as a point with a small current or a point with a large electric field on the radiator. In one embodiment, coupling electronic devices (e.g., capacitors, inductors, etc.) through an open terminal can maintain the current distribution characteristics of the point with a small current or a large electric field.

[0175] It should be understood that when an electronic device (e.g., capacitor, inductor, etc.) is coupled at the radiator end of a gap (which, from the perspective of the radiator's structure, is similar to the radiator at the opening of an open or floating end), the radiator end can be a point with a large current / small electric field. In this case, it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0176] The terms "middle" or "middle position" used in the embodiments of this application refer to specific ranges or distances. For example, the middle (position) of a conductor can refer to a section of the conductor including its midpoint, or a section of the conductor including its midpoint that is one-eighth of a wavelength. The wavelength can be the wavelength corresponding to the antenna's operating frequency band, the wavelength corresponding to the center frequency of the operating frequency band, or the wavelength corresponding to the resonant point. As another example, the middle (position) of a conductor can refer to a section of the conductor located less than a predetermined threshold (e.g., 1 mm, 2 mm, or 2.5 mm) from the midpoint. The middle position of a slot or the middle position of one side of a slot refers to the middle position of one side of the slot.

[0177] The terms collinearity, coaxiality, coplanarity, symmetry (e.g., axial symmetry, or central symmetry), parallelism, perpendicularity, and similarity (e.g., same length, same width, etc.) mentioned in the embodiments of this application are all relative to the current technological level, and not absolute and strict mathematical definitions. There may be a deviation of less than a predetermined threshold (e.g., 1 mm, 0.5 mm, or 0.1 mm) between the edges of two collinear radiating stubs or two antenna elements in the line width direction. There may be a deviation of less than a predetermined threshold between the edges of two coplanar radiating stubs or two antenna elements in the direction perpendicular to their coplanar plane. There may be a deviation of a predetermined angle between two parallel or perpendicular antenna elements. In one embodiment, the predetermined threshold may be less than or equal to a threshold of 1 mm, for example, the predetermined threshold may be 0.5 mm or 0.1 mm. In one embodiment, the predetermined angle may be an angle within the range of ±10°, for example, the predetermined angle deviation is ±5°.

[0178] The current unidirectional / reverse distribution mentioned in the embodiments of this application should be understood as the main currents on conductors on the same side being in the same / reverse direction. For example, when a unidirectional current is excited on a bent or looped conductor (e.g., the current path is also bent or looped), it should be understood that, for example, the main currents excited on the conductors on both sides of a looped conductor (e.g., on the conductors on both sides of a gap) are in opposite directions, but still fall under the definition of unidirectional current in this application. In one embodiment, unidirectional current on a conductor can mean that the current on that conductor has no reversal point. In one embodiment, reversible current on a conductor can mean that the current on that conductor has at least one reversal point. In one embodiment, unidirectional current on two conductors can mean that the currents on both conductors have no reversal points and flow in the same direction. In one embodiment, reversible current on two conductors can mean that the currents on both conductors have no reversal points and flow in opposite directions. The unidirectional / reverse current on multiple conductors can be understood accordingly.

[0179] Antenna radiation pattern: also known as radiation pattern. It refers to the graph showing how the relative field strength (normalized modulus) of the antenna's radiated field changes with direction at a certain distance from the antenna. It is usually represented by two mutually perpendicular planar radiation patterns passing through the direction of maximum radiation of the antenna.

[0180] Antenna radiation patterns typically have multiple radiating beams. The beam with the highest radiating intensity is called the main lobe, and the remaining beams are called side lobes. Among the side lobes, the side lobe in the opposite direction to the main lobe is also called the back lobe.

[0181] Beamwidth: Divided into horizontal beamwidth and vertical beamwidth. Horizontal beamwidth refers to the angle between two directions on either side of the direction of maximum radiation, where the radiated power decreases by 3dB. Vertical beamwidth refers to the angle between two directions on either side of the direction of maximum radiation, where the radiated power decreases by 3dB.

[0182] Antenna gain: Characterizes the degree to which an antenna concentrates the radiated input power. Generally, the narrower the main lobe and the smaller the side lobes of the antenna pattern, the higher the antenna gain.

[0183] System efficiency: refers to the ratio of the power radiated into space by the antenna (i.e., the power effectively converted into electromagnetic waves) to the antenna's input power. System efficiency is the actual efficiency after considering antenna port matching; that is, the system efficiency of an antenna is its actual efficiency (i.e., overall efficiency).

[0184] Radiation efficiency refers to the ratio of the power radiated by an antenna into space (i.e., the power effectively converted into electromagnetic waves) to the active power input to the antenna. The active power input to the antenna equals the antenna's input power minus the power loss. Power loss mainly includes return loss power, ohmic loss power of the metal, and / or dielectric loss power. Both metal loss and dielectric loss are factors affecting radiation efficiency.

[0185] Those skilled in the art will understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0dB, the better the efficiency of the antenna.

[0186] dB: This stands for decibel, a logarithmic concept with base 10. Decibels are used to evaluate the proportional relationship between two physical quantities; they themselves have no physical dimensions. For every 10-fold increase in the ratio between two quantities, their difference can be expressed as 10 decibels. For example: A = 100, B = 10, C = 5, D = 1, then A / D = 20 dB; B / D = 10 dB; C / D = 7 dB; B / C = 3 dB. In other words, a 10-decibel difference between two quantities is a 10-fold difference, a 20-decibel difference is a 100-fold difference, and so on. A 3-decibel difference is a 2-fold difference between the two quantities.

[0187] dBi: Usually mentioned together with dBd. dBi and dBd are units of power gain, both relative values, but with different reference points. The reference point for dBi is an omnidirectional antenna; the reference point for dBd is a dipole. Generally, dBi and dBd are considered to represent the same gain, but the value expressed in dBi is 2.15 dBi larger than that expressed in dBd. For example, for an antenna with a gain of 16 dBd, its gain converted to dBi is 18.15 dBi, generally ignoring the decimal places, hence 18 dBi.

[0188] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port after passing through the antenna circuit to the transmit power at the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the higher the antenna's radiation efficiency. Conversely, the larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the antenna's radiation efficiency.

[0189] Antenna return loss can be represented by the S11 parameter, which is one of the S-parameters. S11 represents the reflection coefficient, and this parameter characterizes the antenna's transmission efficiency.

[0190] In one embodiment, the S11 diagram can be understood as a schematic diagram representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram within the range of -6dB can be understood as the resonant frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the less energy reflected back by the antenna itself, which means more energy actually enters the antenna, and the higher the system efficiency of the antenna. The larger the S11 parameter, the greater the antenna return loss, and the lower the system efficiency of the antenna.

[0191] It should be noted that in engineering, an S11 value of -6dB is generally used as the standard. When the S11 value of an antenna is less than -6dB, it can be considered that the antenna can work normally or that the antenna has good transmission efficiency.

[0192] The Smith chart is a calculation graph plotted on a reflective plane, showing a family of circles representing the normalized input impedance (or admittance). The Smith chart is primarily used for impedance matching of transmission lines. The circular lines in the chart represent the real values ​​of reactance, i.e., resistance. The horizontal line in the middle and the lines radiating upwards and downwards represent the imaginary values ​​of resistance, i.e., the resistance generated by capacitors or inductors at high frequencies; upwards are positive, and downwards are negative. The point at the very center of the chart (1+j0) represents an impedance-matched resistance value, and its reflection coefficient will be zero. The edges of the chart represent a reflection coefficient length of 1, i.e., 100% reflection. The numbers on the edges represent the angle (0-180 degrees) and wavelength (from zero to half a wavelength) of the reflection coefficient.

[0193] This application provides an electronic device, which may include devices such as mobile phones, tablets, laptops, and remote information processors; the electronic device includes an antenna assembly (antenna), which enables wireless communication between the electronic device and communication base stations, other electronic devices, satellites, etc.

[0194] Please refer to Figure 1 In the implementation of the electronic device 10, including a mobile phone, the mobile phone includes a mid-frame 11, a display panel 12, and a motherboard 13. The mid-frame 11 includes a mid-plate 14 and a frame 15 surrounding the mid-plate 14. The frame 15 forms a mounting cavity. The motherboard 13 is disposed within the mounting cavity. The display panel 12 covers the frame 15 to close the mounting cavity. The display panel 12 is electrically connected to the motherboard 13 so that the motherboard 13 controls the display panel 12 to display images. An antenna assembly can be disposed on the frame 15. For example, the antenna assembly can be an integral structure with the frame 15, that is, part of the frame 15 serves as the antenna assembly. Of course, the antenna assembly can also be mounted on the frame 15 by means of patch, bolt connection, etc. This application embodiment does not limit this.

[0195] In this embodiment, the electronic device 10 further includes a radio frequency (RF) device coupled to an antenna assembly. The RF device can feed RF signals to the antenna assembly, enabling the antenna assembly to transmit signals to the outside world. For example, the RF device may include a device capable of emitting RF signals, such as an RF chip. In an implementation where the electronic device 10 includes a mobile phone, the RF device may be mounted on the motherboard 13.

[0196] Please refer to Figure 2 The antenna assembly in this embodiment includes a floor 120 and a radiator 110 disposed on the floor 120. The radiator 110 may be located at one end of the floor 120. Figure 2(The upper part in the indicated orientation), the floor 120 is used to assist the radiator 110 in emitting signals. Exemplarily, in an implementation where the electronic device 10 includes a mobile phone, the floor 120 may include a middle plate 14 (such as...). Figure 1 (as shown), or the ground 120 includes a grounding layer on the motherboard 13, or the ground 120 includes a grounding layer on the display panel 12; of course, the ground 120 can also be other grounding structures, and the embodiments of this application do not limit the ground 120.

[0197] Understandably, antenna assemblies can be categorized into slot antennas and wire antennas based on the structure of the radiator, such as... Figure 2 As shown, in an embodiment where the antenna assembly is a slot antenna, a first gap 113 exists between the radiator 110 and the ground plane 120. The first gap 113 can be filled with a material having a certain dielectric constant; alternatively, it can be left unfilled, i.e., the first gap 113 can be filled with air. Along the extension direction of the radiator 110, both ends of the radiator 110 are grounded. For example, both ends of the radiator 110 can be coupled to the ground plane 120, so that both ends of the radiator 110 are grounded. The extension direction of the radiator 110 can be its length direction. Figure 2 Taking the orientation shown as an example, the extension direction of the radiator 110 is approximately horizontal. A second gap 114 is provided on the radiator 110, communicating with the first gap 113. The second gap 114 is perpendicular to the extension direction of the radiator 110. Figure 2 The radiator 110 is cut off in the vertical direction shown in the diagram.

[0198] In this embodiment, the antenna assembly further includes a matching circuit 130. A feed point b is provided on the radiator 110. The matching circuit 130 is coupled to both the feed point b and the radio frequency device. The matching circuit 130 can feed the radio frequency signal from the radio frequency device into the radiator 110. The matching circuit 130 may include a capacitor and / or an inductor. The matching circuit 130 causes the antenna assembly to generate a first resonance and a second resonance, wherein the resonant frequency of the first resonance is lower than the resonant frequency of the second resonance.

[0199] Continue to refer to Figure 2 In this embodiment, the antenna assembly further includes a slot capacitor 115. The radiators 110 at both ends of the second slot 114 are coupled through the slot capacitor 115. The slot capacitor 115 can adjust the resonant frequency of the first resonance and the resonant frequency of the second resonance, such that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz. The resonant frequency of the first resonance covers the first communication frequency band, and the resonant frequency of the second resonance covers the second communication frequency band. Within both the first and second communication frequency bands, the antenna assembly can perform normal wireless communication.

[0200] In some implementations, the length of the radiator 110 along its extension direction can be approximately half the wavelength corresponding to the resonant frequency of the second resonance. This configuration reduces the length of the radiator 110 while still ensuring the second resonance meets high-frequency requirements. Simultaneously, the resonant frequency of the first resonance can be adjusted via the slot capacitor 115 so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0201] It is understood that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz, allowing the first and second communication frequency bands to cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. For example, the first communication frequency band can cover the WiFi frequency band, and the second communication frequency band can cover the cellular communication frequency band; or, the first communication frequency band can cover the Bluetooth frequency band, and the second communication frequency band can cover the cellular communication frequency band. This application embodiment does not limit the two communication frequency bands covered by the antenna assembly.

[0202] In the above implementation, the gap capacitor 115 can be a distributed capacitor. For example, the gap capacitor 115 can include a portion of the radiator 110 at one end of the second gap 114, a portion of the radiator 110 at the other end of the second gap 114, and the equivalent capacitance formed by the second gap 114. Of course, the gap capacitor 115 can also be a lumped capacitor. For example, the gap capacitor 115 can include a capacitor element, which can be disposed on the motherboard 13 (e.g., ...). Figure 1 As shown in the figure, the capacitor can also be placed between the main board 13 and the radiator 110.

[0203] For example, when the difference between the resonant frequencies of the first and second resonances is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the slot capacitor 115 is less than or equal to 2 pF; when the difference between the resonant frequencies of the first and second resonances is less than 1.5 GHz, the capacitance value of the slot capacitor 115 is less than or equal to 5 pF. This configuration ensures that the difference between the resonant frequencies of the first and second resonances is less than 2 GHz, while avoiding an excessively large or small capacitance value for the slot capacitor 115. Of course, the slot capacitor 115 can also be used for impedance matching of the antenna assembly.

[0204] In some embodiments, the first resonance includes a first sub-resonance and a second sub-resonance (dual resonance), and correspondingly, the second resonance can be a single resonance; that is, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance together cover the first communication frequency band, thereby increasing the bandwidth of the first resonance and further improving the bandwidth of the antenna assembly.

[0205] It is understandable that the resonant frequency of the first resonance can be the center frequency of the first sub-resonance and the second sub-resonance, which is the frequency corresponding to the midpoint between the center frequencies of the first sub-resonance and the second sub-resonance.

[0206] Continue to refer to Figure 2 In the above embodiment, the radiator 110 includes a midpoint a in its extending direction, and along the extending direction of the radiator 110, the radiator 110 includes a first end ( Figure 2 The left end of the indicated orientation) and the second end ( Figure 2 (The right end of the indicated orientation), both the first end and the second end are grounding ends. The second gap 114 can be set near the midpoint a, and correspondingly, the feed point b can be set between the midpoint a and the first end; or the second gap 114 is set between the midpoint a and the first end, and the feed point b is set between the midpoint a and the first end; or the second gap 114 is set between the midpoint a and the second end, and correspondingly, the feed point b can be set between the midpoint a and the first end, or the feed point b can be set between the midpoint a and the second end.

[0207] Please refer to Figure 3 In the above implementation, the matching circuit 130 includes a first sub-matching circuit 131, which includes a first inductor L1 and a first capacitor C1 connected in series. One end of the first capacitor C1 is coupled to the feed point b, and the other end of the first capacitor C1 is coupled to one end of the first inductor L1. The other end of the first inductor L1 can be coupled to a radio frequency device to receive radio frequency signals. Alternatively, one end of the first inductor L1 is coupled to the feed point b, and the other end of the first inductor L1 is coupled to one end of the first capacitor C1. The other end of the first capacitor C1 is coupled to a radio frequency device to receive radio frequency signals.

[0208] In some implementations, the resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator, or the resonant frequency of the second sub-resonator is less than the resonant frequency of the first sub-resonator. This application does not impose such limitations. This application will use the example of the second sub-resonator having a resonant frequency greater than the resonant frequency of the first sub-resonator for illustration.

[0209] Continue to refer to Figure 2In the above embodiment, under the first sub-resonance and the second sub-resonance, the current direction on the radiator 110 is the same; under the second resonance, the radiator 110 has a first small current point c, and the current directions on the radiators 110 on both sides of the first small current point c are opposite. With this configuration, under the first sub-resonance and the second sub-resonance, the antenna assembly operates in the same mode, both being common mode (CM mode); under the second resonance, the antenna assembly operates in differential mode (DM mode). It can be understood that the first small current point c can be a position where the current on the radiator 110 is close to zero.

[0210] like Figure 3 As shown, the second gap 114 is located near the midpoint a of the radiator 110, the feed point b is located between the midpoint a and the first end, the first sub-matching circuit 131 includes a first capacitor C1, a first inductor L1 and a first matching inductor L11, the first capacitor C1 and the first inductor L1 are connected in series, one end of the first matching inductor L11 is coupled to the end of the first capacitor C1 away from the feed point b, and the other end of the first matching inductor L11 is grounded; wherein the capacitance value of the first capacitor C1 is 0.7 pH, the inductance value of the first inductor L1 is 7 nH, the inductance value of the first matching inductor L11 is 80 nH, the capacitance value of the gap capacitor 115 is 0.45 pH, and the length of the radiator 110 is 20 mm.

[0211] Please refer to Figure 4 Curve M1 in the figure is Figure 3 The return loss curve corresponding to the antenna assembly is shown; M2 is... Figure 3 The antenna assembly shown does not have the return loss curve corresponding to the first sub-matching circuit 131, meaning that feed point b directly receives the RF signal from the RF device. Please refer to... Figure 5 In the figure, Y1 is Figure 3 The impedance circle diagram of the antenna assembly is shown, where Y2 is... Figure 3 The impedance circle diagram for the antenna assembly shown is not provided for the first sub-matching circuit 131. Figure 4 and Figure 5 It can be seen that, Figure 3 The antenna assembly shown can generate a first sub-resonance, a second sub-resonance, and a second resonance; wherein the resonant frequency of the first resonance is about 1.75 GHz, the resonant frequency of the second sub-resonance is about 2.1 GHz, and the resonant frequency of the second resonance can be about 4.4 GHz. Figure 6 It shows Figure 3 The current distribution of the antenna assembly shown is under the first sub-resonance, the second sub-resonance, and the third sub-resonance; by Figure 6 It can be seen that under the first and second sub-resonances, the current on the radiator 110 is a unidirectional current, and the antenna assembly is in CM mode (e.g., Figure 5The first sub-resonant CM1 and the second sub-resonant CM2 are in the second resonance. Under the second resonance, the current direction on the radiator 110 is opposite, and the antenna assembly is in DM mode.

[0212] Please refer to Figure 7 , Figure 7 The middle curve K1 is Figure 3 The antenna efficiency curve corresponding to the antenna assembly is shown; K2 is... Figure 3 The antenna assembly shown does not have the antenna efficiency curve corresponding to the first sub-matching circuit 131, meaning that feed point b directly receives the RF signal from the RF device. Figure 7 It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0213] In this embodiment, by adjusting the position of the feed point b, the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator can be adjusted. Figure 8 for Figure 3 The diagram shows the structure of the antenna assembly after the feed point b is moved 3mm towards the first end (left end). Figure 9 for Figure 3 The diagram shows the structure of the antenna assembly after the feed point b is moved 2mm towards the second end (right end). Please refer to... Figure 10 , Figure 10 In the middle, M1 is Figure 3 The return loss curve of the antenna assembly is shown, where M2 is... Figure 9 The return loss curve of the antenna assembly shown is M3. Figure 8 The return loss curve of the antenna assembly is shown. Figure 11 Y1-Y3 are respectively Figure 3 , Figure 9 , Figure 8 The impedance circle diagram of the antenna assembly shown is derived from... Figure 10 and Figure 11 It can be seen that as the distance between the feed point b and the first end shortens, the difference between the resonant frequencies of the first sub-resonator and the second sub-resonator decreases, and the impedance circle diagram shrinks; as the distance between the feed point b and the first end increases, the difference between the resonant frequencies of the first sub-resonator and the second sub-resonator increases, and the impedance circle diagram diverges. Figure 12 K1-K3 are respectively Figure 3 , Figure 9 , Figure 8 The antenna efficiency curve of the antenna assembly shown is derived from... Figure 12 It can be seen that as the feed point b moves, the antenna assembly has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0214] In some implementations, the distance between the feed point b and the first end is less than or equal to one-third of the length of the radiator 110, so that the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is less than or equal to 150MHz. This arrangement allows the first and second sub-resonators to be close to each other, thereby ensuring communication quality within the communication frequency band corresponding to the first resonator; on the other hand, it also allows the resonant frequencies of both the first and second sub-resonators to be located within their respective communication frequency bands.

[0215] In this embodiment of the application, by adjusting the position of the second gap 114, the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator, as well as the difference between the resonant frequency of the first resonator and the resonant frequency of the second resonator, can be adjusted. Figure 13 This is a schematic diagram of the structure of the second slot 114 in the antenna assembly after it has been moved 4mm from the midpoint a towards the first end. Figure 14 This is a schematic diagram of the structure of the second slot 114 in the antenna assembly after it has been moved 4mm from the midpoint a towards the second end. Please refer to... Figure 15 , Figure 15 In the diagram, M1 represents the return loss curve of the second slot 114 located near the midpoint a, and M2 represents... Figure 12 The return loss curve of the antenna assembly shown is M3. Figure 13 Please refer to the return loss curve of the antenna assembly shown. Figure 16 , Figure 16 Y1 is the impedance circle diagram of the second gap 114 located near the midpoint a, and Y2 is... Figure 12 The impedance circle diagram of the antenna assembly is shown, where Y3 is... Figure 13 The impedance circle diagram of the antenna assembly is shown. Figure 15 and Figure 16 It can be seen that as the distance between the second slit 114 and the first end shortens, the circle diagram of the first resonance shrinks, and the difference between the resonant frequencies of the first and second sub-resonators decreases accordingly. The circle diagram of the second resonance does not change significantly, and the resonant frequencies of the first and second resonances remain essentially unchanged. As the distance between the second slit 114 and the first end increases, the circle diagram of the first resonance diverges, the difference between the resonant frequencies of the first and second sub-resonators increases accordingly, the circle diagram of the first resonance shrinks, and the difference between the resonant frequencies of the first and second resonances decreases. Figure 17 K1-K3 represent the antenna efficiency curves for the second slot 114 being located near the midpoint a, the second slot 114 being moved 4mm from the midpoint a towards the first end, and the second slot 114 being moved 4mm from the midpoint a towards the second end, respectively. Figure 17 It can be seen that as the second slot 114 moves, the antenna assembly has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0216] In some implementations, the distance between the second slit 114 and the midpoint a is less than or equal to one-quarter of the length of the radiator 110. For example, the feed point b and the second slit 114 can both be located between the midpoint a and the first end, and the distance between the second slit 114 and the midpoint a is less than or equal to one-quarter of the length of the radiator 110; or, the feed point b is located between the midpoint a and the first end, the second slit 114 is located between the midpoint a and the second end, and the distance between the second slit 114 and the midpoint a is less than or equal to one-quarter of the length of the radiator 110. This arrangement ensures that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is moderate.

[0217] Please refer to Figure 18 , Figure 18 for Figure 3 The diagram shows the return loss of the antenna assembly at different slot capacitance values ​​of 115. Figure 18 In the diagram, M1 is the return loss curve without the slot capacitor 115, and M2-M5 are the return loss curves with the slot capacitor 115 set to 0.25pF, 0.45pF, 0.65pF, and 100pF, respectively. Figure 19 In the diagram, K1 represents the antenna efficiency curve without slot capacitor 115, and K2-K4 represent the antenna efficiency curves with slot capacitor 115 set to 0.25pF, 0.45pF, and 0.65pF, respectively. Figure 18 and Figure 19 It can be seen that as the gap capacitance 115 gradually decreases, both the first and second sub-resonants shift to higher frequencies, while the second resonant remains essentially unchanged. Furthermore, from... Figure 19 It can be seen that when the gap capacitance 115 is not too large, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0218] In some embodiments, the first resonance is a single resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance (dual resonance). The resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance. The resonant frequency bands of the third and fourth sub-resonances together cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0219] It is understandable that the resonant frequency of the second resonance can be the center frequency of the third and fourth sub-resonances, which is the frequency corresponding to the midpoint between the center frequencies of the third and fourth sub-resonances.

[0220] Please refer to Figure 20 In the above embodiment, the feed point b is located on one side of the midpoint a, and the second gap 114 is located on the other side of the midpoint a. For example, the second gap 114 is disposed between the midpoint a and the second end of the radiator 110, and the feed point b is disposed between the midpoint a and the first end of the radiator 110.

[0221] Matching circuit 130 includes a second sub-matching circuit 132, which includes a second capacitor C2 and a second inductor L2. One end of the second inductor L2 is coupled to the feed point b, one end of the second capacitor C2 is connected to one end of the second inductor L2, the other end of the second capacitor C2 is grounded, and the other end of the second inductor L2 is configured to receive radio frequency signals so that the second resonance is a double resonance.

[0222] In the above embodiments, under the first resonance, the current directions on the radiator 110 are the same, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the radiator 110 has a first small current point c, and the current directions on the radiator 110 on both sides of the first small current point c are opposite, and the third and fourth sub-resonances are in the same mode, both being DM mode.

[0223] like Figure 20 As shown, the second sub-matching circuit 132 includes a second inductor L2, a second capacitor C2, and a second matching inductor L21. One end of the second matching inductor L21 is coupled to the feed point b, and the other end of the second matching inductor L21 is coupled to both the second capacitor C2 and one end of the second inductor L2. The other end of the second inductor L2 is used to receive radio frequency signals, and the other end of the second capacitor C2 is configured to be grounded. The inductance value of the second matching inductor L21 is 7.5nH, the capacitance value of the second capacitor C2 is 0.3pF, the inductance value of the second inductor L2 is 6nH, the capacitance value of the slot capacitor 115 is 0.45pF, and the length of the radiator 110 is 20mm. Figure 21 for Figure 20 The return loss diagram of the antenna assembly is shown. Figure 22 for Figure 20 The impedance circle diagram of the antenna assembly is shown; from Figure 21 and Figure 22 It can be seen that the resonant frequency of the first sub-resonator of the antenna assembly is about 1.85 GHz, the resonant frequency of the third sub-resonator is about 4.3 GHz, and the resonant frequency of the fourth sub-resonator is about 4.7 GHz. Figure 23 for Figure 20 The antenna efficiency diagram of the antenna assembly shown is derived from... Figure 23 It can be seen that the antenna assembly has high antenna efficiency under the first resonance, the third sub-resonance, and the fourth sub-resonance, which gives the antenna assembly good communication performance.

[0224] Figure 24 for Figure 20 The current distribution diagrams of the antenna assembly shown are for the first resonance, the third sub-resonance, and the fourth sub-resonance. Figure 24It can be seen that under the first resonance, the current directions on the radiator 110 are the same, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the radiator 110 has a first small current point c, and the current directions on the radiator 110 on both sides of the first small current point c are opposite, and the antenna assembly is in DM mode (e.g., Figure 22 (In the third sub-resonance DM1 and the fourth sub-resonance DM2).

[0225] In the above embodiment, the difference between the resonant frequencies of the third and fourth sub-resonators can be adjusted by adjusting the position of the feed point b. For example, the distance between the feed point b and the first end is less than or equal to one-third of the length of the radiator 110, so that the difference between the resonant frequencies of the third and fourth sub-resonators is less than or equal to 500MHz. This arrangement allows the third and fourth sub-resonators to be close to each other, thereby ensuring communication quality within the communication band corresponding to the second resonator; on the other hand, it also ensures that the resonant frequencies of both the third and fourth sub-resonators are within their respective communication bands.

[0226] In some embodiments, both the first and second resonances are dual resonances; that is, the first resonance includes a first sub-resonant and a second sub-resonant, and the second resonance includes a third sub-resonant and a fourth sub-resonant. The first and second sub-resonants together cover a first communication frequency band to increase the bandwidth of the first resonance, and the third and fourth sub-resonants together cover a second communication frequency band to increase the bandwidth of the second resonance. Through this arrangement, the bandwidth of the first and second resonances can be increased, further increasing the bandwidth of the antenna assembly.

[0227] Please refer to Figure 25 In the above implementation, the matching circuit 130 may include a first sub-matching circuit and a second sub-matching circuit. The second gap 114 is located between the midpoint a and the second end, and the feed point b is located between the first end and the midpoint a. The distance between the second gap 114 and the midpoint a is less than or equal to one-quarter of the length of the radiator 110, and the distance between the feed point b and the first end is less than or equal to one-third of the length of the radiator 110.

[0228] like Figure 26As shown, in the matching circuit 130, the first sub-matching circuit includes a first capacitor C1 and a first inductor L1, and the second sub-matching circuit includes a second capacitor C2, a second inductor L2 and a second matching inductor L21. One end of the first inductor L1 is coupled to the feed point b, and the other end of the first inductor L1 is coupled to one end of the first capacitor C1 through the second inductor L2. The other end of the first capacitor C1 is used to receive radio frequency signals. One end of the second capacitor C2 is coupled to the other end of the first inductor L1, and the other end of the second capacitor C2 is grounded. One end of the second matching inductor L21 is coupled to one end of the first capacitor C1, and the other end of the second matching inductor L21 is grounded. The capacitance of the first capacitor C1 is 0.7pF, the capacitance of the second capacitor C2 is 0.3pF, the inductance of the first inductor L1 is 5.5nH, the inductance of the second inductor L2 is 8.5nH, the inductance of the second matching inductor L21 is 20nH, the capacitance of the gap capacitor 115 is 0.45pF, and the length of the radiator 110 is 20mm.

[0229] Figure 27 for Figure 26 The return loss diagram of the antenna assembly is shown. Figure 28 for Figure 26 The impedance circle diagram of the antenna assembly is shown; from Figure 27 It can be seen that the resonant frequency of the first sub-resonator is about 1.7 GHz, the resonant frequency of the second sub-resonator is about 1.9 GHz, the resonant frequency of the third sub-resonator is about 4.4 GHz, and the resonant frequency of the fourth sub-resonator is about 4.8 GHz. Figure 29 for Figure 26 The antenna efficiency diagram of the antenna assembly shown is derived from... Figure 29 It can be seen that the antenna assembly has high antenna efficiency under the first sub-resonance, second sub-resonance, third sub-resonance and fourth sub-resonance, which makes the antenna assembly have good communication performance.

[0230] Figure 30 for Figure 26 The current distribution diagrams of the antenna assembly shown are for the first sub-resonance, second sub-resonance, third sub-resonance, and fourth sub-resonance. Figure 30 It can be seen that under the first sub-resonance, the current on the radiator 110 is in the same direction, that is, the mode of the antenna assembly is CM mode; under the second sub-resonance, the current on the radiator 110 is in the same direction, that is, the mode of the antenna assembly is CM mode; under the third sub-resonance, the radiator 110 has a first small current point c, and the currents on the radiators 110 on both sides of the first small current point c are in opposite directions, that is, the mode of the antenna assembly is DM mode; under the fourth sub-resonance, the radiator 110 has a first small current point c, and the currents on the radiators 110 on both sides of the first small current point c are in opposite directions, that is, the mode of the antenna assembly is DM mode.

[0231] Figure 31 This is a schematic diagram of the antenna assembly after moving the feed point b 3mm towards the second end. Please refer to... Figure 32 In the diagram, M1 is... Figure 26 The return loss curve of the antenna assembly when the feed point b is at the initial position, and M2 is the antenna assembly after the feed point b is moved 3mm from the initial position to the second end (e.g., Figure 31 The return loss curve (shown) is shown, where M3 is... Figure 26 The return loss curve of the antenna assembly after the feed point b is moved 6mm from its initial position to the second end. Please refer to... Figure 33 , Figure 33 K1 is Figure 26 The antenna efficiency curve of the antenna assembly when the feed point b is at the initial position, where K2 is... Figure 26 The antenna efficiency curve of the antenna assembly after the feed point b is moved 3mm from the initial position to the second end, where K3 is... Figure 26 The antenna efficiency curve of the antenna assembly after the feed point b is moved 6mm from its initial position towards the second end. Figures 31-33 It can be seen that as the feed point b moves towards the second end, the difference between the resonant frequencies of the first sub-resonator and the second sub-resonator gradually increases, and the difference between the resonant frequencies of the third sub-resonator and the fourth sub-resonator gradually increases. That is, the difference between the resonant frequencies of the first resonator and the second resonator gradually increases. After moving the feed point b towards the second end, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0232] Figure 34 This is a schematic diagram showing the structure after moving the second slot 114 of the antenna assembly 3mm from the midpoint a towards the second end. Please refer to... Figure 35 , Figure 35 In the diagram, M1 represents the return loss curve of the antenna assembly when the second slot 114 is in its initial position; M2 represents the return loss curve of the antenna assembly when the second slot 114 moves 3mm from its initial position towards the first end; M3 represents the return loss curve of the antenna assembly when the second slot 114 moves 6mm from its initial position towards the first end; and M4 represents the return loss curve of the antenna assembly when the second slot 114 moves 3mm from its initial position towards the second end (e.g., when the second slot 114 moves 3mm from its initial position towards the second end). Figure 34 (As shown) The return loss curve of the antenna assembly. Please refer to... Figure 36 , Figure 36 In the diagram, K1 represents the antenna efficiency curve of the antenna assembly when the second slot 114 is in its initial position; K2 represents the antenna efficiency curve of the antenna assembly when the second slot 114 moves 3mm from its initial position towards the first end; K3 represents the antenna efficiency curve of the antenna assembly when the second slot 114 moves 6mm from its initial position towards the first end; and K4 represents the antenna efficiency curve of the antenna assembly when the second slot 114 moves 3mm from its initial position towards the second end. Figures 34-36It can be seen that as the second slit 114 moves towards the first end, the difference in resonant frequencies between the first and second sub-resonators gradually decreases, while the difference in resonant frequencies between the third and fourth sub-resonators gradually increases; conversely, as the second slit 114 moves towards the second end, the difference in resonant frequencies between the first and second sub-resonators gradually increases, while the difference in resonant frequencies between the third and fourth sub-resonators gradually decreases. Furthermore, from... Figure 36 It can be seen that regardless of whether the second slit 114 moves towards the first end or towards the second end, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0233] Please refer to Figure 37 , Figure 37 In the middle, M1 is Figure 26 The return loss curves of the antenna components shown are M2-M4 respectively. Figure 26 The return loss curves of the radiator 110 between the second slot 114 and the first end of the antenna assembly are shown when it is lengthened by 1.5 mm, lengthened by 3 mm, and shortened by 1.5 mm. Figure 38 In the middle, K1 is Figure 26 The antenna efficiency curves of the antenna assembly shown are K2-K4 respectively. Figure 26 The antenna efficiency curves are shown for the radiator 110 between the second slot 114 and the first end of the antenna assembly, when lengthened by 1.5 mm, 3 mm, and shortened by 1.5 mm. Figure 37 and Figure 38 It can be seen that the length of the radiator 110 between the second slit 114 and the first end affects the first and third sub-resonators, while having a smaller impact on the second and fourth sub-resonators; as the length of the radiator 110 between the second slit 114 and the first end increases, the resonant frequencies of the first and third sub-resonators gradually shift to lower frequencies. Furthermore, due to... Figure 38 It can be seen that as the length of the radiator 110 between the second slot 114 and the first end changes, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0234] Please refer to Figure 39 , Figure 39 In the middle, M1 is Figure 26 The return loss curves of the antenna components shown are M2-M4 respectively. Figure 26 The return loss curves of the radiator 110 between the second slot 114 and the second end of the antenna assembly are shown as shortened by 1.5 mm, shortened by 3 mm, and lengthened by 1.5 mm. Figure 40 In the middle, K1 is Figure 26 The antenna efficiency curves of the antenna assembly shown are K2-K4 respectively. Figure 26 The antenna efficiency curves are shown for the radiator 110 between the second slot 114 and the second end of the antenna assembly, when shortened by 1.5 mm, shortened by 3 mm, and lengthened by 1.5 mm. (The last sentence appears to be incomplete and possibly refers to an antenna efficiency curve.) Figure 39and Figure 40 It can be seen that the length of the radiator 110 between the second slit 114 and the second end affects the second and fourth sub-resonators, while having a smaller impact on the first and third sub-resonators; as the length of the radiator 110 between the second slit 114 and the second end increases, the resonant frequencies of the second and fourth sub-resonators gradually shift to lower frequencies. Furthermore, due to... Figure 40 It can be seen that as the length of the radiator 110 between the second slot 114 and the second end changes, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0235] Please refer to Figure 41 , Figure 41 For the antenna assembly, the slot capacitance is 115 (e.g.) Figure 26 (As shown) Return loss diagrams at different times. Figure 41 In the diagram, M1 is the return loss curve without the slot capacitor 115, and M2-M5 are the return loss curves with the slot capacitor 115 set to 0.25pF, 0.45pF, 0.65pF, and 100pF, respectively. Figure 42 In the diagram, K1 represents the antenna efficiency curve without the slot capacitor 115, and K2-K5 represent the antenna efficiency curves with slot capacitors 115 of 0.25pF, 0.45pF, 0.65pF, and 100pF, respectively. Figure 41 and Figure 42 It can be seen that as the gap capacitance 115 gradually decreases, each sub-resonance shifts towards higher frequencies. Furthermore, from... Figure 42 It can be seen that when the gap capacitance 115 is not too large, the antenna assembly still has high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0236] Please refer to Figure 43 In some embodiments, both ends (left and right) of the radiator 110 along its extension direction are open ends, i.e., both the first end (left) and the second end (right) of the radiator 110 are open ends, and correspondingly, the antenna assembly is a wire antenna. The matching circuit 130 is coupled to a feed point b on the radiator 110 to feed a signal to the feed point b. The matching circuit 130 can cause the antenna assembly to generate a first resonance and a second resonance, the resonant frequency of the first resonance being lower than the resonant frequency of the second resonance.

[0237] In the above implementation, the antenna assembly also includes a grounding inductor 116, one end of which is coupled to a grounding point e on the radiator 110, and the other end of which is configured to be grounded. The grounding inductor 116 can also ensure that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0238] In some implementations, the length of the radiator 110 along its extension direction can be approximately half the wavelength corresponding to the resonant frequency of the second resonance. This configuration reduces the length of the radiator 110 while still ensuring the second resonance meets high-frequency requirements. Simultaneously, the first resonance can be adjusted via the grounding inductor 116 so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0239] It is understood that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz. The first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. For example, the first communication frequency band can cover the WiFi frequency band, and the second communication frequency band can cover the cellular communication frequency band; or the first communication frequency band can cover the Bluetooth frequency band, and the second communication frequency band can cover the cellular communication frequency band. This application embodiment does not limit the two communication frequency bands covered by the antenna assembly.

[0240] In the above implementation, the grounding inductor 116 can be a distributed inductor. For example, the grounding inductor 116 can include a conductor (such as a metal sheet, wire, etc.) with a certain degree of inductance located between the floor 120 and the radiator 110. Of course, the grounding inductor 116 can also be a lumped inductor. For example, the grounding inductor 116 can include an inductor device, which can be disposed on the motherboard 13, or it can be disposed between the motherboard 13 and the radiator 110.

[0241] For example, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the grounding inductor 116 is less than or equal to 3 nH; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the inductance value of the grounding inductor 116 is less than or equal to 5 nH. This ensures that the inductance value of the grounding inductor 116 is appropriate. Of course, the impedance matching of the antenna components can also be achieved through the grounding inductor 116.

[0242] In some embodiments, the first resonance includes a first sub-resonance and a second sub-resonance (dual resonance), and correspondingly, the second resonance can be a single resonance; that is, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance together cover the first communication frequency band, thereby increasing the bandwidth of the first resonance and further improving the bandwidth of the antenna assembly.

[0243] It is understandable that the resonant frequency of the first resonance can be the center frequency of the first sub-resonance and the second sub-resonance, which is the frequency corresponding to the midpoint between the resonant frequencies of the first and second sub-resonances.

[0244] In the above embodiment, the radiator 110 includes a midpoint a in its extension direction. Along the extension direction of the radiator 110, the radiator 110 includes a first end and a second end, both of which are open ends. The feed point b and the ground point e can both be located on the radiator 110 between the midpoint a and the first end, and the feed point b is located between the first end and the midpoint a.

[0245] Please refer to Figure 44 In the above implementation, the matching circuit 130 includes a first sub-matching circuit 131, which includes a first inductor L1 and a first capacitor C1 connected in series. For example, one end of the first capacitor C1 can be coupled to the feed point b, and the other end of the first capacitor C1 can be coupled to one end of the first inductor L1, with the other end of the first inductor L1 used to receive radio frequency signals. Alternatively, one end of the first inductor L1 can be coupled to the feed point b, and the other end of the first inductor L1 can be coupled to one end of the first capacitor C1, with the other end of the first capacitor C1 used to receive radio frequency signals.

[0246] In some implementations, the resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator. Of course, the resonant frequency of the second sub-resonator can also be less than the resonant frequency of the first sub-resonator, and this application does not impose any restrictions on this. This application will describe an example where the resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator.

[0247] Continue to refer to Figure 43 In the above embodiment, under the first sub-resonance and the second sub-resonance, the radiator 110 has a second small current point d, and the current directions on both sides of the second small current point d on the radiator 110 are opposite; under the second resonance, the current directions on the radiator 110 are the same. With this configuration, under the first sub-resonance and the second sub-resonance, the antenna assembly operates in the same mode, both being DM mode; under the second resonance, the antenna assembly operates in CM mode. It can be understood that the second small current point d can be a position where the current on the radiator 110 is close to zero.

[0248] like Figure 44 As shown, the distance between grounding point e and midpoint a is 4mm, and feed point b is located between midpoint a and the first end. The first sub-matching circuit 131 includes a first inductor L1, a first capacitor C1, and a first matching inductor L11. One end of the first capacitor C1 is coupled to feed point b, and the other end of the first capacitor C1 is coupled to one end of the first inductor L1. The other end of the first inductor L1 receives the radio frequency signal, and the other end of the first inductor L1 is also grounded through the first matching inductor L11. The inductance value of the grounding inductor 116 is 1nH, the inductance value of the first inductor L1 is 7.5nH, the inductance value of the first matching inductor L11 is 10nH, and the capacitance value of the first capacitor C1 is 0.5pF. Please refer to... Figure 45 , Figure 45 for Figure 44 The return loss curve of the antenna assembly shown is derived from... Figure 45 It can be seen that the antenna assembly can generate a first sub-resonance, a second sub-resonance, and a second resonance; among them, the resonant frequency of the first resonance can be about 1.9 GHz, the resonant frequency of the second sub-resonance can be about 2.4 GHz, and the resonant frequency of the second resonance can be about 5.1 GHz. Figure 46 for Figure 44 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 46 It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0249] Figure 47 for Figure 46 The current distribution diagrams of the antenna under the first sub-resonance, the second sub-resonance, and the second resonance shown are derived from... Figure 47 It can be seen that under the first sub-resonance and the second sub-resonance, the antenna assembly is in CM mode. Under the second resonance, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0250] In the above implementation, the difference in resonant frequencies between the first and second sub-resonators can be adjusted by changing the position of the grounding point e. As the grounding point e moves towards the first end, that is, as the distance between the grounding point e and the midpoint a increases, the difference in resonant frequencies between the first and second sub-resonators decreases, and at the same time, the resonant frequency of the first resonator shifts to a lower frequency.

[0251] In some implementations, the difference in resonant frequencies between the first and second sub-resonators can also be adjusted by changing the position of the grounding point e. For example, the distance between the feed point b and the first end is less than or equal to one-third of the length of the radiator 110, so that the difference in resonant frequencies between the first and second sub-resonators is less than or equal to 150MHz. This arrangement allows the first and second sub-resonators to be close to each other, thereby ensuring communication quality within the first resonant frequency band; on the other hand, it also allows the resonant frequencies of both the first and second sub-resonators to be located within their respective communication frequency bands.

[0252] In the above embodiment, the distance between the feed point b and the ground point e is less than or equal to one-eighth of the length of the radiator 110, and the distance between the ground point e and the midpoint a is less than or equal to three-eighths of the length of the radiator 110. This arrangement ensures that the difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is moderate.

[0253] In some embodiments, the first resonance is a single resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance (dual resonance). The resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance. The resonant frequency bands of the third and fourth sub-resonances together cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0254] It is understandable that the resonant frequency of the second resonance can be the center frequency of the third and fourth sub-resonances, which is the frequency corresponding to the midpoint between the resonant frequencies of the third and fourth sub-resonances.

[0255] Please refer to Figure 48 In the above embodiments, the feed point b can be located on the radiator 110 between the midpoint a and the first end, and the ground point e is located between the midpoint a and the second end. The matching circuit 130 includes a second sub-matching circuit 132, which includes a second capacitor C2 and a second inductor L2. The second capacitor C2 and the second inductor L2 can be connected in series. The embodiments of this application do not limit the second sub-matching circuit 132, as long as it can make the second resonance a double resonance.

[0256] In some implementations, the resonant frequency of the fourth sub-resonator is greater than the resonant frequency of the third sub-resonator. Of course, the resonant frequency of the fourth sub-resonator can also be less than the resonant frequency of the third sub-resonator; this application does not impose such a limitation on the embodiments. This application will use the example of the resonant frequency of the fourth sub-resonator being greater than that of the third sub-resonator for illustration.

[0257] In the above embodiments, under the third and fourth sub-resonances, the current directions on the radiator 110 are the same; under the first resonance, the radiator 110 has a second small current point d, and the current directions on the radiators 110 on both sides of the second small current point d are opposite. With this configuration, under the first resonance, the antenna assembly is in CM mode; under the third and fourth sub-resonances, the antenna assembly operates in the same mode, which is DM mode.

[0258] like Figure 48 As shown, grounding point e is located between midpoint a and the second end, with a distance of 4mm between grounding point e and the center. Feed point b is located between midpoint a and the first end. In the first sub-matching circuit 131, the second capacitor C2 and the second inductor L2 are connected in series. The capacitance of the second capacitor C2 is 0.5pF, the inductance of the second inductor L2 is 3nH, and the inductance of the grounding inductor 116 is 1nH. Please refer to... Figure 49 , Figure 49 for Figure 48The return loss curve of the antenna assembly is shown. The antenna assembly can generate a first resonance, a third sub-resonance, and a fourth resonance. The resonant frequency of the first resonance can be about 1.65 GHz, the resonant frequency of the third sub-resonance can be about 3.7 GHz, and the resonant frequency of the fourth sub-resonance can be about 5 GHz. Figure 50 for Figure 48 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 50 It is understood that the antenna assembly in this embodiment has high efficiency under the first resonance, the third sub-resonance, and the fourth sub-resonance, ensuring good communication quality.

[0259] Figure 51 for Figure 48 The current distribution diagrams of the antenna shown are for the first sub-resonance, the third sub-resonance, and the fourth sub-resonance. Figure 51 It can be seen that under the first resonance, the radiator 110 has a second small current point d, and the current directions on both sides of the second small current point d are opposite, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0260] In the above implementation, the difference in resonant frequencies between the third and fourth sub-resonators can be adjusted by changing the position of the grounding point e. As the grounding point e moves towards the second end, that is, as the distance between the grounding point e and the midpoint a increases, the difference in resonant frequencies between the third and fourth sub-resonators decreases, while the resonant frequency of the second resonator shifts to a higher frequency.

[0261] In some implementations, the difference in resonant frequencies between the third and fourth sub-resonators can also be adjusted by changing the position of the feed point b. For example, the distance between the feed point b and the first end is less than or equal to one-third of the length of the radiator 110, so that the difference in resonant frequencies between the third and fourth sub-resonators is less than or equal to 500MHz. This arrangement allows the third and fourth sub-resonators to be close to each other, thereby ensuring communication quality within the second resonant frequency band; on the other hand, it also allows the resonant frequencies of both the third and fourth sub-resonators to be located within their respective communication frequency bands.

[0262] In some embodiments, both the first and second resonances are dual resonances; that is, the first resonance includes a first sub-resonant and a second sub-resonant, and the second resonance includes a third sub-resonant and a fourth sub-resonant. The first and second sub-resonants together cover the first resonant frequency band to increase the bandwidth of the first resonance, and the third and fourth sub-resonants together cover the second resonant frequency band to increase the bandwidth of the second resonance. Through this arrangement, the bandwidth of the first and second resonances can be increased, further increasing the bandwidth of the antenna assembly.

[0263] Please refer to Figure 52a In the implementation where both the first and second resonances are double resonances, the feed point b and the ground point e can both be located on the radiator 110 between the midpoint a and the first end, and the feed point b is located between the first end and the midpoint a. The matching circuit 130 includes a first sub-matching circuit and a second sub-matching circuit, such that both the first and second resonances are double resonances.

[0264] In the above implementation, the distance between the feed point b and the ground point e is less than or equal to one-eighth of the length of the radiator 110, and the distance between the ground point e and the midpoint a is less than or equal to three-eighths of the length of the radiator 110. This setting ensures that the difference between the resonant frequencies of the first and second sub-resonators is moderate, as is the difference between the resonant frequencies of the third and fourth sub-resonators.

[0265] like Figure 52b In some embodiments, there may be multiple grounding inductors 116, and the radiator 110 includes multiple grounding points e spaced apart along its extension direction, each grounding point e being coupled to a grounding inductor 116. By providing multiple grounding inductors 116, the antenna aperture of the antenna assembly can be increased.

[0266] like Figure 53 As shown, the distance between grounding point e and midpoint a is 5mm. Feed point b is located between midpoint a and the first end. Matching circuit 130 includes a first sub-matching circuit, a second sub-matching circuit, a first matching inductor L11 and a second matching inductor L12. One end of the first inductor L1 is coupled to feed point b, and the other end of the first inductor L1 is coupled to one end of the second inductor L2. The other end of the first inductor L1 is also grounded through the second capacitor C2. The other end of the second inductor L2 is coupled to one end of the first capacitor C1. The other end of the second inductor L2 is also grounded through the first matching inductor L11. The other end of the first capacitor C1 receives the radio frequency signal, and the other end of the first capacitor C1 is also grounded through the second matching inductor L12. The inductance values ​​of the first inductor L1 are 4nH, the second inductor L2 are 8nH, the first matching inductor L11 are 35nH, the second matching inductor L12 are 10nH, the first capacitor C1 is 0.5pF, the second capacitor C2 is 0.3pF, and the grounding inductor 116 is 1nH.

[0267] Please refer to Figure 54 , Figure 54 for Figure 53The return loss curve of the antenna assembly is shown. The antenna assembly can generate a first sub-resonance, a second sub-resonance, a third sub-resonance, and a fourth sub-resonance. The resonant frequency of the first resonant can be about 1.85 GHz, the resonant frequency of the second sub-resonance can be about 2.25 GHz, the resonant frequency of the third sub-resonance can be about 4.8 GHz, and the resonant frequency of the fourth sub-resonance can be about 5.6 GHz. Figure 55 for Figure 54 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 55 It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, the third sub-resonance and the fourth sub-resonance, ensuring good communication quality.

[0268] Figure 56 for Figure 43 The current distribution diagrams of the antenna assembly shown are for the first sub-resonance, the second sub-resonance, the third sub-resonance, and the fourth sub-resonance. Figure 56 It can be seen that under the first and second sub-resonances, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0269] Please refer to Figure 57 In some embodiments, the floor 120 includes adjacent first side 121 and second side 122, and the radiator 110 includes a first branch 111 opposite to the first side 121 and a second branch 112 opposite to the second side 122. That is, the radiator 110 is disposed at the corner of the floor 120. This arrangement can make full use of the space of the floor 120 and improve the structural compactness of the electronic device 10.

[0270] like Figure 57 As shown, the midpoint a of the radiator 110 can be approximately located at a corner position. The grounding point e is located between the midpoint a and the first end (left end), with a distance of 4 mm between the grounding point e and the midpoint a. The feed point b is located between the midpoint a and the first end. The matching circuit 130 includes a first sub-matching circuit 131, which includes a first inductor L1 and a first capacitor C1. One end of the first inductor is coupled to the feed point b, and one end of the first capacitor C1 is coupled to the other end of the first inductor L1. The other end of the first capacitor C1 is used to receive radio frequency signals. The inductance value of the first inductor L1 is 8.5 nH, the capacitance value of the first capacitor C1 is 0.6 pF, and the inductance value of the grounding inductor 116 is 0.7 nH. Figure 58 for Figure 57 The return loss curve of the antenna assembly is shown. Figure 59 for Figure 57 The impedance circle diagram of the antenna assembly is shown. Figure 58 and Figure 59 It can be seen that the antenna assembly can generate a first sub-resonance, a second sub-resonance, and a second resonance. The resonant frequency of the first resonance is approximately 1.65 GHz, the resonant frequency of the second sub-resonance is approximately 2.15 GHz, and the resonant frequency of the third resonance is approximately 3.95 GHz. Please refer to... Figure 60 , Figure 60 for Figure 57 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 60 It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0271] Figure 61 for Figure 57 The current distribution diagrams of the antenna under the first sub-resonance, the second sub-resonance, and the second resonance shown are derived from... Figure 61 It can be seen that under the first sub-resonance and the second sub-resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the second resonance, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0272] like Figure 62 As shown, grounding point e is located between midpoint a and the second end, and the distance between grounding point e and midpoint a is 4mm. Feed point b is located between midpoint a and the first end. Matching circuit 130 includes a second sub-matching circuit 132, a first matching inductor L11, a first matching capacitor C11, and a second matching capacitor C12. One end of the second inductor L2 is coupled to feed point b, and one end of the second inductor L2 is also grounded through the second capacitor C2. The other end of the second inductor L2 is coupled to one end of the first matching capacitor C11, and one end of the first matching capacitor C11 is also grounded through the second matching capacitor C12. The other end of the first matching capacitor C11 receives radio frequency signals, and the other end of the first matching capacitor C11 is also grounded through the first matching inductor L11. The first matching inductor L11 has an inductance of 10nH, the second inductor L2 has an inductance of 3.2nH, the grounding inductor 116 has an inductance of 1nH, the first matching capacitor C11 has a capacitance of 0.6pF, the second matching capacitor C12 has a capacitance of 0.5pF, and the second capacitor C2 has a capacitance of 1.2pF. Please refer to... Figure 63 and Figure 64 , Figure 63 for Figure 62 The return loss curve of the antenna assembly is shown. Figure 64 for Figure 62 The impedance circle diagram of the antenna assembly shown is derived from... Figure 63 and Figure 64It can be seen that the antenna assembly can generate a first resonance, a third sub-resonance, and a fourth resonance. The resonant frequency of the first resonance is approximately 1.85 GHz, the resonant frequency of the third sub-resonance is approximately 3.25 GHz, and the resonant frequency of the second resonance is approximately 3.65 GHz. Please refer to... Figure 65 , Figure 65 for Figure 62 The antenna efficiency curve of the antenna assembly shown is derived from... Figure 65 It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0273] Figure 66 for Figure 62 The current distribution diagrams of the antenna assembly under the first resonance, third sub-resonance, and fourth sub-resonance shown are derived from... Figure 66 It can be seen that under the first resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0274] like Figure 67 As shown, grounding point e is located between midpoint a and the second end, with a distance of 4mm between grounding point e and the center. Feed point b is located between midpoint a and the first end. The second sub-matching circuit 132 includes a second capacitor C2, a second inductor L2, and a third inductor L3. One end of the second inductor L2 is coupled to feed point b, and the other end of the second inductor L2 is coupled to one end of the second capacitor C2. The other end of the second capacitor C2 receives the radio frequency signal, and the other end of the second capacitor C2 is also grounded through the third inductor L3. The inductance value of the second inductor L2 is 4.5nH, the inductance value of the third inductor L3 is 10nH, the capacitance value of the second capacitor C2 is 0.5pF, and the inductance value of the grounding inductor 116 is 0.7nH. Please refer to... Figure 68 and Figure 69 , Figure 68 for Figure 67 The return loss curve of the antenna assembly is shown. Figure 69 for Figure 67 The impedance circle diagram of the antenna assembly shown is derived from... Figure 68 and Figure 69 It can be seen that the antenna assembly can generate a first resonance, a third sub-resonance, and a fourth sub-resonance. The resonant frequency of the first resonance is approximately 1.85 GHz, the resonant frequency of the third sub-resonance is approximately 3.2 GHz, and the resonant frequency of the fourth sub-resonance is approximately 3.95 GHz. Please refer to... Figure 70 , Figure 70 for Figure 67 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 70It is understood that the antenna assembly in this embodiment has high efficiency under the first resonance, the third sub-resonance, and the fourth sub-resonance, ensuring good communication quality.

[0275] Figure 71 for Figure 67 The current distribution diagrams of the antenna shown are for the first resonance, the third sub-resonance, and the fourth sub-resonance. Figure 71 It can be seen that under the first resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0276] like Figure 72 As shown, grounding point e is located between midpoint a and the first end, and the distance between grounding point e and midpoint a is 4mm. Feeding point b is located between midpoint a and the first end. Matching circuit 130 includes a first sub-matching circuit, a second sub-matching circuit, a first matching inductor L11 and a second matching inductor L12. One end of the first inductor L1 is coupled to one end of the second inductor L2. One end of the first inductor L1 is also grounded through the second capacitor C2. The other end of the second inductor L2 is coupled to the first capacitor C1. The other end of the second inductor L2 is also grounded through the first matching inductor L11. The other end of the first capacitor C1 receives the radio frequency signal. The other end of the first capacitor C1 is also grounded through the second matching inductor L12. The capacitance values ​​of the first capacitor C1 and the second capacitor C2 are 0.4pF, respectively. The inductance values ​​of the first inductor L1 and the second inductor L2 are 4.5nH, 9nH, 30nH, 20nH, and 0.7nH respectively. Please refer to [reference needed]. Figure 73 and Figure 74 , Figure 73 for Figure 72 The return loss curve of the antenna assembly is shown. Figure 74 for Figure 72 The impedance circle diagram of the antenna assembly shown is derived from... Figure 73 and Figure 74 It is known that the antenna assembly can generate a first sub-resonance, a second sub-resonance, a third sub-resonance, and a fourth sub-resonance. The resonant frequency of the first sub-resonance is approximately 1.7 GHz, the second sub-resonance is approximately 2.05 GHz, the third sub-resonance is approximately 3.7 GHz, and the fourth sub-resonance is approximately 4.6 GHz. Please refer to... Figure 75 , Figure 75 for Figure 72 The antenna efficiency curve of the antenna assembly is shown. (From...) Figure 75It is understood that the antenna assembly in the embodiments of this application has high efficiency under the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0277] Figure 76 for Figure 72 The current distribution diagrams of the antenna shown are for the first sub-resonance, the second sub-resonance, the third sub-resonance, and the fourth sub-resonance. Figure 76 It can be seen that under the first and second sub-resonances, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the third and fourth sub-resonances, the current on the radiator 110 is in the same direction, and the antenna assembly is in DM mode.

[0278] Please refer to Figure 77 In some implementations, the antenna assembly further includes a first regulating capacitor C31, one end of which is coupled to a first terminal, and the other end of which is configured to be grounded. In other implementations, the antenna assembly further includes a first regulating inductor L31, one end of which is coupled to the first terminal, and the other end of which is configured to be grounded.

[0279] Please refer to Figure 78 In the figure, curve M1 is the return loss curve when the first terminal is not equipped with the first regulating capacitor C31 and the first regulating inductor L31; M2 is the return loss curve when the first terminal is grounded through the first regulating capacitor C31; and M3 is the return loss curve when the first terminal is grounded through the first regulating inductor L31. Figure 78 It can be seen that by using the first adjusting capacitor C31, the resonant frequencies of the third and fourth sub-resonators can be shifted to lower frequencies, while the resonant frequencies of the first and second sub-resonators remain essentially unchanged. By using the first adjusting inductor L31, the resonant frequencies of the third and fourth sub-resonators can be shifted to higher frequencies, while the resonant frequencies of the first and second sub-resonators remain essentially unchanged.

[0280] Please refer to Figure 79 In the figure, curve K1 is the antenna efficiency curve when the first terminal is not equipped with the first regulating capacitor C31 and the first regulating inductor L31; K2 is the antenna efficiency curve when the first terminal is grounded through the first regulating capacitor C31; and K3 is the antenna efficiency curve when the first terminal is grounded through the first regulating inductor L31. Figure 79 It can be seen that after setting the first regulating capacitor C31 and the first regulating inductor L31, the antenna assembly still has high efficiency and ensures good communication quality.

[0281] Please refer to Figure 80In some implementations, the antenna assembly further includes a second regulating capacitor C41, one end of which is coupled to the second terminal, and the other end of which is configured to be grounded. In other implementations, the antenna assembly further includes a second regulating inductor L41, one end of which is coupled to the second terminal, and the other end of which is configured to be grounded.

[0282] Please refer to Figure 81 In the diagram, curve M1 represents the return loss curve when the second terminal is not equipped with the second regulating capacitor C41 and the second regulating inductor L41; curve M2 represents the return loss curve when the second terminal is grounded through the second regulating capacitor C41; and curve M3 represents the return loss curve when the second terminal is grounded through the second regulating inductor L41. Figure 81 It can be seen that by using the second adjusting capacitor C41, the resonant frequencies of the first and second sub-resonators can be shifted to lower frequencies, while the resonant frequencies of the third and fourth sub-resonators remain essentially unchanged. By using the second adjusting inductor L41, the resonant frequencies of the first and second sub-resonators can be shifted to higher frequencies, while the resonant frequencies of the third and fourth sub-resonators remain essentially unchanged.

[0283] Please refer to Figure 82 In the figure, curve K1 represents the antenna efficiency curve without the second regulating capacitor C41 and the second regulating inductor L41 at the second end; K2 represents the antenna efficiency curve with the second end grounded through the second regulating capacitor C41; and K3 represents the antenna efficiency curve with the second end grounded through the second regulating inductor L41. Figure 82 It can be seen that after setting the second regulating capacitor C41 and the second regulating inductor L41, the antenna assembly still has high efficiency and ensures good communication quality.

[0284] Please refer to Figure 83 In the diagram, M1 represents the initial position of grounding point e between midpoint a and the first end (e.g., ...). Figure 72 The diagram shows the return loss curves of the antenna assembly. M2 is the return loss curve after the ground point e is moved 2mm from its initial position to the midpoint a, and M3 is the return loss curve after the ground point e is moved 4mm from its initial position to the midpoint a. Figure 83 It can be seen that the resonant frequencies of the second and third sub-resonators can be adjusted by grounding point e, while the first and fourth sub-resonators remain basically unchanged; among them, as grounding point e gradually approaches the midpoint a, the second sub-resonator gradually shifts to higher frequencies, and the third sub-resonator gradually shifts to lower frequencies.

[0285] Please refer to Figure 84 In the diagram, K1 represents the initial position of grounding point e between midpoint a and the first end (e.g., ...). Figure 72The antenna efficiency curves of the antenna assembly are shown in the figure. K2 is the antenna efficiency curve after the grounding point e is moved 2mm from the initial position to the midpoint a, and K3 is the antenna efficiency curve after the grounding point e is moved 4mm from the initial position to the midpoint a. Figure 84 It can be seen that by adjusting the position of grounding point e, the antenna assembly still has high efficiency and ensures good communication quality.

[0286] Please refer to Figure 85 In the diagram, M1 represents the initial position of the feed point b between the midpoint a and the first end (e.g., ...). Figure 72 The return loss curves of the antenna assembly are shown in Figure 1. M2 is the return loss curve after the feed point b moves 3mm from its initial position to the midpoint a, and M3 is the return loss curve after the feed point b moves 5mm from its initial position to the midpoint a. Figure 85 It can be seen that the resonant frequencies of the third and fourth sub-resonators can be adjusted by the feed point b, while the first and second sub-resonators remain basically unchanged; among them, as the feed point b gradually approaches the midpoint a, the difference between the resonant frequencies of the third and fourth sub-resonators gradually increases.

[0287] Please refer to Figure 86 In the figure, K1 is the antenna efficiency curve of the antenna assembly when the feed point b is in the initial position between the midpoint a and the first end; K2 is the antenna efficiency curve after the feed point b moves 3mm from the initial position towards the midpoint a; and K3 is the return loss curve after the feed point b moves 5mm from the initial position towards the midpoint a. Figure 86 It can be seen that by adjusting the position of the feed point b, the antenna assembly still has high efficiency and ensures good communication quality.

[0288] Please refer to Figure 87 In the figure, M1 is the return loss curve when the grounding inductance 116 in the antenna assembly is 0.4nH, M2 is the return loss curve when the grounding inductance 116 in the antenna assembly is 0.6nH, and M3 is the return loss curve when the grounding inductance 116 in the antenna assembly is 1nH. Figure 87 It can be seen that the resonant frequencies of the first and second sub-resonators can be adjusted by adjusting the grounding inductance 116, while the third and fourth sub-resonators remain basically unchanged; among them, as the grounding inductance 116 decreases, the first and second sub-resonators gradually shift to higher frequencies.

[0289] Please refer to Figure 88 In the figure, K1 is the antenna efficiency curve when the grounding inductance 116 in the antenna assembly is 0.4nH, K2 is the antenna efficiency curve when the grounding inductance 116 in the antenna assembly is 0.6nH, and K3 is the antenna efficiency curve when the grounding inductance 116 in the antenna assembly is 1nH. Figure 88It can be seen that by adjusting the size of the grounding inductance 116, the antenna assembly still has high efficiency and ensures good communication quality.

[0290] Please refer to Figure 89 and Figure 90 , Figure 89 M1 represents the return loss curve when the antenna assembly does not have a second adjustment inductor and the radiator remains at its original length; M2 represents the return loss curve when the antenna assembly has a second adjustment inductor and the radiator remains at its original length; and M3 represents the return loss curve when the antenna assembly does not have a second adjustment inductor and the radiator is lengthened. Figure 90 K1 represents the antenna efficiency curve when the second regulating inductor is not included in the antenna assembly, and the radiator remains at its original length. K2 represents the antenna efficiency curve when the second regulating inductor is included in the antenna assembly, and the radiator remains at its original length. K3 represents the antenna efficiency curve when the second regulating inductor is not included in the antenna assembly, and the radiator is lengthened. (Comparison) Figure 89 and Figure 90 It can be seen that the efficiency bandwidth of increasing the length of the radiator is better than that of setting a second regulating inductor.

[0291] It should be understood that the "common mode" or "CM mode" in the embodiments of this application includes line common mode and slot common mode, while the "differential mode" or "DM mode" in the embodiments of this application includes line differential mode and slot differential mode, which can be determined according to the structure of the antenna.

[0292] 1. Wire common mode (CM) mode

[0293] Figure 91 The antenna radiator 40 is shown open at both ends and connected to a feed circuit (not shown) at the middle position 41. In one embodiment, the radiator 40 is fed in a symmetrical feed configuration. The feed circuit can be connected to the middle position 41 of the radiator 40 via a feed wire 42. It should be understood that a symmetrical feed can be understood as one end of the feed circuit being connected to the radiator, and the other end being coupled to the ground via a ground plane. The connection point between the feed circuit and the radiator 40 (the feed point) is located at the center of the radiator, which can be, for example, the midpoint of the geometry, or the midpoint of the electrical length (or a certain area within a certain range near the aforementioned midpoint).

[0294] The intermediate position 41 of the radiator 40 may be, for example, the geometric center of the radiator, or the midpoint of the electrical length of the radiator. In one embodiment, the feed line 42 is connected to the radiator 40 via a connector such as a spring clip, and the connection between the connector and the radiator 40 covers the intermediate position 41.

[0295] Figure 92The current and electric field distribution of the antenna are shown. For example... Figure 92 As shown, the current exhibits an opposite distribution on both sides of the middle position 41, for example, a symmetrical distribution; the electric field exhibits a unidirectional distribution on both sides of the middle position 41. Figure 92 As shown, the current at feeder line 42 exhibits a unidirectional distribution. Based on this unidirectional current distribution at feeder line 42, Figure 91 and Figure 92 The type of feeding shown can be called a line CM feed. This is based on the fact that the current is distributed in opposite directions on both sides of the radiator. Figure 92 The antenna pattern shown can be called the line CM mode (or simply CM mode; for example, for a line antenna, CM mode refers to the line CM mode). Figure 92 The current and electric field shown can be referred to as the current and electric field of the line CM mode, respectively.

[0296] 2. Differential mode (DM)

[0297] like Figure 93 The radiator 50 is shown with open ends at both ends and a feed circuit connected at the middle position 51. In one embodiment, the radiator 50 is fed using an anti-symmetrical feed. One end of the feed circuit is connected to a portion of the radiator 50 via a feed wire 52, and the other end of the feed circuit is connected to another portion of the radiator 50 via a feed wire 52. The middle position 51 may include the geometric center of the radiator 50.

[0298] It should be understood that the "center-antisymmetric feeding" mentioned in the embodiments of this application can be understood as the positive and negative poles of the feeding unit being connected to two connection points near the midpoint of the radiator. In one embodiment, the signal amplitudes output by the positive and negative poles of the feeding unit are the same, but the phases are opposite, for example, the phase difference is 180°±10°.

[0299] Figure 94 The current and electric field distribution of the radiator 50 are shown. For example... Figure 94 As shown, the current is distributed in the same direction on both sides of the middle position 51 of the radiator 50, for example, an antisymmetric distribution; the electric field is distributed in opposite directions on both sides of the middle position 51. Figure 94 As shown, the current at feeder line 52 exhibits a reverse distribution. Based on the reverse current distribution at feeder line 52, Figure 93 The type of feeding shown can be called a line DM feed. This is based on the fact that the current is distributed in the same direction on both sides of the radiator. Figure 94 The antenna mode shown can be called line DM mode (or simply DM mode; for example, for a line antenna, DM mode refers to line DM mode). Figure 94The current and electric field shown can be referred to as the current and electric field in the line DM mode, respectively.

[0300] 3. Slot CM mode

[0301] Figure 95 The radiator of the antenna shown has a hollowed-out slot or gap 61, or it can be seen that the radiator 60 of the antenna and the ground plane (e.g., the ground plane of a PCB) enclose the slot or gap 61. In one embodiment, the slot 61 can be formed by slotting in the ground plane. In another embodiment, the slot 61 can be formed by coupling the two ends of the radiator 60 to the ground plane. An opening 62 is provided on one side of the slot 61, and the opening 62 can be specifically located at the middle position of that side. The middle position of this side of the slot 61 can be, for example, the geometric midpoint of the radiator 60, or the midpoint of the electrical length of the radiator, for example, the area where the opening 62 is located on the radiator covers the middle position of this side. A feed circuit can be connected to the opening 62, and an antisymmetric feed is used. It should be understood that antisymmetric feed can be understood as the positive and negative poles of the feed circuit being connected to the two ends of the radiator, respectively. The signal amplitudes output by the positive and negative poles of the feed circuit are the same, but the phases are opposite, for example, the phase difference is 180°±10°.

[0302] Figure 96 The distribution of current, electric field, and magnetic current on the radiator 60 (which may also include a floor) is shown. Figure 96 As shown, the current is distributed in the same direction around the slot 61 on the conductors (such as the ground plane and / or the radiator 60) surrounding the slot 61, the electric field is distributed in opposite directions on both sides of the opening 61 of the slot 61, and the magnetic current is distributed in opposite directions on both sides of the middle position of the slot 61. Figure 96 As shown, the electric field at opening 62 (e.g., the feed point) is in the same direction, and the magnetic current at opening 62 (e.g., the feed point) is also in the same direction. Based on the fact that the magnetic current at opening 62 (the feed point) is in the same direction, Figure 96 This type of feeding can be called slot CM feeding. It is based on the current exhibiting a unidirectional distribution (e.g., antisymmetric distribution) on the radiators on both sides of opening 62, or on the current exhibiting a unidirectional distribution around slot 61 on the conductors surrounding slot 61. Figure 96 The antenna pattern shown can be called slot CM mode (or simply CM mode; for example, for a slot antenna, CM mode refers to slot CM mode). Figure 96 The electric field, current, and magnetic current distribution shown can be referred to as the electric field, current, and magnetic current of the slot CM mode.

[0303] 4. Slot DM mode

[0304] like Figure 97The radiator of the antenna shown has a hollowed-out slot or gap 72, or it can be viewed that the radiator 70 of the antenna and the ground plane (e.g., the ground plane of a PCB) enclose the slot or gap 72. In one embodiment, the slot 72 can be formed by slotting in the ground plane. In another embodiment, the slot 72 can be formed by coupling the two ends of the radiator 70 to the ground plane. A feed circuit is connected at the middle position 71 of the slot 72, and symmetrical feeding is used. It should be understood that symmetrical feeding can be understood as one end of the feed circuit being connected to the radiator, and the other end being coupled to the ground plane to achieve grounding, wherein the connection point between the feed circuit and the radiator (feed point) is located at the center of the radiator, which can be, for example, the midpoint of the geometry, or the midpoint of the electrical length (or a certain range near the aforementioned midpoint). The middle position of one side of the slot 72 is connected to the positive terminal of the feed circuit, and the middle position of the other side of the slot 72 is connected to the negative terminal of the feed circuit. The middle position of the side of the slot 72 may be, for example, the middle position of the radiator 70, and / or the middle position of the floor, such as the geometric midpoint of the radiator 70, or the midpoint of the electrical length of the radiator, such as the connection between the power supply circuit and the radiator covering the middle position 71 of that side.

[0305] Figure 98 The distribution of current, electric field, and magnetic current on the radiator 70 (which may also include a floor) is shown. Figure 98 As shown, in the conductors surrounding slot 72 (such as the ground plane and / or radiator 70), the current is distributed around slot 72, and the current is distributed in opposite directions on both sides of the middle position 71. The electric field is distributed in the same direction on both sides of the middle position 71, and the magnetic current is distributed in the same direction on both sides of the middle position 71. The magnetic current at the feed circuit is distributed in opposite directions (not shown). Based on the opposite magnetic current distribution at the feed circuit, Figure 97 This type of feeding can be referred to as slot DM feeding. It is based on the current exhibiting an opposite distribution (e.g., symmetrical distribution) on both sides of the radiator 70, or based on the current exhibiting an opposite distribution (e.g., symmetrical distribution) around the slot 71. Figure 98 The antenna pattern shown can be called slot DM mode (or simply DM mode; for example, for a slot antenna, DM mode refers to slot DM mode). Figure 98 The electric field, current, and magnetic current distribution shown can be referred to as the electric field, current, and magnetic current of the slot DM mode.

[0306] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An antenna assembly, characterized in that, include: floor; A radiator is disposed on the floor, and a first gap is formed between the radiator and the floor. Both ends of the radiator are grounded along its extension direction. A second gap communicating with the first gap is provided on the radiator. A matching circuit is coupled to a feed point on the radiator. The matching circuit is used to generate a first resonance and a second resonance in the antenna assembly. The resonant frequency of the first resonance is less than the resonant frequency of the second resonance. The first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance. A slot capacitor is used to couple the radiators at both ends of the second slot, and the slot capacitor is used to make the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance less than or equal to 2 GHz.

2. The antenna assembly according to claim 1, characterized in that, When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the slot capacitor is less than or equal to 2 pF; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the capacitance value of the slot capacitor is less than or equal to 5 pF.

3. The antenna assembly according to claim 1 or 2, characterized in that, The first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit, which includes a first inductor and a first capacitor, with the first inductor and the first capacitor connected in series.

4. The antenna assembly according to claim 3, characterized in that, The resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator.

5. The antenna assembly according to any one of claims 1-4, characterized in that, The second resonance includes the third sub-resonance and the fourth sub-resonance. The matching circuit includes a second sub-matching circuit, which includes a second capacitor and a second inductor. One end of the second inductor is coupled to the feed point. One end of the second capacitor is connected to one end of the second inductor. The other end of the second capacitor is grounded. The other end of the second inductor is configured to receive radio frequency signals.

6. The antenna assembly according to claim 5, characterized in that, The radiator includes a midpoint along its extension direction, the feed point is located on one side of the midpoint, and the second slit is located on the other side of the midpoint.

7. The antenna assembly according to claim 5 or 6, characterized in that, The resonant frequency of the fourth sub-resonator is greater than the resonant frequency of the third sub-resonator.

8. The antenna assembly according to any one of claims 1-7, characterized in that, The radiator includes a midpoint in its extending direction, and the distance between the second slit and the midpoint is less than or equal to one-quarter of the length of the radiator.

9. The antenna assembly according to any one of claims 1-8, characterized in that, The radiator includes a first end and a second end, the feed point and the second gap are located between the first end and the second end, and the feed point is located between the second gap and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; The difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is less than or equal to 150MHz; or the difference between the resonant frequency of the third sub-resonator and the resonant frequency of the fourth sub-resonator is less than or equal to 500MHz.

10. An antenna assembly, characterized in that, include: floor; A radiator is disposed on the floor, with both ends of the radiator being open along its extending direction; A matching circuit is coupled to a feed point on the radiator. The matching circuit is used to generate a first resonance and a second resonance in the antenna assembly. The resonant frequency of the first resonance is less than the resonant frequency of the second resonance. The first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance. A grounding inductor, one end of which is coupled to a grounding point on the radiator, and the other end of which is grounded, is used to ensure that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

11. The antenna assembly according to claim 10, characterized in that, When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 3 nH; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 5 nH.

12. The antenna assembly according to claim 10 or 11, characterized in that, The first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit, which includes a first inductor and a first capacitor, with the first inductor and the first capacitor connected in series.

13. The antenna assembly according to claim 12, characterized in that, The resonant frequency of the second sub-resonator is greater than the resonant frequency of the first sub-resonator.

14. The antenna assembly according to any one of claims 10-13, characterized in that, The second resonance includes the third sub-resonance and the fourth sub-resonance. The matching circuit includes a second sub-matching circuit, which includes a second capacitor and a second inductor. One end of the second inductor is coupled to the feed point. One end of the second capacitor is connected to one end of the second inductor. The other end of the second capacitor is grounded. The other end of the second inductor is configured to receive radio frequency signals.

15. The antenna assembly according to claim 14, characterized in that, The radiator includes a midpoint in its extending direction, the feed point and the ground point are both located on the same side of the midpoint, and the ground point is located between the feed point and the midpoint.

16. The antenna assembly according to claim 15, characterized in that, The distance between the feed point and the grounding point is less than or equal to one-eighth of the length of the radiator, and the distance between the grounding point and the midpoint is less than or equal to three-eighths of the length of the radiator.

17. The antenna assembly according to any one of claims 14-16, characterized in that, The resonant frequency of the fourth sub-resonator is greater than the resonant frequency of the third sub-resonator.

18. The antenna assembly according to any one of claims 10-17, characterized in that, The radiator includes a first end and a second end, the feed point and the grounding point are located between the first end and the second end, and the feed point is located between the grounding point and the first end; the distance between the feed point and the first end is less than or equal to one-third of the length of the radiator; The difference between the resonant frequency of the first sub-resonator and the resonant frequency of the second sub-resonator is less than or equal to 150MHz; or the difference between the resonant frequency of the third sub-resonator and the resonant frequency of the fourth sub-resonator is less than or equal to 500MHz.

19. The antenna assembly according to any one of claims 10-18, characterized in that, The floor includes an adjacent first side and a second side, and the radiator includes a first branch opposite to the first side and a second branch opposite to the second side.

20. An electronic device, characterized in that, Includes: a radio frequency device and an antenna assembly as described in any one of claims 1-19, wherein the radio frequency device is coupled to the feed point.

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