Dual-band coplanar waveguide slot antenna

Abstract

The present disclosure provides a dual-frequency coplanar waveguide slot antenna, which is applied to the field of antenna technology, and includes: a plurality of L-band antennas and a plurality of X-band antennas, wherein the waveguide of the L-band antenna has a protruding structure along the length direction, the height of the protruding structure is the same as the height of the waveguide of the X-band antenna, the X-band antenna is arranged on both sides of the protruding structure, the length direction of the X-band antenna is perpendicular to the length direction of the protruding structure, and the waveguide of the X-band antenna is flush with the protruding structure.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a dual-frequency coplanar waveguide slot antenna. Background Art

[0002] In order to meet the requirements of dual-frequency antenna reuse within a limited aperture in phased array radar systems, it is necessary to design antenna units that work in two frequency bands and integrate the two to reuse within the same aperture. Among the existing antenna forms, waveguide antennas have become a commonly used antenna form due to their high bandwidth, stable structure, excellent scanning performance, and easy integration.

[0003] In order to achieve the integration of dual-frequency antennas, it is necessary to minimize the size of the antenna unit. In order to optimize the performance of waveguide slot antennas, many related studies have been conducted to reduce the azimuth size while ensuring good matching characteristics and radiation patterns of the antenna. The existing methods generally use the method of adding ridges in the waveguide to change the transmission mode of electromagnetic waves in the waveguide, thereby achieving lower-frequency electromagnetic excitation and propagation in a narrower size. Due to dual-frequency multiplexing, it is necessary to consider the interference between the two frequency bands during operation. Summary of the invention

[0004] The main purpose of the present application is to provide a dual-frequency coplanar waveguide slot antenna, aiming to solve at least one of the above technical problems.

[0005] To achieve the above-mentioned object, a first aspect of an embodiment of the present application provides a dual-frequency coplanar waveguide slot antenna, characterized in that it includes:

[0006] Multiple L-band antennas and multiple X-band antennas;

[0007] The waveguide of the L-band antenna has a protruding structure along the length direction, the height of the protruding structure is the same as the height of the waveguide of the X-band antenna, the X-band antennas are arranged on both sides of the protruding structure, the length direction of the X-band antenna is perpendicular to the length direction of the protruding structure, and the waveguide of the X-band antenna is flush with the protruding structure.

[0008] In one embodiment of the present disclosure, the waveguides of the plurality of L-band antennas are parallel to each other or on the same straight line, and the waveguides of the plurality of X-band antennas are parallel to each other or on the same straight line.

[0009] In one embodiment of the present disclosure, the waveguide of the L-band antenna is a slot waveguide, and a single first radiation slot is opened on the protruding structure.

[0010] In one embodiment of the present disclosure, the waveguide of the X-band antenna is a slot waveguide, and a plurality of second radiation slots are provided on an outer surface of the waveguide of the X-band antenna parallel to the first radiation slot.

[0011] In one embodiment of the present disclosure, the length of the protruding structure is an integer multiple of the width of the X-band antenna.

[0012] In an embodiment of the present disclosure, the number of the second radiation slots is 4, and the 4 second radiation slots are opened along the length direction of the waveguide of the X-band antenna.

[0013] In one embodiment of the present disclosure, a coaxial cable is provided at the bottom of the waveguide of the L-band antenna;

[0014] The plurality of L-band antennas are excited and fed by coaxial cables.

[0015] In one embodiment of the present disclosure, a coaxial cable is provided at the bottom of the waveguide of the X-band antenna;

[0016] The plurality of X-band antennas are excited and fed by coaxial cables.

[0017] In one embodiment of the present disclosure, the number of the plurality of X-band antennas is 72, and the 72 X-band antennas are arranged in 18 rows and 4 columns.

[0018] In an embodiment of the present disclosure, the number of the plurality of L-band antennas is 6, and the 6 L-band antennas are arranged in 2 rows and 3 columns.

[0019] It can be seen from the above embodiments of the present application that the dual-frequency coplanar waveguide slot antenna provided by the present application includes multiple L-band antennas and multiple X-band antennas, the waveguide of the L-band antenna has a protruding structure along the length direction, the height of the protruding structure is the same as the height of the waveguide of the X-band antenna, the X-band antenna is arranged on both sides of the protruding structure, and the length direction of the X-band antenna is perpendicular to the length direction of the protruding structure, and the waveguide of the X-band antenna is flush with the protruding structure. Dual-frequency coplanar multiplexing can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1A A schematic diagram of the front structure of a dual-frequency coplanar waveguide slot antenna provided in one embodiment of the present application;

[0022] Figure 1B A schematic diagram of the reverse structure of a dual-frequency coplanar waveguide slot antenna provided in one embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of an L-band antenna provided in one embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of an X-band antenna provided in one embodiment of the present application;

[0025] Figure 4 A test block diagram of the impact of an L-band antenna on an X-band antenna provided in an embodiment of the present disclosure;

[0026] Figure 5A A waveform diagram of the frequency spectrum received by the x1 and x5 units when the L-band antenna provided in one embodiment of the present disclosure transmits;

[0027] Figure 5B A waveform diagram of the frequency spectrum received by the x1 and x5 units when the L-band antenna provided in one embodiment of the present disclosure transmits;

[0028] Figure 6 A test block diagram of the influence of an X-band antenna on an L-band antenna provided in an embodiment of the present disclosure;

[0029] Fig. 7A A waveform diagram of the frequency spectrum received by the L-band antenna when the x1 and x5 units provide an embodiment of the present disclosure transmit;

[0030] Figure 7B This is a waveform diagram of the frequency spectrum received by the L-band antenna when the x1 and x5 units provided in one embodiment of the present disclosure transmit. DETAILED DESCRIPTION

[0031] In order to make the purpose, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0032] See also Figure 1A and Figure 1B , Figure 1A This is a front structural diagram of a dual-frequency coplanar waveguide slot antenna provided in an embodiment of the present application. Figure 1BA schematic diagram of the reverse structure of a dual-frequency coplanar waveguide slot antenna provided in one embodiment of the present application, wherein the dual-frequency coplanar waveguide slot antenna includes a plurality of L-band antennas 10 and a plurality of X-band antennas 20, wherein the waveguide 11 of the L-band antenna has a protruding structure 12 along the length direction, wherein the height of the protruding structure is the same as the height of the waveguide of the X-band antenna, the X-band antennas are arranged on both sides of the protruding structure, and the length direction of the X-band antenna is perpendicular to the length direction of the protruding structure, and the waveguide of the X-band antenna is flush with the protruding structure.

[0033] The present disclosure does not impose any specific limitation on the number of L-band antennas and X-band antennas. FIG. 1 is only a schematic example of the present disclosure. Those skilled in the art may make other equivalent changes according to the present disclosure.

[0034] In one embodiment of the present disclosure, the waveguides of the plurality of L-band antennas are parallel to each other or on the same straight line, and the waveguides of the plurality of X-band antennas are parallel to each other or on the same straight line.

[0035] In this disclosure, Figure 2 As shown, the L-band antenna is implemented by longitudinally slit the waveguide, the waveguide of the L-band antenna is a slot waveguide, and a single first radiation slot 13 is opened on the protruding structure.

[0036] In one embodiment of the present disclosure, Figure 3 As shown, the waveguide of the X-band antenna is a slot waveguide, and the waveguide of the X-band antenna is parallel to the outer surface of the first radiation slot and has a plurality of second radiation slots. The plurality of second radiation slots are distributed in a stepped manner along the length direction, which can optimize impedance matching.

[0037] The present disclosure does not impose any specific restrictions on the number of the second radiation slots. Figure 3 This is just an illustrative example of the present disclosure.

[0038] In one embodiment of the present disclosure, the length of the protruding structure is an integer multiple of the width of the X-band antenna. In one example, for example, the length of the protruding structure is 6 mm, and the width of the X-band antenna can be 1 mm, 2 mm, or 3 mm, etc. As shown in FIG. 1 , the length of the protruding structure is 9 times the width of the X-band antenna.

[0039] In an embodiment of the present disclosure, the number of the second radiation slots is 4, and the 4 second radiation slots are opened along the length direction of the waveguide of the X-band antenna.

[0040] In one embodiment of the present disclosure, a coaxial cable 100 is disposed at the bottom of the waveguide of the L-band antenna, and multiple L-band antennas are excited and fed by the coaxial cable. A coaxial cable 100 is disposed at the bottom of the waveguide of the X-band antenna, and multiple X-band antennas are excited and fed by the coaxial cable.

[0041] In one embodiment of the present disclosure, as shown in FIG1 , the number of the plurality of X-band antennas is 72, and the 72 X-band antennas are arranged in 18 rows and 4 columns. The number of the plurality of L-band antennas is 6, and the 6 L-band antennas are arranged in 2 rows and 3 columns.

[0042] In the present disclosure, as shown in Figure 1, the dual-band coplanar waveguide slot antenna array can be composed of 18*4, a total of 72 X-band antennas and 2*3, a total of 6 L-band antennas. The waveguides of the two antennas are perpendicular to each other and arranged in a staggered manner. The waveguide of the L-band antenna is buried under the waveguide of the X-band antenna. The first radiation slot of the L-band antenna passes through the X-band antenna through a protruding structure to reach the array plane, and is flush with the X-band antenna aperture, thereby realizing dual-band coplanar aperture multiplexing.

[0043] Figure 4 A test block diagram of the impact of an L-band antenna on an X-band antenna provided in an embodiment of the present disclosure, Figure 5A This is a waveform diagram of the frequency spectrum received by the x1 and x5 units when the L-band antenna provided in one embodiment of the present disclosure transmits. Figure 5B This is a waveform diagram of the frequency spectrum received by the x1 and x5 units when the L-band antenna provided in one embodiment of the present disclosure transmits. Figure 6 A test block diagram of the influence of an X-band antenna on an L-band antenna provided in an embodiment of the present disclosure, Fig. 7A This is a waveform diagram of the frequency spectrum received by the L-band antenna when the x1 and x5 units provided in one embodiment of the present disclosure transmit. Figure 7B This is a waveform diagram of the frequency spectrum received by the L-band antenna when the x1 and x5 units provided in one embodiment of the present disclosure transmit.

[0044] First, the effect of the L antenna transmission on the X antenna. The test block diagram is as follows Figure 4 ,from Figure 5A and Figure 5B The test results show that the X-band antenna at the X5 position received -34dBmW energy at the L-band center frequency (1.3GHz); the X-band antenna at the X1 position received -16dBmW energy at the L-band center frequency. When the L-band antenna radiates, although the X-band antenna has a certain out-of-band suppression effect, a part of the L-band energy will still be coupled to the X-band antenna. The coupling degree will vary with the position of the X-band antenna. The X-band receiving link design needs to be considered to determine its impact.

[0045] Secondly, the influence of X antenna transmission on the antenna. The test block diagram is as follows Figure 6 ,from Fig. 7A and Figure 7B The test results show that when the X5 antenna is excited, the L-band antenna receives -5.63dBmW energy at the X-band center frequency (9.6GHz); when the X1 antenna is excited, the L-band antenna receives -19.3dBmW energy at the X-band center frequency (9.6GHz). When the X-band antenna radiates, a portion of the X-band energy will be coupled to the L-band antenna. Considering that there are 18 X-band antennas around each L-band antenna, the coupling degree of each position to the L-band antenna is different, and the L-band receiving link design needs to be considered to determine its impact.

[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The above is a description of a dual-frequency coplanar waveguide slot antenna provided by the present invention. For technicians in this field, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dual-frequency coplanar waveguide slot antenna, characterized in that: include: Multiple L-band antennas and multiple X-band antennas; The waveguide of the L-band antenna has a convex structure along the length direction, the height of the convex structure is the same as the height of the waveguide of the X-band antenna, the X-band antennas are arranged on both sides of the convex structure, and the length direction of the X-band antenna is perpendicular to the length direction of the convex structure, and the waveguide of the X-band antenna is flush with the convex structure; Wherein, the waveguide of the L-band antenna is a slot waveguide, and a single first radiation slot is provided on the protruding structure; The waveguide of the X-band antenna is a slot waveguide, and a plurality of second radiation slots are provided on the outer surface of the waveguide of the X-band antenna parallel to the first radiation slot, and the plurality of second radiation slots are distributed in a stepped manner along the length direction; The length of the protruding structure is an integral multiple of the width of the X-band antenna.

2. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: The waveguides of the plurality of L-band antennas are parallel to each other or on the same straight line, and the waveguides of the plurality of X-band antennas are parallel to each other or on the same straight line.

3. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: The number of the second radiation slots is 4, and the 4 second radiation slots are opened along the length direction of the waveguide of the X-band antenna.

4. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: A coaxial cable is provided at the bottom of the waveguide of the L-band antenna; The plurality of L-band antennas are excited and fed by coaxial cables.

5. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: A coaxial cable is provided at the bottom of the waveguide of the X-band antenna; The plurality of X-band antennas are excited and fed by coaxial cables.

6. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: The number of the plurality of X-band antennas is 72, and the 72 X-band antennas are arranged in 18 rows and 4 columns.

7. The dual-frequency coplanar waveguide slot antenna according to claim 1, characterized in that: The number of the plurality of L-band antennas is 6, and the 6 L-band antennas are arranged in a manner of 2 rows and 3 columns.

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