A miniaturized beam-scanning FP resonant cavity antenna with improved broadband gain characteristics

Abstract

This invention discloses a miniaturized beam-scanning (FP) resonant cavity antenna with broadband gain improvement characteristics, comprising a PRS layer, a feed, a vertical metal ground, and a horizontal reflector placed below and parallel to the PRS layer. The feed is a monopole antenna positioned below the PRS layer. The upper edge of the vertical metal ground coincides with one edge of the lower surface of the PRS layer, and the lower edge of the vertical metal ground coincides with one edge of the horizontal reflector. The PRS layer and the horizontal reflector form a resonant cavity, one side of which is covered by the vertical metal ground. The feed is positioned in the center of the vertical metal ground, which serves as the ground plane for the feed antenna. This antenna extends the impedance bandwidth and improves the gain of the feed antenna over a wide range, exhibiting a wide 3dB gain bandwidth and gain improvement bandwidth. Simultaneously, the antenna maintains a small size and has a frequency scanning capability of approximately 0–37°, greatly expanding its application scenarios.

Description

Technical Field

[0001] This invention belongs to the field of FP resonant cavity antenna technology, specifically relating to a miniaturized beam-scanning Fabry-Perot (FP) resonant cavity antenna with broadband gain improvement characteristics. Background Technology

[0002] In recent years, with the rapid development of antenna technology, FP resonant cavity antennas have been used by researchers to improve antenna gain due to their advantages such as high efficiency, high gain, simple structure and ease of manufacturing.

[0003] A typical FP resonant cavity antenna consists of three parts: a feed, a metallic ground, and a partially reflecting surface (PRS). Electromagnetic waves emitted from the feed undergo multiple reflections and transmissions between the ground and the PRS. Simultaneously, the transmitted electromagnetic waves superimpose in phase on the outer surface of the PRS, thereby increasing the antenna's gain. However, because FP resonant cavity antennas are a type of cavity antenna, their 3dB gain bandwidth is very narrow, and their size is generally large, significantly limiting their application in many practical situations. Therefore, expanding the bandwidth of FP resonant cavity antennas while simultaneously achieving miniaturization presents a challenge for antenna designers.

[0004] Currently, many researchers are attempting to utilize FP resonant cavities to improve antenna gain and extend gain bandwidth. For example, patent CN114843792A proposes a broadband FP resonant cavity antenna in which the PRS layer and feed source form a broadband resonance within the antenna cavity. This invention achieves a 3dB gain bandwidth of 8.8–11.2 GHz, with a relative bandwidth of 24%, which is relatively narrow. Patent CN115084845A proposes another broadband FP resonant cavity antenna. In this invention, the PRS layer is composed of honeycomb-arranged PRS units, achieving a 3dB gain bandwidth of 7.96–11.04 GHz, with a relative bandwidth of 32.4%, but the 3dB gain bandwidth extension effect is not good. Patent CN113067165B discloses a broadband miniaturized FP resonant cavity antenna. The antenna's PRS layer consists of two dielectric substrates and four layers of periodically arranged hexagonal metal patch elements, exhibiting a relative impedance bandwidth of 34.2%, a relative 3dB gain bandwidth of 34.3%, and dimensions of 1.84 × 1.84 × 0.63λ. 3 The antenna's structural design is relatively complex, the 3dB gain bandwidth improvement is very limited, and it does not achieve the goal of miniaturization of the antenna well.

[0005] The above solutions all utilize FP resonant cavity antennas to improve gain and increase gain bandwidth. However, the publicly disclosed FP resonant cavity antennas have limited effect on widening the 3dB gain bandwidth, and the antenna size is large, limiting their practical application scenarios. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics. This antenna extends the impedance bandwidth of the feed antenna and improves the gain of the feed antenna in a wide range, with a wide 3dB gain bandwidth and gain improvement bandwidth. At the same time, the antenna maintains a small size and has a frequency scanning function of about 0 to 37°, which greatly expands the application scenarios of the antenna.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics includes a PRS layer, a feed source, a vertical metal ground, and a horizontal reflector placed below the PRS layer and parallel to the PRS layer.

[0009] The feed source is a monopole antenna located below the PRS layer;

[0010] The vertical metal ground edge coincides with one side edge of the lower surface of the PRS layer, and the vertical metal underground edge coincides with one side edge of the horizontal reflective surface;

[0011] The PRS layer and the horizontal reflector form a resonant cavity. One side of the cavity is covered by a vertical metal ground. The feed is located in the center of the vertical metal ground, which serves as the ground for the feed antenna.

[0012] To optimize the above technical solution, the specific measures also include:

[0013] The aforementioned PRS layer is composed of several partial reflective units. Each partial reflective unit includes a first dielectric substrate, a second dielectric substrate, a first lower metal patch and a second lower metal patch disposed on the lower surface of the first dielectric substrate, and a first upper metal patch and a second upper metal patch disposed on the upper surface of the first dielectric substrate. The second dielectric substrate is stacked on the first dielectric substrate. The first lower metal patch and the second lower metal patch are respectively an outer square ring with an opening and an inner square ring with an opening. The first upper metal patch and the second upper metal patch are respectively a large square metal patch located at the center and four small square metal patches distributed at the four corners of the large square.

[0014] The aforementioned feed source includes a feed port, a rectangular radiating patch, and a first dielectric substrate. The feed port and the rectangular radiating patch are disposed on the upper surface of the first dielectric substrate. One side of the feed port is connected to a vertical metal ground, and the other side is connected to the rectangular radiating patch. The first dielectric substrate is vertically disposed at the center of the vertical metal ground.

[0015] The aforementioned horizontal reflective surface includes a square metal surface and a second dielectric plate, wherein the square metal surface is disposed on the upper surface of the second dielectric plate.

[0016] The thickness t1 of the first dielectric substrate is 1.9 mm, the thickness t2 of the second dielectric substrate is 1.27 mm, the thickness t3 of the first dielectric plate is 0.508 mm, the length L3 is 7.5 mm, the width W4 is 5 mm, the thickness t4 of the second dielectric plate is 0.508 mm, the side length of the square metal surface is L4 = 51 mm, the height h1 of the first dielectric plate from the square metal surface is 11 mm, the height hc of the vertical metal ground is 22 mm, the length L5 is 51 mm, and the length and width of the first dielectric plate, the second dielectric plate, and the second dielectric plate are all L4 = 51 mm.

[0017] The side length P of each of the aforementioned partial reflective units is 17mm. The outer side length L1 of the outer square ring is 17mm. The distance S2 between the outer and inner sides of the outer square ring is 2mm. The outer square ring includes two openings, one of which has a center distance d3 = 7.5mm from the boundary of the partial reflective unit. The opening length of the outer square ring is d1 = 2.5mm, and the width is W1 = 1.5mm. The two openings of the outer square ring are centrally symmetrical about the center of the partial reflective unit. The outer side length L2 of the inner square ring is 12.5mm. The distance S1 between the outer and inner sides of the inner square ring is 1mm. The inner square ring includes two openings, one of which has a center distance d3 = 7.5mm from the boundary of the partial reflective unit. The distance d3 = 7.5 mm between the center of the opening and the boundary of the partial reflective unit; the opening length of the inner square ring is d1 = 2.5 mm and the width is S1 = 1 mm; the two openings of the inner ring are centrally symmetrical about the center of the partial reflective unit; the side length W2 of the large square metal patch is 2 mm, and it is set at the center of the partial reflective unit; the side length W3 = 1 mm of the four small square metal patches are set around the large square metal patch, respectively opposite to the four corners of the large square metal patch; the lateral spacing d2 and the longitudinal spacing d4 between the small square metal patches and the central large square metal patch are both 0.1 mm.

[0018] The aforementioned feed source is a rectangular monopole antenna, which is disposed on the upper surface of the first dielectric substrate. The feed port has a length of Lport = 1 mm, and the radiating metal patch has a length of Lpatch = 6.5 mm and a width of W4 = 5 mm.

[0019] The first and second dielectric substrates mentioned above are both made of Rogers TMM6 material with a dielectric constant of 6, and both the first and second dielectric substrates are made of Taconic TLY material with a dielectric constant of 2.2.

[0020] The aforementioned FP resonant cavity antenna has an impedance bandwidth of 6.51–15.9 GHz and a relative bandwidth of 84%, a 3 dB gain bandwidth of 7.07–12.24 GHz and a relative bandwidth of 54%, and a projected area of ​​51 × 51 mm. 2 The profile height is 25.68 mm; the frequency scanning angle is approximately 0–37°.

[0021] The present invention has the following beneficial effects:

[0022] The antenna structure of this invention includes a partial reflective surface (PRS) layer, a feed source, a vertical metal ground, and a horizontal reflective surface. The PRS layer mainly consists of 3×3 partially reflective elements, including upper and lower metal patches. The horizontal reflective surface and the PRS layer form a cavity, one side of which is sealed by the vertical metal ground. The feed source is placed at the center of the vertical metal ground, and the horizontal reflective surface is below the feed source. Capacitive coupling occurs between the metal patches of the PRS layer when the feed source radiates, resulting in multiple resonant points, which further widens the impedance bandwidth of the antenna. At the same time, the PRS layer can achieve in-phase superposition of transmitted waves over a wide range, which can improve the antenna gain while achieving a wide 3dB gain bandwidth.

[0023] 1. Compared with traditional FP resonant cavity antennas, the FP resonant cavity antenna of this invention has a wider gain improvement characteristic, which can realize in-phase superposition of transmitted waves over a wide bandwidth and improve the gain over a wide frequency band. Ultimately, the 3dB gain bandwidth achieved by this invention is 7.07–12.24 GHz, with a relative 3dB gain bandwidth of 54%, and the gain improvement bandwidth is 3.3–15.9 GHz, with a relative bandwidth of 131.3%.

[0024] 2. The PRS layer designed in this invention has good spread spectrum function. The metal patches in the PRS layer can generate effective capacitive coupling, realizing resonance in a wide range and greatly widening the impedance bandwidth of the feed antenna. After adding the PRS layer, the impedance bandwidth is increased from 7.68~13.25GHz (relative bandwidth 52.2%) to 6.51~15.9GHz (relative bandwidth 84%), which is a wider operating bandwidth compared with other FP resonant cavity antennas.

[0025] 3. The FP resonant cavity antenna of this invention is smaller in size than the traditional FP resonant cavity antenna (size is 1.2 × 1.2 × 0.6λ). 3 The area is 51×51mm (1.2×1.2λ). 2With a cross-sectional height of 25.68mm (0.60λ), it has a smaller volume, thus occupying less space, being more compact, having a simple structure, and being easy to process.

[0026] 4. The vertical metal ground of this invention reflects electromagnetic waves, enabling the antenna to have frequency scanning characteristics within the 7.07–12.24 GHz operating frequency band. It can achieve main beam scanning function within an angle range of 0–37°, expanding the application scenarios of the antenna and making it highly valuable in fields such as satellite communication and radar. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the FP resonant cavity antenna according to an embodiment of the present invention;

[0028] Figure 2 This is a front view of the FP resonant cavity antenna according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of a portion of the reflective unit structure according to an embodiment of the present invention;

[0030] Figure 4 This is a top view of a portion of the reflective unit according to an embodiment of the present invention;

[0031] Figure 5 This is a partial side view of the reflective unit according to an embodiment of the present invention;

[0032] Figure 6 This is a top view of the feed antenna according to an embodiment of the present invention;

[0033] Figure 7 This is diagram S11 of the FP resonant cavity antenna of the present invention;

[0034] Figure 8 The peak gain diagrams for the FP resonant cavity antenna and feed antenna of the present invention are shown.

[0035] Figure 9 The radiation pattern of the FP resonant cavity antenna of the present invention at 7.07 GHz;

[0036] Figure 10 The radiation pattern of the FP resonant cavity antenna of the present invention at 9 GHz;

[0037] Figure 11 The radiation pattern of the FP resonant cavity antenna of the present invention at 12.24 GHz;

[0038] The reference numerals in the attached figures are: 1-first dielectric substrate, 2-second dielectric substrate, 3-first dielectric plate, 4-second dielectric plate, 5-first lower metal patch, 6-second lower metal patch, 7-first upper metal patch, 8-second upper metal patch, 9-feed port, 10-rectangular radiating patch, 11-vertical metal ground, 12-horizontal reflective surface. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0040] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0041] like Figure 1-6 As shown, the present invention provides a miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics, comprising a PRS layer, a feed source, a vertical metal ground 11, and a horizontal reflector 12 placed below the PRS layer and parallel to the PRS layer.

[0042] The feed source is a monopole antenna located below the PRS layer;

[0043] The upper edge of the vertical metal ground 11 coincides with one edge of the lower surface of the PRS layer, and the lower edge of the vertical metal ground 11 coincides with one edge of the horizontal reflective surface 12.

[0044] The PRS layer and the horizontal reflector 12 form a resonant cavity. One side of the cavity is covered by a vertical metal ground 11. The feed is located in the center of the vertical metal ground 11, which serves as the ground for the feed antenna.

[0045] In this embodiment, the PRS layer is composed of several partial reflective units, each consisting of a 3×3 partial reflective unit. Each partial reflective unit includes a first dielectric substrate 1, a second dielectric substrate 2, a first lower metal patch 5 and a second lower metal patch 6 disposed on the lower surface of the first dielectric substrate 1, and a first upper metal patch 7 and a second upper metal patch 8 disposed on the upper surface of the first dielectric substrate 1. The second dielectric substrate 2 is stacked on the first dielectric substrate 1. The first lower metal patch 5 and the second lower metal patch 6 are respectively an outer square ring with an opening and an inner square ring with an opening. The first upper metal patch 7 and the second upper metal patch 8 are respectively a large square metal patch located at the center and four small square metal patches distributed at the four corners of the large square.

[0046] In this embodiment, the feed source includes a power supply port 9, a rectangular radiating patch 10, and a first dielectric plate 3. The power supply port 9 and the rectangular radiating patch 10 are disposed on the upper surface of the first dielectric plate 3. One side of the power supply port 9 is connected to a vertical metal ground 11, and the other side is connected to the rectangular radiating patch 10. The first dielectric plate 3 is vertically disposed in the center of the vertical metal ground 11.

[0047] In this embodiment, the horizontal reflective surface 12 includes a square metal surface and a second dielectric plate 4, wherein the square metal surface is disposed on the upper surface of the second dielectric plate 4.

[0048] In this embodiment, the thickness t1 of the first dielectric substrate 1 is 1.9 mm, the thickness t2 of the second dielectric substrate 2 is 1.27 mm, the thickness t3 of the first dielectric plate 3 is 0.508 mm, the length L3 is 7.5 mm, the width W4 is 5 mm, the thickness t4 of the second dielectric plate 4 is 0.508 mm, the side length of the square metal surface is L4 = 51 mm, the height h1 of the first dielectric plate 3 from the square metal surface is 11 mm, the height hc of the vertical metal ground 11 is 22 mm, the length L5 is 51 mm, and the length and width of the first dielectric plate 1, the second dielectric plate 2, and the second dielectric plate 4 are all L4 = 51 mm.

[0049] In this embodiment, the side length P of a single partial reflective unit is 17mm, the outer side length L1 of the outer ring is 17mm, the distance S2 between the outer and inner sides of the outer ring is 2mm, the outer ring includes two openings, the distance d3 = 7.5mm between the center of one opening and the boundary of the partial reflective unit, the length of the opening of the outer ring is d1 = 2.5mm, and the width is W1 = 1.5mm. The two openings of the outer ring are centrally symmetrical about the center of the partial reflective unit, that is, the other outer ring opening is centrally symmetrical with the outer ring opening about the center of the partial reflective unit.

[0050] The outer side length L2 of the inner square ring is 12.5 mm, the distance S1 between the outer and inner sides of the inner square ring is 1 mm, the inner square ring includes two openings, the distance d3 = 7.5 mm between the center of one opening and the boundary of the partial reflective unit, the length of the opening of the inner square ring is d1 = 2.5 mm, and the width is S1 = 1 mm. The two openings of the inner ring are centrally symmetrical about the center of the partial reflective unit, that is, the other inner ring opening is centrally symmetrical with the inner ring opening about the center of the partial reflective unit.

[0051] The large square metal patch has a side length W2 of 2mm and is located at the center of the partial reflective unit. The four small square metal patches have a side length W3 of 1mm and are located around the large square metal patch, respectively opposite to the four corners of the large square metal patch. The horizontal distance d2 and the vertical distance d4 between the small square metal patches and the central large square metal patch are both 0.1mm.

[0052] In this embodiment, the feed source is a rectangular monopole antenna disposed on the upper surface of the first dielectric substrate 3, the feed port 9 has a length of Lport = 1mm, and the radiating metal patch 10 has a length of Lpatch = 6.5mm and a width of W4 = 5mm.

[0053] In this embodiment, both the first dielectric substrate 1 and the second dielectric substrate 2 are made of Rogers TMM6 material with a dielectric constant of 6, and both the first dielectric plate 3 and the second dielectric plate 4 are made of Taconic TLY material with a dielectric constant of 2.2.

[0054] Figure 7 The S11 plot shows the impedance matching of this miniaturized beam-scanning FP resonator antenna with improved broadband gain characteristics. The S11 curve reflects the overall impedance matching of the antenna. After adding the PRS layer, the impedance bandwidth of the antenna was extended from 7.68–13.25 GHz (52.2%) to 6.51–15.9 GHz (84%). From the 6.51–15.9 GHz frequency range, the S11 is less than -10 dB, indicating that the antenna has good impedance matching over a wide bandwidth.

[0055] Figure 8 The peak gain curves of this antenna and the feed antenna show that the 3dB gain bandwidth of this antenna is 7.07–12.24 GHz, with a relative bandwidth of 54%, significantly widening the gain bandwidth of the FP resonant cavity antenna, demonstrating the broadband advantage of this patent. Furthermore, compared to the peak gain curve of the feed antenna, this antenna achieves gain improvement throughout its operating bandwidth. The projected area of ​​this miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics is 51 × 51 mm. 2 (1.2×1.2λ 2The cross-sectional height is 25.68mm (0.60λ), which occupies relatively less space, indicating that this patent has the characteristics of miniaturization.

[0056] Figures 9-11 The radiation patterns of the antenna at 7.07 GHz, 9 GHz, and 12.24 GHz show that as the frequency increases, the main beam gradually shifts to the right from about 0°, realizing the beam scanning function. The scanning angle within the operating frequency band is about 0 to 37°, indicating that this patent has the characteristic of frequency scanning.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics, characterized in that: The FP resonant cavity antenna includes a PRS layer, a feed source, a vertical metal ground (11), and a horizontal reflector (12) placed below the PRS layer and parallel to the PRS layer. The feed source is a monopole antenna located below the PRS layer; The upper edge of the vertical metal ground (11) coincides with one side edge of the lower surface of the PRS layer, and the lower edge of the vertical metal ground (11) coincides with one side edge of the horizontal reflective surface (12). The PRS layer and the horizontal reflector (12) form a resonant cavity. One side of the cavity is covered by a vertical metal ground (11). The feed is located in the center of the vertical metal ground (11), which serves as the ground for the feed antenna. The PRS layer is composed of several partial reflective units. The partial reflective units include a first dielectric substrate (1), a second dielectric substrate (2), a first lower metal patch (5) and a second lower metal patch (6) disposed on the lower surface of the first dielectric substrate (1), and a first upper metal patch (7) and a second upper metal patch (8) disposed on the upper surface of the first dielectric substrate (1). The second dielectric substrate (2) is stacked on the first dielectric substrate (1). The first lower metal patch (5) and the second lower metal patch (6) are respectively an outer square ring with an opening and an inner square ring with an opening. The first upper metal patch (7) and the second upper metal patch (8) are respectively a large square metal patch located at the center and four small square metal patches distributed at the four corners of the large square. The side length P of a single partial reflective unit is 17mm. The outer side length L1 of the outer square ring is 17mm. The distance S2 between the outer and inner sides of the outer square ring is 2mm. The outer square ring includes two openings, one of which has a center distance d3 = 7.5mm from the boundary of the partial reflective unit. The opening length of the outer square ring is d1 = 2.5mm, and the width is W1 = 1.5mm. The two openings of the outer square ring are centrally symmetrical about the center of the partial reflective unit. The outer side length L2 of the inner square ring is 12.5mm. The distance S1 between the outer and inner sides of the inner square ring is 1mm. The inner square ring includes two openings, one of which... The distance d3 between the center and the boundary of the partial reflective unit is 7.5mm. The opening length of the inner ring is d1 = 2.5mm and the width is S1 = 1mm. The two openings of the inner ring are centrally symmetrical about the center of the partial reflective unit. The side length W2 of the large square metal patch is 2mm, and it is set at the center of the partial reflective unit. The side length W3 of the four small square metal patches is 1mm, and they are set around the large square metal patch, respectively opposite to the four corners of the large square metal patch. The horizontal distance d2 and the vertical distance d4 between the small square metal patches and the central large square metal patch are both 0.1mm.

2. The miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to claim 1, characterized in that, The feed source includes a power supply port (9), a rectangular radiating patch (10), and a first dielectric plate (3). The power supply port (9) and the rectangular radiating patch (10) are disposed on the upper surface of the first dielectric plate (3). One side of the power supply port (9) is connected to the vertical metal ground (11), and the other side is connected to the rectangular radiating patch (10). The first dielectric plate (3) is vertically disposed in the center of the vertical metal ground (11).

3. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to claim 2, characterized in that, The horizontal reflective surface (12) includes a square metal surface and a second dielectric plate (4), wherein the square metal surface is disposed on the upper surface of the second dielectric plate (4).

4. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to claim 3, characterized in that, The thickness t1 of the first dielectric substrate (1) is 1.9 mm, the thickness t2 of the second dielectric substrate (2) is 1.27 mm, the thickness t3 of the first dielectric plate (3) is 0.508 mm, the length L3 is 7.5 mm, the width W4 is 5 mm, the thickness t4 of the second dielectric plate (4) is 0.508 mm, the side length of the square metal surface is L4 = 51 mm, the height h1 of the first dielectric plate (3) from the square metal surface is 11 mm, the height hc of the vertical metal ground (11) is 22 mm, the length L5 is 51 mm, and the length and width of the first dielectric substrate (1), the second dielectric substrate (2), and the second dielectric plate (4) are all L4 = 51 mm.

5. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to claim 3, characterized in that, The feed source is a rectangular monopole antenna, which is disposed on the upper surface of the first dielectric substrate (3). The feed port (9) has a length of Lport = 1mm, and the rectangular radiating patch (10) has a length of Lpatch = 6.5mm and a width of W4 = 5mm.

6. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to claim 3, characterized in that, The first dielectric substrate (1) and the second dielectric substrate (2) are both made of Rogers TMM6 material with a dielectric constant of 6. The first dielectric plate (3) and the second dielectric plate (4) are both made of Taconic TLY material with a dielectric constant of 2.

2.

7. A miniaturized beam-scanning FP resonant cavity antenna with broadband gain improvement characteristics according to any one of claims 1-6, characterized in that, The FP resonant cavity antenna has an impedance bandwidth of 6.51–15.9 GHz and a relative bandwidth of 84%, a 3 dB gain bandwidth of 7.07–12.24 GHz and a relative bandwidth of 54%, and a projected area of ​​51 × 51 mm. 2 The profile height is 25.68 mm; the frequency scanning angle is 0–37°.

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