Broadband wave-transmitting / filtering low-frequency radiation unit, common-aperture antenna array and communication device

Abstract

Disclosed in the present invention are a broadband wave-transmitting / filtering radiation unit, a common-aperture antenna array and a communication device. The radiation unit comprises a radiation structure and a feed structure, wherein the radiation structure and the feed structure use a coupled feed mode, such that the radiation structure radiates a low-frequency electromagnetic wave signal outwards; the radiation structure comprises a radiator, and multiple layers of surface periodic structures are loaded on the radiator; when the radiation structure operates in a first mode, electromagnetic waves excited by high-frequency radiation units irradiate the radiation structure, and the radiator and the multiple layers of surface periodic structures jointly form a non-resonant node space band-pass filtering circuit having K resonance points and K zero points; and when the radiation structure operates in the second mode, low-frequency electromagnetic waves excite the radiation structure by means of the feed structure, and units of the multiple layers of surface periodic structures are excited by the radiator in a parallel mode, so as to form an equivalent filtering circuit. The present invention can ameliorate the deformity of a multi-band antenna pattern and increase indicators regarding gain and out-of-band rejection of an antenna, a cross polarization ratio thereof, etc.

Description

Broadband wave-transmitting filtering low-frequency radiation unit, common-aperture antenna array and communication equipment Technical Field

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

[0002] With the widespread commercialization of 5G mobile communication systems, array antennas of different frequency bands share a single reflective surface, forming a co-aperture antenna. To reduce the antenna surface area, high-frequency antenna radiators are often placed around low-frequency radiators. The closer the physical distance between the two, the more severe the interference. Interference between high-frequency and low-frequency antenna radiators can be divided into two categories. One is radiation interference, where electromagnetic waves radiated by the high-frequency antenna strike the low-frequency radiator, generating electromagnetic induction there. This stimulates electromagnetic radiation, distorting the radiation pattern of the high-frequency antenna array due to the superposition of the two electromagnetic waves. This type of interference is typically addressed by making the low-frequency radiator transparent to the high-frequency radiator, thereby improving the high-frequency pattern distortion. The other type of interference is self-radiation interference, where low-frequency radiators, in addition to emitting electromagnetic waves within their own operating band, also generate electromagnetic waves within the doubled or tripled frequency bands due to the presence of frequency harmonics. This type of interference is typically addressed through additional filtering circuitry. Currently, integrating transmission / filtering functionality into the radiating surface has not yet been achieved. Summary of the Invention

[0003] In view of this, the present invention provides a broadband wave-transmitting / filtering radiation unit, a common-aperture antenna array and a communication device, which can improve the deformity of the multi-band antenna radiation pattern and enhance the antenna gain, out-of-band suppression and cross-polarization ratio and other indicators.

[0004] A first object of the present invention is to provide a broadband wave-transmitting / filtering radiation unit.

[0005] The second object of the present invention is to provide a common aperture antenna array.

[0006] A third object of the present invention is to provide a mobile communication device.

[0007] The first object of the present invention can be achieved by adopting the following technical solutions:

[0008] A broadband wave-transmitting / filtering radiating unit includes a radiating structure and a feeding structure. The radiating structure and the feeding structure adopt a coupled feeding method so that the radiating structure radiates low-frequency electromagnetic wave signals outward. The radiating structure includes a radiator, and the radiator is loaded with a multi-layer surface periodic structure.

[0009] When the radiating structure operates in the first mode, the electromagnetic waves excited by the high-frequency radiating unit irradiate the radiating structure, and the radiator on the radiating structure and the multi-layer surface periodic structure together constitute a non-resonant node spatial bandpass filter circuit with K resonance points and K zero points, where K ≥ 1;

[0010] When the radiating structure operates in the second mode, low-frequency electromagnetic waves excite the radiating structure through the feeding structure, and the units of the multi-layer surface periodic structure are excited by the radiator in parallel to form an equivalent filtering circuit.

[0011] 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. The first radiating arm and the third radiating arm constitute the +45° polarization of the low-frequency radiating unit, and the second radiating arm and the fourth radiating arm constitute the -45° polarization of the low-frequency radiating unit.

[0012] Furthermore, each radiating arm includes a plurality of wave-transmitting / filtering units and a feeding block, each wave-transmitting / filtering unit includes two metal straight edges, a first U-shaped open circuit unit and a second U-shaped open circuit unit, and the feeding block is connected to the feeding structure;

[0013] Two metal straight edges are respectively arranged on the top and bottom layers of the substrate, and the two metal straight edges are connected by metal through-holes. The metal straight edges and feed blocks of several wave-transmitting / filtering units are sequentially connected to form a ring-shaped polygon.

[0014] The first U-shaped open circuit unit and the second U-shaped open circuit unit are located on one side or both sides of the metal straight edge, and dual-band or broadband wave transmission is achieved by controlling the resonant frequency of the first U-shaped open circuit unit and the second U-shaped open circuit unit.

[0015] Furthermore, when the first U-shaped open unit and the second U-shaped open unit are located on one side of the metal straight edge, the first U-shaped open unit is set on the top layer of the substrate and the second U-shaped open unit is set on the bottom layer of the substrate, or the first U-shaped open unit is set on the bottom layer of the substrate and the second U-shaped open unit is set on the top layer of the substrate.

[0016] Furthermore, when the first U-shaped open unit and the second U-shaped open unit are located on both sides of the metal straight edge, the first U-shaped open unit is set on the top layer of the substrate and the second U-shaped open unit is set on the bottom layer of the substrate, or the first U-shaped open unit is set on the bottom layer of the substrate and the second U-shaped open unit is set on the top layer of the substrate, or the first U-shaped open unit and the second U-shaped open unit are jointly set on the top layer of the substrate, or the first U-shaped open unit and the second U-shaped open unit are jointly set on the bottom layer of the substrate.

[0017] Furthermore, the width of the metal straight edge is 1.5 mm to 2 mm.

[0018] Furthermore, the total length of the first U-shaped open unit and the second U-shaped open unit is half of the operating wavelength of the corresponding wave transmission band, the line width is 1-2 mm, the U-shaped opening width is 2-5 mm, and the distances between the first U-shaped open unit and the second U-shaped open unit and the metal straight edge are 0.01-0.03 times the wavelength of the corresponding frequency band respectively.

[0019] Furthermore, one of the first U-shaped open-circuit unit and the second U-shaped open-circuit unit is expanded into a shape of an equivalent resonant circuit.

[0020] Furthermore, the shape of the equivalent resonant circuit is a straight line, and the U-shaped open-circuit unit expanded into a straight line is located on the inner side of the metal straight edge, or on the outer side of the metal straight edge.

[0021] Furthermore, the shape of the equivalent resonant circuit is a straight line, and the U-shaped open circuit unit expanded into a straight line is located on the same side of another U-shaped open circuit unit, or the U-shaped open circuit unit expanded into a straight line and another U-shaped open circuit unit are located on both sides of the metal straight edge.

[0022] Furthermore, when the U-shaped open unit expanded into a straight line and another U-shaped open unit are located on both sides of the straight edge of the metal, the U-shaped open unit expanded into a straight line is set on the top layer of the substrate, and the other U-shaped open unit is set on the bottom layer of the substrate, or the U-shaped open unit expanded into a straight line is set on the bottom layer of the substrate, and the other U-shaped open unit is set on the top layer of the substrate.

[0023] Furthermore, the feeding block is directly opposite to a wave transmission / filtering unit;

[0024] In the first and third radiating arms, the length of the connection line between the feeding block and the opposite wave-transmitting / filtering unit is 0.44 to 0.5 times the wavelength corresponding to the working center frequency of the low-frequency radiating unit;

[0025] In the second radiating arm and the fourth radiating arm, the length of the connection line between the feeding 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 low-frequency radiating unit.

[0026] The second object of the present invention can be achieved by adopting the following technical solutions:

[0027] A co-aperture antenna array includes a first antenna, a second antenna, and a reflector. The first antenna is the above-mentioned broadband wave-transmitting / filtering radiating unit, and the second antenna is a high-frequency radiating array. The broadband wave-transmitting / filtering radiating unit and the high-frequency radiating array are distributed on the reflector, and the broadband wave-transmitting / filtering radiating unit is placed in the high-frequency radiating array.

[0028] Furthermore, the common-aperture antenna array is expanded into a multi-layer structure, each layer is loaded with a resonant structure, forming a multi-frequency resonant circuit to achieve multi-frequency wave transmission / filtering characteristics.

[0029] The third object of the present invention can be achieved by adopting the following technical solutions:

[0030] A mobile communication device comprises the above-mentioned broadband wave-transmitting / filtering radiation unit, or comprises the above-mentioned satellite communication filtering common-aperture antenna array.

[0031] The present invention has the following beneficial effects compared to the prior art:

[0032] The broadband wave-transmitting / filtering radiation unit of the present invention has a simple structure and integrates a filtering function while maintaining good wave-transmitting performance, which has important research significance and broad application prospects. In addition, by designing a wave-transmitting / filtering unit on the radiator of the radiation unit, it can effectively improve the radiation pattern of the high-frequency radiation array while widening the standing wave bandwidth of the radiation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 these drawings without paying any creative work.

[0034] FIG1 is a schematic structural diagram of a broadband wave-transmitting / filtering radiation unit according to Embodiment 1 of the present invention.

[0035] FIG2 is a circuit diagram of an equivalent spatial bandpass filter of the radiation structure according to embodiment 1 of the present invention operating in the first mode.

[0036] FIG3 is a diagram of an equivalent filtering circuit of the radiation structure according to embodiment 1 of the present invention operating in the second mode.

[0037] FIG4 is a diagram of an equivalent non-resonant node filter circuit after the combination of FIG3 .

[0038] FIG5 is a schematic diagram of the radiation structure of Example 1 of the present invention.

[0039] FIG6 is a schematic structural diagram of a radiation arm according to Embodiment 1 of the present invention.

[0040] FIG7 is a schematic structural diagram of a wave transmission / filtering unit according to embodiment 1 of the present invention.

[0041] FIG8 is a diagram showing the wave transmission simulation results of the wave transmission / filtering unit according to Example 1 of the present invention.

[0042] FIG9 is a diagram showing the RCS simulation results of the radiating arm of Example 1 of the present invention.

[0043] FIG10 is a comparison diagram of gain curves of the broadband wave-transmitting / filtering radiating unit according to Example 1 of the present invention and a traditional low-frequency radiating unit.

[0044] FIG11 is a schematic diagram of the structure of a co-aperture antenna array according to Embodiment 2 of the present invention.

[0045] FIG12 is a schematic diagram of the radiation arm structure of Example 3 of the present invention.

[0046] FIG13 is a schematic diagram of the radiation arm structure of embodiment 4 of the present invention.

[0047] FIG14 is a schematic diagram of the radiation arm structure of Example 5 of the present invention.

[0048] Among them, 1-radiation structure, 11-radiator, 111-substrate, 112-first radiation arm, 113-second radiation arm, 1131-wave transmission / filtering unit, 11311-metal straight edge, 11312-first U-shaped open circuit unit, 11313-second U-shaped open circuit unit, 1132-feeding block, 114-third radiation arm, 115-fourth radiation arm, 12-surface periodic structure, 2-feeding structure, 3-high-frequency radiation unit, 4-reflector. DETAILED DESCRIPTION

[0049] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0051] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the terms used in this specification include any and all combinations of the relevant listed items.

[0052] Example 1:

[0053] As shown in Figure 1, this embodiment provides a broadband wave-transmitting / filtering radiation unit, which is a low-frequency radiation unit, including a radiation structure 1 and a feeding structure 2. The radiation structure 1 and the feeding structure 2 adopt a coupled feeding method so that the radiation structure 1 radiates low-frequency electromagnetic wave signals outward. The radiation structure includes a radiator 11, and the radiator 11 is loaded with a multi-layer surface periodic structure 12.

[0054] The radiation structure 1 of this embodiment can be divided into two working modes, namely the first mode and the second mode. When the radiation structure 1 works in the first mode, the electromagnetic waves excited by the high-frequency radiation unit 3 will irradiate the radiation structure 1, and the array arms on the radiation structure 1 and the multi-layer surface periodic structure together form a non-resonant node (Non-resonant Node, The invention relates to a spatial bandpass filter circuit (abbreviated as NRN) so that the electromagnetic wave energy excited by multiple high-frequency radiation units 3 passes through the low-frequency radiation unit as completely as possible, and improves the high-frequency array directivity pattern; when the radiation structure 1 works in the second mode, the low-frequency electromagnetic wave excites the radiation structure 1 through the feeding part. At this time, the multi-layer surface periodic structure 12 will be excited by the radiator 11 in parallel, forming the equivalent filter circuit shown in Figure 3. After circuit transformation and merging, the equivalent filter circuit of Figure 3 can be merged into the equivalent non-resonant node filter circuit shown in Figure 4; it has been proved that the non-resonant node structure in Figure 4 will produce K 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, the radiation zero point frequency can be controlled by modulating the unit resonant frequency of the periodic surface to improve the out-of-band suppression of the antenna, where K≥1.

[0055] As shown in Figures 1 and 5, in the radiation structure 1 of this embodiment, the radiator 11 includes four radiation arms, which are arranged on a substrate 111. The four radiation arms are respectively a first radiation arm 112, a second radiation arm 113, a third radiation arm 114, and a fourth radiation arm 115. The first radiation arm 112 and the third radiation arm 114 constitute the +45° polarization of the low-frequency radiation unit, and the second radiation arm 113 and the fourth radiation arm 115 constitute the -45° polarization of the low-frequency radiation unit. The circuit on the radiator 11 can be etched on the top and bottom layers of the substrate 111 using a PCB (Printed Circuit Board). The solid line portion represents the top layer circuit of the substrate 111, and the diagonal line portion represents the bottom layer circuit of the substrate 111. The order of the solid line portion and the diagonal line portion can also be reversed, that is, the solid line portion represents the bottom layer circuit of the substrate 111, and the diagonal line portion represents the top layer circuit of the substrate 111.

[0056] As shown in FIG6 , it is a structural diagram of the radiation arm of this embodiment. Taking the second radiation arm 113 as an example, the second radiation arm 113 includes seven wave-transmitting / filtering units 1131 and a feeding block 1132. As shown in FIG7 , each wave-transmitting / filtering unit 1131 includes two metal straight edges 11311, a first U-shaped open circuit unit 11312 and a second U-shaped open circuit unit 11313. The feeding block 1132 is connected to the feeding structure 2. The two metal straight edges 11311 are respectively arranged on the top and bottom layers of the substrate 111. The two metal straight edges 11311 are connected by metal through holes. The metal straight edges 11311 and the feeding blocks 1132 of the seven wave-transmitting / filtering units 1131 are connected in sequence. The connection forms a circular octagon, and the rotation angle between each two adjacent wave-transmitting / filtering units 1131 is 30°~45°; the first U-shaped open unit 11312 and the second U-shaped open unit 11313 are located on one side of the metal straight edge 11311, and the first U-shaped open unit 11312 is arranged on the top layer of the substrate 111, and the second U-shaped open unit 11313 is arranged on the bottom layer of the substrate 111. It can be understood that the positions of the first U-shaped open unit 11312 and the second U-shaped open unit 11313 are interchangeable, that is, the first U-shaped open unit 11312 is arranged on the bottom layer of the substrate 111, and the second U-shaped open unit 11313 is arranged on the top layer of the substrate 111.

[0057] Furthermore, the two metal straight edges 11311 are regarded as one metal component, the first U-shaped open circuit unit 11312 and the second U-shaped open circuit unit 11313 are two metal components respectively, and the three metal components can form two frequency bands of wave-transmitting channels in the high frequency band; wherein, the width of the metal straight edge 11311 is 1.5mm-2mm, and a line width that is too thin exhibits a higher inductance characteristic, which is not conducive to the impedance matching of the low-frequency radiation unit and affects the working bandwidth of the low-frequency radiation unit, while a line width that is too wide is easy to cause high-frequency electromagnetic The wave irradiates the wave-transmitting unit, causing an excessively strong surface wave that affects the wave-transmitting effect. The total length of the first U-shaped open unit 11312 and the second U-shaped open unit 11313 is half of the operating wavelength of the corresponding wave-transmitting frequency band, the line width is 1-2 mm, the U-shaped opening width is 2-5 mm, and the distances between the first U-shaped open unit 11312 and the second U-shaped open unit 11313 and the metal straight edge 11311 are 0.01-0.03 times the wavelength of the corresponding frequency band, respectively. By controlling the first U-shaped open unit 113 12 and the resonant frequency of the second U-shaped open-circuit unit 11313 to achieve dual-band or broadband wave transmission. For the low-frequency radiation unit, the self-current of the first U-shaped open-circuit unit 11312 and the second U-shaped open-circuit unit 11313 does 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; the feeding block 1132 is facing a wave-transmitting / filtering unit 1131, and the feeding block 1132 in the second radiation arm 113 is opposite to the wave-transmitting / filtering unit 1131. The connection length is 0.22~0.25 times the wavelength corresponding to the working center frequency of the low-frequency radiation unit; accordingly, the connection length between the feeding block in the fourth radiation arm 115 and the opposite wave-transmitting / filtering unit is also 0.22~0.25 times the wavelength corresponding to the working center frequency of the low-frequency radiation unit; and in the first radiation arm 112 and the third radiation arm 114, the connection length between the feeding block and the opposite wave-transmitting / filtering unit is 0.44~0.5 times the wavelength corresponding to the working center frequency of the low-frequency radiation unit.

[0058] As shown in Figure 8, the simulation performance indicators of the high-frequency electromagnetic wave incident on the wave-transmitting / filtering unit are shown. There are two resonance points at 3.48 GHz and 2.24 GHz, indicating that its two U-shaped open-circuit units resonate at 3.48 GHz and 2.24 GHz. S21 indicates the energy loss of the incident wave after passing through the wave-transmitting unit within the working frequency band. From the simulation results, it is between 0.11-0.29 dB. Since a single wave-transmitting / filtering unit is a typical resonant circuit with a narrow working bandwidth, multiple wave-transmitting / filtering units are connected to form a radiation arm for RCS simulation. As shown in Figure 9, the RCS is less than -15 dB in the entire 2 GHz to 4 GHz range, indicating that the radiation arm structure has good wave transmission characteristics.

[0059] As shown in Figure 10, this is a comparison diagram of the gain curves of the broadband wave-transmitting / filtering radiating unit of this embodiment and the traditional low-frequency radiating unit. It can be seen from the figure that in the 0.6-0.96GHz frequency band, the gain reaches 8dB, and the overlap between the two is very high, indicating that the addition of the wave-transmitting / filtering unit does not affect 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 frequency bands less than 0dB, effectively suppressing the radiation of the low-frequency radiating unit in the high-frequency band, showing filter characteristics.

[0060] Example 2:

[0061] As shown in Figure 11, this embodiment provides a co-aperture antenna array, which includes a first antenna, a second antenna and a reflector 4. The first antenna is the broadband wave-transmitting / filtering radiating unit of the above-mentioned embodiment 1, and the second antenna is a high-frequency radiating array. The broadband wave-transmitting / filtering radiating unit and the high-frequency radiating array are distributed on the reflector 4, and the broadband wave-transmitting / filtering radiating unit is placed in the high-frequency radiating array, and is fed from the front or back of the antenna through a cable or PCB. The high-frequency radiating array includes multiple high-frequency radiating units 3, and the high-frequency radiating units 3 used in the high-frequency radiating array are dual-polarized dipole units; the low-frequency radiating unit operates in the 617-960MHz frequency band, and the high-frequency radiating array operates in the 2400-3800MHz frequency band. When the high-frequency electromagnetic wave of the second antenna is incident on the radiator of the first antenna, the wave-transmitting / filtering unit on the radiator has a filtering effect on the high-frequency electromagnetic wave in the corresponding frequency band and acts as a spatial filter, so that the electromagnetic wave of the second antenna passes through the first antenna completely. It can be seen that the wave-transmitting / filtering unit on the radiator has a perspective effect on the high-frequency electromagnetic wave.

[0062] Example 3:

[0063] As shown in Figure 12, in the radiation arm of this embodiment, the first U-shaped open unit and the second U-shaped open unit are located on both sides of the metal straight edge, and the spacing between them is 0.01-0.03 times the wavelength of the corresponding frequency band, respectively. The first U-shaped open unit and the second U-shaped open unit of this embodiment are jointly arranged on the top layer of the substrate; according to the mirror principle, the first U-shaped open unit and the second U-shaped open unit can also be jointly arranged on the bottom layer of the substrate; it can be understood that the first U-shaped open unit can also be arranged on the top layer of the substrate and the second U-shaped open unit can be arranged on the bottom layer of the substrate, or the first U-shaped open unit can be arranged on the bottom layer of the substrate and the second U-shaped open unit can be arranged on the top layer of the substrate.

[0064] Example 4:

[0065] As shown in Figure 13, in the radiation arm of this embodiment, the first U-shaped open unit is unfolded into a straight line. The first U-shaped open unit unfolded into a straight line is called a linear open unit. The linear open unit and the second U-shaped open unit are located on the inner side of the metal straight edge, and the spacing between them is 0.01-0.03 times the wavelength of the corresponding frequency band. The linear open unit and the second U-shaped open unit of this embodiment are respectively arranged on the top layer of the substrate; according to the mirror principle, the linear open unit and the second U-shaped open unit can also be jointly arranged on the bottom layer of the substrate; it can be understood that the linear open unit and the second U-shaped open unit can also be placed on the outside of the metal straight edge.

[0066] Example 5:

[0067] As shown in Figure 14, in the radiation arm of this embodiment, the first U-shaped open unit is unfolded into a straight line. The first U-shaped open unit unfolded into a straight line is called a linear open unit. The linear open unit and the second U-shaped open unit are located on both sides of the metal straight edge, and the spacing between them is 0.01-0.03 times the wavelength of the corresponding frequency band. The linear open unit and the second U-shaped open unit of this embodiment are jointly arranged on the top layer of the substrate; according to the mirror principle, the linear open unit and the second U-shaped open unit can also be jointly arranged on the bottom layer of the substrate; it can be understood that the linear open unit can also be arranged on the top layer of the substrate and the second U-shaped open unit can be arranged on the bottom layer of the substrate, or the linear open unit can be arranged on the bottom layer of the substrate and the second U-shaped open unit can be arranged on the top layer of the substrate.

[0068] In the above-mentioned embodiments 4 and 5, the U-shaped open-circuit unit expanded into a straight line may also be the second U-shaped open-circuit unit. In addition to being expanded into a straight line, it may also be expanded into other equivalent resonant circuit shapes.

[0069] In summary, the broadband wave-transmitting / filtering radiation unit of the present invention has a simple structure and integrates filtering functions while maintaining good wave-transmitting performance. It has important research significance and broad application prospects. In addition, by designing a wave-transmitting / filtering unit on the radiator of the radiation unit, it can effectively improve the radiation pattern of the high-frequency radiation array while widening the standing wave bandwidth of the radiation unit.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A broadband wave-transmitting / filtering radiation unit, characterized in that: It includes a radiation structure and a feeding structure, wherein the radiation structure and the feeding structure adopt a coupled feeding method so that the radiation structure radiates low-frequency electromagnetic wave signals outwardly, and the radiation structure includes a radiator, and the radiator is loaded with a multi-layer surface periodic structure; When the radiation structure works in the first mode, the electromagnetic waves excited by the high-frequency radiation unit irradiate the radiation structure, and the radiator on the radiation structure and the multi-layer surface periodic structure together constitute a non-resonant node spatial bandpass filter circuit with K resonance points and K zero points, where K≥1; When the radiation structure works in the second mode, the low-frequency electromagnetic wave excites the radiation structure through the feeding structure, and the units of the multi-layer surface periodic structure are excited by the radiator in parallel to form an equivalent filtering circuit; The radiator comprises four radiating arms, which are arranged on a substrate, and the four radiating arms are respectively a first radiating arm, a second radiating arm, a third radiating arm and a fourth radiating arm, wherein the first radiating arm and the third radiating arm constitute a +45° polarization of a low-frequency radiating unit, and the second radiating arm and the fourth radiating arm constitute a -45° polarization of a low-frequency radiating unit; Each radiating arm includes a plurality of wave-transmitting / filtering units and a feeding block, each wave-transmitting / filtering unit includes two metal straight edges, a first open-circuit unit and a second open-circuit unit, and the feeding block is connected to the feeding structure; the two metal straight edges are respectively arranged on the top layer and the bottom layer of the substrate, and the two metal straight edges are connected by metal through holes, and the metal straight edges and the feeding blocks of the plurality of wave-transmitting / filtering units are sequentially connected to form an annular polygon; the first open-circuit unit and the second open-circuit unit are located on one side or both sides of the metal straight edge, and dual-band or broadband wave transmission is achieved by controlling the resonant frequency of the first open-circuit unit and the second open-circuit unit.

2. The broadband wave-transmitting / filtering radiation unit according to claim 1, characterized in that: The first opening unit and the second opening unit are both U-shaped opening units.

3. The broadband wave-transmitting / filtering radiation unit according to claim 2, characterized in that: When the first open circuit unit and the second open circuit unit are located on one side of the metal straight edge, the first open circuit unit is set on the top layer of the substrate and the second open circuit unit is set on the bottom layer of the substrate, or the first open circuit unit is set on the bottom layer of the substrate and the second open circuit unit is set on the top layer of the substrate.

4. The broadband wave-transmitting / filtering radiation unit according to claim 2, characterized in that: When the first open-circuit unit and the second open-circuit unit are located on both sides of the metal straight edge, the first open-circuit unit is set on the top layer of the substrate and the second open-circuit unit is set on the bottom layer of the substrate, or the first open-circuit unit is set on the bottom layer of the substrate and the second open-circuit unit is set on the top layer of the substrate, or the first open-circuit unit and the second open-circuit unit are jointly set on the top layer of the substrate, or the first open-circuit unit and the second open-circuit unit are jointly set on the bottom layer of the substrate.

5. The broadband wave-transmitting / filtering radiation unit according to any one of claims 2 to 4, characterized in that: The width of the metal straight edge is 1.5mm-2mm.

6. The broadband wave-transmitting / filtering radiation unit according to any one of claims 2 to 4, characterized in that: The total length of the first open-circuit unit and the second open-circuit unit is half of the working wavelength of the corresponding wave-transmitting frequency band, the line width is 1-2mm, the U-shaped opening width is 2-5mm, and the distances between the first open-circuit unit and the second open-circuit unit and the metal straight edge are 0.01-0.03 times the wavelength of the corresponding frequency band respectively.

7. The broadband wave-transmitting / filtering radiation unit according to claim 1, characterized in that: One of the first open-circuit unit and the second open-circuit unit is in the shape of an equivalent resonant circuit, and the other open-circuit unit is a U-shaped open-circuit unit.

8. The broadband wave-transmitting / filtering radiation unit according to claim 7, characterized in that: The shape of the equivalent resonant circuit is a straight line, and the straight open-circuit unit is located on the inner side of the metal straight edge, or on the outer side of the metal straight edge.

9. The broadband wave-transmitting / filtering radiation unit according to claim 7, characterized in that: The shape of the equivalent resonant circuit is a straight line, the straight line open circuit unit is located on the same side of the U-shaped open circuit unit, or the straight line open circuit unit and the U-shaped open circuit unit are located on both sides of the metal straight edge.

10. The broadband wave-transmitting / filtering radiation unit according to claim 9, characterized in that: When the linear open circuit unit and the U-shaped open circuit unit are located on both sides of the metal straight edge, the linear open circuit unit is set on the top layer of the substrate and the U-shaped open circuit unit is set on the bottom layer of the substrate, or the linear open circuit unit is set on the bottom layer of the substrate and the U-shaped open circuit unit is set on the top layer of the substrate.

11. The broadband wave-transmitting / filtering radiation unit according to any one of claims 1 to 4 and 7 to 10, characterized in that: The feeding block is directly opposite to a wave transmission / filtering unit; In the first radiation arm and the third radiation arm, the length of the connection line between the feeding block and the opposite wave transmission / filtering unit is 0.44 to 0.5 times the wavelength corresponding to the working center frequency of the low-frequency radiation unit; In the second radiation arm and the fourth radiation arm, the length of the connection line between the feeding block and the opposite wave transmission / filtering unit is 0.22-0.25 times the wavelength corresponding to the working center frequency of the low-frequency radiation unit.

12. A common aperture antenna array, characterized in that: It includes a first antenna, a second antenna and a reflector, the first antenna is the broadband wave-transmitting / filtering radiation unit according to any one of claims 1 to 11, the second antenna is a high-frequency radiation array, the broadband wave-transmitting / filtering radiation unit and the high-frequency radiation array are distributed on the reflector, and the broadband wave-transmitting / filtering radiation unit is placed in the high-frequency radiation array.

13. The common aperture antenna array according to claim 12, characterized in that: The common-aperture antenna array is expanded into a multi-layer structure, each layer is loaded with a resonant structure, forming a multi-frequency resonant circuit to achieve multi-frequency wave transmission / filtering characteristics.

14. A mobile communication device, characterized in that: It comprises the broadband wave-transmitting / filtering radiation unit as described in any one of claims 1-11, or comprises the common-aperture antenna array as described in any one of claims 12-13.

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