Antenna structure and electronic equipment

Abstract

The invention discloses an antenna structure and electronic equipment. The antenna structure comprises a flexible antenna; the flexible antenna comprises an antenna radiation unit, an antenna feeder and an antenna grounding layer, and the antenna radiation unit is connected with the antenna grounding layer through the antenna feeder; a first stop-band ring is arranged on the antenna radiation unit, and the first stop-band ring is of a slot structure; the first stop-band ring is used for suppressing a signal of a first target frequency, and the first target frequency is adjacent to or overlapped with the working frequency band of the flexible antenna.

Description

Technical Field

[0001] This application belongs to the field of communication technologies, and particularly relates to an antenna structure and an electronic device. Background Art

[0002] Currently, Long Term Evolution (LTE) and Wireless Fidelity (WIFI) technologies have been widely applied in mobile intelligent electronic devices. However, due to the limited spectrum resources, some operating frequency bands are very close physically, resulting in interference problems easily occurring during coexistence. For example, WIFI 2.4G operates in the frequency band of 2.4 GHz to 2.4835 GHz, while LTE B40 and B41 operate in the frequency bands of 2.3 GHz to 2.4 GHz and 2.496 GHz to 2.690 GHz respectively. There are actual user scenarios where WIFI 2.4G coexists with LTE B40 / B41. This proximity of frequency bands causes partial overlap or adjacent frequency interference of signals in each frequency band. Especially in high-density scenarios with multi-device coexistence, the interference problem is more serious, thus affecting the communication service quality of electronic devices. Summary of the Invention

[0003] The objective of the embodiments of this application is to provide an antenna structure and an electronic device, which can solve the problem that existing electronic devices are vulnerable to adjacent frequency interference in multi-frequency band coexistence scenarios, thereby affecting the communication service quality.

[0004] In a first aspect, the embodiments of this application propose an antenna structure, including: a flexible antenna;

[0005] The flexible antenna includes an antenna radiation unit, an antenna feeder, and an antenna ground layer, and the antenna radiation unit is connected to the antenna ground layer through the antenna feeder;

[0006] A first stopband ring is arranged on the antenna radiation unit, and the first stopband ring is a slot structure;

[0007] The first stopband ring is used to suppress signals of a first target frequency, and the first target frequency is adjacent to or overlaps with the operating frequency band of the flexible antenna.

[0008] In a second aspect, the embodiments of this application propose an electronic device, including:

[0009] A housing;

[0010] An antenna structure, and the antenna structure is the antenna structure according to the first aspect.

[0011] In an embodiment of the present application, the antenna structure includes: a flexible antenna; the flexible antenna includes an antenna radiation unit, an antenna feeder, and an antenna ground layer, and the antenna radiation unit is connected to the antenna ground layer through the antenna feeder; a first stopband ring is disposed on the antenna radiation unit, and the first stopband ring is a slot structure; the first stopband ring is used to suppress signals of a first target frequency, and the first target frequency is adjacent to or overlaps with the operating frequency band of the flexible antenna. In this way, by designing a stopband ring with a slot structure on the flexible antenna to suppress adjacent frequency interference of the target frequency, the antenna performance can be effectively improved, and the communication service quality of the electronic device can be guaranteed.

[0012] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1a and Figure 1b are one of the front and back schematic views of the antenna structure according to an embodiment of the present application;

[0015] Figure 2a and Figure 2b are the front and back schematic views of the stopband ring structure of the antenna structure according to an embodiment of the present application;

[0016] Figure 3 is a schematic diagram of the relationship between the reflection coefficient and frequency of the flexible antenna according to an embodiment of the present application;

[0017] Figure 4 is according to Figure 2a the relationship diagram of the stopband ring antenna standing wave ratio and frequency of the antenna structure;

[0018] Figure 5a and Figure 5b are the second of the front and back schematic views of the antenna structure according to an embodiment of the present application;

[0019] Figure 6a and Figure 6b are the third of the front and back schematic views of the antenna structure according to an embodiment of the present application;

[0020] Figure 7a and Figure 7b are the fourth of the front and back schematic views of the antenna structure according to an embodiment of the present application;

[0021] Figure 8 is according to Figure 7aSchematic diagram of the relationship between the standing wave ratio and frequency of the stub antenna of the antenna structure;

[0022] Figure 9a and Figure 9b is the fifth front and back schematic diagrams of the antenna structure according to the embodiment of the present application;

[0023] Figure 10 is the schematic diagram of the structure of the electronic device according to the embodiment of the present application. Detailed implementation manners

[0024] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0025] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or multiple. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0027] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] To make the embodiments of this application clearer, the following introduces the relevant technical knowledge involved in the embodiments of this application:

[0029] With the rapid development of mobile communication technology, LTE and WIFI technologies have been widely used in intelligent electronic devices. However, due to the limited nature of spectrum resources, the WIFI 2.4GHz band is very close to the LTE B40 / B41 bands physically, resulting in interference problems when they coexist. This proximity of the bands causes partial overlap or adjacent-frequency interference between WIFI signals and LTE signals in the spectrum, especially in high-density scenarios with multiple devices coexisting, where the interference problem is particularly prominent.

[0030] The mechanism of interference mainly stems from the following aspects: First, the transmission power of LTE base stations is usually much higher than that of WIFI devices, resulting in the possibility that LTE signals may swamp WIFI signals, making it difficult for WIFI devices to receive data normally; Second, WIFI and LTE use different modulation techniques. For example, WIFI uses direct sequence spread spectrum (DSSS) or orthogonal frequency division multiplexing (OFDM), and LTE uses OFDM. The difference in modulation methods may cause interference between signals; In addition, the anti-interference ability of WIFI devices against LTE signals is weak, and they are easily affected by out-of-band leakage or harmonic interference of LTE signals. This interference will not only lead to a decrease in the WIFI network rate, an increase in latency, and an increase in the packet loss rate, but may also affect the throughput and bit error rate of the LTE network.

[0031] Specifically, the operating frequencies of LTE / New Radio (NR) B40 / 41 are very close to those of WIFI 2.4GHz. The operating frequency band of B40 is 2.3GHz - 2.4GHz; the operating frequency band of B41 is 2.496GHz - 2.69GHz; the operating frequency band of WIFI 2.4G is 2.4GHz - 2.4835GHz. In the actual usage scenarios of users, there are coexistence scenarios of B40 / B41 / N40 / N41 and WIFI 2.4G. For example, when the mobile card operates in the B40 / B41 scenario and the mobile phone WIFI personal hotspot is turned on. In this way, there is a coexistence scenario of B41 and WIFI on the same device. If the isolation between the B41 antenna and WIFI of the electronic device is insufficient, then when the signal in the B41 frequency band is transmitted, the WIFI throughput will decrease. Referring to the measured data of historical projects, the WIFI throughput decreases by about 10 - 16%, seriously affecting the user's Internet experience. Similarly, the WIFI signal will also interfere with the sensitivity of the B40 / B41 frequency band, and the sensitivity of the B40 frequency band will drop back by 4.9dB.

[0032] The mutual interference between the B40 / B41 frequency bands and WIFI 2.4G has become a common problem in the industry. Referring to historical projects, take the WCN7851 chip as an example. The interference signal at the receiving port position of the WCN7851 chip needs to be controlled below -45dBm to ensure no interference.

[0033] To solve the above adjacent frequency interference problem, the industry has proposed a variety of technical solutions, including frequency band isolation, power control, filter design, and intelligent scheduling algorithms, etc. However, with the popularization of 5G technology and the increase in Internet of Things devices, the spectrum resources have become more tense, and the interference problem has become more complex. Therefore, in-depth research on the coexistence interference mechanism between WIFI 2.4GHz and LTE B40 / B41 and the proposal of innovative solutions are of great significance for improving the performance of communication systems and user experience.

[0034] There are currently two difficulties in reducing the coexistence interference between cellular LTE and WIFI: 1) Since the frequency points of B40 / B41 and WIFI2.4G are too close, the filter process cannot reach the required level, and it is impossible to ensure effective out-of-band suppression of adjacent frequency points. Currently, the filter suppression is basically 2 - 5dB; 2) Due to the current overall space limitation of the device, the B40 / B41 antennas are defined as ANT13 and ANT25, and the WIFI 2.4G is defined at ANT22 and ANT24. The distance between the antennas is very close, and it is impossible to ensure sufficient isolation. Referring to historical projects, the isolation between the cellular and WIFI 2.4G is about 15 - 17dB, and the link budget shows that the isolation needs to be ensured above 19dB to have no interference.

[0035] To this end, the present application proposes a flexible antenna design that realizes stopband characteristics in the form of slots. By adding complementary opening resonance to the cellular antenna, the antenna stopband design is realized, such as setting the stopband frequency to the WIFI 2.4G frequency band, thereby increasing the isolation between the cellular antenna and the WIFI antenna. In addition, through multiple stopband designs, the increase in isolation of multiple frequency points can be achieved at the same time, for example, the two stopband frequencies can be set to around 2.4GHz and 5GHz.

[0036] The antenna structure and electronic device provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0037] See also Figure 1a , Figure 1b , Figure 2a and Figure 2b , Figures 1a to 2b This is a schematic diagram of the antenna structure provided in the embodiment of the present application. Figure 1a , Figure 1b , Figure 2a and Figure 2b As shown, the antenna structure includes: a flexible antenna 100;

[0038] The flexible antenna 100 includes an antenna radiating unit 101, an antenna feed line 102 and an antenna grounding layer 103, wherein the antenna radiating unit 101 is connected to the antenna grounding layer 103 via the antenna feed line 102;

[0039] A first stop-band ring 1011 is arranged on the antenna radiation unit 101, and the first stop-band ring 1011 is a slot structure;

[0040] The first stopband ring 1011 is used to suppress signals of a first target frequency, where the first target frequency is adjacent to or overlaps with a working frequency band of the flexible antenna 100 .

[0041] In the embodiments of the present application, considering that the internal space of electronic devices such as mobile phones is limited, the antenna design needs to be highly integrated and miniaturized. Therefore, the present application designs a miniaturized flexible antenna structure, including a flexible antenna 100. In specific implementation, the radiating part of the flexible antenna 100 can be made of flexible materials such as a flexible printed circuit (FPC).

[0042] The flexible antenna 100 may be a planar monopole antenna, which is composed of a radiating metal patch, a dielectric plate, a feeding network and a ground plane. The radiating patch and the ground plane may take various shapes, such as a triangle, a rectangle, a circle, etc. A simple design method is to make the length of the radiator 1 / 4 of the wavelength corresponding to the working frequency band to achieve resonance.

[0043] likeFigure 1a and Figure 1b As shown in Figure 1a and Figure 1b , the flexible antenna 100 includes an antenna radiation unit 101, an antenna feeder 102, and an antenna ground layer 103. The lower end of the antenna radiation unit 101 is connected to the lower part of the antenna ground layer 103 through the antenna feeder 102. The antenna feeder 102 is used to realize the feeding function of the antenna radiation unit 101. The antenna radiation unit 101 is in the form of FPC. The antenna ground layer 103 can be a ground plane shared with the main board of the electronic device, as long as the clearance of the FPC antenna is ensured. Among them, Figure 1a and Figure 1b are respectively the front and back schematic diagrams of the flexible antenna.

[0044] The operating frequency band of the flexible antenna 100 is designed according to actual requirements and scenarios. For example, when designed as a cellular LTE antenna, the frequency band range needs to cover 1.71 GHz to 2.7 GHz. Specifically, by adjusting parameters such as the length and radius of the antenna radiation unit 101, the operating frequency of the flexible antenna 100 can be achieved in the range of 1.7 GHz to 2.7 GHz. The relationship between the antenna reflection coefficient of the flexible antenna 100 and the frequency is as shown in Figure 3 shown.

[0045] As Figure 2a and Figure 2b shown, a first stopband ring 1011 is arranged on the antenna radiation unit 101. The first stopband ring 1011 is a slot structure, that is, it is equivalent to making a slot design on the antenna radiation unit 101, and a slot structure is opened on the antenna radiation unit 101 as the antenna stopband ring to suppress signals of specific frequencies. When specifically implemented, it can be achieved through an etching process, that is, the stopband ring is directly etched on the antenna radiation unit 101. By adjusting the shape and size of the first stopband ring 1011, the frequency of the first stopband ring 1011 can be set to the required frequency. Among them, Figure 2a and Figure 2b are respectively the front and back schematic diagrams of the antenna structure provided with the stopband ring.

[0046] For easy understanding, the working principle of the stopband ring is described here:

[0047] The stopband ring is a miniaturized resonator based on the metamaterial structure, which is usually used in antenna design and microwave circuits. It is the complementary structure of the Split-Ring Resonator (SRR), and is realized by etching specific slot patterns on the metal plane. The stopband ring forms an equivalent LC resonance circuit by etching specific slot patterns on the metal plane. When electromagnetic waves pass through the stopband ring structure, resonance will occur at a specific frequency, thereby realizing the suppression of signals at specific frequencies. The resonance frequency of the stopband ring is determined by its geometric size and material properties. Integrating the stopband ring structure into the antenna can realize the filtering function and improve the frequency selectivity of the antenna.

[0048] In the embodiment of the present application, the first stopband ring 1011 is used to suppress signals of the first target frequency, and the first target frequency is adjacent to or overlaps with the operating frequency band of the flexible antenna 100. For example, the first target frequency is close to the edge frequency of the operating frequency band of the flexible antenna 100, or the first target frequency is a certain frequency in the operating frequency band of the flexible antenna 100. The first target frequency may be the operating frequency of another antenna of the electronic device. In this way, the flexible antenna 100 can suppress the antenna signal interference that partially overlaps or is adjacent to its operating frequency band.

[0049] Optionally, the operating frequency band of the flexible antenna 100 is 1.7 GHz to 2.7 GHz, and the first target frequency is 2.45 GHz.

[0050] That is, in some embodiments, the operating frequency band of the flexible antenna 100 can be designed to cover 1.7 GHz to 2.7 GHz and be used as a cellular LTE antenna. The frequency of the first stopband ring 1011 is set to 2.45 GHz, that is, it is used to suppress signals of 2.45 GHz. In this way, when the flexible antenna 100 operates in the B40 / B41 frequency band, the first stopband ring 1011 can suppress the WIFI 2.4G signal, thereby improving the isolation between the LTE antenna and WIFI 2.4G and avoiding adjacent frequency interference.

[0051] Optionally, the antenna radiation unit 101 is a circular structure or a circular segment structure with a notch at the top, and the radius and longitudinal length of the antenna radiation unit 101 are related to the operating frequency band of the flexible antenna 100.

[0052] In some embodiments, in order to ensure good antenna performance and reduce the occupation of the layout device space, the antenna radiation unit 101 can be designed as a circular structure or Figure 1a the circular segment structure with a notch at the top as shown.

[0053] To Figure 1a and Figure 1bTaking the shape of the antenna radiation element 101 shown as an example, the antenna radiation element 101 has parameters such as the arc radius Patch_R and the longitudinal length Ls. And the operating frequency band of the flexible antenna 100 is jointly determined by the parameters such as the radius Patch_R and the longitudinal length Ls of the antenna radiation element 101. Specifically, the radius Patch_R of the antenna radiation element 101 greatly affects the operating bandwidth and resonance depth of the flexible antenna 100. The larger the radius Patch_R, the lower the resonance frequency; the smaller the radius Patch_R, the higher the resonance frequency. The larger the longitudinal length Ls, the lower the resonance frequency; the smaller the longitudinal length Ls, the higher the resonance frequency. That is to say, the radius Patch_R of the antenna radiation element 101 has a negative correlation with the operating frequency of the flexible antenna 100, and the longitudinal length Ls of the antenna radiation element 101 also has a negative correlation with the operating frequency of the flexible antenna 100.

[0054] Optionally, the antenna ground layer 103 is rectangular or rounded rectangular, or two corners of the antenna ground layer 103 on the side close to the antenna radiation element 101 are arc corners.

[0055] In some embodiments, the antenna ground layer 103 can be designed as rectangular or rounded rectangular, or can also be designed as Figure 1a the half rounded rectangular design shown. Adopting the arc corner design structure can make the performance of the flexible antenna 100 better.

[0056] In addition, it should be noted that as Figure 1a and Figure 1b shown, the flexible antenna 100 also includes parameters such as the width Width of the antenna substrate, the length Length of the antenna substrate, the length L of the antenna feeder 102, the width ws of the antenna feeder 102, the arc corner radius R of the antenna ground layer 103, and the longitudinal length Lg of the antenna ground layer 103. Among them, Width and Length have little influence on the performance of the flexible antenna 100 and are dimensions used to limit the size of the flexible antenna 100. Lg is the size of the antenna ground layer 103 and has no direct relationship with the operating frequency of the flexible antenna 100, but it needs to be designed in combination with Patch_R; L, ws, and R are bandwidth optimization items of the flexible antenna 100, and appropriate dimensions can be selected according to the specific operating frequency of the antenna, and there is no direct linear relationship with the operating frequency of the flexible antenna 100.

[0057] Optionally, the first stopband ring 1011 is an arc-shaped slit structure, and the inner arc length and inner arc radius of the first stopband ring 1011 are related to the first target frequency.

[0058] In some embodiments, the first stopband ring 1011 can be designed as Figure 2a and Figure 2b the arc-shaped slit structure shown, that is, in Figure 1a and Figure 1bBased on the shown antenna structure, an arc-shaped slot is added to the radiation patch, i.e., the antenna radiation element 101, and the original parameters of the flexible antenna 100 remain unchanged.

[0059] It should be specifically noted that, in some possible embodiments, the inner arc length and the outer arc length of the first stopband ring 1011 are equal, that is, the arc-shaped slot is not a standard arc, but an equal-arc design, and the inner arc length and the outer arc length of the slot are equal. This can ensure that variables can be more conveniently controlled during the design and simulation process to adjust the slot parameters to meet the antenna stopband design requirements. The parameters of the arc-shaped slot include the inner arc radius Rs1 of the stopband ring, the outer arc radius Rs2 of the stopband ring, the inner arc length a1 of the stopband ring, the outer arc length a2 of the stopband ring, etc. By adjusting the slot parameters of the stopband ring, the resonance frequency of the first stopband ring 1011 can be made at the first target frequency, thereby suppressing the signal of the first target frequency. The relationship between the voltage standing wave ratio (VSWR) of the first stopband ring 1011 and the frequency is as Figure 4 shown.

[0060] Specifically, the frequency of the first stopband ring 1011 has a direct relationship with the length of its arc-shaped slot. The longer the size of the arc-shaped slot, the lower its resonance frequency. In combination with the specific slot parameters Rs1, Rs2, a1, and a2, the relationship with the resonance frequency is that the larger Rs1 and a1 are, the lower the resonance frequency of the first stopband ring 1011, that is, the inner arc radius Rs1 of the stopband ring and the inner arc length a1 of the stopband ring have a negative correlation with the first target frequency. In addition, Rs2, a2 and Rs1, a1 are designed in a matching manner, and it is only necessary to ensure that a1 and a2 are equal. These two groups of parameters affect the bandwidth of the stopband ring. Specifically, the narrower the slot, the narrower the bandwidth.

[0061] In this way, in this embodiment, it is possible to conveniently design a stopband ring with the required stopband frequency by controlling parameters such as the arc length and radius of the slot.

[0062] In some possible embodiments, the lengths of the inner arc and the outer arc may also be different. The specific parameters of the inner arc radius Rs1 of the stopband ring, the outer arc radius Rs2 of the stopband ring, the inner arc length a1 of the stopband ring, and the outer arc length a2 of the stopband ring can be selected based on requirements, and the present application does not make specific limitations on this.

[0063] Optionally, the first stopband ring 1011 is an arc-shaped slot structure, and the opening of the arc-shaped slot structure faces the antenna feeder 102 or the side away from the antenna feeder 102.

[0064] That is, in some embodiments, the first stopband ring 1011 can be designed as Figure 2a the shown arc-shaped slot structure, and the opening of the arc-shaped slot structure can face the antenna feeder 102 and the antenna ground layer 103.

[0065] In some possible embodiments, the opening of the arc-shaped slit structure may also face the opposite side, that is, the side away from the antenna feeder 102. That is, the structural form of the first stopband ring 1011 on the antenna radiation unit 101 can be flexibly designed in various ways.

[0066] Optionally, the first stopband ring 1011 is a symmetric slit structure, or the first stopband ring 1011 includes two symmetric slit structures.

[0067] That is, in some embodiments, in order to ensure the performance of the stopband ring, it can be designed as a symmetric slit structure, and the slit structure can be circular arc-shaped or an approximately arc-shaped structure with an irregular shape. Exemplarily, the first stopband ring 1011 can adopt, for example, Figure 2a the left-right symmetric arc-shaped slit structure shown, or can also adopt, for example, Figure 5a the gradually changing symmetric slit structure shown in and Figure b, where, Figure 5a and Figure 5b are respectively the front and back schematic views of the antenna structure provided with the stopband ring. Of course, the first stopband ring 1011 can also be designed as a symmetric slit structure in various forms on the basis of the Figure 2a or Figure 5a structure.

[0068] In addition, the first stopband ring 1011 can be a long slit structure, or can be two symmetric slit structures. For example, it is designed as the two left-right symmetric slit structures shown in Figure 6a and Figure 6b where, Figure 6a and Figure 6b are respectively the front and back schematic views of the antenna structure provided with the stopband ring.

[0069] It should be noted that by adjusting the slit width of the first stopband ring 1011, its stopband width can be changed, and it can be specifically designed according to actual requirements.

[0070] Optionally, a second stopband ring 1012 is also arranged on the flexible antenna 100. The second stopband ring 1012 is a slit structure. A part of the second stopband ring 1012 is located on the antenna radiation unit 101, and another part of the second stopband ring 1012 is located on the antenna feeder 102. The second stopband ring 1012 does not overlap with the first stopband ring 1011.

[0071] The second stopband ring 1012 is used to suppress the signal of the second target frequency, and the length of the second stopband ring 1012 is related to the second target frequency.

[0072] The stopband ring has a compact structure and is suitable for miniaturized antenna designs. By designing different stopband ring structures, multi-band operation of the antenna can be achieved. Therefore, in some embodiments, another stopband ring can be disposed on the flexible antenna 100 to implement a double stopband ring structure, enabling the flexible antenna 100 to have double stopband characteristics to improve the isolation between multiple different frequency bands.

[0073] Specifically, as Figure 7a and Figure 7b shown, a second stopband ring 1012 can be etched between the antenna radiation element 101 and the antenna feeder 102. That is, a part of the second stopband ring 1012 is located on the antenna radiation element 101, and another part is located on the antenna feeder 102, and the position of the second stopband ring 1012 is separated from that of the first stopband ring 1011, and there is no overlap between them. Among them, Figure 7a and Figure 7b are respectively the front and back schematic diagrams of the antenna structure with two stopband rings.

[0074] The second stopband ring 1012 is used to suppress signals of the second target frequency. The first target frequency and the second target frequency can be the operating frequencies of other different antennas of the electronic device respectively. The second stopband ring 1012 is also a slot structure, and its shape may not be specifically limited. The length of the second stopband ring 1012 can be determined according to the second target frequency to be specifically suppressed. The relationship between the length of the second stopband ring 1012 and the frequency can be negatively correlated, that is, the larger the slot length of the second stopband ring 1012, the lower the corresponding stopband frequency.

[0075] In this way, by designing the flexible antenna 100 with a double stopband ring structure, signals of multiple frequency bands can be suppressed, and the isolation when multiple frequency bands coexist can be improved.

[0076] It should be noted that the geometric dimensions and shapes of the first stopband ring 1011 and the second stopband ring 1012 are not limited to the illustrated structures, but can be flexibly adjusted to meet different design requirements. The width of the stopband ring affects the performance of the stopband, that is, the depth of the antenna S parameter. Therefore, there is no direct limit on the width of the stopband ring slot, but it cannot be too wide, and it is necessary to ensure that it is a slot structure.

[0077] Optionally, the second target frequency is 5.8 GHz.

[0078] In some embodiments, the frequency bands of the two stop bands can be set to 2.4 GHz and 5.8 GHz to effectively avoid the antenna isolation of the cellular and WIFI 2.4G / 5G frequency bands. That is, the frequency of the second stop band 1012 can be set to 5.8 GHz to suppress the signal of the 5.8 GHz frequency. In this way, when the flexible antenna 100 operates in the B40 / B41 frequency bands, the WIFI 2.4G signal can be suppressed by the first stop band 1011, and the WIFI 5.8G signal can be suppressed by the second stop band 1012, thereby improving the isolation between the LTE antenna and WIFI 2.4G and WIFI 5.8G and suppressing the signal interference during multi-band coexistence.

[0079] During specific implementation, as long as the parameters of the two stop bands such as length, arc length, radius, etc. are adjusted in detail, the antenna design of the stop bands for the 2.4 GHz and 5.8 GHz frequency bands can be achieved. The relationship between the antenna standing wave ratio and the frequency is as Figure 8 shown.

[0080] Optionally, the second stop band 1022 is an inverted U-shaped slot structure.

[0081] In some embodiments, in order to ensure good stop band performance, the second stop band 1022 can be designed as an inverted U-shaped slot structure as Figure 7a shown. The relationship between the size of the inverted U-shaped slot structure and the frequency is that the longer the length of the U-shaped slot, the lower the corresponding stop band frequency. The position of the inverted U-shaped slot has little effect on the stop band frequency.

[0082] It should be noted that in the design optimization process of the dual-stop band flexible antenna in the embodiments of the present application, the stop band characteristics of the two slots are mainly optimized. During the actual parameter scanning process, it is found that the two stop bands have basically no influence on the ultra-wideband characteristics of the original antenna, and the parameters between the two stop bands are independent of each other. Therefore, in this design, the structural dimensions of the original ultra-wideband antenna and the structural parameters of the two slots are not changed.

[0083] Optionally, the slot length of the first stop band 1011 is equal to 1 / 4 of the wavelength corresponding to the first target frequency, and the slot length of the second stop band 1012 is equal to 1 / 4 of the wavelength corresponding to the second target frequency.

[0084] That is, in some embodiments, in order to design the required stop band frequency, the overall length of the slot of the stop band can be designed to approach 1 / 4 of the wavelength corresponding to the required target frequency. The stop band width can be changed by adjusting the slot width.

[0085] Optionally, as Figure 9a and Figure 9bAs shown, the flexible antenna 100 includes two antenna radiation units 101. The antenna structure further includes a power divider 104. The antenna feed lines 102 of the two antenna radiation units 101 are respectively connected to the two output terminals of the power divider 104.

[0086] That is, in some embodiments, in order to improve the antenna performance, two antenna radiation units can be connected together through a power divider on the basis of a single antenna, and the antenna directivity can be optimized.

[0087] Such as Figure 9a and Figure 9b As shown, two antenna radiation units 101 with the same structure can be designed. A stopband ring is added to each of the two antenna radiation units 101, so that the single-stopband characteristic can be maintained. The two antenna radiation units 101 are connected together through a power divider 104, so that the transmitted signal can be distributed to the two antenna radiation units 101 by the power divider 104 for transmission respectively, improving the antenna gain. Among them, Figure 9a and Figure 9b are respectively the front and back schematic diagrams of the antenna structure connecting two antenna radiation units through a power divider.

[0088] In the embodiments of the present application, the antenna structure includes: a flexible antenna; the flexible antenna includes an antenna radiation unit, an antenna feed line and an antenna ground layer. The antenna radiation unit is connected to the antenna ground layer through the antenna feed line; a first stopband ring is arranged on the antenna radiation unit, and the first stopband ring is a slot structure; the first stopband ring is used to suppress the signal of the first target frequency, and the first target frequency is adjacent to or overlaps with the operating frequency band of the flexible antenna. In this way, by designing a stopband ring with a slot structure on the flexible antenna to suppress the adjacent frequency interference of the target frequency, the antenna performance can be effectively improved, and the communication service quality of the electronic device can be guaranteed.

[0089] The embodiments of the present application further provide an electronic device, including:

[0090] A housing;

[0091] An antenna structure, and the antenna structure is the antenna structure according to the foregoing embodiments.

[0092] Specifically, the position where the antenna structure is arranged in the electronic device 200 can be as Figure 10 shown, that is, the flexible antenna 100 can be arranged as the ANT13 antenna in the upper right corner of the electronic device 200.

[0093] The electronic device can implement each implementation manner in the foregoing antenna structure embodiments and can achieve the same beneficial effects, which will not be elaborated here.

[0094] Other components of the electronic device according to the embodiments of the present application, such as the radio frequency module and the main board, etc., and operations are known to those of ordinary skill in the art, and will not be described in detail here.

[0095] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An antenna structure, characterized in that, including a flexible antenna; The flexible antenna includes an antenna radiation unit, an antenna feeder, and an antenna ground layer, and the antenna radiation unit is connected to the antenna ground layer through the antenna feeder; A first stop band ring is disposed on the antenna radiation unit, and the first stop band ring is a slot structure; The first stop band ring is used to suppress signals of a first target frequency, and the first target frequency is adjacent to or overlaps with the operating frequency band of the flexible antenna.

2. The antenna structure according to claim 1, wherein, The antenna radiation unit is a circular structure or a circular segment structure with a notch at the top, and the radius and longitudinal length of the antenna radiation unit are related to the operating frequency band of the flexible antenna.

3. The antenna structure according to claim 1, characterized in that, The antenna ground layer is rectangular or has rounded corners, or two corners of the antenna ground layer close to the antenna radiation unit are arc-shaped corners.

4. The antenna structure according to claim 1, characterized in that, The first stop band ring is an arc-shaped slot structure, and the inner arc length and inner arc radius of the first stop band ring are related to the first target frequency.

5. The antenna structure according to claim 1, characterized in that, The first stop band ring is an arc-shaped slot structure, and the opening of the arc-shaped slot structure faces the antenna feeder or faces away from the antenna feeder.

6. The antenna structure according to any one of claims 1 to 3, characterized in that, The first stop band ring is a symmetric slot structure, or the first stop band ring includes two symmetric slot structures.

7. The antenna structure according to any one of claims 1 to 5, characterized in that A second stop band ring is also disposed on the flexible antenna, the second stop band ring is a slot structure, a part of the second stop band ring is located on the antenna radiation unit, another part of the second stop band ring is located on the antenna feeder, and the second stop band ring does not overlap with the first stop band ring; The second stop band ring is used to suppress signals of a second target frequency, and the length of the second stop band ring is related to the second target frequency.

8. The antenna structure according to claim 7, wherein, The second stop band ring is an inverted U-shaped slot structure.

9. The antenna structure according to claim 7, wherein, The slot length of the first stop band ring is equal to 1 / 4 of the wavelength corresponding to the first target frequency, and the slot length of the second stop band ring is equal to 1 / 4 of the wavelength corresponding to the second target frequency.

10. The antenna structure according to any one of claims 1 to 5, characterized in that, The flexible antenna includes two of the antenna radiation units, the antenna structure further includes a power divider, and the antenna feeders of the two antenna radiation units are respectively connected to two output ends of the power divider.

11. The antenna structure according to any one of claims 1 to 5, characterized in that, The operating frequency band of the flexible antenna is 1.7 GHz to 2.7 GHz, and the first target frequency is 2.45 GHz.

12. The antenna structure according to claim 7, wherein The second target frequency is 5.8 GHz.

13. An electronic device, characterized in that, Comprising: a housing; an antenna structure, the antenna structure being the antenna structure according to any one of claims 1 to 12.

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