Cavity-backed resonant coplanar waveguide antenna working in K wave band

Abstract

The utility model discloses a cavity-backed resonant coplanar waveguide antenna working in a K wave band, and belongs to the technical field of cavity-backed resonant coplanar waveguide antennas. The utility model relates to a cavity-backed coplanar waveguide antenna working in a K wave band. The antenna structure is divided into three layers and is mainly formed by tightly connecting an upper concentric annular radiation patch, a feed band line, a grounding plate, a middle dielectric plate and a lower resonant cavity, and the main transmission mode of the antenna is coplanar waveguide. The metal patch is made of copper, Roger RO3010 with the dielectric constant of 10.2 is selected as the dielectric plate, an Al2O3 ceramic resonant cavity is carried, good resonance characteristics are achieved, and the gain characteristics of the antenna are improved. According to the utility model, the process and the result of structure optimization are mainly displayed, and the HFSS and the CST are adopted as simulation tools to realize structure optimization and impedance matching. According to the design, the problems of high loss and low gain when the antenna works at high frequency are solved, and more possibilities are provided for the antenna in the fields of wireless communication, modern radar, base station antennas, unmanned driving and the like due to the good matching characteristic of the antenna.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of back cavity resonant type co-planar waveguide antenna, specifically relates to a back cavity resonant type co-planar waveguide antenna operating at K wave band. BACKGROUND

[0002] K wave band CPW (co-planar waveguide) back cavity type antenna is a kind of antenna type with important application prospect in modern communication technology.This kind of antenna due to its unique design and performance characteristics, in multiple fields, shows extensive application potential.Coplanar waveguide antenna is favored because of its high frequency band, low loss, easy to manufacture and integrate into various devices.

[0003] The research of K wave band CPW resonant antenna not only has important significance to improve the performance of antenna, but also shows broad application prospect in multiple fields.For example, in the field of satellite communication, this kind of antenna can be used to build high-throughput satellite communication system, improve data transmission rate and communication quality.In radar system, K wave band antenna can be used for target identification and tracking due to its good resolution and detection capability.In addition, with the development of wireless communication technology, K wave band antenna will also play an important role in future wireless local area network and mobile communication system.

[0004] Under the background of the increasing demand of K frequency band, how to design a scheme that can not only work stably in the characteristics of frequency band, but also maintain the compact shape, high efficiency and low cost of patch antenna, has become a challenge in the field of antenna design.In addition, with the development of 5G and future communication radar technology, the demand for co-planar waveguide antenna that can work in higher frequency range is growing continuously.Therefore, how to develop and design a back cavity resonant antenna operating at K wave band to meet the requirements of modern communication system for high-performance antenna has become imminent. UTILITY MODEL CONTENTS

[0005] In view of the problems of low gain and high loss of high-frequency antenna, the utility model is designed according to the characteristics that ceramic back cavity design can usually provide higher gain and co-planar waveguide technology can exhibit higher antenna efficiency, and on this basis, a co-planar waveguide antenna operating at K wave band is designed and provided.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A back cavity resonant type co-planar waveguide antenna operating at K wave band, the antenna comprises a top layer radiation metal plate, a top layer ground plate, an intermediate layer dielectric substrate and a bottom layer ceramic resonant cavity;

[0008] The top layer radiation metal plate is composed of concentric ring-shaped patch, circular string structure, rectangular tab and feed band line;

[0009] The concentric ring-shaped patch is composed of three circular rings a, b and c with different diameters and three rectangular bridges a, b and c with the same width; the three circular rings and the three rectangular bridges are arranged with the same center point O, the three circular rings are arranged with the center point O as the center, the three rectangular bridges are arranged radially with the center point O, and the angles between the rectangular bridge a and the rectangular bridge b and between the rectangular bridge b and the rectangular bridge c are both 90°; the circular string structure is arranged on the extension line of the symmetry axis of the rectangular bridge b; the rectangular tab is arranged on the reverse extension line of the symmetry axis of the rectangular bridge b; the feed line is arranged at the tail end of the long side of the rectangular tab, and the feed line is arranged in parallel with the rectangular bridge c;

[0010] The circular string structure is composed of five circular patches a, b, c, d and e with different diameters which are overlapped and nested; the center of the circular patch a is arranged on the outer diameter of the circular ring a, the center of the circular patch b is arranged on the outer diameter of the circular patch c, the center of the circular patch c is arranged on the outer diameter of the circular patch d, the center of the circular patch d is arranged on the outer diameter of the circular patch e, and the centers of the five circular patches are all on the extension line of the symmetry axis of the rectangular bridge b, thereby forming the circular string structure;

[0011] The top ground plate is composed of a ground plate a and a ground plate b; the ground plate a is in L shape, and the ground plate b is rectangular; and the ground plate a and the ground plate b surround the top radiation metal plate, and the inside of the side of the ground plate a close to the feed line is cut to form a triangular chamfer;

[0012] The signal is fed into the concentric ring-shaped patch through the feed line, and the antenna is formed in the mode of coplanar waveguide together with the intermediate layer dielectric substrate and the top ground metal plate. The coverage areas of the top radiation metal plate and the top ground metal plate are both smaller than the area of the intermediate layer dielectric substrate;

[0013] Further, the frequency band range of the antenna is 17.62GHz-19.65GHz and has three resonance points, and the application requirement that the standing wave ratio is less than 2 is met in the frequency band.

[0014] Further, the top radiation metal plate is integrally processed from a copper metal plate.

[0015] Further, the size of the triangular chamfer is that the length of the right angle side close to the feed line is 2mm, and the length of the other right angle side is 3mm.

[0016] Further, the inner diameter of the circular ring a is 1.3mm, and the outer diameter is 2.6mm;

[0017] The inner diameter of the circular ring b is 4mm, and the outer diameter is 5.4mm;

[0018] The inner diameter of the circular ring c is 7mm, and the outer diameter is 9mm;

[0019] The size of the feed line is 9.2mm*1.2mm;

[0020] The width of the rectangular bridge a, the rectangular bridge b and the rectangular bridge c is 0.5mm;

[0021] The width of the rectangular bridge a, the rectangular bridge b and the rectangular bridge c is 0.5mm;

[0022] The width of the rectangular bridge a, the rectangular bridge b and the rectangular bridge c is 0.5mm;

[0023] Further, the diameter of the circular patch a, the circular patch b, the circular patch c, the circular patch d and the circular patch e is 1.4mm, 1.2mm, 1.0mm, 0.8mm and 0.6mm.

[0024] Further, the top layer ground metal plate is made of copper material;

[0025] The length of the ground plate a is equal to the length of the middle layer dielectric substrate

[0026] Further, the middle layer dielectric substrate is made of Rogers RO3010 material, the relative dielectric constant of which is 10.2 and the loss tangent is 0.0035.

[0027] Further, the overall size of the middle layer dielectric substrate is 19mm*20mm*1.6mm.

[0028] Further, the bottom layer ceramic resonant cavity is made of Al2O3 material, and the overall size of the bottom layer ceramic resonant cavity is 19mm*20mm*2.3mm.

[0029] Further, the length and width of the bottom layer ceramic resonant cavity 4 are the same as the length and width of the middle layer dielectric substrate 3.

[0030] Compared with the prior art, the utility model has the following advantages:

[0031] 1. The top layer radiation metal plate of the antenna structure mainly comprises a "concentric ring" patch and a feed line, wherein the "concentric ring" patch adopts a circular ring, a circle and a rectangle as main design shapes, which is helpful to adjust the working frequency band and reduce the loss of the patch antenna. In the design of the "concentric ring" patch, the HFSS software is used to analyze the current intensity variation of the top layer metal radiation layer, a circular groove is opened on the basis of the large circular sheet in the area with high current density at the top end of the feed line, and a rectangular bridge is connected in the 0° and ±90° directions respectively, so that the current circulation is enhanced, the return loss of the antenna is reduced, and the ceramic resonant cavity is added, so that the radiation performance is enhanced. Therefore, the back wall type coplanar waveguide antenna designed in the utility model is designed by the shape of the top layer radiation metal plate, so that the antenna works in a specific K wave band range, and has good parameter indexes.

[0032] 2. The utility model fully develops the advantages of high frequency band, low loss and easy integration of the coplanar waveguide antenna, breaks through the shortcomings of low frequency band and low gain performance of the existing antenna, and the frequency band range of the antenna is 17.62GHz-19.65GHz and has three resonance points, and the application requirement that the standing wave ratio is less than 2 is met in the frequency band.

[0033] 3. The utility model places the designed coplanar waveguide antenna in the air cavity meeting the theoretical requirements, uses the full-wave simulation software HFSS based on the finite element algorithm to simulate and optimize and improve the performance parameters of the antenna, and determines the final size of the antenna. The results show that the S11 parameter of the antenna realizes the coverage of the frequency band from 17.62GHz to 19.65GHz. In this frequency band range, the antenna gain is all above 12dBi, which meets the frequency band requirement of the partial K wave band. Therefore, the designed antenna structure can be applied in the wireless communication system in these frequency bands. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0035] Figure 1 It is a structural schematic view of the coplanar waveguide antenna in the utility model.

[0036] Figure 2 It is a top view of the coplanar waveguide antenna in the utility model.

[0037] Figure 3 It is a front view of the coplanar waveguide antenna in the utility model.

[0038] Figure 4 A geometric relation diagram of the circular ring, circle, rectangle and feed line in the concentric ring-shaped patch structure design of the utility model;

[0039] Figure 5 A return loss relation curve diagram corresponding to the slot processing of the circular ring in the concentric ring-shaped patch structure design of the utility model;

[0040] Figure 6 A return loss diagram of the slot structure design of the co-planar waveguide antenna radiating unit in the utility model;

[0041] Figure 7 A return loss diagram of the co-planar waveguide antenna parameter optimization in the utility model;

[0042] Figure 8 A simulation VSWR (voltage standing wave ratio) curve diagram of the co-planar waveguide antenna in the utility model;

[0043] Figure 9 A simulation gain curve diagram of the co-planar waveguide antenna in the frequency band in the utility model;

[0044] Figure 10 E, H plane radiation diagrams of the 18.16GHz resonance point of the co-planar waveguide antenna in the utility model;

[0045] Figure 11 E, H plane radiation diagrams of the 18.52GHz resonance point of the co-planar waveguide antenna in the utility model;

[0046] Figure 12 E, H plane radiation diagrams of the 19.18GHz resonance point of the co-planar waveguide antenna in the utility model.

[0047] The drawing mark: 1, top layer radiation metal plate;1001, concentric ring-shaped patch;1002, circular string structure;1003, rectangular tab;1004, feed line;1005, circular ring a;1006, circular ring b;1007, circular ring c;1008, rectangular bridge a;1009, rectangular bridge b;1010, rectangular bridge c;1011, circular patch a;1012, circular patch b;1013, circular patch c;1014, circular patch d;1015, circular patch e;2, top layer ground plate;201, ground plate a;202, ground plate b;3, middle layer dielectric substrate;4, bottom layer ceramic resonant cavity. DETAILED DESCRIPTION

[0048] In order to understand the utility model, we will describe it in detail. However, the utility model has multiple implementation ways, and is not limited to the specific examples listed in this paper. The presentation of these examples aims to deepen the comprehensive understanding of the disclosure content of the utility model.

[0049] Embodiment 1

[0050] A back cavity resonant type co-planar waveguide antenna working in K band, the antenna comprising a top layer radiation metal plate 1, a top layer ground plate 2, an intermediate layer dielectric substrate 3, a bottom layer ceramic resonant cavity 4;

[0051] The top layer radiation metal plate 1 is composed of a concentric ring patch 1001, a circular string structure 1002, a rectangular patch 1003 and a feed line 1004;

[0052] The concentric ring patch 1001 is composed of three circular rings a1005, b1006 and c1007 with different diameters, and three rectangular bridges a1008, b1009 and c1010 with the same width; the three circular rings and the three rectangular bridges are arranged with the same center point O, the three circular rings are arranged with the center point O as the center, the three rectangular bridges are arranged radially with the center point O, and the angles between the rectangular bridge a1008 and the rectangular bridge b1009 and between the rectangular bridge b1009 and the rectangular bridge c1010 are both 90°; the circular string structure 1002 is arranged on the extension line of the symmetry axis of the rectangular bridge b1009; the rectangular patch 1003 is arranged on the reverse extension line of the symmetry axis of the rectangular bridge b1009; the feed line 1004 is arranged at the tail end of the long side of the rectangular patch 1003, and the feed line 1004 is arranged in parallel with the rectangular bridge c1010;

[0053] The circular string structure 1002 is composed of five circular patches a1011, b1012, c1013, d1014 and e1015 with different diameters which are overlapped and nested; the center of the circular patch a1011 is arranged on the outer diameter of the circular ring a1005, the center of the circular patch b1012 is arranged on the outer diameter of the circular patch c1013, the center of the circular patch c1013 is arranged on the outer diameter of the circular patch d1014, the center of the circular patch d1014 is arranged on the outer diameter of the circular patch e1015, and the centers of the five circular patches are all on the extension line of the symmetry axis of the rectangular bridge b1009, thereby forming the circular string structure 1002;

[0054] The top layer ground plate 2 is composed of a ground plate a201 and a ground plate b202; the ground plate a201 is in L shape, and the ground plate b202 is rectangular; and the ground plate a201 and the ground plate b202 surround the top layer radiation metal plate 1, and a triangular chamfer is cut on the inside of the side of the ground plate a201 close to the feed line 1004;

[0055] The signal is fed into the concentric ring patch 1001 through the feed line 1004, and the top layer radiation metal plate 1 and the top layer ground metal plate 2 together with the intermediate layer dielectric substrate 3 form an antenna in the manner of co-planar waveguide. The coverage areas of the top layer radiation metal plate 1 and the top layer ground metal plate 2 are both smaller than the area of the intermediate layer dielectric substrate 3.

[0056] Further, the frequency band range of the antenna is 17.62GHz-19.65GHz and has three resonance points, and the application requirement of the standing wave ratio less than 2 is met in the frequency band.

[0057] Further, the top layer radiation metal plate 1 is integrally processed by a copper metal plate.

[0058] Further, the size of the triangular chamfer is that the length of the straight angle side close to the feed line 1004 is 2mm; and the length of the other straight angle side is 3mm.

[0059] Further, the inner diameter of the circular ring a1005 is 1.3mm, and the outer diameter is 2.6mm;

[0060] The inner diameter of the circular ring b1006 is 4mm, and the outer diameter is 5.4mm;

[0061] The inner diameter of the circular ring c1007 is 7mm, and the outer diameter is 9mm;

[0062] The size of the feed line 1004 is 9.2mm*1.2mm;

[0063] The width of the rectangular bridge a1008, the rectangular bridge b1009 and the rectangular bridge c1010 is 0.5mm;

[0064] The width of the rectangular patch 1003 is 1.2mm.

[0065] Further, the diameters of the circular patch a1011, the circular patch b1012, the circular patch c1013, the circular patch d1014 and the circular patch e1015 are 1.4mm, 1.2mm, 1.0mm, 0.8mm and 0.6mm.

[0066] Further, the top layer ground metal plate 2 is made of metal copper material;

[0067] The length of the ground plate a201 is equal to the length of the middle layer dielectric substrate 3

[0068] The length of the ground plate b202 is 12.8mm, and the width is 3.5mm.

[0069] Further, the middle layer dielectric substrate 3 is made of Rogers RO3010 material, the relative dielectric constant is 10.2, and the loss tangent is 0.0035.

[0070] Further, the overall size of the middle layer dielectric substrate 3 is 19mm*20mm*1.6mm.

[0071] Furthermore, the bottom ceramic resonant cavity 4 is made of Al2O3 material, and its overall dimensions are 19mm×20mm×2.3mm.

[0072] Furthermore, the groove of the bottom ceramic resonant cavity 4 is obtained by reducing the ceramic periphery by 1mm and digging down from the top by 1mm.

[0073] Furthermore, the length and width of the bottom ceramic resonant cavity 4 are the same as the length and width of the intermediate dielectric substrate 3.

[0074] Example 2

[0075] As attached Figure 5 and 6 As shown, in the above concentric ring patch design, the antenna structure is optimized through electromagnetic simulation. The concentric ring patch 1001 is slotted, and its impact on the return loss value is observed. Figure 5 The image shows the observed change in return loss when a circular slot is cut in the center. Observations reveal that, within the frequency band, by cutting the slot, as... Figure 5 As shown in Figure a, the return loss value shows a decreasing trend and exhibits two resonant points. To further optimize the model, more circular slots are added. To ensure current flow, the annular structures within the slots must be integrally machined and connected. Therefore, three rectangular bridges are added, as shown... Figure 5 As shown in Figure b, the return loss shows a decreasing trend at this point, and there are still two resonant points. Further grooving is then performed on this basis, as shown... Figure 5 As shown in Figure c, the return loss decreased significantly and the number of resonant points increased to three, meeting the design requirements. Therefore, the antenna structure was determined to be a nested three-ring structure. (See attached figure.) Figure 6 As shown, the data was optimized using the controlled variable method to determine the structural radius. Keeping the radii of rings a and b constant, the return loss was observed by changing ring c. Five data simulation analyses were performed within the range of 5mm-4.5mm with a step size of 0.1mm by changing the radius of ring c. The simulation results are shown below. Figure 6 As shown in the figure, the return loss value gradually decreases as the circle c decreases. Figure 6 As shown in (e), when the diameter of the ring c is reduced to 4.5 mm, S11 < -35 dB, exhibiting good return loss characteristics and significantly improved transmission efficiency. In summary, considering factors such as antenna performance, the antenna structure was ultimately determined to be a three-ring nested structure, with an outer ring radius of 4.5 mm, a middle ring radius of 2.7 mm, and an inner ring radius of 1.3 mm.

[0076] Its working principle: the coplanar waveguide transmits electromagnetic waves through the conducting band, and radiates to the free space after being coupled to the antenna patch. The ground plate provides shielding and current return path. This process realizes efficient conversion and radiation of electrical signals to electromagnetic waves. Therefore, the antenna needs to be matched with the feed line impedance, and the degree of matching directly affects the efficiency of power transmission. The microstrip feed line is located in the center of the top layer of the entire antenna, and is integrally processed with the concentric ring-shaped patch. When the antenna works, the signal is fed in by the top layer of the band feed line, and the top layer of the antenna metal plate and the ground plate and the intermediate layer of the dielectric substrate together form a K-band antenna that meets the application requirements.

[0077] Embodiment 3

[0078] Since the antenna works in free space, in order to make the designed antenna working parameters closer to the actual situation, when analyzing the antenna performance parameters using HFSS (simulation software) after the antenna structure model is created, the boundary conditions of the antenna need to be set as ideal conductor boundary, the radiation boundary surface (i.e. air cavity surface) needs to be at least one quarter wavelength away from the radiator, the bottom surface of the antenna model dielectric substrate needs to be set as an ideal boundary, and the input port of the antenna needs to be set as a lumped port excitation. The antenna is set as a fast sweep type, and its performance in the frequency band of 17.62-19.65GHz is analyzed and calculated.

[0079] The utility model adopts the HFSS full-wave simulation software based on finite element algorithm to simulate the antenna structure, scans in the range of 17.62-19.65GHz, as shown in Figure 7 , referring to the S11 return loss graph of the coplanar waveguide antenna, it can be known that the return loss of the antenna is less than-10dB in the frequency band of 17.62-19.65GHz, and it exhibits good stability in the lower frequency band. It meets the frequency band requirements in part of the K band.

[0080] As shown in Figure 8 , the standing wave ratio of the antenna meets the application requirement of less than 2 in the working frequency band. In terms of gain, the design shows good gain characteristics, referring to the attached Figure 9 , the maximum Gain parameter is all above 12dB in the bandwidth range. The maximum gain generated at 18.16GHz, 18.52GHz and 19.18GHz is 16.64, 15.47 and 14.71dB respectively. It can be seen that the K-band coplanar waveguide ceramic resonant antenna designed by the utility model meets the working conditions in actual application.

[0081] As attached Figure 10 , 11As shown in Figs. 12, 13 and 14, the radiation patterns of the embodiment at 18.16 GHz, 18.52 GHz and 19.18 GHz respectively are obtained, and it is analyzed that the embodiment has good directivity in the frequency band and meets the design requirements.

[0082] The contents not described in detail in the specification of the present application belong to the prior art known to the person skilled in the art. Although the above describes the specific embodiments of the present application for the purpose of facilitating the understanding of the present application by the person skilled in the art, it should be clear that the present application is not limited to the scope of the specific embodiments, and for the person skilled in the art, all the changes that are obvious within the spirit and scope of the present application defined and determined by the appended claims are included in the protection of the present application.

Claims

1. A cavity-backed resonant coplanar waveguide antenna operating in the K-band, characterized in that: The antenna includes a top radiating metal plate (1), a top ground plane (2), an intermediate dielectric substrate (3), and a bottom ceramic resonant cavity (4); The top-layer radiating metal plate (1) is composed of concentric annular patches (1001), circular string structures (1002), rectangular connecting pieces (1003), and feed lines (1004); The concentric annular patch (1001) consists of three circular rings a (1005), b (1006), and c (1007) of different diameters, and three rectangular bridges a (1008), b (1009), and c (1010) of the same width; the three circular rings and the three rectangular bridges are arranged around the same center point O, with the three circular rings centered at the center point O, and the three rectangular bridges are arranged radially around the center point O, with rectangular bridge a (1008) and rectangular bridge c (1010) being the center point O. The angles between b(1009) and between rectangular bridge b(1009) and rectangular bridge c(1010) are all 90°; the circular string structure (1002) is set on the extension line of the axis of symmetry of rectangular bridge b(1009); the rectangular connector (1003) is set on the reverse extension line of the axis of symmetry of rectangular bridge b(1009); the feed line (1004) is set at the end of the long side of the rectangular connector (1003), and the feed line (1004) is set parallel to the rectangular bridge c(1010); The circular string structure (1002) is composed of five overlapping and nested circular patches a (1011), b (1012), c (1013), d (1014), and e (1015) of different diameters. The center of circular patch a (1011) is located on the outer diameter of the ring a (1005), the center of circular patch b (1012) is located on the outer diameter of circular patch c (1013), the center of circular patch c (1013) is located on the outer diameter of circular patch d (1014), and the center of circular patch d (1014) is located on the outer diameter of circular patch e (1015). The centers of the five circular patches are all on the extension line of the axis of symmetry of the rectangular bridge b (1009), thus forming the circular string structure (1002). The top-level ground plane (2) consists of ground plane a (201) and ground plane b (202); ground plane a (201) is L-shaped and ground plane b (202) is rectangular; and ground plane a (201) and ground plane b (202) surround the top-level radiating metal plate (1), and a triangular chamfer is cut off on the inner side of ground plane a (201) near the feed line (1004); The signal is fed into the concentric ring patch (1001) via the feed line (1004), and together with the intermediate dielectric substrate (3) and the top ground plane (2) in the manner of coplanar waveguides, it forms an antenna.

2. The cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The antenna has a frequency band of 17.62GHz-19.65GHz and three resonant points, all of which meet the application requirement of a standing wave ratio of less than 2 within the frequency band.

3. The cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The top-layer radiating metal plate (1) is integrally processed from a copper metal plate.

4. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The dimensions of the chamfered triangle are as follows: the side length of the right-angled side closest to the feed line (1004) is 2mm; the side length of the other right-angled side is 3mm.

5. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The inner diameter of the ring a (1005) is 1.3 mm, and the outer diameter is 2.6 mm; The inner diameter of the ring b (1006) is 4 mm, and the outer diameter is 5.4 mm; The inner diameter of the ring c(1007) is 7mm and the outer diameter is 9mm; The feed line (1004) has dimensions of 9.2mm × 1.2mm; The widths of rectangular bridges a (1008), b (1009), and c (1010) are all 0.5 mm. The width of the rectangular patch (1003) is 1.2 mm.

6. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The diameters of the circular patches a (1011), b (1012), c (1013), d (1014), and e (1015) are 1.4 mm, 1.2 mm, 1.0 mm, 0.8 mm, and 0.6 mm, respectively.

7. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The top-layer ground plane (2) is made of copper. The length of the ground plane a (201) is equal to the length of the intermediate layer dielectric substrate (3). The grounding plate b (202) has a length of 12.8 mm and a width of 3.5 mm.

8. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The intermediate layer dielectric substrate (3) is made of Rogers RO3010 material, which has a relative permittivity of 10.2 and a loss tangent of 0.0035.

9. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The overall dimensions of the intermediate layer dielectric substrate (3) are 19mm × 20mm × 1.6mm.

10. A cavity-backed resonant coplanar waveguide antenna operating in the K-band according to claim 1, characterized in that: The bottom ceramic resonant cavity (4) is made of Al2O3 material, and its overall size is 19mm×20mm×2.3mm.

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