Antenna assemblies and terminal equipment

Abstract

This disclosure relates to an antenna assembly and a terminal device. The antenna assembly includes: a first radiating arm to a third radiating arm and a first matching circuit. A first gap is provided between the first radiating arm and the second radiating arm, and a second gap is provided between the second radiating arm and the third radiating arm. A first terminal of the first matching circuit is connected to the end of the second radiating arm near the first gap, and a second terminal of the first matching circuit is grounded. The first matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in various low-frequency bands, the first matching circuit is in the first state, so that the second radiating arm has the effect of loading the physical length of the low-frequency signal path, thereby improving the performance and efficiency of the low-frequency band antenna. When the third radiating arm transmits and receives signals in various mid-to-high-frequency bands, the first matching circuit is in the second state, so that the second radiating arm excites a parasitic current mode at the high-frequency signal position, thereby widening the bandwidth of the high-frequency signal and improving the efficiency of the mid-to-high-frequency antenna.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to an antenna assembly and a terminal device. Background Technology

[0002] With the rise of 5G, the number of antennas in terminal devices such as mobile phones has increased dramatically, and the antenna layout is becoming increasingly compact. At the same time, terminal devices are increasingly iterating towards full-screen and ultra-thin designs, leading to increasingly harsh antenna environments and less than ideal antenna performance. In particular, the performance of low-frequency antennas is significantly affected by the environment. Furthermore, with the rise of 5G, the bandwidth requirements for antennas are also increasing. Summary of the Invention

[0003] This disclosure provides an antenna assembly and a terminal device to at least solve the problems of poor antenna performance and narrow antenna bandwidth in related technologies. The technical solution of this disclosure is as follows:

[0004] According to a first aspect of the present disclosure, an antenna assembly is provided, comprising: a first radiating arm, a second radiating arm, a third radiating arm, and a first matching circuit, wherein a first gap is provided between the first radiating arm and the second radiating arm, and a second gap is provided between the second radiating arm and the third radiating arm.

[0005] Wherein, the first end of the first matching circuit is connected to the end of the second radiating arm near the first gap, and the second end of the first matching circuit is grounded; wherein, the first matching circuit has a first state and a second state;

[0006] When the first radiating arm transmits and receives signals in each low-frequency band, the first matching circuit is in the first state.

[0007] When the third radiating arm transmits and receives signals in each mid-frequency band and each high-frequency band, the first matching circuit is in the second state.

[0008] In one embodiment of this disclosure, the antenna assembly further includes: a first feed point and a first tuning switch;

[0009] The first feed point is located at a position on the first radiating arm away from the first gap, and the first feed point is connected to the first feed source.

[0010] The first terminal of the first tuning switch is connected to the end of the first radiating arm near the first gap, and the second terminal of the first tuning switch is grounded, which is used to select signals of different low frequency bands.

[0011] In one embodiment of this disclosure, the antenna assembly further includes: a second feed point, a second tuning switch, and a second matching circuit;

[0012] The first end of the second matching circuit is connected to the end of the second radiating arm near the second gap, and the second end of the second matching circuit is grounded.

[0013] The second feed point is located at one end of the third radiating arm near the second gap, and the second feed point is connected to the first end of the second tuning switch;

[0014] The first terminal of the second tuning switch is connected to the second feed point, the second terminal of the second tuning switch is connected to the second feed source, and the third terminal of the second tuning switch is connected to the third terminal of the second matching circuit. The second tuning switch is used to select signals in different mid-frequency bands and high-frequency bands. The second matching circuit has a first state and a second state.

[0015] When the first radiating arm transmits and receives signals in the low-frequency band and signals in the high-frequency band, the second matching circuit is in the first state.

[0016] When the third radiating arm transmits and receives signals in each of the aforementioned intermediate frequency bands, the second matching circuit is in the second state.

[0017] In one embodiment of this disclosure, the first tuning switch is a single-pole four-throw switch, used to adjust the first radiating arm to transmit and receive signals in the four low-frequency bands;

[0018] The moving end of the single-pole four-throw switch serves as the first end of the first tuning switch.

[0019] The first stationary terminal of the single-pole four-throw switch is connected to one end of the first impedance element, the second stationary terminal of the single-pole four-throw switch is connected to one end of the second impedance element, the third stationary terminal of the single-pole four-throw switch is connected to one end of the third impedance element, and the fourth stationary terminal of the single-pole four-throw switch is connected to one end of the fourth impedance element. The first node formed by connecting the other ends of the first impedance element, the second impedance element, the third impedance element, and the fourth impedance element serves as the second terminal of the first tuning switch.

[0020] In one embodiment of this disclosure, the second tuning switch is a four-way single-pole single-throw switch, used to adjust the transmission and reception of four mid-frequency band signals and high-frequency band signals by the third radiating arm;

[0021] The second node after the moving end of each single-pole single-throw switch is connected serves as the second end of the second tuning switch.

[0022] The stationary end of the first single-pole single-throw switch is connected to one end of the fifth impedance element, the stationary end of the second single-pole single-throw switch is connected to one end of the sixth impedance element, and the stationary end of the third single-pole single-throw switch is connected to one end of the seventh impedance element. The third node formed by connecting the other ends of the fifth impedance element, the sixth impedance element, and the seventh impedance element serves as the first end of the second tuning switch.

[0023] The stationary terminal of the fourth single-pole single-throw switch is connected to one end of the eighth impedance element, and the other end of the eighth impedance element serves as the third terminal of the second tuning switch.

[0024] In one embodiment of this disclosure, the first matching circuit includes at least one first capacitor;

[0025] Wherein, when the first matching circuit includes a first capacitor, one end of the first capacitor serves as the first end of the first matching circuit, and the other end of the first capacitor serves as the second end of the first matching circuit;

[0026] When the second matching circuit includes two or more first capacitors, one end of the first capacitor connected in series is the first end of the first matching circuit, and the other end of the first capacitor connected in series is the second end of the first matching circuit.

[0027] Wherein, when the first radiating arm transmits and receives signals in each of the low-frequency bands, at least one of the first capacitors is equivalent to the first state;

[0028] When the second radiating arm transmits and receives signals in the mid-frequency band and signals in the high-frequency band, at least one of the first capacitors is equivalent to the second state.

[0029] In one embodiment of this disclosure, the second matching circuit includes: a first inductor;

[0030] Wherein, one end of the first inductor serves as the first end and the third end of the second matching circuit, respectively, and the other end of the first inductor serves as the second end of the second matching circuit;

[0031] When the first radiating arm transmits and receives signals in the low-frequency band and signals in the high-frequency band, the first inductor is equivalent to the first state.

[0032] When the first radiating arm transmits and receives signals in each mid-frequency band, the first inductor is equivalent to the second state.

[0033] In one embodiment of this disclosure, the antenna assembly further includes a third matching circuit;

[0034] The third matching circuit is located between the first feed point and the first feed source, and is used to adjust the resonance generated by the first radiating arm.

[0035] In one embodiment of this disclosure, the third matching circuit includes: a second capacitor and a second inductor;

[0036] In this configuration, one end of the second capacitor is connected to the first feed source, the other end of the second capacitor is connected to the first feed point, one end of the second inductor is connected to one end of the second capacitor, and the other end of the second inductor is grounded.

[0037] In one embodiment of this disclosure, the antenna assembly further includes:

[0038] A fourth matching circuit is disposed between the second tuning switch and the second feed source, and is used to adjust the resonance generated by the third radiating arm.

[0039] In one embodiment of this disclosure, the fourth matching circuit includes a third capacitor;

[0040] One end of the third capacitor is connected to the second feed source, and the other end of the third capacitor is connected to the second end of the second tuning switch.

[0041] According to a second aspect of the present disclosure, a terminal device is provided, which includes the antenna assembly described above.

[0042] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0043] According to embodiments of this disclosure, the antenna assembly includes a first radiating arm, a second radiating arm, a third radiating arm, and a first matching circuit. A first gap is provided between the first and second radiating arms, and a second gap is provided between the second and third radiating arms. A first terminal of the first matching circuit is connected to the end of the second radiating arm near the first gap, and a second terminal of the first matching circuit is grounded. The first matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in various low-frequency bands, the first matching circuit is in the first state. This causes the second radiating arm to exert a physical length load on the low-frequency signal path, making the longitudinal current mode of the first radiating arm more pronounced, thereby improving the performance and efficiency of the low-frequency band antenna. When the third radiating arm transmits and receives signals in various mid-frequency bands and high-frequency bands, the first matching circuit is in the second state. This causes the second radiating arm to excite a parasitic current mode at the high-frequency signal location, thereby widening the bandwidth of the high-frequency signal and improving the efficiency of the high-frequency antenna and the antenna efficiency under mid-to-high frequency carrier aggregation.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0046] Figure 1 This is a schematic diagram of an antenna assembly according to an embodiment of the present disclosure;

[0047] Figure 2 This is a schematic diagram of an antenna assembly according to an embodiment of the present disclosure;

[0048] Figure 3 This is a schematic diagram of an antenna assembly according to another embodiment of the present disclosure;

[0049] Figure 4 This is a low-, mid-, and high-frequency standing wave diagram according to an embodiment of the present disclosure;

[0050] Figure 5 This is a diagram of low, mid, and high frequency band antenna efficiency according to an embodiment of the present disclosure. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0053] The antenna assembly and terminal device of embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0054] Figure 1 This is a schematic diagram of an antenna assembly according to an embodiment of the present disclosure.

[0055] like Figure 1As shown, the antenna assembly of this embodiment includes: a first radiating arm a, a second radiating arm b, a third radiating arm c, and a first matching circuit 10. A first gap S1 is provided between the first radiating arm a and the second radiating arm b, and a second gap S2 is provided between the second radiating arm b and the third radiating arm c. A first terminal of the first matching circuit 10 is connected to the end of the second radiating arm b near the first gap a, and a second terminal of the first matching circuit 10 is grounded. The first matching circuit 10 has a first state and a second state; when the first radiating arm a transmits and receives signals in various low-frequency bands, the first matching circuit 10 is in the first state; when the third radiating arm c transmits and receives signals in various mid-frequency bands and various high-frequency bands, the first matching circuit 10 is in the second state.

[0056] In this configuration, the first radiating arm a is a low-frequency antenna a, the second radiating arm b is a suspended metal frame b, and the third radiating arm c is a mid-to-high-frequency antenna c. Both the first gap S1 and the second gap S2 can be 0.9mm wide. The first matching circuit 10 can be connected to one end of the second radiating arm b near the first gap S1 via the first spring contact J.

[0057] In this embodiment, at low frequencies, the first matching circuit 10 on the right side of the suspended metal frame b is equivalent to an open circuit (first state), making the suspended metal frame b in a suspended state. This couples the low-frequency antenna a and the suspended metal frame b, and the suspended metal frame b acts as a load, which is equivalent to lengthening the physical length of the low-frequency antenna a. The longitudinal current mode of the entire metal frame is obvious, thereby improving the antenna performance in the low-frequency band. At mid-to-high frequencies, the first matching circuit 10 on the right side of the suspended metal frame b is in a grounded state (second state). This excites high-frequency parasitic modes on the mid-to-high frequency antenna c, thereby widening the bandwidth of the mid-to-high frequency antenna and improving the antenna performance.

[0058] As one possible implementation of the first matching circuit 10, the first matching circuit 10 includes at least one first capacitor C1; wherein, when the first matching circuit 10 includes one first capacitor C1, one end of the first capacitor C1 serves as the first terminal of the first matching circuit 10, and the other end of the first capacitor C1 serves as the second terminal of the first matching circuit 10; when the second matching circuit 20 includes two or more first capacitors C1, one end of each first capacitor C1 connected in series serves as the first terminal of the first matching circuit 10, and the other end of each first capacitor C1 connected in series serves as the second terminal of the first matching circuit 10; wherein, when the first radiating arm a transmits and receives signals in each low-frequency band, at least one first capacitor C1 is equivalent to a first state; when the second radiating arm b transmits and receives signals in each mid-frequency band and signals in each high-frequency band, at least one first capacitor C1 is equivalent to a second state.

[0059] In other words, at low frequencies, at least one capacitor C1 is equivalent to an open circuit, making the floating metal frame b in a floating state. This couples the low-frequency antenna a with the floating metal frame b, which acts as a load, effectively lengthening the physical length of the low-frequency antenna a. The longitudinal current mode of the entire metal frame is obvious, thus improving the antenna performance in the low-frequency band. At mid-to-high frequencies, at least one capacitor C1 is in a short-circuit state, equivalent to a grounded state (i.e., the second state). This excites high-frequency parasitic modes on the mid-to-high frequency antenna c, thereby widening the bandwidth of the mid-to-high frequency antenna and improving its performance.

[0060] It should be noted that at least one capacitor C1 can have a capacitance value of 0.3pF.

[0061] In one embodiment of this disclosure, such as Figure 2 As shown, the antenna assembly described above further includes: a first feed point F1 and a first tuning switch T1; wherein, the first feed point F1 is located at a position of the first radiating arm a away from the first gap S1, the first feed point F1 is connected to the first radiating arm a by a screw, the first feed point F1 is connected to the first feed source E1, and the first feed point provides power to the first radiating arm a; the first end of the first tuning switch T1 is connected to the end of the first radiating arm a near the first gap S1, the second end of the first tuning switch T1 is grounded, and the first tuning switch T1 is used to select signals of different low frequency bands.

[0062] The different low-frequency bands may include a first band of 700-800MHz, a second band of 796-860MHz, a third band of 824-894MHz, and a fourth band of 880-960MHz.

[0063] As one possible implementation of the first tuning switch T1, the first tuning switch T1 is a single-pole four-throw switch, used to adjust the first radiating arm a to transmit and receive signals in four low-frequency bands; wherein, the moving end of the single-pole four-throw switch serves as the first end of the first tuning switch T1; the first stationary end of the single-pole four-throw switch is connected to one end of the first impedance element, the second stationary end of the single-pole four-throw switch is connected to one end of the second impedance element, the third stationary end of the single-pole four-throw switch is connected to one end of the third impedance element, the fourth stationary end of the single-pole four-throw switch is connected to one end of the fourth impedance element, and the first node formed by connecting the other ends of the first impedance element, the second impedance element, the third impedance element, and the fourth impedance element serves as the second end of the first tuning switch T1.

[0064] It should be noted that the first, second, third, and fourth impedance elements can be resistors with different resistance values, inductors with different inductance values, or capacitors with different capacitance values; there are no specific restrictions here. For example, the inductance value of the first impedance element can be 39nH, the inductance value of the second impedance element can be 17nH, the inductance value of the third impedance element can be 11nH, and the inductance value of the fourth impedance element can be 1nH.

[0065] In this embodiment, the first feed point F1, the first tuning switch T1, and the first radiating arm a form the path for the low-frequency signal. The right side of the second radiating arm b is connected to the first spring J, which is connected via... Figure 3 At least one first capacitor C1 (the first capacitor C1 can be a capacitor with a small capacitance value) is connected to realize the return path to ground.

[0066] In one embodiment of this disclosure, such as Figure 2 As shown, the antenna assembly further includes: a second feed point F2, a second tuning switch T2, and a second matching circuit 20, wherein a third gap S3 is provided between the first radiating arm a and the third radiating arm c. The first end of the second matching circuit 20 is connected to the end of the second radiating arm b near the second gap S2, and the second end of the second matching circuit 20 is grounded. The second feed point F2 is located at the end of the third radiating arm c near the second gap S2, and the second feed point F2 is connected via a second spring contact H (such as...). Figure 3 The first radiating arm (as shown) is connected to the third radiating arm c; the first end of the second tuning switch T2 is connected to the second feed point F2, the second end of the second tuning switch T2 is connected to the second feed source E2, and the third end of the second tuning switch T2 is connected to the third end of the second matching circuit 20. The second tuning switch T2 is used to select signals in different intermediate frequency bands and high frequency bands. The second matching circuit 20 has a first state and a second state. When the first radiating arm a transmits and receives signals in each low frequency band and each high frequency band, the second matching circuit 20 is in the first state. When the third radiating arm c transmits and receives signals in each intermediate frequency band, the second matching circuit 20 is in the second state.

[0067] The different mid-frequency bands may include the fifth band at 1710-1900MHz and the sixth band at 1920-2170MHz; the different high-frequency bands may include the seventh band at 2300-2400MHz and the eighth band at 2500-2700MHz.

[0068] In this embodiment, the second matching circuit 20 is in a floating state (first state) at low and high frequencies; and in a grounded state (second state) at mid-frequency frequencies. In this way, the second matching circuit 20 increases the floating metal frame b to ground, thereby solving the ESD (Electro-Static discharge) problem.

[0069] As one possible implementation of the second tuning switch T2, the second tuning switch T2 is a four-way single-pole single-throw switch used to adjust the transmission and reception of four mid-frequency band signals and high-frequency band signals by the third radiating arm c. The second node formed by connecting the moving ends of each single-pole single-throw switch serves as the second terminal of the second tuning switch T2. The stationary end of the first single-pole single-throw switch is connected to one end of the fifth impedance element; the stationary end of the second single-pole single-throw switch is connected to one end of the sixth impedance element; the stationary end of the third single-pole single-throw switch is connected to one end of the seventh impedance element; and the third node formed by connecting the other ends of the fifth, sixth, and seventh impedance elements serves as the first terminal of the second tuning switch T2. The stationary end of the fourth single-pole single-throw switch is connected to one end of the eighth impedance element; and the other end of the eighth impedance element serves as the third terminal of the second tuning switch T2.

[0070] It should be noted that the fifth, sixth, seventh, and eighth impedance elements can be resistors with different resistance values, inductors with different inductance values, or capacitors with different capacitance values; there are no specific restrictions here. For example, the inductance value of the fifth impedance element can be 4.3nH, the inductance value of the sixth impedance element can be 2.6nH, the inductance value of the seventh impedance element can be 1.5nH, and the inductance value of the eighth impedance element can be the equivalent inductance value of the fifth, sixth, and seventh impedance elements connected in parallel.

[0071] As one possible implementation of the second matching circuit 20, such as Figure 2 As shown, the second matching circuit 20 includes: a first inductor L1; wherein one end of the first inductor L1 serves as the first terminal of the second matching circuit 20 and the third terminal of the second matching circuit 20, and the other end of the first inductor L1 serves as the second terminal of the second matching circuit 20; wherein, when the first radiating arm a transmits and receives signals in each low-frequency band and signals in each high-frequency band, the first inductor L1 is equivalent to a first state; when the first radiating arm a transmits and receives signals in each mid-frequency band, the first inductor L1 is equivalent to a second state.

[0072] In other words, by adding a first inductor L1 (the value of which can be relatively large) to the left side of the floating metal frame b, an ESD return-to-ground discharge path is formed for the floating metal frame b, thereby solving the ESD problem.

[0073] In this embodiment, the path for the mid-to-high frequency signal is formed by the second feed point F2 and the third radiating arm c. The left side of the second radiating arm b is connected to the second spring H, and the second spring H is connected to one branch of the second tuning switch T2.

[0074] It should be noted that the inductance value of the first inductor L1 can be 56nh.

[0075] In one embodiment of this disclosure, such as Figure 2 As shown, the antenna assembly described above also includes a third matching circuit 30; wherein the third matching circuit 30 is disposed between the first feed point F1 and the first feed source E1, and is used to adjust the resonance generated by the first radiating arm a.

[0076] As a possible implementation of the third matching circuit 30, such as Figure 2 As shown, the third matching circuit 30 includes: a second capacitor C2 and a second inductor L2; wherein, one end of the second capacitor C2 is connected to the first feed source E1, the other end of the second capacitor C2 is connected to the first feed point F1, one end of the second inductor L2 is connected to one end of the second capacitor C2, and the other end of the second inductor L2 is grounded. It should be noted that the inductance value of the second capacitor C2 can be 22pF, and the inductance value of the second inductor L2 can be 4.1nH.

[0077] In one embodiment of this disclosure, such as Figure 2 As shown, the antenna assembly described above also includes a fourth matching circuit 40, wherein the fourth matching circuit 40 is disposed between the second tuning switch T2 and the second feed source E2, and is used to adjust the resonance generated by the third radiating arm c.

[0078] As a possible implementation of the fourth matching circuit 40, such as Figure 2 As shown, the fourth matching circuit 40 includes a third capacitor C3; one end of the third capacitor C3 is connected to the second feed source E2, and the other end of the third capacitor C3 is connected to the second terminal of the second tuning switch T2. It should be noted that the capacitance value of the third capacitor C3 is 1.1 pF.

[0079] In this embodiment, at low frequencies, the first contact J on the right side of the second radiating arm b, connected in series with at least one capacitor C1, is equivalent to an open circuit to ground. The first inductor L1 connected to the second contact H on the left side of the second radiating arm b is also equivalent to an open circuit, and is simultaneously open-circuited via the second tuning switch T2. The second radiating arm b effectively adds physical length to the low-frequency signal path, resulting in a significant longitudinal current pattern in the floor of the entire metal frame. This improves the efficiency of the first radiating arm a. Figure 4 As shown, a 1dB improvement can be obtained.

[0080] During the intermediate frequency stage, the first spring J on the right side of the second radiating arm b is equivalent to a ground short circuit state through at least one capacitor C1 connected in series, and is also in a short circuit state through the second tuning switch T2.

[0081] In the high-frequency phase, the first spring J on the right side of the second radiating arm b is equivalent to a ground short-circuit state through at least one capacitor C1 connected in series, and is simultaneously in an open-circuit state through the second tuning switch T2. At the same time, the second radiating arm b excites a parasitic current mode at the high-frequency signal location, thereby widening the high-frequency signal bandwidth and improving the efficiency of the high-frequency antenna, as well as the antenna efficiency under mid-to-high-frequency carrier aggregation conditions. Figure 5 As shown, the full-band efficiency is above -5dB.

[0082] In addition, the ESD problem is solved by adding a first inductor L1 to the second spring H on the left side of the second radiating arm b to form an ESD return-to-ground discharge path for the second radiating arm b.

[0083] In summary, through the embodiments of this disclosure, the antenna assembly includes a first radiating arm, a second radiating arm, a third radiating arm, and a first matching circuit. A first gap is provided between the first and second radiating arms, and a second gap is provided between the second and third radiating arms. The first terminal of the first matching circuit is connected to the end of the second radiating arm near the first gap, and the second terminal of the first matching circuit is grounded. The first matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in various low-frequency bands, the first matching circuit is in the first state. This causes the second radiating arm to exert a physical length load on the low-frequency signal path, making the longitudinal current mode of the ground plane of the entire metal frame more pronounced, thereby improving the performance and efficiency of the low-frequency antenna. When the third radiating arm transmits and receives signals in various mid-frequency bands and various high-frequency bands, the first matching circuit is in the second state. This allows the second radiating arm to excite a parasitic current mode at the high-frequency signal location, thereby widening the bandwidth of the high-frequency signal and improving the efficiency of the high-frequency antenna, as well as the antenna efficiency under mid-to-high frequency carrier aggregation.

[0084] Based on the above embodiments, this disclosure also proposes a terminal device that includes the antenna assembly described above.

[0085] The terminal device of this disclosure embodiment can improve antenna performance and broaden antenna bandwidth through the antenna components described above.

[0086] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0087] According to embodiments of this disclosure, the antenna assembly includes a first radiating arm, a second radiating arm, a third radiating arm, and a first matching circuit. A first gap is provided between the first and second radiating arms, and a second gap is provided between the second and third radiating arms. A first terminal of the first matching circuit is connected to the end of the second radiating arm near the first gap, and a second terminal of the first matching circuit is grounded. The first matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in various low-frequency bands, the first matching circuit is in the first state. This causes the second radiating arm to exert a physical length load on the low-frequency signal path, making the longitudinal current mode of the ground plane of the entire metal frame obvious, thus improving the performance and efficiency of the low-frequency band antenna. When the third radiating arm transmits and receives signals in various mid-frequency bands and various high-frequency bands, the first matching circuit is in the second state. This enables the second radiating arm to excite a parasitic current mode at the high-frequency signal location, thereby widening the bandwidth of the high-frequency signal and improving the efficiency of the high-frequency antenna and the antenna efficiency in the mid-to-high frequency carrier aggregation state. In addition, the antenna assembly of this embodiment is also provided with a second matching circuit. The first end of the second matching circuit is connected to the end of the second radiating arm near the second gap, the second end of the second matching circuit is grounded, and the third end of the second matching circuit is connected to the third end of the second tuning switch. The second matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in each low-frequency band and signals in each high-frequency band, the second matching circuit is in the first state. When the third radiating arm transmits and receives signals in each mid-frequency band, the second matching circuit is in the second state. When the second matching circuit is in the second state, an ESD return-to-ground discharge path for the second radiating arm can be formed through the second matching circuit, thereby solving the ESD problem of the antenna.

[0088] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0089] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna assembly, comprising: The system comprises a first radiating arm, a second radiating arm, a third radiating arm, a first matching circuit, a first feed point, and a first tuning switch. A first gap is provided between the first radiating arm and the second radiating arm, and a second gap is provided between the second radiating arm and the third radiating arm. The second radiating arm is a suspended metal frame. The first end of the first matching circuit is connected to the end of the second radiating arm near the first gap, and the second end of the first matching circuit is grounded; wherein, the first matching circuit has a first state and a second state, and the first matching circuit includes: at least one first capacitor, when the first radiating arm transmits and receives signals of each low frequency band, at least one first capacitor is equivalent to the first state; when the third radiating arm transmits and receives signals of each mid frequency band and signals of each high frequency band, at least one first capacitor is equivalent to the second state; The first feed point is located at a position on the first radiating arm away from the first gap, and the first feed point is connected to the first feed source; The first terminal of the first tuning switch is connected to the end of the first radiating arm near the first gap, and the second terminal of the first tuning switch is grounded, which is used to select signals of different low frequency bands.

2. The antenna assembly as claimed in claim 1, characterized in that, Also includes: Second feed point, second tuning switch, and second matching circuit; The first end of the second matching circuit is connected to the end of the second radiating arm near the second gap, and the second end of the second matching circuit is grounded. The second feed point is located at one end of the third radiating arm near the second gap; The first terminal of the second tuning switch is connected to the second feed point, the second terminal of the second tuning switch is connected to the second feed source, and the third terminal of the second tuning switch is connected to the third terminal of the second matching circuit. The second tuning switch is used to select signals in different mid-frequency bands and high-frequency bands. The second matching circuit has a first state and a second state. When the first radiating arm transmits and receives signals in the low-frequency band and signals in the high-frequency band, the second matching circuit is in the first state. When the third radiating arm transmits and receives signals in each of the aforementioned intermediate frequency bands, the second matching circuit is in the second state.

3. The antenna assembly as described in claim 1, characterized in that, The first tuning switch is a single-pole four-throw switch, used to adjust the first radiating arm to transmit and receive signals in the four low-frequency bands; The moving end of the single-pole four-throw switch serves as the first end of the first tuning switch. The first stationary terminal of the single-pole four-throw switch is connected to one end of the first impedance element, the second stationary terminal of the single-pole four-throw switch is connected to one end of the second impedance element, the third stationary terminal of the single-pole four-throw switch is connected to one end of the third impedance element, and the fourth stationary terminal of the single-pole four-throw switch is connected to one end of the fourth impedance element. The first node formed by connecting the other ends of the first impedance element, the second impedance element, the third impedance element, and the fourth impedance element serves as the second terminal of the first tuning switch.

4. The antenna assembly as described in claim 2, characterized in that, The second tuning switch is a four-way single-pole single-throw switch, used to adjust the transmission and reception of four mid-frequency band signals and high-frequency band signals by the third radiating arm; The second node after the moving end of each single-pole single-throw switch is connected serves as the second end of the second tuning switch. The stationary end of the first single-pole single-throw switch is connected to one end of the fifth impedance element, the stationary end of the second single-pole single-throw switch is connected to one end of the sixth impedance element, and the stationary end of the third single-pole single-throw switch is connected to one end of the seventh impedance element. The third node formed by connecting the other ends of the fifth impedance element, the sixth impedance element, and the seventh impedance element serves as the first end of the second tuning switch. The stationary terminal of the fourth single-pole single-throw switch is connected to one end of the eighth impedance element, and the other end of the eighth impedance element serves as the third terminal of the second tuning switch.

5. The antenna assembly as claimed in claim 1, characterized in that, When the first matching circuit includes a first capacitor, one end of the first capacitor serves as the first terminal of the first matching circuit, and the other end of the first capacitor serves as the second terminal of the first matching circuit. When the second matching circuit includes two or more first capacitors, one end of the series connection of each first capacitor serves as the first end of the first matching circuit, and the other end of the series connection of each first capacitor serves as the second end of the first matching circuit.

6. The antenna assembly as claimed in claim 2, characterized in that, The second matching circuit includes: a first inductor; Wherein, one end of the first inductor serves as the first end and the third end of the second matching circuit, respectively, and the other end of the first inductor serves as the second end of the second matching circuit; When the first radiating arm transmits and receives signals in the low-frequency band and signals in the high-frequency band, the first inductor is equivalent to the first state. When the first radiating arm transmits and receives signals in each mid-frequency band, the first inductor is equivalent to the second state.

7. The antenna assembly as claimed in claim 1, characterized in that, Also includes: Third matching circuit; The third matching circuit is located between the first feed point and the first feed source, and is used to adjust the resonance generated by the first radiating arm.

8. The antenna assembly as claimed in claim 7, characterized in that, The third matching circuit includes: a second capacitor and a second inductor; In this configuration, one end of the second capacitor is connected to the first feed source, the other end of the second capacitor is connected to the first feed point, one end of the second inductor is connected to one end of the second capacitor, and the other end of the second inductor is grounded.

9. The antenna assembly as claimed in claim 2, characterized in that, Also includes: A fourth matching circuit is disposed between the second tuning switch and the second feed source, and is used to adjust the resonance generated by the third radiating arm.

10. The antenna assembly as claimed in claim 9, characterized in that, The fourth matching circuit includes a third capacitor; One end of the third capacitor is connected to the second feed source, and the other end of the third capacitor is connected to the second end of the second tuning switch.

11. A terminal device, characterized in that, Includes the antenna assembly as described in any one of claims 1-10 above.

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