Broadband high-gain transmission array antenna based on single-layer dielectric substrate unit

Abstract

The broadband high-gain transmission array antenna comprises a pyramid horn antenna and a transmission array, the transmission array comprises a plurality of transmission units, and each transmission unit comprises a dielectric substrate, an upper-layer metal patch and a lower-layer metal patch. The upper layer metal patch and the lower layer metal patch respectively etch the upper surface and the lower surface of the dielectric substrate. The upper-layer metal patch and the lower-layer metal patch are each of a sector ring and circular ring stacked structure, and phase regulation and control are achieved by controlling the opening angle of the outermost sector ring. In addition, the 360-degree phase range can be obtained by mirroring the upper metal patch and the lower metal patch. Compared with a traditional high-gain broadband transmission array antenna, the single-layer dielectric substrate is used, metal through holes and metal columns are prevented from being used, the unit structure is simpler, and the profile height is effectively reduced; compared with an existing low-profile transmission array antenna based on a single-layer dielectric substrate unit, the low-profile transmission array antenna has the advantages that the gain bandwidth and the aperture efficiency are remarkably improved, and the application scene is wider.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular to a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit. Background Art

[0002] In the fields of radar communication, aerospace communication, and radio astronomy observation, antennas need to transmit over long distances in a specified direction, so they must have high gain and maintain excellent radiation performance in a wide frequency band. Traditional broadband high-gain transmission array antennas usually use a multi-layer structure to ensure good transmission amplitude and linear phase control. However, based on the requirements of miniaturization and low profile of modern communication systems, it is necessary to gradually reduce the number of layers of the dielectric substrate. In order to ensure good transmission amplitude, metal columns or metal through holes are added, but this will increase the difficulty of processing the antenna. Low-profile transmission array antennas that do not use metal columns or metal through holes will have reduced bandwidth and aperture efficiency performance. Therefore, a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit is an antenna that is worth trying.

[0003] In 2016, Luo Qi et al. proposed a broadband transmission array antenna in the paper “Wideband TransmitarrayWithReducedProfile”. The transmission unit consists of two identical three-layer frequency selective surfaces separated by a quarter-wavelength air gap. In order to further reduce the profile height, in 2019, Yu Shixing et al. proposed a low-profile transmission array antenna in the paper “Low-Profile Transmitarray Lens Antenna of X-Band with One Layer ofSubstrate and Metallic Vias”. The transmission unit is connected to the square metal patches printed on the upper and lower layers of a single-layer dielectric substrate through metallized through-holes. However, these low-profile structures with metallized through-holes have a relatively narrow bandwidth, and the presence of metallized through-holes in the structure increases the difficulty of processing. In 2023, Rao Wei et al. proposed a transmission unit based on a single-layer dielectric substrate in the paper "ADual-Layer Polarisation Rotating Element for Transmitarray Designs". The metal patch is etched on two layers of the dielectric substrate, and no metal columns or metal through-holes are used for connection, which reduces the profile height and processing difficulty. However, its bandwidth and aperture efficiency performance need to be further improved.

[0004] In summary, the existing broadband high-gain transmission array antenna design has problems such as high profile and complex processing, while the bandwidth and aperture efficiency performance of low-profile transmission array antennas need to be improved. Therefore, it is very challenging to design a transmission array antenna that meets the requirements of low profile, high gain, broadband and easy processing. Summary of the invention

[0005] The object of the present invention is to provide a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in order to solve the problems existing in the above-mentioned prior art.

[0006] The technical solution to achieve the purpose of the present invention is: a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit, the antenna comprising a pyramidal horn antenna, a transmission array, a plastic support plate and a plurality of nylon columns; the pyramidal horn antenna is used as a feed source, is located directly below the transmission array, and is fixed to the plastic support plate; the plastic support plate and the transmission array are supported and fixed by the nylon columns; the transmission array comprises a plurality of transmission units, the transmission units comprising an upper metal patch, a dielectric substrate and a lower metal patch arranged in sequence from top to bottom, the dielectric substrate being a single-layer structure; wherein the upper metal patch and the lower metal patch Etched on the upper surface and lower surface of the dielectric substrate respectively, the upper metal patch and the lower metal patch are both fan-ring circular ring superposition structures, the structure includes a first fan-ring metal patch, a second fan-ring metal patch and a circular ring metal patch, the first fan-ring metal patch and the second fan-ring metal patch are relatively arranged to form a virtual circular ring, the first fan-ring metal patch and the second fan-ring metal patch are connected by a straight narrow-band metal patch, the circular ring metal patch is arranged on the inner side of the virtual circular ring, and the circular ring metal patch overlaps with the straight narrow-band metal patch, and the inner diameter of the circular ring metal patch is greater than the width of the straight narrow-band metal patch.

[0007] Furthermore, the first sector ring metal patch and the second sector ring metal patch are arranged opposite to each other.

[0008] Furthermore, the virtual ring and the annular metal patch are arranged cocentrically.

[0009] Furthermore, the central axis of the linear narrow-band metal patch coincides with the central axis of the circular ring metal patch.

[0010] Furthermore, when the transmission unit performs phase compensation, a continuous phase change of 0 to 360° is achieved by performing a horizontal mirror operation.

[0011] Furthermore, the transmission unit includes two states, namely state A and state B. From the top view of the upper metal patch, with the center as the origin, the horizontal left and right directions as the x-axis, and the vertical direction as the z-axis, an o-xyz coordinate system is established;

[0012] For state A: the angle of the central axis of the linear narrow-band metal patch, the annular metal patch and the virtual annulus is: 22.5° counterclockwise rotation based on the center of the upper metal patch and along the z-axis direction; the lower metal patch has the same shape as the upper metal patch and is obtained by rotating the upper metal patch 45° counterclockwise based on the z-axis;

[0013] For state B: the angle of the central axis of the straight narrow-band metal patch, the circular metal patch and the virtual ring is: 22.5° counterclockwise rotated with the center of the upper metal patch and along the z-axis as the reference; the lower metal patch has the same shape as the upper metal patch, and is obtained by rotating the upper metal patch 45° counterclockwise with the z-axis as the reference.

[0014] Furthermore, the opening angles α of the first sector ring metal patch and the second sector ring metal patch are both adjustable to achieve linear phase change of the transmission unit.

[0015] Furthermore, the plurality of transmission units are periodically distributed in a circular array.

[0016] Furthermore, the spacing P between the transmission units is 0.33λ, wherein λ is the free space wavelength corresponding to the set center frequency.

[0017] Furthermore, the dielectric substrate has a thickness H=0.1λ and a dielectric constant of 2.2.

[0018] Compared with the prior art, the present invention has the following significant advantages:

[0019] (1) Compared with the traditional broadband high-gain transmission array antenna, the antenna array of the present invention has only one layer of dielectric substrate and two layers of metal patches, which reduces the air layer and effectively reduces the cross-sectional height of the array.

[0020] (2) Compared with the transmission array antenna with metalized through holes or metal columns, the present invention simplifies the unit structure and is easy to process.

[0021] (3) Compared with the transmission array antenna based on a single-layer dielectric unit without using metal through holes or metal pillars, the bandwidth and aperture efficiency performance of the present invention are greatly improved.

[0022] (4) The fan-ring circular ring stacked metal patch structure designed for the first time in the present invention realizes the polarization twisting function while having good transmission performance, and greatly improves the transmission amplitude and phase shift range of the transmission unit.

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in an embodiment.

[0025] Figure 2 FIG. 1 is a schematic diagram of a transmission unit of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in an embodiment, wherein Figure 2 (a) is a three-dimensional schematic diagram of the transmission unit. Figure 2 (b) is a top view of the upper metal patch. Figure 2 (c) in the figure is a top view of the lower metal patch.

[0026] Figure 3 FIG. 1 is a schematic diagram of a transmission unit state A and a transmission unit state B of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in an embodiment, wherein Figure 3 (a) is the transmission unit state A, Figure 3 (b) in the figure is the transmission unit state B.

[0027] Figure 4 The transmission unit of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in an embodiment is a graph showing the transmission coefficient and phase shift in states A and B at a design frequency of 10 GHz as the opening angle α of the fan ring outside the metal patch changes.

[0028] Figure 5 The transmission unit of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in an embodiment is a graph showing transmission amplitude and phase shift at different incident angles at a design frequency of 10 GHz as the opening angle α of the outer fan ring of the metal patch changes.

[0029] Figure 6 : is the measured and simulated normalized radiation pattern of the E-plane and H-plane of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit at 10 GHz in one embodiment, wherein Figure 6 (a) is the measured and simulated normalized radiation pattern of the E-plane. Figure 6 (b) in the figure is the measured and simulated normalized radiation pattern of the H-plane.

[0030] Figure 7 : is the measured normalized radiation pattern of the E-plane and H-plane of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit at a frequency of 9.4 GHz corresponding to a 1-dB bandwidth in one embodiment, wherein Figure 7(a) is the measured normalized radiation pattern of the transmission array antenna on the E plane at 9.4 GHz. Figure 7 (b) in the figure is the measured normalized radiation pattern of the H-plane of the transmission array antenna at 9.4 GHz.

[0031] Figure 8 : is the measured normalized radiation pattern of the E-plane and H-plane of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit at a frequency of 11.5 GHz corresponding to a 1-dB bandwidth in one embodiment, wherein Figure 8 (a) is the measured normalized radiation pattern of the transmission array antenna on the E plane at 11.5 GHz. Figure 8 (b) in the figure is the measured normalized radiation pattern of the H-plane of the transmission array antenna at 11.5 GHz.

[0032] Fig. 9 The figure is a graph showing the variation of gain and aperture efficiency with frequency of the simulated and measured gain of a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit in one embodiment. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In one embodiment, in combination Figure 1 to Figure 2, provides a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit, the antenna comprising a pyramidal horn antenna 1, a transmission array 2, a plastic support plate 3 and a plurality of nylon columns 4; the pyramidal horn antenna 1 is used as a feed source, is located directly below the transmission array 2, and is fixed on the plastic support plate 3; the plastic support plate 3 and the transmission array 2 are supported and fixed by the nylon columns 4; it is characterized in that the transmission array 2 comprises a plurality of transmission units 5, the transmission unit 5 comprises an upper metal patch 6, a dielectric substrate 7 and a lower metal patch 8 arranged in sequence from top to bottom, the dielectric substrate 7 is a single-layer structure; wherein the upper metal patch 6 and the lower metal patch 8 are The metal patch 8 is etched on the upper surface and the lower surface of the dielectric substrate 7 respectively. The upper metal patch 6 and the lower metal patch 8 are both fan-ring and circular ring superimposed structures, which include a first fan-ring metal patch, a second fan-ring metal patch and a circular ring metal patch. The first fan-ring metal patch and the second fan-ring metal patch are relatively arranged to form a virtual circular ring. The first fan-ring metal patch and the second fan-ring metal patch are connected by a straight narrow-band metal patch. The circular ring metal patch is arranged on the inner side of the virtual circular ring. At the same time, the circular ring metal patch overlaps with the straight narrow-band metal patch, and the diameter of the inner side of the circular ring metal patch is greater than the width of the straight narrow-band metal patch.

[0037] Preferably, in some embodiments, the first fan ring metal patch and the second fan ring metal patch are arranged opposite to each other.

[0038] Preferably, in some embodiments, the virtual ring and the annular metal patch are arranged concentrically.

[0039] Preferably, in some embodiments, the central axis of the linear narrow-band metal patch coincides with the central axis of the circular ring metal patch.

[0040] Furthermore, in one of the embodiments, when the transmission unit 5 performs phase compensation, a continuous phase change of 0 to 360° is achieved by performing a horizontal mirror operation.

[0041] The transmission unit 5 includes two states, namely state A and state B. From the top view of the upper metal patch 6, with the center as the origin, the horizontal left and right direction as the x-axis, and the vertical direction as the z-axis, an o-xyz coordinate system is established;

[0042] For state A: the angles of the central axes of the linear narrow-band metal patch, the annular metal patch and the virtual annulus are: 22.5° counterclockwise rotation based on the center of the upper metal patch 6 and along the z-axis direction; the lower metal patch 8 has the same shape as the upper metal patch 6 and is obtained by rotating the upper metal patch 6 45° counterclockwise based on the z-axis;

[0043] For state B: the angle of the central axis of the linear narrow-band metal patch, the circular metal patch and the virtual circular ring is: 22.5° counterclockwise rotated with the center of the upper metal patch 6 and along the z-axis as the reference; the lower metal patch 8 has the same shape as the upper metal patch 6, and is obtained by rotating the upper metal patch 6 45° counterclockwise with the z-axis as the reference.

[0044] Furthermore, in one of the embodiments, the opening angles α of the first fan-ring metal patch and the second fan-ring metal patch are adjustable to achieve a linear phase change of the transmission unit 5 .

[0045] Furthermore, in one of the embodiments, the plurality of transmission units 5 are periodically distributed in a circular array.

[0046] Furthermore, in one of the embodiments, the spacing P between the transmission units 5 is 0.33λ, wherein λ is the free space wavelength corresponding to the set center frequency.

[0047] Furthermore, in one of the embodiments, the dielectric substrate 7 has a thickness H=0.1λ and a dielectric constant of 2.2.

[0048] As a specific example, the present invention is further described in detail in one of the embodiments.

[0049] This embodiment is a broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit, including a pyramidal horn antenna, a transmission array, a plastic support plate, and a plurality of nylon columns. The pyramidal horn antenna is used as a feed source and is located directly above the transmission array. The specific position is: the vertical distance between the pyramidal horn and the transmission array is 173mm. The aperture surface diameter of the transmission array is 270mm, including 623 transmission units, and the spacing between the transmission units is P = 10mm. Each transmission unit includes an upper metal patch, a dielectric substrate, and a lower metal patch arranged in sequence from top to bottom. Among them, the dielectric constant of the dielectric substrate is 2.2, and the thickness H is 3mm. A fan-ring and circular-ring superimposed metal patch structure is etched on the upper metal patch (6) and the lower metal patch (8) respectively. The metal patch structure includes a first fan-ring metal patch, a second fan-ring metal patch and a circular-ring metal patch. The first fan-ring metal patch and the second fan-ring metal patch are arranged relative to each other to form a virtual circular ring. The first fan-ring metal patch and the second fan-ring metal patch are connected by a straight narrow-band metal patch. The circular-ring metal patch is arranged on the inner side of the virtual circular ring. The circular-ring metal patch overlaps with the straight narrow-band metal patch, and the inner diameter of the circular-ring metal patch is greater than the width of the straight narrow-band metal patch. The inner radius of the first fan-ring metal patch and the second fan-ring metal patch is R1, and the ring width is W1. The inner radius of the virtual circular ring is R2, and the ring width is W2. The width of the straight narrow-band metal patch is W3. Preferably, R1 = 3.5 mm, R2 = 1 mm, W1 = 1.4 mm, W2 = 1.4 mm, and W3 = 1.4 mm. The opening angle α of the outer fan ring is variable to achieve linear phase change of the transmission unit, and the range of the angle α is 18° to 52°.

[0050] Depend on Figure 3 It can be seen that the lower metal patch 8 is obtained by rotating the upper metal patch 6 counterclockwise by 45° based on the z-axis. The upper and lower metal patches of State A are mirrored to obtain the structure shown in State B.

[0051] Depend on Figure 4 It can be seen that the transmission amplitude and phase of the transmission unit 5 at 10GHz change with the opening angle α of the outer fan ring. The transmission amplitude is always greater than -2.6dB, StateA can achieve a phase range of 0° to 180°, and the phase of State B differs from that of StateA by 180°, and can achieve a phase range of 0° to -180°. A total phase range of 360° can be achieved, which has good unit performance.

[0052] Depend on Figure 5It can be seen that at 10 GHz, the transmission amplitude of the transmission unit 5 is basically above -3 dB in the cases of different sizes and different incident angles, which shows that this unit has good transmission capability and is less affected by changes in the incident angle.

[0053] Depend on Figure 6 It can be seen that when the design frequency is 10 GHz, the simulated and measured radiation patterns of the E-plane and H-plane of the transmission array antenna are in good agreement. The test results show that the sidelobe level and cross-polarization of the E-plane are -28 dB and -29.3 dB respectively, and the sidelobe level and cross-polarization of the H-plane are -28.2 dB and -28.4 dB respectively.

[0054] Depend on Figures 7 and 8 It can be seen that the simulated and measured radiation patterns of the E and H planes of the transmission array antenna at the 1-dB bandwidth corresponding to the frequency points of 9.4 GHz and 11.5 GHz are in good agreement. The test results show that at 9.4 GHz, the sidelobe levels of the E and H planes are both lower than -28.2 dB, and the cross-polarization is lower than -26 dB; at 11.5 GHz, the sidelobe levels of the E and H planes are both lower than -27.5 dB, and the cross-polarization is lower than -20 dB. The transmission array antenna can maintain a stable and good radiation pattern in a wider frequency band.

[0055] Fig. 9 The following is a measurement and simulation curve of the gain and aperture efficiency of the transmission array antenna as it changes with frequency. At the center frequency of 10 GHz, the simulated gain of the antenna is 27.12 dBi, the maximum aperture efficiency is 60.7%, the maximum gain appears at 10.1 GHz, which is 27.18 dBi, the 1-dB gain bandwidth is 23.1% (9.45-11.79 GHz), and the 3-dB gain bandwidth is 37.3% (8.88-12.64 GHz). The measured gain of the antenna at 10 GHz is 26.98 dBi, which is the maximum gain, the maximum aperture efficiency is 58.7%, the 1-dB gain bandwidth is 22.5% (9.4-11.65 GHz), and the 3-dB gain bandwidth is 35% (8.95-12.45 GHz). The measurement results are consistent with the simulation results.

[0056] In summary, the transmission unit based on a single-layer dielectric substrate proposed in the present invention can achieve a transmission amplitude greater than -2.6dB and a 360° phase shift range at a design frequency of 10GHz in a low-profile case, which simplifies the structure, reduces the cost, avoids the metallized through holes required in the existing low-profile single-layer dielectric substrate design, and at the same time ensures the broadband and high gain performance of the transmission array antenna.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit, the antenna comprising a pyramidal horn antenna (1), a transmission array (2), a plastic support plate (3) and a plurality of nylon columns (4); the pyramidal horn antenna (1) is used as a feed source, is located directly below the transmission array (2), and is fixed on the plastic support plate (3); the plastic support plate (3) and the transmission array (2) are supported and fixed by the nylon columns (4); characterized in that: The transmission array (2) comprises a plurality of transmission units (5), wherein the transmission units (5) comprise an upper metal patch (6), a dielectric substrate (7) and a lower metal patch (8) which are arranged in sequence from top to bottom, wherein the dielectric substrate (7) is a single-layer structure; wherein the upper metal patch (6) and the lower metal patch (8) are respectively etched on the upper surface and the lower surface of the dielectric substrate (7), and both the upper metal patch (6) and the lower metal patch (8) are fan-ring circular ring superposition structures, and the structure comprises a first fan-ring A metal patch, a second fan-ring metal patch and a ring-shaped metal patch. The first fan-ring metal patch and the second fan-ring metal patch are relatively arranged to form a virtual ring. The first fan-ring metal patch and the second fan-ring metal patch are connected by a straight narrow-band metal patch. The ring-shaped metal patch is arranged on the inner side of the virtual ring. At the same time, the ring-shaped metal patch overlaps with the straight narrow-band metal patch, and the inner diameter of the ring-shaped metal patch is greater than the width of the straight narrow-band metal patch.

2. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: The first sector ring metal patch and the second sector ring metal patch are arranged opposite to each other.

3. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: The virtual ring and the annular metal patch are arranged cocentrically.

4. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 3, characterized in that: The central axis of the linear narrow-band metal patch coincides with the central axis of the circular ring metal patch.

5. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: When the transmission unit (5) performs phase compensation, a continuous phase change of 0 to 360° is achieved by performing a horizontal mirror operation.

6. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 5, characterized in that: The transmission unit (5) includes two states, namely state A and state B. From the top view of the upper metal patch (6), with the center as the origin, the horizontal left and right directions as the x-axis, and the vertical direction as the z-axis, an o-xyz coordinate system is established; For state A: the angles of the central axes of the linear narrow-band metal patch, the annular metal patch and the virtual annular ring are: 22.5° counterclockwise rotation based on the center of the upper metal patch (6) and along the z-axis direction; the lower metal patch (8) has the same shape as the upper metal patch (6) and is obtained by rotating the upper metal patch (6) 45° counterclockwise based on the z-axis; For state B: the angles of the central axes of the linear narrow-band metal patch, the annular metal patch and the virtual annulus are: 22.5° counterclockwise rotated with respect to the center of the upper metal patch (6) and along the z-axis direction; the lower metal patch (8) has the same shape as the upper metal patch (6) and is obtained by rotating the upper metal patch (6) 45° counterclockwise with respect to the z-axis.

7. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: The opening angles α of the first sector ring metal patch and the second sector ring metal patch are both adjustable, so as to realize the linear phase change of the transmission unit (5).

8. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: The plurality of transmission units (5) are distributed periodically in a circular array.

9. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 8, characterized in that: The spacing P between the transmission units (5) is 0.33λ, wherein λ is the free space wavelength corresponding to the set center frequency.

10. The broadband high-gain transmission array antenna based on a single-layer dielectric substrate unit according to claim 1, characterized in that: The dielectric substrate (7) has a thickness of H=0.1λ and a dielectric constant of 2.2.

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