Filter antenna and electronic device

Abstract

The present disclosure provides a filtering antenna and an electronic device, and belongs to the technical field of antennas. The filtering antenna comprises a first dielectric layer, a first conductor layer and a feeding structure arranged on two sides of the first dielectric layer respectively; the first conductor layer is provided with a first slit and a second slit, the first slit is located in the middle of the first conductor layer, and the first slit is a non-symmetrical structure; the feeding structure comprises an excitation port and a feeding line, the excitation port is located at a first edge of the first dielectric layer, one end of the feeding line is electrically connected with the excitation port, and the other end of the feeding line extends into a region corresponding to the first slit; and the second slit is located between the first slit and the first edge. The filtering antenna of the present disclosure realizes circular polarization radiation characteristics and can cover a working frequency range of 26.10GHz-34.78GHz.

Description

Technical Field

[0001] This disclosure relates to the field of antenna technology, and in particular to a filter antenna and electronic device. Background Technology

[0002] With the rapid development of millimeter-wave communication technology, wireless communication modules for electronic devices are moving towards miniaturization, high integration, and high efficiency. For crucial components of wireless communication modules—antennas and filters—to achieve better integration and miniaturization, they are being designed as a single module: the filering antenna (filtenna).

[0003] In related technologies, the design of filter antennas usually focuses on linearly polarized antennas, while circularly polarized antennas, which have better directivity and higher energy efficiency, are difficult to implement. This is because circularly polarized antennas have a narrow bandwidth, complex structure, and are difficult to integrate. Summary of the Invention

[0004] This disclosure provides a filter antenna and electronic device that can solve the problem that circularly polarized antennas cannot be integrated with filters to realize filter antennas.

[0005] The technical solution is as follows:

[0006] On the one hand, a filter antenna is provided, the filter antenna comprising: a first dielectric layer, and a first conductor layer and a feeding structure respectively disposed on both sides of the first dielectric layer;

[0007] The first conductor layer has a first gap and a second gap, the first gap is located in the middle of the first conductor layer, and the first gap has an asymmetrical structure;

[0008] The power supply structure includes an excitation port and a power supply line. The excitation port is located at the first edge of the first dielectric layer. One end of the power supply line is electrically connected to the excitation port, and the other end of the power supply line extends into the area corresponding to the first gap.

[0009] The second gap is located between the first gap and the first edge.

[0010] In some embodiments, the first gap is rectangular, and a first disturbance piece and a second disturbance piece are provided in the first gap;

[0011] The first disturbance piece and the second disturbance piece are respectively arranged in two of the four opposite corners of the first gap, and are respectively electrically connected to the first conductor layer.

[0012] In some embodiments, the first disturbance piece and the second disturbance piece are both rectangular and have different areas.

[0013] In some embodiments, the area of ​​the first gap is S0, the area of ​​the first disturbance piece is S1, the area of ​​the second disturbance piece is S2, and the area of ​​the second gap is S3.

[0014] The quality factor Q of the filter antenna is inversely proportional to the sum of the areas S1+S2+S3 of the first disturbance piece, the second disturbance piece, and the second slot.

[0015] The quality factor Q of the filtered antenna is proportional to the area S0 of the first gap.

[0016] In some embodiments, the dimension of the first gap along the first direction is L1, and the dimension of the first gap along the second direction is L2;

[0017] The dimension of the first disturbance piece along the first direction is L3, and the dimension of the first disturbance piece along the second direction is L4;

[0018] The second disturbance piece has a dimension of L5 along the first direction and a dimension of L6 along the second direction;

[0019] The following conditions are met: the value range of L3 / L1 is 0.5-0.7, the value range of L4 / L2 is 0.1-0.3; the value range of L5 / L1 is 0.15-0.35, and the value range of L6 / L2 is 0.2-0.4.

[0020] Wherein, the first direction is the extension direction of the feeder wire, and the second direction is perpendicular to the first direction.

[0021] In some embodiments, the first disturbance piece and the second disturbance piece satisfy the following conditions: the value range of L3 / L5 is 2-3, and the value range of L4 / L6 is 0.5-0.7.

[0022] In some embodiments, the dimension of the first gap along the first direction is L1, and the dimension of the first gap along the second direction is L2;

[0023] The dimension of the first conductor layer along the first direction is L7, and the dimension of the first conductor layer along the second direction is L8;

[0024] The values ​​of L1 / L7 are satisfied, ranging from 0.23 to 0.43, and the values ​​of L2 / L8 are satisfied, ranging from 0.15 to 0.25.

[0025] Wherein, the first direction is the extension direction of the feeder wire, and the second direction is perpendicular to the first direction.

[0026] In some embodiments, the dimension of the second gap along the first direction is L9, and the dimension of the second gap along the second direction is L10;

[0027] The value of L9+L10 is satisfied, and the range is 2.4mm-4.4mm.

[0028] In some embodiments, the filter antenna further includes a periodic structure layer and a second dielectric layer, wherein the second dielectric layer is located on the side of the feed structure opposite to the first dielectric layer, and the periodic structure layer is located on the side of the second dielectric layer opposite to the feed structure.

[0029] In some embodiments, the periodic structure layer includes a patch array layer, a third dielectric layer, and a second conductor layer stacked together;

[0030] The patch array layer is located on the side of the third dielectric layer facing the second dielectric layer, and the second conductor layer is located on the side of the third dielectric layer away from the second dielectric layer;

[0031] Each patch unit in the patch array layer penetrates the third dielectric layer through a metal via along the stacking direction to electrically connect to the second conductor layer.

[0032] On the other hand, an electronic device is provided, which includes the filtered antenna described in this disclosure.

[0033] The beneficial effects of the technical solution provided in this disclosure include at least the following:

[0034] The filter antenna disclosed herein utilizes asymmetrical first and second slots to achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, enabling it to cover the operating frequency band of 26.10GHz-34.78GHz, thus covering the 5G frequency band used by mobile phones and other electronic devices. In addition, the filter antenna disclosed herein has a simple structure, and based on processing, integration, and packaging, it solves the problem of complex structure of filter antennas. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is an exploded view of the structure of the filter antenna provided in the embodiments of this disclosure;

[0037] Figure 2 This is a schematic diagram of the structure of the first conductor layer provided in an embodiment of this disclosure;

[0038] Figure 3 This is a schematic diagram of the periodic structure layer provided in the embodiments of this disclosure;

[0039] Figure 4 This is a performance test diagram of the filter antenna provided in an embodiment of this disclosure.

[0040] The reference numerals in the figure are respectively:

[0041] 1. First dielectric layer; 11. First edge;

[0042] 2. First conductor layer; 21. First gap; 211. First disturbance piece; 212. Second disturbance piece; 22. Second gap;

[0043] 3. Power supply structure; 31. Excitation port; 32. Power supply line;

[0044] 4. Periodic structure layer; 41. Patch array layer; 42. Third dielectric layer; 43. Second conductor layer; 44. Metal via;

[0045] 5. Second dielectric layer. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. 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.

[0047] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this disclosure and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0048] Unless otherwise defined, all technical terms used in the embodiments of this disclosure have the same meaning as commonly understood by one of ordinary skill in the art.

[0049] The wireless communication module mainly consists of three parts: an antenna, a radio frequency (RF) front-end, and a main chip. It is used for the mutual conversion between binary signals and radio electromagnetic wave signals during signal transmission and reception: converting binary signals into high-frequency radio electromagnetic wave signals during transmission; and converting received electromagnetic wave signals into binary digital signals during reception. Among these, the filter is a key component of the RF front-end.

[0050] The function of an antenna is to transmit and receive electromagnetic wave signals. The function of a filter is to select frequencies and filter out unwanted out-of-band spurious signals, thereby effectively improving the anti-interference capability of the entire mobile communication system. Therefore, improving the performance of both can improve the transmission efficiency and communication quality of the wireless communication module. For better integration and miniaturization, the antenna and filter are integrated into a single module—the filter antenna—which has received widespread attention in the industry.

[0051] Circularly polarized antennas can receive electromagnetic waves in any polarization direction, which reduces energy loss caused by polarization mismatch. Therefore, they are widely used in mobile phone navigation. However, most current designs for filtering antennas focus on antennas with linear polarization performance, while designing filtering antennas with circular polarization performance is more difficult, making it impossible to realize many of the advantages of circular polarization in filtering antennas.

[0052] Therefore, this disclosure provides a filter antenna that achieves wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, and can cover the operating frequency band of 26.10GHz-34.78GHz, so that the filter antenna covers the 5G frequency band used by mobile phones and other electronic devices.

[0053] The technical solutions provided in this disclosure are applicable to electronic devices employing one or more of the following communication technologies: Bluetooth (BT) communication technology, Global Positioning System (GPS) communication technology, Wireless Fidelity (WiFi) communication technology, Global System for Mobile Communications (GSM) communication technology, Wideband Code Division Multiple Access (WCDMA) communication technology, Long Term Evolution (LTE) communication technology, 5G communication technology, and other future communication technologies.

[0054] The electronic devices in this disclosure can be mobile phones, tablets, laptops, smart bracelets, smartwatches, smart helmets, smart glasses, etc. Electronic devices can also be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, electronic devices in 5G networks, or electronic devices in future evolved Public Land Mobile Networks (PLMNs), etc., and this disclosure does not limit these categories.

[0055] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0056] On the one hand, combined with Figure 1 , 2 As shown, this embodiment provides a filter antenna, which includes: a first dielectric layer 1, a first conductor layer 2 and a feeding structure 3 respectively arranged on both sides of the first dielectric layer 1.

[0057] The first conductor layer 2 is provided with a first gap 21 and a second gap 22. The first gap 21 is located in the middle of the first conductor layer 2 and has an asymmetrical structure.

[0058] The power supply structure 3 includes an excitation port 31 and a power supply line 32. The excitation port 31 is located at the first edge 11 of the first dielectric layer 1. One end of the power supply line 32 is electrically connected to the excitation port 31, and the other end of the power supply line 32 extends into the corresponding area of ​​the first gap 21. The second gap 22 is located between the first gap 21 and the first edge 11.

[0059] The filter antenna in this embodiment utilizes the asymmetrical first slot 21 and second slot 22 to achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, which can cover the operating frequency band of 26.10GHz-34.78GHz, enabling the filter antenna to cover the 5G frequency band used by mobile phones and other electronic devices.

[0060] Furthermore, the filter antenna disclosed herein has a simple structure, and based on fabrication, integration, and packaging, it solves the problem of complex structure in filter antennas.

[0061] In this embodiment, the first slot 21 and the second slot 22 can form a perturbation structure. This perturbation structure allows the filter antenna to generate two electric field components with the same amplitude but a 90° phase difference, thereby radiating circularly polarized electromagnetic waves outward. Simultaneously, the second slot 22, located between the first slot 21 and the excitation port 31, can introduce an additional resonant zero, improving the impedance matching of the filter antenna in this embodiment.

[0062] It should be noted that in this embodiment, the first gap 21 is an asymmetric structure, indicating that the first gap 21 is neither an axisymmetric structure nor a point symmetric structure.

[0063] In some possible implementations, the material of the first conductor layer 2 is metallic copper.

[0064] Optionally, the surface of the first dielectric layer 1 is used as a reference surface and filled with metallic copper so that the surface of the first dielectric layer 1 is uniformly and completely covered by metallic copper.

[0065] Alternatively, the first conductor layer 2 is formed by bonding copper foil to the surface of the first dielectric layer 1.

[0066] In some other possible implementations, the power supply structure 3 is printed on the surface of the first dielectric layer 1 using a printing process.

[0067] In some other possible implementations, the first dielectric layer 1 primarily functions as both the antenna radiating layer and the filtering layer. Optionally, it can be made of Rogers 5880 dielectric material with a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.508 mm. This provides advantages such as material machinability and stable application, low electromagnetic loss, and low material cost, which helps control the cost of the filtering antenna.

[0068] For example, the first gap 21 in this embodiment is formed by a combination of basic shape features and additional shape features, giving it asymmetrical characteristics. The basic shape features include, but are not limited to, rectangles, circles, ellipses, triangles, L-shapes, T-shapes, U-shapes, E-shapes, etc., and the additional shape features also include, but are not limited to, rectangles, circles, ellipses, triangles, L-shapes, T-shapes, U-shapes, E-shapes, etc.

[0069] Another example is that the shape of the second slit 22 includes, but is not limited to, rectangle, circle, ellipse, triangle, L-shape, T-shape, U-shape, E-shape, etc.

[0070] Combination Figure 1 , 2 As shown, in some embodiments, the first gap 21 is rectangular, and a first disturbance piece 211 and a second disturbance piece 212 are provided in the first gap 21.

[0071] The first disturbance piece 211 and the second disturbance piece 212 are respectively arranged in two of the four opposite corners of the first gap 21 and are electrically connected to the first conductor layer 2.

[0072] In this embodiment, the first gap 21 is designed as a rectangle, and the first disturbance piece 211 and the second disturbance piece 212 arranged in the two opposite corners of the first gap 21 make the first gap 21 have asymmetrical characteristics, thereby enabling electromagnetic disturbance.

[0073] Compared to other shapes, the rectangular first slot 21 is simpler to design and manufacture, which helps reduce the design and manufacturing difficulty of the filter antenna. Experimental verification shows that the rectangular first slot 21 has a higher center operating frequency, higher bandwidth, and better out-of-band suppression.

[0074] In some possible implementations, each of the first disturbance piece 211 and the second disturbance piece 212 can be formed from a reserved portion after the first conductor layer 2 has been processed by removing material, or it can be formed by assembling with external materials.

[0075] Combination Figure 1 , 2 As shown, in some embodiments, the first disturbance piece 211 and the second disturbance piece 212 are rectangular and have different areas.

[0076] By using a first perturbation plate 211 and a second perturbation plate 212 that are rectangular and have different areas, the first gap 21 can have asymmetric characteristics, thereby radiating circularly polarized electromagnetic waves outward, and having a larger bandwidth and a better out-of-band suppression level.

[0077] In some embodiments, the area of ​​the first slot 21 is S0, the area of ​​the first disturbance piece 211 is S1, the area of ​​the second disturbance piece 212 is S2, and the area of ​​the second slot 22 is S3; wherein, the quality factor Q of the filter antenna is inversely proportional to the sum of the areas of the first disturbance piece 211, the second disturbance piece 212, and the second slot 22, S1+S2+S3; and the quality factor Q of the filter antenna is directly proportional to the area S0 of the first slot 21.

[0078] For example, this embodiment satisfies:

[0079]

[0080] In the above formula, Q is the quality factor of the filter antenna, which is a parameter that measures the loss of the resonant circuit, and δ is a correction factor. The value of δ ranges from 1.8 to 2.2.

[0081] When the first slit 21 and the second slit 22 satisfy the above formula, it can be guaranteed that the electric field components generated by the first disturbance piece 211 and the second disturbance piece 212 have the same amplitude and a phase difference of 90 degrees, so that the first slit 21 can radiate circularly polarized electromagnetic waves outward.

[0082] Combination Figure 2 As shown, in some embodiments, the size of the first gap 21 along the first direction a is L1, and the size of the first gap 21 along the second direction b is L2; ​​the size of the first disturbance piece 211 along the first direction a is L3, and the size of the first disturbance piece 211 along the second direction b is L4; the size of the second disturbance piece 212 along the first direction a is L5, and the size of the second disturbance piece 212 along the second direction b is L6.

[0083] The following conditions are met: the value range of L3 / L1 is 0.5-0.7, the value range of L4 / L2 is 0.1-0.3; the value range of L5 / L1 is 0.15-0.35, and the value range of L6 / L2 is 0.2-0.4.

[0084] Wherein, the first direction a is the extension direction of the feeder line 32, and the second direction b is perpendicular to the first direction a.

[0085] When the dimensions of the first slot 21, the first disturbance piece 211, and the second disturbance piece 212 meet the above-mentioned value range, the filter antenna of this embodiment can achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, and can cover the operating frequency band of 26.10GHz-34.78GHz.

[0086] For example, the value of L3 / L1 can be 0.5, 0.55, 0.6, 0.65, 0.67, 0.7, etc. Optionally, the value of L3 / L1 can be approximately 0.67.

[0087] Another example is that the value of L4 / L2 can be, for example, 0.1, 0.15, 0.2, 0.25, 0.3, etc. Optionally, the value of L4 / L2 can be approximately 0.2.

[0088] Another example is that the value of L5 / L1 can be, for example, 0.15, 0.2, 0.25, 0.3, 0.35, etc. Optionally, the value of L5 / L1 can be approximately 0.25.

[0089] Another example is that the value of L6 / L2 can be, for example, 0.2, 0.25, 0.3, 0.35, 0.4, etc. Optionally, the value of L6 / L2 can be approximately 0.3.

[0090] In some possible implementations, the first gap 21 has a dimension L1 of 4mm-8mm along the first direction a. For example, the value of dimension L1 can be 4mm, 5mm, 6mm, 7mm, 8mm, etc. Optionally, dimension L1 = 6mm.

[0091] The first gap 21 has a dimension L2 along the second direction b of 4mm-8mm. For example, the value of dimension L2 is 4mm, 5mm, 6mm, 7mm, 8mm, etc. Optionally, dimension L2 = 6mm.

[0092] In some possible implementations, the first perturbation piece 211 has a dimension L3 of 2mm-6mm along the first direction a. For example, the value of dimension L3 can be 2mm, 3mm, 4mm, 5mm, 6mm, etc. Optionally, dimension L3 = 4mm.

[0093] The first disturbance piece 211 has a dimension L4 of 0.2mm-2.2mm along the second direction b. For example, the value of dimension L4 can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, etc. Optionally, dimension L4 = 1.2mm.

[0094] In some possible implementations, the second perturbation piece 212 has a dimension L5 of 0.5mm-2.5mm along the first direction a. For example, the value of dimension L5 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, etc. Optionally, dimension L5 = 1.5mm.

[0095] The second disturbance piece 212 has a dimension L6 of 0.8mm-2.8mm along the second direction b. For example, the value of dimension L6 can be 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, etc. Optionally, dimension L6 = 1.8mm.

[0096] In some embodiments, the first perturbation piece 211 and the second perturbation piece 212 satisfy the following conditions: the value range of L3 / L5 is 2-3, and the value range of L4 / L6 is 0.5-1.5. Thus, the filter antenna of this embodiment can achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, and can cover the operating frequency band of 26.10GHz-34.78GHz.

[0097] For example, the values ​​of L3 / L5 can be 2, 2.2, 2.4, 2.6, 2.67, 2.8, 3, etc. Optionally, the value of L3 / L5 is approximately 2.67.

[0098] Another example is that the value of L4 / L6 can be, for example, 0.5, 0.55, 0.6, 0.65, 0.67, 0.7, etc. Optionally, the value of L4 / L6 is approximately 0.67.

[0099] Combination Figure 2 As shown, in some embodiments, the size of the first gap 21 along the first direction a is L1, and the size of the first gap 21 along the second direction b is L2; ​​the size of the first conductor layer 2 along the first direction a is L7, and the size of the first conductor layer 2 along the second direction b is L8.

[0100] The values ​​of L1 / L7 are satisfied, with a range of 0.23-0.43, and the values ​​of L2 / L8 are satisfied, with a range of 0.15-0.25.

[0101] Wherein, the first direction a is the extension direction of the feeder line 32, and the second direction b is perpendicular to the first direction a.

[0102] When the dimensions of the first slot 21, the first disturbance piece 211, and the second disturbance piece 212 meet the above-mentioned value range, the filter antenna of this embodiment can achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, and can cover the operating frequency band of 26.10GHz-34.78GHz.

[0103] For example, the values ​​of L1 / L7 can be 0.23, 0.25, 0.27, 0.3, 0.33, 0.35, 0.4, 0.43, etc. Optionally, the values ​​of L1 / L7 can be between 0.23 and 0.43.

[0104] Another example is that the value of L2 / L8 is, for example, 0.15, 0.17, 0.2, 0.22, 0.25, etc. Optionally, the value of L2 / L8 is approximately 0.2.

[0105] In some possible implementations, the dimension L7 of the first conductor layer 2 along the first direction a is 10mm-20mm. For example, the value of dimension L7 can be 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, etc. Optionally, dimension L7 is 15mm.

[0106] The dimension L8 of the first conductor layer 2 along the second direction b is 6mm-18mm. For example, the value of dimension L8 can be 6mm, 8mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, etc. Optionally, dimension L8 is 12mm.

[0107] Combination Figure 2As shown, in some embodiments, the dimension of the second slot 22 along the first direction a is L9, and the dimension of the second slot 22 along the second direction b is L10; satisfying that the value range of (L9+L10) is 2.4mm-4.4mm. Thus, the filter antenna of this embodiment can achieve wide bandwidth, low profile, and good directivity circular polarization radiation characteristics, and can cover the operating frequency band of 26.10GHz-34.78GHz.

[0108] For example, the second gap 22 is L-shaped. The dimension L9 of the second gap 22 along the first direction a is 0.7mm-2.1mm. For example, 0.7mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.1mm, etc. Optionally, the dimension L9 is 1.4mm.

[0109] The second gap 22 along the second direction b has a dimension L10 of 1mm-3mm. For example, the value of dimension L10 can be 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3.0mm, etc. Optionally, dimension L7 = 2mm.

[0110] In another example, the width D of the second gap 22 ranges from 0.25mm to 1.25mm. For example, the width D can be 0.25mm, 0.5mm, 0.75mm, 1mm, 1.25mm, etc. Optionally, the width D = 0.75mm.

[0111] Combination Figure 1 As shown, in some embodiments, the filter antenna further includes a periodic structure layer 4 and a second dielectric layer 5, the second dielectric layer 5 being located on the side of the feed structure 3 away from the first dielectric layer 1, and the periodic structure layer 4 being located on the side of the second dielectric layer 5 away from the feed structure 3.

[0112] The second dielectric layer 5 serves to isolate the structures on both sides, preventing mutual interference. The periodic structure layer 4 can construct an electromagnetic band gap (EBG) structure at the bottom of the filter antenna, forming a perfect magnetic conductor (PMC) layer. This effectively suppresses plane waves, reduces spatial radiation loss, and solves the problem of spatial resonance. Because the electromagnetic band gap can be "tuned" to a specific frequency, it can suppress excess electromagnetic interference (EMI) and improve electromagnetic compatibility (EMC).

[0113] In some possible implementations, the second dielectric layer 5 is made of Rogers 5880 dielectric material with a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.254 mm. Its main function is to isolate the bottom layer and the top layer so that they do not interfere with each other.

[0114] Combination Figure 3 As shown, in some embodiments, the periodic structure layer 4 includes a patch array layer 41, a third dielectric layer 42, and a second conductor layer 43 arranged in a stacked manner.

[0115] The patch array layer 41 is located on the side of the third dielectric layer 42 facing the second dielectric layer 5, and the second conductor layer 43 is located on the side of the third dielectric layer 42 away from the second dielectric layer 5. Each patch unit in the patch array layer 41 passes through the third dielectric layer 42 along the stacking direction through a metal via 44 to electrically connect to the second conductor layer 43.

[0116] The patch array layer 41 consists of multiple patch units arranged in a periodic array. Each patch unit is electrically connected to the second conductor layer 43 through a metal via 44, thereby forming an electromagnetic bandgap array structure. This structure can serve as a virtual ground plane for a filter antenna, reflecting radiated energy outward and effectively suppressing the formation of surface waves, reducing the loss of radiated energy, and improving the radiation efficiency of the radiator.

[0117] In some possible implementations, the planar shape of the patch unit includes, but is not limited to, circles, rectangles, positive directions, triangles, ellipses, etc.

[0118] For example, the planar shape of the patch unit is circular, and the diameter W of the patch unit ranges from 0.7mm to 2.7mm. Specifically, the diameter W of the patch unit can be, for example, 0.7mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.7mm, etc. Further, the diameter W of the patch unit is 1.7mm.

[0119] In other possible implementations, the center-to-center spacing P between adjacent patch cells ranges from 1.2mm to 3.2mm. Specifically, the center-to-center spacing P between adjacent patch cells can be, for example, 1.2mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.2mm, etc. Further, the center-to-center spacing P between adjacent patch cells can be set to 2.2mm.

[0120] In other possible implementations, the radius r of the metallized hole ranges from 0.25 mm to 0.45 mm. Specifically, the radius r of the metallized hole can be, for example, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, etc. Further, the radius r of the metallized hole is 0.35 mm.

[0121] In other embodiments, the third dielectric layer 42 is made of Rogers 5880 dielectric material with a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.787 mm. Its main function is to provide a high-impedance surface to prevent surface wave propagation.

[0122] The filter antenna disclosed herein has an overall size of 15mm*12mm*1.549mm. Compared with traditional filter antennas, it has a simpler structure and smaller size, making it more suitable for miniaturization and miniaturization scenarios of electronic devices.

[0123] Combination Figure 4 The diagram shows the return loss, axial ratio, and gain of the filter antenna provided in this disclosure. The center operating frequency of the filter antenna is 30.4 GHz, the -10 dB impedance bandwidth is 26.10 GHz to 34.78 GHz (relative bandwidth of 28.6%), the 3 dB axial ratio bandwidth is 27.94 GHz to 30.97 GHz (relative axial ratio bandwidth of 10%), and the gain is approximately 6.36 dBi at 31 GHz.

[0124] The above demonstrates that the filter antenna provided in this disclosure performs well in terms of bandwidth, axial ratio, and gain, surpassing the level of related technologies, and is suitable for 5G millimeter-wave wireless communication systems.

[0125] On the other hand, this embodiment provides an electronic device that includes the filtered antenna of this disclosure.

[0126] The electronic device in this embodiment uses the filtered antenna disclosed herein and has all the beneficial technical effects of all embodiments herein.

[0127] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0128] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0129] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this disclosure.

[0130] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A filter antenna, characterized in that, The filtered antenna includes: a first dielectric layer (1), a first conductor layer (2) and a feeding structure (3) respectively arranged on both sides of the first dielectric layer (1); The first conductor layer (2) is provided with a first gap (21) and a second gap (22). The first gap (21) is located in the middle of the first conductor layer (2) and the first gap (21) has an asymmetrical structure. The power supply structure (3) includes an excitation port (31) and a power supply line (32). The excitation port (31) is located at the first edge (11) of the first dielectric layer (1). One end of the power supply line (32) is electrically connected to the excitation port (31), and the other end of the power supply line (32) extends into the corresponding area of ​​the first gap (21). The second gap (22) is located between the first gap (21) and the excitation port (31). The first gap (21) and the second gap (22) can form a perturbation structure, so that the filter antenna generates two electric fields with the same amplitude and a 90° phase difference. Moreover, the second gap (22) can introduce an additional resonant zero.

2. The filter antenna according to claim 1, characterized in that, The first gap (21) is rectangular, and a first disturbance piece (211) and a second disturbance piece (212) are provided inside the first gap (21); The first disturbance piece (211) and the second disturbance piece (212) are respectively arranged in two of the four opposite corners of the first gap (21) and are electrically connected to the first conductor layer (2).

3. The filter antenna according to claim 2, characterized in that, The first disturbance piece (211) and the second disturbance piece (212) are both rectangular and have different areas.

4. The filter antenna according to claim 2, characterized in that, The area of ​​the first gap (21) is S0, the area of ​​the first disturbance piece (211) is S1, the area of ​​the second disturbance piece (212) is S2, and the area of ​​the second gap (22) is S3. The quality factor Q of the filter antenna is inversely proportional to the sum of the areas S1+S2+S3 of the first perturbation piece (211), the second perturbation piece (212), and the second slot (22). The quality factor Q of the filter antenna is proportional to the area S0 of the first slit (21).

5. The filter antenna according to claim 2, characterized in that, The first gap (21) has a dimension of L1 along the first direction and a dimension of L2 along the second direction; The dimension of the first disturbance piece (211) along the first direction is L3, and the dimension of the first disturbance piece (211) along the second direction is L4; The second disturbance piece (212) has a dimension of L5 along the first direction and a dimension of L6 along the second direction; The following conditions are met: the value range of L3 / L1 is 0.5-0.7, the value range of L4 / L2 is 0.1-0.3; the value range of L5 / L1 is 0.15-0.35, and the value range of L6 / L2 is 0.2-0.

4. Wherein, the first direction is the extension direction of the feeder wire (32), and the second direction is perpendicular to the first direction.

6. The filter antenna according to claim 5, characterized in that, The first disturbance piece (211) and the second disturbance piece (212) satisfy the following conditions: the value range of L3 / L5 is 2-3, and the value range of L4 / L6 is 0.5-0.

7.

7. The filter antenna according to any one of claims 1-6, characterized in that, The first gap (21) has a dimension of L1 along the first direction and a dimension of L2 along the second direction; The first conductor layer (2) has a dimension of L7 along the first direction and a dimension of L8 along the second direction; The values ​​of L1 / L7 are satisfied, ranging from 0.23 to 0.43, and the values ​​of L2 / L8 are satisfied, ranging from 0.15 to 0.

25. Wherein, the first direction is the extension direction of the feeder wire (32), and the second direction is perpendicular to the first direction.

8. The filter antenna according to claim 7, characterized in that, The second gap (22) has a dimension of L9 along the first direction and a dimension of L10 along the second direction; The value of L9+L10 is satisfied, and the range is 2.4mm-4.4mm.

9. The filter antenna according to any one of claims 1-8, characterized in that, The filtered antenna further includes a periodic structure layer (4) and a second dielectric layer (5), the second dielectric layer (5) being located on the side of the feed structure (3) away from the first dielectric layer (1), and the periodic structure layer (4) being located on the side of the second dielectric layer (5) away from the feed structure (3).

10. The filter antenna according to claim 9, characterized in that, The periodic structure layer (4) includes a patch array layer (41), a third dielectric layer (42), and a second conductor layer (43) arranged in a stacked manner; The patch array layer (41) is located on the side of the third dielectric layer (42) facing the second dielectric layer (5), and the second conductor layer (43) is located on the side of the third dielectric layer (42) away from the second dielectric layer (5). Each patch unit in the patch array layer (41) penetrates the third dielectric layer (42) along the stacking direction through a metal via (44) to electrically connect to the second conductor layer (43).

11. An electronic device, characterized in that, The electronic device includes the filtered antenna according to any one of claims 1-10.

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