Radiating unit and multi-frequency antenna

Abstract

The invention relates to a radiation unit and a multi-frequency antenna. The mutual coupling amount of the two conductor sections during working is correspondingly reduced along with increasing of the distance a, and a is larger than or equal to 1 / 20 lambda < 2 >, namely the distance a is larger, so that the mutual coupling amount of the two conductor sections during working is smaller, namely, the two conductor sections are in a weak mutual coupling state, and when the current directions of the two conductor sections are opposite, the mutual coupling amount of the two conductor sections is smaller. Therefore, the scattering suppression structure formed by the two conductor sections with opposite current directions and the low-pass high-resistance section has a scattering self-counteracting function and has a relatively good scattering suppression effect. In addition, due to the fact that the distance a is large, the radiation arms can be manufactured through the circuit board technology and the metal plate technology, and machining is more convenient. In addition, a + 2b cannot be too large, when a + 2bgt; when a + 2b is less than or equal to 1 / 2 lambda 1, a resonance mode can be caused in a preset working frequency band, in other words, when a + 2b is less than or equal to 1 / 2 lambda 1, low scattering interference on the preset working frequency band can be ensured.

Description

Technical Field

[0001] The present application relates to the field of mobile communication technology, and in particular to a radiation unit and a multi-frequency antenna. Background Art

[0002] With the development of mobile communication systems, antennas, as components for receiving / transmitting signals in mobile communication systems, have developed rapidly. In order to achieve overall miniaturization of antennas and support multi-band applications, multi-band common aperture antennas are increasingly widely used. Multi-band common aperture antennas include at least two radiating units, low-band and high-band. There is even a need to form an array with radiating units in three frequency bands, low-band, mid-band and high-band. The low-band radiating units have larger apertures and are usually higher than the radiating units in other frequency bands. When they are formed together, the induced current on the surface of the low-band radiating units will produce scattering interference, resulting in reduced performance of the radiating units in other frequency bands.

[0003] In the related art, in order to suppress scattering interference, a scattering suppression structure is usually provided on the radiating arm of the low-frequency radiating unit. When the scattering suppression structure senses a high-frequency signal, it forms an inductance to block the high-frequency signal, thereby achieving scattering suppression. However, in order to achieve a better scattering suppression effect, the number of scattering suppression structures is large, resulting in a complicated structure of the radiating arm of the low-frequency radiating unit, which is not easy to process, and the increase in scattering suppression structures will have an adverse effect on the performance of the low-frequency radiating unit itself. Summary of the invention

[0004] Based on this, it is necessary to overcome the defects of the prior art and provide a radiation unit and a multi-frequency antenna, which can have a good scattering suppression effect, and at the same time are easy to process and have little impact on the performance of the low-frequency band radiation unit itself.

[0005] A radiation unit, the radiation unit includes a radiation arm, the radiation arm includes: a feeding part and a radiation ring, the radiation ring is connected to the feeding part, the radiation ring includes a scattering suppression structure, the scattering suppression structure is used to suppress signals in a preset working frequency band, the scattering suppression structure includes two conductor segments and a connecting segment connected between the conductor segments, the current directions of the two conductor segments are opposite, and the connecting segment is a low-pass high-impedance segment; the spacing between the two conductor segments is a, the length of the conductor segment is b, the highest frequency wavelength of the preset working frequency band is λ1, and the lowest frequency wavelength of the working frequency band of the radiation arm is λ2, wherein a+2b≤1 / 2λ1, a≥1 / 20λ2.

[0006] In one embodiment, there are multiple scattering suppression structures, and the multiple scattering suppression structures are connected in series.

[0007] In one embodiment, the radiation ring further includes a plurality of interconnection segments, and each of the interconnection segments is connected in series between any two adjacent scattering suppression structures.

[0008] In one embodiment, the length of the interconnection segment is C, 0 <C≤1 / 2λ1。

[0009] In one embodiment, the line width of the connecting segment is set to ≤1 / 50λ1, and / or the line width of the interconnecting segment is set to ≤1 / 50λ1, and / or the line width of the radiation ring at various locations along its annular direction is the same.

[0010] In one embodiment, the number of the scattering suppression structures is 2 to 6.

[0011] In one embodiment, the plurality of scattering suppression structures include a first scattering suppression structure and a second scattering suppression structure, and the first scattering suppression structure and the second scattering suppression structure are arranged at an angle.

[0012] In one embodiment, the radiation arm is arranged in an axisymmetric structure; one of the first scattering suppression structures and one of the second scattering suppression structures form a scattering suppression group, and at least one of the scattering suppression groups is arranged on any side of the symmetry axis Z of the radiation arm.

[0013] In one embodiment, each of the scattering suppression structures is formed with an opening; the opening of the scattering suppression structure close to the feeding part faces the outside of the radiation ring; and / or the opening of the scattering suppression structure away from the feeding part faces the inside of the radiation ring.

[0014] In one embodiment, the connecting segment includes one or more combinations of a straight line segment, an arc segment, an S-shaped line segment and a broken line segment.

[0015] In one embodiment, the number of the radiating arms is four and they are arranged in orthogonal polarizations.

[0016] In one of the embodiments, the radiating arm further includes a substrate, and the feeding portion and the radiating ring are circuit layers arranged on the substrate; or, the radiating arm is configured as a sheet metal part.

[0017] A multi-frequency antenna, comprising a first radiation unit, a second radiation unit and a reflection plate, wherein the first radiation unit and the second radiation unit are arranged on the reflection plate, the working frequency band of the first radiation unit is lower than the working frequency band of the second radiation unit, the first radiation unit adopts the radiation unit, the projection of the first radiation unit on the reflection plate is set to be a first projection, the projection of the second radiation unit on the reflection plate is set to be a second projection, and the first projection and the second projection at least partially overlap.

[0018] In one embodiment, the four radiation arms of each of the first radiation units correspond to the positions of four second radiation units respectively, and the projection of the radiation arm of the first radiation unit on the reflection plate at least partially overlaps with the projection of the corresponding second radiation unit on the reflection plate.

[0019] In the above-mentioned radiation unit and multi-frequency antenna, the mutual coupling amount of the two conductor segments during operation decreases accordingly with the increase of the spacing a. Since a≥1 / 20λ2, that is, the spacing a is large, the mutual coupling amount of the two conductor segments during operation is small, that is, the two conductor segments in the present application are in a weak mutual coupling state. When the current directions of the two conductor segments are opposite, the radiation fields generated by the external space radiation cancel each other out. Therefore, the scattering suppression structure formed by the two conductor segments with opposite current directions and the low-pass high-resistance segment in the present application has a scattering self-cancellation function and has a good scattering suppression effect. In addition, since the spacing a is large, not only the circuit board process can be used to make the radiation arm, but also the sheet metal process can be used to make the radiation arm, which can be more convenient for processing. In addition, a+2b cannot be too large. When a+2b>1 / 2λ1, a resonant mode will be caused in the preset working frequency band. In other words, when a+2b≤1 / 2λ1, it can be used to ensure that there is lower scattering interference in the preset working frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a structural diagram of a radiation arm according to an embodiment of the related art.

[0021] FIG. 2 is a structural diagram of a radiation arm according to a first embodiment of the present application.

[0022] FIG. 3 is a structural diagram of a radiation arm according to a second embodiment of the present application.

[0023] FIG. 4 is a structural diagram of a scattering suppression structure in a radiation arm according to an embodiment of the present application.

[0024] FIG. 5 is a structural diagram of a scattering suppression structure in a radiation arm according to another embodiment of the present application.

[0025] FIG. 6 is a structural diagram of a connecting section in a radiating arm according to an embodiment of the present application.

[0026] FIG. 7 is a structural diagram of a connecting section in a radiating arm according to another embodiment of the present application.

[0027] FIG8 is a structural diagram of a radiation unit according to an embodiment of the present application.

[0028] FIG. 9 is a structural diagram of a radiation unit according to another embodiment of the present application.

[0029] FIG. 10 is a structural diagram of a multi-frequency antenna according to an embodiment of the present application.

[0030] FIG11 is a comparison diagram of single-station radar cross section (RCS) response curves of the three different radiating arms shown in FIG1 , FIG2 and FIG3 under plane wave excitation adjustment.

[0031] 110, conductive segment; 120, inductive element; 121, transmission line;

[0032] 20. Radiating unit; 21. Radiating arm; 211. Feeding unit; 212. Radiating ring; 213. Scattering suppression structure; 2131. Conductor segment; 2132. Connecting segment; 2133. Opening; 2134. Scattering suppression group; 2135. First scattering suppression structure; 2136. Second scattering suppression structure; 214. Interconnecting segment; 215. Substrate; 201. First radiating unit; 202. Second radiating unit; 203. Reflecting plate. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] As described in the background technology, there are many scattering suppression structures in the prior art, which leads to the problem that the radiation arm structure of the low-frequency band radiation unit is complicated and inconvenient to process. The inventor has found that the reason for this problem is that, please refer to Figure 1, which shows a radiation arm structure diagram of an embodiment of the related technology. The radiation arm includes a plurality of conductive segments 110 and a plurality of inductive elements 120 connected in series to form a closed loop structure. Among them, the conductive segment 110 is used to support the flow of low-frequency current, and the inductive element 120 is configured to have a relatively low impedance at low-frequency band frequencies and a relatively high impedance at high-frequency band frequencies, that is, the inductive element 120 plays a role in scattering suppression. The inductive element 120 is, for example, set to a U-shaped structure as shown in Figure 1. The distance S between the two transmission lines 121 in the U-shaped structure is small, and when a high-frequency signal is sensed, an inductance is formed to resist the high frequency. However, when the distance S is small, the radiation arm will be inconvenient to process, especially it cannot be processed and manufactured by sheet metal processing. In addition, the line width W of the conductive segment 110 is designed to be relatively large, and resonance will occur when the signal of the second radiation unit is radiated to the conductive segment 110, thereby offsetting the scattering suppression effect at the inductive element 120, making the overall scattering suppression effect weaker.

[0035] Based on the above reasons, the present application provides a radiation unit and a multi-frequency antenna, which can have a good scattering suppression effect, and at the same time are easy to process and have little impact on the performance of the low-frequency band radiation unit itself.

[0036] Referring to FIG. 2, FIG. 4 and FIG. 5, FIG. 2 shows a structural diagram of a radiation arm 21 of a first embodiment of the present application, and FIG. 4 and FIG. 5 respectively show structural diagrams of two scattering suppression structures 213 of different shapes in a radiation arm 21 of an embodiment. A radiation unit 20 provided in an embodiment of the present application includes a radiation arm 21. The radiation arm 21 includes a feeding portion 211 and a radiation ring 212. The radiation ring 212 is connected to the feeding portion 211, and the radiation ring 212 includes a scattering suppression structure 213, and the scattering suppression structure 213 is used to suppress signals in a preset working frequency band. The scattering suppression structure 213 includes two conductor segments 2131 and a connecting segment 2132 connected between the conductor segments 2131. The current directions of the two conductor segments 2131 are opposite, and the connecting segment 2132 is a low-pass high-impedance segment. The distance between the two conductor segments 2131 is a, the length of the conductor segment 2131 is b, the highest frequency wavelength of the preset working frequency band is λ1, the lowest frequency wavelength of the working frequency band of the radiation arm 21 is λ2, wherein a+2b≤1 / 2λ1, a≥1 / 20λ2.

[0037] In some embodiments, the operating frequency band of the radiation arm 21 includes but is not limited to 698 MHz~960 MHz. Accordingly, a≥15 mm, and a is specifically 15 mm, 16 mm, 18 mm, 20 mm or 25 mm, etc., and can be flexibly adjusted and set according to actual needs.

[0038] In some embodiments, the preset working frequency band is higher than the working frequency band of the radiation arm 21. Optionally, the preset working frequency band includes but is not limited to 1427MHz~2690MHz or 3300MHz~4200MHz, etc., which can be flexibly adjusted and set according to actual needs and are not limited here. As a specific embodiment, the working frequency band of the radiation arm 21 is set to a low frequency band, and the preset working frequency band is correspondingly set to a high frequency band.

[0039] In the above-mentioned radiation unit 20, the mutual coupling amount of the two conductor segments 2131 during operation decreases accordingly with the increase of the spacing a. Since a≥1 / 20λ2, that is, the spacing a is large, the mutual coupling amount of the two conductor segments 2131 during operation is small, that is, the two conductor segments 2131 in the present application are in a weak mutual coupling state. When the current directions of the two conductor segments 2131 are opposite, the radiation fields of the external spatial radiation cancel each other out. Therefore, the scattering suppression structure formed by the two conductor segments 2131 with opposite current directions and the low-pass high-resistance segment in the present application has a scattering self-cancellation function and has a good scattering suppression effect. In addition, since the spacing a is large, not only the circuit board process can be used to make the radiation arm 21, but also the sheet metal process can be used to make the radiation arm 21, which can be more convenient for processing. In addition, a+2b cannot be too large. When a+2b>1 / 2λ1, a resonant mode will be caused in the preset working frequency band. In other words, when a+2b≤1 / 2λ1, it can be used to ensure that there is low scattering interference in the preset working frequency band.

[0040] It should be noted that the radiation ring 212 and the feeding part 211 can be connected to form a closed-loop structure or a non-closed-loop structure. In this embodiment, the radiation ring 212 and the feeding part 211 are combined to form a closed-loop structure as an example, that is, the radiation arm 21 is a closed-loop structure. Specifically, the radiation arm 21 is in a closed-loop shape and is hollow inside. When the radiation unit 20 including the radiation arm 21 is co-arrayed with the second radiation unit 202, on the one hand, the scattering suppression structure 213 of the radiation arm 21 can suppress the high-frequency bandwidth; on the other hand, the hollow radiation arm 21 can facilitate the transmission of the high-frequency signal emitted by the second radiation unit 202. Therefore, the radiation arm 21 is less involved in the mutual coupling and scattering of the second radiation unit 202, thereby improving the radiation performance of the high-frequency antenna when co-arrayed.

[0041] In some embodiments, the number of scattering suppression structures 213 is not limited to 1, but is set to multiple, for example, 2, 3, 4, 5, 6 or 8, etc., which can be set according to actual needs and are not limited here. When the number of scattering suppression structures 213 increases, the scattering suppression effect on the preset working frequency band can be increased. In this embodiment, there are multiple scattering suppression structures 213, and the multiple scattering suppression structures 213 are connected in series.

[0042] Optionally, the scattering suppression structures 213 are set to 4 or 6, and are sequentially and spaced apart on the radiation ring 212. In this way, the number of scattering suppression structures 213 is large, so that when the radiation arm 21 works, it has a good scattering suppression effect on the preset working frequency band; in addition, when the number of scattering suppression structures 213 is too large, for example, more than 6, it will cause an adverse effect on the working frequency band of the radiation arm 21. In this way, the number of scattering suppression structures 213 is set to be less than or equal to 6, so that the number of scattering suppression structures 213 is moderate, and the impact on the working frequency band of the radiation arm 21 itself is small. In addition, when the number of scattering suppression structures 213 is less than or equal to 6, due to the small number, the radiation arm 21 can be more convenient to process and manufacture.

[0043] In some embodiments, each scattering suppression structure 213 is formed with an opening 2133, specifically, two conductor segments 2131 and a connecting segment 2132 enclose the opening 2133. Optionally, as shown in FIG4 , the two conductor segments 2131 are, for example, perpendicular to the connecting segment 2132, so that the current directions of the two conductor segments 2131 are opposite, so that the radiation fields generated for external spatial radiation cancel each other out; or as shown in FIG5 , the structure formed by the combination of the two conductor segments 2131 and the connecting segment 2132 is, for example, in a U shape, that is, the connection parts of the two conductor segments 2131 and the connecting segment 2132 are allowed to be rounded, and the current directions of the two conductor segments 2131 are still opposite.

[0044] In some embodiments, the connection segment 2132 includes one or more combinations of a straight line segment, an arc segment, an S-shaped line segment, and a broken line segment.

[0045] In some embodiments, the plurality of scattering suppression structures 213 include a first scattering suppression structure 2135 and a second scattering suppression structure 2136. The extension direction of the conductor segment 2131 of the first scattering suppression structure 2135 and the extension direction of the conductor segment 2131 of the second scattering suppression structure 2136 are arranged at an angle. In other words, the opening 2133 directions of at least one pair of scattering suppression structures 213 are arranged at an angle. Among them, a first scattering suppression structure 2135 and a second scattering suppression structure 2136 form a scattering suppression group 2134. In this way, the two scattering suppression structures 213 of the scattering suppression group 2134 are arranged in two different directions, so that the two different directions have a suppressive effect on the preset working frequency band, so that the radiating units 20 of each preset working frequency band at different arrangement positions, different arrangement angles and different distances from the radiating arm 21 have a good scattering suppression effect. In addition, it has a good suppressive effect on the induced current from the dual-polarization irradiation field. Specifically, the two scattering suppression structures 213 of the scattering suppression group 2134 are arranged, for example, adjacently along the annular direction of the radiation ring 212 .

[0046] In some embodiments, the angle between the extension direction of the conductor segment 2131 of the first scattering suppression structure 2135 and the extension direction of the conductor segment 2131 of the second scattering suppression structure 2136 includes but is not limited to 60°, 70°, 80°, 90°, 100°, 110° or 120°, etc.

[0047] Specifically, the extension direction of the conductor segment 2131 of the first scattering suppression structure 2135 and the extension direction of the conductor segment 2131 of the second scattering suppression structure 2136 are perpendicular or substantially perpendicular to each other. Here, “substantially” perpendicular means that the extension direction of the conductor segment 2131 of the first scattering suppression structure 2135 and the extension direction of the conductor segment 2131 of the second scattering suppression structure 2136 are not strictly 90°, but are allowed to be perpendicular to each other, for example, with a deviation within the range of ±10°.

[0048] In some embodiments, referring to FIG. 2 , for example, there are two scattering suppression groups 2134 in the radiation ring 212. Optionally, the two scattering suppression groups 2134 are respectively arranged on opposite sides of the symmetry axis Z of the radiation arm 21, and are, for example, symmetrically arranged about the symmetry axis Z of the radiation arm 21. In this way, a better scattering suppression effect is achieved for signals in a preset working frequency band. The symmetry axis Z of the radiation arm 21 is also the polarization axis direction of the radiation arm 21.

[0049] In some embodiments, referring to FIG. 3, there are, for example, three scattering suppression groups 2134 in the radiation ring 212. Compared with the structure shown in FIG. 2, the structure shown in FIG. 3 can have one more scattering suppression group 2134. Two scattering suppression structures 213 in the additional scattering suppression group 2134 are respectively arranged on opposite sides of the symmetry axis Z of the radiation arm 21 and are symmetrically arranged with respect to the symmetry axis Z of the radiation arm 21, for example. In this way, by increasing the number of scattering suppression structures 213, the length of the interconnection segment 214 can be reduced, thereby preventing the length of the interconnection segment 214 from being too long to generate resonance and canceling the scattering suppression effect.

[0050] Referring to FIG. 2 or FIG. 3, in some embodiments, the opening 2133 of the scattering suppression structure 213 close to the feeding part 211 faces the outside of the radiation ring 212; and / or, the opening 2133 of the scattering suppression structure 213 far from the feeding part 211 faces the inside of the radiation ring 212. In this way, the occupied area of the radiation arm 21 in a certain space can be made larger, so that the gain index and the directivity index are better.

[0051] Referring to FIG. 2 or FIG. 3, in a specific embodiment, the radiation arm 21 is arranged in an axisymmetric structure, and at least one pair of scattering suppression structures 213 is provided on either side of the symmetry axis Z of the radiation arm 21. In addition, a first scattering suppression structure 2135 and a second scattering suppression structure 2136 form a scattering suppression group 2134.

[0052] Referring to FIG. 2 or FIG. 3, in some embodiments, the radiation ring 212 further includes a plurality of interconnection segments 214. Each interconnection segment 214 is correspondingly connected in series between any two adjacent scattering suppression structures 213. The interconnection segment 214 serves to electrically connect any two adjacent scattering suppression structures 213, so that all the scattering suppression structures 213 are connected in series to form, for example, a closed-loop structure.

[0053] In one embodiment, the lengths of the respective interconnection segments 214 are flexibly adjusted and set according to actual needs, and they can be the same or different, which is not limited herein. Wherein, the length of the interconnection segment 214 is C, and 0 < C ≤ 1 / 2λ1. In this way, when the length C of the interconnection segment 214 is greater than 1 / 2λ1, resonance will occur, and the amount of resonance will increase with the increase of the length C, thereby canceling the scattering suppression effect of the scattering suppression structure 213. That is, when C ≤ 1 / 2λ1, the resonance generated by the interconnection segment 214 can be minimized, thereby improving the scattering suppression effect.

[0054] In some embodiments, referring to FIG. 2 , the connection section 2132 is specifically set as a straight line, and the line width of the straight line is set to ≤1 / 50λ1, specifically 1 / 50λ1, 1 / 75λ1 or 1 / 100λ1, etc. In this way, since the line width is small, the shielding of the radiation unit 20 of the preset working frequency band below it is small, thereby improving the antenna performance; in addition, the inductance at the connection section 2132 increases as the line width decreases, which plays a role in suppressing the induced current of the preset working frequency band.

[0055] Of course, as some optional solutions, please refer to Figure 6 or Figure 7, the connecting section 2132 can also be set as an inductor, or as a combination of an inductor and a capacitor, as long as it can play a low-pass and high-resistance role.

[0056] In addition, similar to the line width setting method of the connecting segment 2132, optionally, the line width of the interconnecting segment 214 includes but is not limited to being set to ≤1 / 50λ1, specifically for example ≤1 / 75λ1, or even less than 1 / 100λ1, thereby reducing the resonance amount of the signal in the preset working frequency band, and at the same time reducing the shielding of the radiation unit 20 in the preset working frequency band below it, thereby improving the antenna performance.

[0057] In a specific embodiment, the line width of the radiation ring 212 at various locations along the annular direction thereof is the same. Specifically, the line width of the radiation ring 212 is set to ≤1 / 50λ1, for example ≤1 / 75λ1, or even less than 1 / 100λ1, so as to reduce the resonance amount of the signal of the preset working frequency band, and at the same time reduce the shielding of the radiation unit 20 of the preset working frequency band below it, so as to improve the antenna performance.

[0058] In some embodiments, the radiation arm 21 further includes a substrate 215, as shown in FIG9 . The feeding portion 211 and the radiation ring 212 are, for example, a circuit layer disposed on the substrate 215. In a specific configuration, the substrate 215 and the circuit layer can be manufactured by using a printed circuit, that is, the circuit layer is printed on the substrate 215 to form a printed circuit board, or the substrate 215 can be a substrate 215 made of plastic or ceramic material, and a circuit layer is formed on the substrate 215 by other circuit manufacturing methods.

[0059] Optionally, the radiation arm 21 may also be made without the substrate 215 and, for example, by using a sheet metal process, as shown in FIG. 8 .

[0060] Please refer to Figures 1, 2, 3 and 11. Figure 11 shows a comparison of the single-station radar cross-section (RCS) response curves of three different radiating arms 21 of the structures shown in Figures 1, 2 and 3 under plane wave excitation adjustment. It can be seen from Figure 11 that, compared with the first embodiment and the related art, when four scattering suppression structures 213 are added, and the directions of the openings 2133 of the two pairs of scattering suppression structures 213 are perpendicular to each other, the scattering suppression effect can be better for the signals of 1427MHz~2690MHz and 3300MHz~4200MHz; compared with the second embodiment and the related art, when six scattering suppression structures 213 are added, and the directions of the openings 2133 of the three pairs of scattering suppression structures 213 are perpendicular to each other, the scattering suppression effect can be better for the signals of 1427MHz~2690MHz and 3300MHz~4200MHz; compared with the first embodiment and the second embodiment, the second embodiment has a better scattering suppression effect for the signals of 1427MHz~2690MHz and 3300MHz~4200MHz.

[0061] In one embodiment, the number of radiating arms 21 is four and they are arranged in orthogonal polarizations.

[0062] In some embodiments, the radiation unit 20 further includes a balun, and the balun is electrically connected to the feeding portion 211 .

[0063] Please refer to FIG. 10 . In one embodiment, the present application further provides a multi-frequency antenna, which includes a first radiation unit 201, a second radiation unit 202, and a reflector 203. The first radiation unit 201 and the second radiation unit 202 are disposed on the reflector 203. The operating frequency band of the first radiation unit 201 is lower than the operating frequency band of the second radiation unit 202. The first radiation unit 201 adopts the radiation unit 20 of any of the above embodiments. The projection of the first radiation unit 201 on the reflector 203 is set as a first projection, and the projection of the second radiation unit 202 on the reflector 203 is set as a second projection. The first projection and the second projection at least partially overlap.

[0064] In the above-mentioned multi-frequency antenna, the mutual coupling amount of the two conductor segments 2131 during operation decreases accordingly with the increase of the spacing a. Since a≥1 / 20λ2, that is, the spacing a is large, the mutual coupling amount of the two conductor segments 2131 during operation is small, that is, the two conductor segments 2131 in the present application are in a weak mutual coupling state. When the current directions of the two conductor segments 2131 are opposite, the radiation fields generated by the external space radiation cancel each other out. Therefore, the scattering suppression structure formed by the two conductor segments 2131 with opposite current directions and the low-pass high-resistance segment in the present application has a scattering self-cancellation function and has a good scattering suppression effect. In addition, since the spacing a is large, not only the circuit board process can be used to make the radiation arm 21, but also the sheet metal process can be used to make the radiation arm 21, which can be more convenient for processing. In addition, a+2b cannot be too large. When a+2b>1 / 2λ1, a resonant mode will be caused in the preset working frequency band. In other words, when a+2b≤1 / 2λ1, it can be used to ensure that there is low scattering interference in the preset working frequency band.

[0065] Please refer to Fig. 10. In a specific embodiment, the four radiation arms 21 of each first radiation unit 201 correspond to the positions of the four second radiation units 202. The projection of the radiation arm 21 of the first radiation unit 201 on the reflector 203 at least partially overlaps with the projection of the second radiation unit 202 at the corresponding position on the reflector 203. In this way, a compact layout can be achieved, and the overall aperture size of the product is small.

[0066] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0067] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0069] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A radiation unit, characterized in that: The radiation unit includes a radiation arm, and the radiation arm includes: a feeding part and a radiation ring, the radiation ring is connected to the feeding part, the radiation ring includes a scattering suppression structure, the scattering suppression structure is used to suppress signals in a preset working frequency band, the scattering suppression structure includes two conductor segments and a connecting segment connected between the conductor segments, the current directions of the two conductor segments are opposite, and the connecting segment is a low-pass high-impedance segment; the spacing between the two conductor segments is a, the length of the conductor segment is b, the highest frequency wavelength of the preset working frequency band is λ1, and the lowest frequency wavelength of the working frequency band of the radiation arm is λ2, wherein a+2b≤1 / 2λ1, a≥1 / 20λ2.

2. The radiation unit according to claim 1, characterized in that: There are a plurality of the scattering suppression structures, and the plurality of the scattering suppression structures are connected in series.

3. The radiation unit according to claim 2, characterized in that: The radiation ring further includes a plurality of interconnection segments, each of which is connected in series between any two adjacent scattering suppression structures.

4. The radiation unit according to claim 3, characterized in that: The length of the interconnection segment is C,0 <C≤1 / 2λ1。 5. The radiation unit according to claim 3, characterized in that: The line width of the connecting section is set to ≤1 / 50λ1, and / or the line width of the interconnecting section is set to ≤1 / 50λ1, and / or the line width of the radiation ring at various locations along its annular direction is the same.

6. The radiation unit according to claim 2, characterized in that: The number of the scattering suppression structures is 2 to 6.

7. The radiation unit according to claim 2, characterized in that: The plurality of scattering suppression structures include a first scattering suppression structure and a second scattering suppression structure, and the first scattering suppression structure and the second scattering suppression structure are arranged at an angle.

8. The radiation unit according to claim 7, characterized in that: The radiation arm is arranged in an axisymmetric structure; one of the first scattering suppression structures and one of the second scattering suppression structures form a scattering suppression group, and at least one of the scattering suppression groups is arranged on any side of the symmetry axis Z of the radiation arm.

9. The radiation unit according to claim 2, characterized in that: Each of the scattering suppression structures is formed with an opening; the opening of the scattering suppression structure close to the feed part faces the outside of the radiation ring; and / or the opening of the scattering suppression structure far from the feed part faces the inside of the radiation ring.

10. The radiation unit according to claim 1, characterized in that: The connecting segment includes one or more combinations of a straight line segment, an arc segment, an S-shaped line segment and a broken line segment.

11. The radiation unit according to claim 1, characterized in that: The number of the radiation arms is four and they are arranged in orthogonal polarizations.

12. The radiation unit according to any one of claims 1 to 11, characterized in that: The radiating arm further includes a substrate, and the feeding portion and the radiating ring are circuit layers arranged on the substrate; or, the radiating arm is arranged as a sheet metal part.

13. A multi-frequency antenna, characterized in that: The multi-frequency antenna includes a first radiation unit, a second radiation unit and a reflection plate, the first radiation unit and the second radiation unit are arranged on the reflection plate, the working frequency band of the first radiation unit is lower than the working frequency band of the second radiation unit, the first radiation unit adopts the radiation unit according to any one of claims 1 to 12, the projection of the first radiation unit on the reflection plate is set to be a first projection, the projection of the second radiation unit on the reflection plate is set to be a second projection, and the first projection and the second projection at least partially overlap.

14. The multi-frequency antenna according to claim 13, characterized in that: The four radiation arms of each of the first radiation units correspond to the positions of four second radiation units respectively, and the projection of the radiation arm of the first radiation unit on the reflection plate at least partially overlaps with the projection of the corresponding second radiation unit on the reflection plate.

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