Broadband wave-transmitting / filtering radiation unit, antenna array and wireless communication equipment

Abstract

The present invention discloses a broadband wave-transmitting / filtering radiating unit, an antenna array, and a wireless communication device. The broadband wave-transmitting / filtering radiating unit includes a radiating portion and a feeding portion. The radiating portion and the feeding portion utilize a coupled feeding method, so that the radiating portion radiates low-frequency electromagnetic wave signals. The radiating portion includes a radiator, on which a surface periodic structure with resistance is loaded. When the radiating portion operates in a first mode, electromagnetic waves excited by the high-frequency radiating unit irradiate the radiating portion, and the radiator and the surface periodic structure with resistance on the radiating portion together form an equivalent spatial bandpass filter circuit. When the radiating portion operates in a second mode, low-frequency electromagnetic waves excite the radiating portion through the feeding portion, and the units of the surface periodic structure with resistance are excited in parallel by the radiator, forming an equivalent filter circuit. The present invention can improve the distortion of the broadband antenna pattern and enhance indicators such as antenna gain, out-of-band suppression, and cross-polarization ratio.

Description

Technical Field

[0001] The present invention relates to a broadband wave-transmitting / filtering radiation unit, an antenna array and wireless communication equipment, belonging to the technical field of mobile communications. Background Art

[0002] Currently, mainstream 5G application frequency bands are generally between 2400-2700MHz and 3300-3800MHz. With the development of 5G communication systems, antenna systems are gradually expanding from narrowband to dual-band (2400-2700MHz & 3300-3800MHz) and even broadband (2400-4200MHz). Consequently, in the engineering application of co-aperture multi-band antennas, more and more antenna arrays of different frequency bands share a single reflective surface, and interference between high- and low-frequency antennas is becoming increasingly serious. Current research focuses on enabling low-frequency radiating elements to transmit broadband waves from high-frequency radiating arrays, as well as on integrated narrowband wave transmission / filtering designs. Substantial progress has yet to be made in broadband wave transmission / filtering designs. Summary of the Invention

[0003] The first purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and provide a broadband wave-transmitting / filtering radiating unit that can improve the deformity of the broadband antenna pattern and improve indicators such as antenna gain, out-of-band suppression, and cross-polarization ratio.

[0004] A second object of the present invention is to provide an antenna array comprising the above-mentioned broadband wave-transmitting / filtering radiating unit.

[0005] A third object of the present invention is to provide a wireless communication device comprising the above antenna array.

[0006] The purpose of the present invention can be achieved by taking the following technical solutions:

[0007] A broadband wave-transmitting / filtering radiating unit includes a radiating portion and a feeding portion. The radiating portion and the feeding portion adopt a coupled feeding method so that the radiating portion radiates low-frequency electromagnetic wave signals outward. The radiating portion includes a radiator, and the radiator is loaded with a surface periodic structure with resistance.

[0008] When the radiating part operates in the first mode, the electromagnetic wave excited by the high-frequency radiating unit irradiates the radiating part, and the radiator on the radiating part and the surface periodic structure with resistance together form an equivalent spatial bandpass filter circuit;

[0009] When the radiating portion operates in the second mode, the low-frequency electromagnetic wave excites the radiating portion through the feeding portion, and the units of the surface periodic structure with resistance are excited by the radiator in parallel to form an equivalent filter circuit.

[0010] Furthermore, the radiator includes four radiating arms, which are arranged on the substrate. The four radiating arms are respectively a first radiating arm, a second radiating arm, a third radiating arm and a fourth radiating arm, wherein two radiating arms constitute the +45° polarization of the broadband wave-transmitting / filtering radiating unit, and the other two radiating arms constitute the -45° polarization of the broadband wave-transmitting / filtering radiating unit.

[0011] Furthermore, each radiating arm includes a plurality of wave-transmitting / filtering units and a feeding block, each wave-transmitting / filtering unit includes a metal straight edge and a wave-transmitting / filtering structure, the metal straight edges of each wave-transmitting / filtering unit are sequentially connected to form a ring-shaped polygon with the feeding block, and the wave-transmitting / filtering structure is one or two;

[0012] When there is one wave-transmitting / filtering structure, the wave-transmitting / filtering structure is located on one side of the metal straight edge;

[0013] When there are two wave-transmitting / filtering structures, the two wave-transmitting / filtering structures are independent of each other, and a single wave-transmitting / filtering structure works together with the metal straight edge, or two wave-transmitting / filtering structures work together with the metal straight edge; when two wave-transmitting / filtering structures work together with the metal straight edge, the two wave-transmitting / filtering structures are respectively located on both sides of the metal straight edge.

[0014] Furthermore, when the two wave-transmitting / filtering structures are respectively located on both sides of the metal straight edge, one of the wave-transmitting / filtering structures is arranged on the top layer of the substrate, and the other wave-transmitting / filtering structure is arranged on the bottom layer of the substrate, or one of the wave-transmitting / filtering structures is arranged on the bottom layer of the substrate, and the other wave-transmitting / filtering structure is arranged on the top layer of the substrate, or the two wave-transmitting / filtering structures are jointly arranged on the top layer of the substrate, or the two wave-transmitting / filtering structures are jointly arranged on the bottom layer of the substrate.

[0015] Furthermore, the feeding block is directly opposite to a wave transmission / filtering unit;

[0016] In the two radiating arms constituting the +45° polarization of the broadband wave-transmitting / filtering radiating unit, the length of the connection line between the feed block and the facing wave-transmitting / filtering unit is 0.44 to 0.5 times the wavelength corresponding to the working center frequency of the broadband wave-transmitting / filtering radiating unit;

[0017] In the two radiating arms constituting the -45° polarization of the broadband wave-transmitting / filtering radiating unit, the length of the connection line between the feed block and the opposite wave-transmitting / filtering unit is 0.22 to 0.25 times the wavelength corresponding to the working center frequency of the broadband wave-transmitting / filtering radiating unit.

[0018] Furthermore, the width of the metal straight edge is 1.5mm-2mm, and each wave-transmitting / filtering structure includes a main line and two L-shaped branches. The main line is parallel to the metal straight edge, and the ends of the main line and each L-shaped branch are connected to an absorption resistor. The resistance value of the absorption resistor is 500-3000 ohms. The total length of each wave-transmitting / filtering structure is one-quarter of the operating wavelength of the corresponding wave-transmitting frequency band, the line width is 1-2mm, and the distance between each wave-transmitting / filtering structure and the metal straight edge is 0.01-0.1 times the wavelength of the corresponding frequency band.

[0019] Furthermore, the width of the metal straight edge is 1.5mm-2mm, each wave-transmitting / filtering structure is a U-shaped structure, the end of the U-shaped structure is connected to an absorption resistor, the resistance value of the absorption resistor is 500-3000 ohms, the total length of each wave-transmitting / filtering structure is one-quarter of the working wavelength of the corresponding wave-transmitting frequency band, the line width is 1-2mm, and the distance between each wave-transmitting / filtering structure and the metal straight edge is 0.01-0.1 times the wavelength of the corresponding frequency band.

[0020] Furthermore, the surface periodic structure is loaded on the radiator through electromagnetic coupling. When the radiating part operates in the second mode, the unit of the surface periodic structure is equivalent to a non-radiating resonator and forms a plurality of non-resonant node structures with the radiator through electromagnetic coupling.

[0021] The second object of the present invention can be achieved by adopting the following technical solutions:

[0022] An antenna array includes a reflector, a low-frequency radiating unit and a high-frequency radiating array. The low-frequency radiating unit is the above-mentioned broadband wave-transmitting / filtering radiating unit. The low-frequency radiating unit and the high-frequency radiating array are distributed on the reflector, and the low-frequency radiating unit is placed in the high-frequency radiating array.

[0023] The third object of the present invention can be achieved by adopting the following technical solutions:

[0024] A wireless communication device comprises the above antenna array.

[0025] The present invention has the following beneficial effects compared to the prior art:

[0026] The broadband wave-transmitting / filtering radiation unit of the present invention has a simple structure. By introducing a wave-transmitting / filtering unit on the radiation portion of the broadband wave-transmitting / filtering radiation unit and arranging the wave-transmitting / filtering unit in a certain manner to form a radiation surface, it is ensured that the radiation unit has good broadband wave-transmitting performance while realizing the function of a filter. It can effectively improve the radiation pattern of the high-frequency radiation array while widening the standing wave bandwidth of the broadband wave-transmitting / filtering radiation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a front view of the broadband wave-transmitting / filtering radiation unit according to embodiment 1 of the present invention.

[0029] Figure 2 This is an equivalent spatial bandpass filtering circuit diagram of the broadband wave-transmitting / filtering radiation unit according to embodiment 1 of the present invention when operating in the first mode.

[0030] Figure 3 This is an equivalent filtering circuit diagram of the broadband wave-transmitting / filtering radiation unit according to embodiment 1 of the present invention when operating in the second mode.

[0031] Figure 4 Schematic diagram of the radiator of the radiating portion of the broadband wave-transmitting / filtering radiating unit according to embodiment 1 of the present invention.

[0032] Figure 5 Schematic diagram of the radiation arm in the radiator of embodiment 1 of the present invention.

[0033] Figure 6 Schematic diagram of the wave-transmitting / filtering unit in the radiation arm according to embodiment 1 of the present invention.

[0034] Figure 7 4 is a diagram showing the wave transmission simulation results of the wave transmission / filtering unit according to Example 1 of the present invention.

[0035] Figure 8 This is a diagram showing the RCS simulation results of the wave-transmitting / filtering unit according to Example 1 of the present invention.

[0036] Figure 9 This is a gain curve diagram of the low-frequency radiation unit of Example 1 of the present invention.

[0037] Figure 10 Schematic diagram of the antenna array according to embodiment 2 of the present invention.

[0038] Figure 11 Schematic diagram of the wave-transmitting / filtering unit in the radiation arm according to embodiment 3 of the present invention.

[0039] Among them, 101-feed block, 102-first wave transmission / filter unit, 103-second wave transmission / filter unit, 104-third wave transmission / filter unit, 105-fourth wave transmission / filter unit, 106-fifth wave transmission / filter unit, 107-sixth wave transmission / filter unit, 108-seventh wave transmission / filter unit, 01-first metal straight edge, 02-first wave transmission / filter structure, 021-first L-shaped branch, 022-second L-shaped branch, 03-second wave transmission / filter Wave structure, 031-third L-shaped branch, 032-fourth L-shaped branch, 041-first absorption resistor, 042-second absorption resistor, 043-third absorption resistor, 044-fourth absorption resistor, 06-first radiation arm, 07-second radiation arm, 08-third radiation arm, 09-fourth radiation arm, 11-second metal straight edge, 12-third wave transmission / filtering structure, 13-fourth wave transmission / filtering structure, 141-fifth absorption resistor, 142-sixth absorption resistor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] Example 1:

[0042] like Figure 1 As shown, this embodiment provides a broadband wave-transmitting / filtering radiation unit. The broadband wave-transmitting / filtering radiation unit is a low-frequency radiation unit, which includes a radiation portion and a feeding portion. The radiation portion and the feeding portion adopt a coupled feeding method, so that the radiation portion radiates low-frequency electromagnetic wave signals outward. The radiation portion includes a radiator, and the radiator is loaded with a surface periodic structure with resistance. The broadband wave-transmitting / filtering radiation unit has two operating modes, namely a first mode and a second mode. When the radiation portion operates in the first mode, as shown in FIG. Figure 2 As shown, the electromagnetic waves excited by the high-frequency radiation unit are irradiated onto the radiation part, and the radiator on the radiation part and the surface periodic structure with resistance together constitute an equivalent spatial band-pass filter circuit. Due to the existence of resistance, the transmission zero point is well suppressed, so that the radiation part is equivalent to a spatial wide-band band-pass filter, and the electromagnetic wave energy excited by the high-frequency radiation unit passes through the low-frequency radiation unit as completely as possible. When the radiation part operates in the second mode, the low-frequency electromagnetic wave excites the radiation part through the feeding part, and the units of the surface periodic structure with resistance are excited by the radiator in a parallel manner, forming an equivalent filter circuit, as shown in FIG. Figure 3As shown, it is a non-resonant node (NRN); specifically, the surface periodic structure is loaded on the radiator through electromagnetic coupling. When the radiating part operates in the second mode, the unit of the surface periodic structure is equivalent to a non-radiating resonator, and forms multiple non-resonant node structures with the radiator through electromagnetic coupling. The non-resonant node structure will generate N radiation zero points, and the frequency of the radiation zero point is the same as the unit resonant frequency of each layer of the surface periodic structure. Therefore, by modulating the unit resonant frequency of the periodic surface, the radiation zero point frequency can be controlled to improve the out-of-band suppression of the antenna. It can be seen that the broadband wave-transmitting / filtering radiating unit of this embodiment realizes the two functions of broadband wave-transmitting and filtering, and can irradiate electromagnetic waves through broadband and high frequency without distortion. At the same time, a radiation zero point is generated at the high-frequency end through the non-resonant node structure, thereby improving the out-of-band suppression of the low-frequency radiating unit to the high frequency.

[0043] like Figure 4 As shown, the radiator of this embodiment includes four radiating arms, which are arranged on the substrate. The four radiating arms are respectively a first radiating arm 06, a second radiating arm 07, a third radiating arm 08 and a fourth radiating arm 09. The first radiating arm 06 and the third radiating arm 08 constitute a -45° polarization of a broadband wave-transmitting / filtering radiating unit, and the second radiating arm 07 and the fourth radiating arm 09 constitute a +45° polarization of a broadband wave-transmitting / filtering radiating unit. The circuit on the radiator can be etched on the top and bottom layers of the substrate using PCB.

[0044] like Figure 4 and Figure 5 As shown, each radiating arm of this embodiment includes seven wave-transmitting / filtering units and a feeding block 101. The seven wave-transmitting / filtering units are a first wave-transmitting / filtering unit 102, a second wave-transmitting / filtering unit 103, a third wave-transmitting / filtering unit 104, a fourth wave-transmitting / filtering unit 105, a fifth wave-transmitting / filtering unit 106, a sixth wave-transmitting / filtering unit 107, and a seventh wave-transmitting / filtering unit 108. The rotation angle between each two adjacent wave-transmitting / filtering units is 30° to 45°.

[0045] Furthermore, in the second radiating arm 07 and the fourth radiating arm 09, the length of the connection between the feed block 101 and the opposite wave-transmitting / filtering unit (i.e., the fourth wave-transmitting / filtering unit 105) is 0.44 to 0.5 times the wavelength corresponding to the operating center frequency of the broadband wave-transmitting / filtering radiating unit; in the first radiating arm 06 and the third radiating arm 08, the length of the connection between the feed block 101 and the opposite wave-transmitting / filtering unit (i.e., the fourth wave-transmitting / filtering unit 105) is 0.22 to 0.25 times the wavelength corresponding to the operating center frequency of the broadband wave-transmitting / filtering radiating unit.

[0046] Furthermore, each wave-transmitting / filtering unit includes a metal straight edge and a wave-transmitting / filtering structure. The metal straight edge and the wave-transmitting / filtering structure can form two wave-transmitting channels in the high-frequency band. The metal straight edges of each wave-transmitting / filtering unit are sequentially connected to form a ring-shaped polygon with the feed block 101, which completely corresponds to the first wave-transmitting / filtering unit 102 and the seventh wave-transmitting / filtering unit 108. There is one wave-transmitting / filtering structure, which is a high-frequency unit and is arranged on one side of the metal straight edge. The second wave-transmitting / filtering unit 103 completely corresponds to the sixth wave-transmitting / filtering unit 107. There are two wave-transmitting / filtering structures, which are a high-frequency unit and a low-frequency unit. The high-frequency unit and the low-frequency unit are arranged on both sides of the metal straight edge and are offset by 5-10 mm. The third wave-transmitting / filtering unit 104, the fourth wave-transmitting / filtering unit 105 and the fifth wave-transmitting / filtering unit 106 have the same structure. There are two wave-transmitting / filtering structures, which are a high-frequency unit and a low-frequency unit. The high-frequency unit and the low-frequency unit are arranged on both sides of the metal straight edge but are not offset. Among them, the two wave-transmitting / filtering structures of the second wave-transmitting / filtering unit 103, the third wave-transmitting / filtering unit 104, the fourth wave-transmitting / filtering unit 105, the fifth wave-transmitting / filtering unit 106 and the sixth wave-transmitting / filtering unit 107 are independent of each other and work together with the metal straight edge.

[0047] Furthermore, the width of the metal straight edge is 1.5mm-2mm, the total length of each wave-transmitting / filtering structure is one-quarter of the working wavelength of the corresponding wave-transmitting frequency band, the line width is 1-2mm, and the distance between each wave-transmitting / filtering structure and the metal straight edge is 0.01-0.1 times the wavelength of the corresponding frequency band.

[0048] like Figure 6As shown, this embodiment is described by taking the third wave transmission / filtering unit 104, the fourth wave transmission / filtering unit 105 and the fifth wave transmission / filtering unit 106 as examples, including a metal straight edge 01, a first wave transmission / filtering structure 02 and a second wave transmission / filtering structure 03. The first wave transmission / filtering structure 02 includes a first main line, a first L-shaped branch 021 and a second L-shaped branch 022. The first main line is parallel to the metal straight edge 01. The ends of the first main line and the first L-shaped branch 021 are connected to a first absorption resistor 041. The ends of the first main line and the second L-shaped branch 022 are connected to a first absorption resistor 042. The second wave transmission / filtering structure 03 includes a first main line, a first L-shaped branch 021 and a second L-shaped branch 022. Structure 03 includes a second main line, a third L-shaped branch 031 and a fourth L-shaped branch 032. The ends of the second main line and the third L-shaped branch 031 are connected to a third absorption resistor 043, and the ends of the second main line and the fourth L-shaped branch 032 are connected to a fourth absorption resistor 044. The resistance value of each absorption resistor is 500-3000 ohms. Through the absorption resistor, the transmission zero point broadband wave transmission can be well suppressed in the wave transmission mode; for the low-frequency radiation unit, the two wave transmission / filtering structures have their own current action and do not radiate energy to the outside, forming two zero points in the high-frequency band, thereby suppressing the radiation of the low-frequency radiation unit in the high-frequency band.

[0049] Furthermore, the first wave-transmitting / filtering structure 02 and the second wave-transmitting / filtering structure 03 are jointly arranged on the top layer of the substrate, but it can be understood that the two wave-transmitting / filtering structures can also be jointly arranged on the bottom layer of the substrate, or the first wave-transmitting / filtering structure 02 is arranged on the top layer of the substrate and the second wave-transmitting / filtering structure 03 is arranged on the bottom layer of the substrate, or the first wave-transmitting / filtering structure 02 is arranged on the bottom layer of the substrate and the second wave-transmitting / filtering structure 03 is arranged on the top layer of the substrate.

[0050] Figure 7 The simulation performance index of the high-frequency electromagnetic wave incident wave irradiating the wave-transmitting / filtering unit of this embodiment and the wave-transmitting / filtering unit of this embodiment is not loaded. The simulation results of this embodiment have two resonance points at 3.54GHz and 2.24GHz. In the entire frequency range of 2GHz-4GHz, S11 is less than -10dB, S 21 It shows that the energy loss of the incident wave after passing through the wave-transmitting unit within the working frequency band is less than 0.01%. From the simulation results, it can be seen that in the 2-4 GHz frequency band, S 21 The S11 of the embodiment without the wave-transmitting / filtering unit is between 0.31-1.2 dB. In contrast, the S11 exhibits obvious resonant circuit characteristics. The S11 is only within the ±50 MHz bandwidth near the resonance point. 11 Less than -10dB, and changes with frequency S 11 Rapidly deteriorates to form a transmission zero, and S 21 It also clearly shows narrowband characteristics.

[0051] Since a single wave-transmitting / filtering unit is a typical broadband resonant circuit, multiple wave-transmitting / filtering units are connected to form a radiation arm for RCS simulation, such as Figure 8 As shown, the RCS value is less than -20dB in the entire 2GHz~4GHz range, indicating that the radiating arm structure has good wave transmission characteristics. Correspondingly, the RCS simulation without the wave transmission / filtering unit of this embodiment can be seen to have an RCS value greater than -20dB in the 2GHz-2.5GHz range, with an obvious zero point at 4.25GHz, and the RCS deteriorates to -10dB.

[0052] Figure 9 This is a gain curve diagram of the low-frequency radiating unit, which includes two curves: a traditional radiating unit and a broadband wave-transmitting / filtering radiating unit of this embodiment. As can be seen from the figure, the low-frequency radiating unit operates in the 0.6-0.96GHz frequency band, and the gain reaches 8dB. The two have a high degree of overlap, indicating that the addition of the wave-transmitting / filtering unit has not affected the radiation characteristics in the low-frequency band. In the 2.4GHz and 3.6GHz frequency bands, two obvious resonance points (zero points) are present, making the gain in the 2.4GHz and 3.6GHz bands less than 0dB, effectively suppressing the radiation of the low-frequency radiating unit in the high-frequency band, showing a filter characteristic.

[0053] Example 2:

[0054] like Figure 10 As shown, this embodiment provides an antenna array, which is a common-aperture antenna array, including a reflector, a low-frequency radiating unit and a high-frequency radiating array. The low-frequency radiating unit is the broadband wave-transmitting / filtering radiating unit of the above-mentioned embodiment 1, and the high-frequency radiating array includes a plurality of high-frequency radiating units. The low-frequency radiating unit and the high-frequency radiating array are distributed on the reflector, and the low-frequency radiating unit is placed in the high-frequency radiating array. The low-frequency radiating unit operates in the 698-960MHz frequency band, and the high-frequency array operates in the 2400-4200MHz frequency band. The high-frequency radiating unit used in the high-frequency array is a dual-polarization dipole unit. When the electromagnetic waves emitted by the high-frequency array are irradiated to the radiating part and the feeding part of the low-frequency radiating unit, the wave-transmitting / filtering unit on the radiating part has a perspective effect on the high-frequency electromagnetic waves.

[0055] Example 3:

[0056] like Figure 11As shown, the wave-transmitting / filtering unit of this embodiment includes a third metal straight edge 11, a third wave-transmitting / filtering structure 12, and a fourth wave-transmitting / filtering structure 13. The third wave-transmitting / filtering structure 12 and the fourth wave-transmitting / filtering structure 13 are both U-shaped structures. A fifth absorption resistor 141 is connected to the end of the third wave-transmitting / filtering structure 12, and a sixth absorption resistor 142 is connected to the end of the fourth wave-transmitting / filtering structure 13. The resistance value of the absorption resistor is 500-3000 ohms. The rest of the content is the same as that of Example 1.

[0057] In summary, the broadband wave-transmitting / filtering radiation unit of the present invention has a simple structure. By introducing a wave-transmitting / filtering unit on the radiation part of the broadband wave-transmitting / filtering radiation unit and arranging the wave-transmitting / filtering unit in a certain manner to form a radiation surface, it is ensured that the radiation unit has good broadband wave-transmitting performance while realizing the function of a filter. It can effectively improve the radiation pattern of the high-frequency radiation array while widening the standing wave bandwidth of the broadband wave-transmitting / filtering radiation unit.

[0058] The above description is only a preferred embodiment of the present invention, but the implementation of the present invention is not limited to the above embodiment. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A broadband wave-transmitting / filtering radiation unit, characterized in that: The device comprises a radiation part and a feeding part, wherein the radiation part and the feeding part adopt a coupled feeding method so that the radiation part radiates low-frequency electromagnetic wave signals outwardly, and the radiation part comprises a radiator, and the radiator is loaded with a surface periodic structure with resistance; When the radiating part operates in the first mode, the electromagnetic wave excited by the high-frequency radiating unit irradiates the radiating part, and the radiator on the radiating part and the surface periodic structure with resistance together form an equivalent spatial bandpass filter circuit; When the radiating portion operates in the second mode, the low-frequency electromagnetic wave excites the radiating portion through the feeding portion, and the units of the surface periodic structure with resistance are excited in parallel by the radiator, forming an equivalent filter circuit; The radiator includes four radiating arms, each radiating arm includes a plurality of wave-transmitting / filtering units and a feeding block, each wave-transmitting / filtering unit includes a metal straight edge and a wave-transmitting / filtering structure, the metal straight edges of each wave-transmitting / filtering unit are sequentially connected to form a ring-shaped polygon with the feeding block, and there are one or two wave-transmitting / filtering structures; When there is one wave-transmitting / filtering structure, the wave-transmitting / filtering structure is located on one side of the metal straight edge; When there are two wave-transmitting / filtering structures, the two wave-transmitting / filtering structures are independent of each other, and a single wave-transmitting / filtering structure works together with the metal straight edge, or two wave-transmitting / filtering structures work together with the metal straight edge; when two wave-transmitting / filtering structures work together with the metal straight edge, the two wave-transmitting / filtering structures are respectively located on both sides of the metal straight edge; The total length of each wave-transmitting / filtering structure is one-quarter of the operating wavelength of the corresponding wave-transmitting frequency band; each wave-transmitting / filtering structure includes a main line and two L-shaped branches, the main line is parallel to the metal straight edge, and the ends of the main line and each L-shaped branch are connected to an absorption resistor, or each wave-transmitting / filtering structure is a U-shaped structure, and the end of the U-shaped structure is connected to an absorption resistor; the resistance value of the absorption resistor is 500-3000 ohms.

2. The broadband wave-transmitting / filtering radiation unit according to claim 1, characterized in that: Four radiating arms are arranged on the substrate, wherein two radiating arms constitute the +45° polarization of the broadband wave-transmitting / filtering radiating unit, and the other two radiating arms constitute the -45° polarization of the broadband wave-transmitting / filtering radiating unit.

3. The broadband wave-transmitting / filtering radiation unit according to claim 2, characterized in that: The feeding block is facing a wave transmission / filtering unit; In the two radiating arms constituting the +45° polarization of the broadband wave-transmitting / filtering radiating unit, the length of the connection line between the feed block and the facing wave-transmitting / filtering unit is 0.44 to 0.5 times the wavelength corresponding to the working center frequency of the broadband wave-transmitting / filtering radiating unit; In the two radiating arms constituting the -45° polarization of the broadband wave-transmitting / filtering radiating unit, the length of the connection line between the feed block and the opposite wave-transmitting / filtering unit is 0.22 to 0.25 times the wavelength corresponding to the working center frequency of the broadband wave-transmitting / filtering radiating unit.

4. The broadband wave-transmitting / filtering radiation unit according to claim 1, characterized in that: When the two wave-transmitting / filtering structures are respectively located on both sides of the metal straight edge, one of the wave-transmitting / filtering structures is arranged on the top layer of the substrate, and the other wave-transmitting / filtering structure is arranged on the bottom layer of the substrate, or one of the wave-transmitting / filtering structures is arranged on the bottom layer of the substrate, and the other wave-transmitting / filtering structure is arranged on the top layer of the substrate, or the two wave-transmitting / filtering structures are arranged on the top layer of the substrate, or the two wave-transmitting / filtering structures are arranged on the bottom layer of the substrate.

5. The broadband wave-transmitting / filtering radiation unit according to claim 1, characterized in that: The width of the metal straight edge is 1.5mm-2mm, the line width of each wave-transmitting / filtering structure is 1-2mm, and the distance between each wave-transmitting / filtering structure and the metal straight edge is 0.01-0.1 times the wavelength of the corresponding frequency band.

6. The broadband wave-transmitting / filtering radiation unit according to any one of claims 1 to 5, characterized in that: The surface periodic structure is loaded on the radiator through electromagnetic coupling. When the radiating part operates in the second mode, the unit of the surface periodic structure is equivalent to a non-radiating resonator and forms a plurality of non-resonant node structures with the radiator through electromagnetic coupling.

7. An antenna array, characterized in that: It includes a reflecting plate, a low-frequency radiation unit and a high-frequency radiation array, wherein the low-frequency radiation unit is the broadband wave-transmitting / filtering radiation unit described in any one of claims 1 to 6, the low-frequency radiation unit and the high-frequency radiation array are distributed on the reflecting plate, and the low-frequency radiation unit is placed in the high-frequency radiation array.

8. A wireless communication device, characterized in that: Comprising the antenna array according to claim 7.

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