Low-loss high-conversion-efficiency and high-bandwidth dual-circular-polarization terahertz antenna

Abstract

The low-loss high-conversion-efficiency and high-bandwidth dual-circular-polarization terahertz antenna comprises an orthogonal converter and a horn antenna, the other end of a first rectangular waveguide and the other end of a second rectangular waveguide are combined into a third port, and a step partition plate is arranged between the first rectangular waveguide and the second rectangular waveguide on the front side of the third port. The horn antenna is fixed on the orthogonal converter through a fixing part, a through hole is formed in the fixing part, the pyramid horn antenna is communicated with the third port through the through hole in the fixing part, a plurality of layers of square-like steps are arranged in the through hole, the plurality of layers of square-like steps are composed of at least four layers of steps, and the cross section of each layer of step is a quadrangle with arc-shaped end angles, namely a square-like shape. In the direction from the orthogonal converter to the horn antenna, the sectional area of each square-like step is gradually increased, and the arc radius of each square-like step is gradually increased and is closer to a circle. The antenna has the characteristics of wide bandwidth, low reflection loss and high energy transmission efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of terahertz technology and application, and particularly relates to a dual circularly polarized terahertz antenna with low loss, high conversion efficiency and high bandwidth. BACKGROUND

[0002] Terahertz waves are electromagnetic waves between infrared rays and microwaves (0.1 THz-10 THz), which are an interdisciplinary subject between electronics and optics, and have unique properties such as penetration, low energy and fingerprint spectrum, and have important and wide applications in the fields of material science, aerospace, biomedicine, nondestructive testing, radar communication, cultural heritage protection and astronomy. Terahertz technology has good penetration for many non-polar materials such as ceramics, leather, paper, rubber and polymer coatings, and can measure the thickness and internal structure or defects of the above-mentioned materials, and has irreplaceable nature in the fields of polymer and coating detection, aerospace material and coating detection, automobile coating detection, lithium battery coating detection and wind power coating and material defect detection, and shows strong industrial application prospects. Although the wideband terahertz time-domain spectroscopy technology (THz-TDS) currently occupies a dominant position in the above applications, but because THz-TDS uses a fiber femtosecond laser to excite a photoconductive antenna to generate terahertz radiation, the energy of the terahertz pulse is very low (nJ level), and the absorption of the measured sample to the high-frequency terahertz wave is serious, so the maximum thickness measurement of THz-TDS is usually limited to the millimeter level, which cannot meet the requirements of large thickness, high precision sample layer thickness and internal defect measurement.

[0003] The terahertz wave of the all-electronic frequency-modulated continuous wave (FMCW) terahertz system is generated by solid-state electronic devices, and its power is much higher than that of the THz-TDS system, which can realize high dynamic range, large thickness and high-speed sample thickness measurement, and through special data processing combined with precise calibration method, it can realize thickness measurement higher than the Rayleigh resolution limit and large thickness, which is the current research hotspot in China. The all-electronic frequency-modulated continuous wave (FMCW) terahertz nondestructive testing system can also be used in the fields of polymer and coating detection, aerospace material and coating detection, automobile coating detection, lithium battery coating detection and wind power coating and material defect detection, and has good complementarity with the THz-TDS system.

[0004] In an all-electronic frequency-modulated continuous wave (FMCW) terahertz system, a dual circularly polarized terahertz antenna is a core component, which functions to efficiently transmit and receive terahertz wave signals. The traditional dual circularly polarized millimeter wave (terahertz wave) antenna directly connects between a rectangular waveguide and a circular waveguide (a conical horn mouth), which is not smooth, resulting in poor impedance matching of the rectangular waveguide to the circular waveguide transition, large reflection loss (such as reflection coefficient S11), and low energy transmission efficiency. Moreover, the existing dual circularly polarized terahertz antennas are mostly theoretical models, which are difficult to realize direct application through processing. The present application proposes a multi-layer gradient stacking connection method between a rectangular waveguide and a circular waveguide based on numerical simulation, each edge of each layer of rectangular structure is connected through a circular arc transition, and the size of each layer of rectangular structure is gradually increased, so that the impedance between the rectangular waveguide and the circular waveguide is well matched. A dual circularly polarized terahertz antenna is designed and developed, compared with the traditional dual circularly polarized millimeter wave antenna, the bandwidth of the antenna reaches 32GHz, the reflection loss is reduced by 5dB, and the energy transmission efficiency is increased by more than 30%.

[0005] In the field of wideband terahertz radar and 6G communication, the exploration and use of terahertz wave band and related devices have become an indispensable part of the development of contemporary high-tech industries. Under the technical background of wideband terahertz radar and 6G communication pursuing higher transmission rate and wider channel capacity, the terahertz wave band antenna responsible for signal transmission and reception needs to have higher gain, lower loss and wider bandwidth. The traditional terahertz antenna cannot meet the requirements in terms of loss and size, and the present application meets all the requirements of wideband terahertz radar and 6G communication for antennas and can be used in the field of wideband terahertz radar and 6G communication. SUMMARY

[0006] The purpose of the present application is to provide a dual circularly polarized terahertz antenna with low loss, high conversion efficiency and high bandwidth. Compared with the traditional terahertz wave antenna, the reflection loss of the present antenna is reduced by 5dB, and the energy transmission efficiency is increased by more than 30%, which improves the design method of the core component-antenna for FMCW frequency-modulated continuous wave thickness measurement, wideband terahertz radar and 6G terahertz communication applications.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0008] The application discloses a low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna, which comprises an orthogonal converter and a horn antenna, the orthogonal converter comprises a first rectangular waveguide, a second rectangular waveguide, a stepped partition, a first port, a second port and a third port, one end of the first rectangular waveguide is the first port, one end of the second rectangular waveguide is the second port, the other end of the first rectangular waveguide and the other end of the second rectangular waveguide are combined into the third port, the stepped partition is arranged between the first rectangular waveguide and the second rectangular waveguide on the front side of the third port, the horn antenna comprises a corner-pyramid horn antenna, a fixed part and a multilayer square-like ladder, the horn antenna is fixed on the orthogonal converter through the fixed part, a through hole is formed in the fixed part, the corner-pyramid horn antenna is communicated with the third port through the through hole in the fixed part, the multilayer square-like ladder is arranged in the through hole, the multilayer square-like ladder is composed of at least four layers of steps, the cross section of each layer of step is a quadrilateral with a circular arc as an end angle, that is, a square-like shape, the cross-sectional area of each layer of square-like step gradually increases in the direction from the orthogonal converter to the horn antenna, and the radius of the circular arc of the square-like ladder gradually increases and gradually approaches a circular shape.

[0009] Specifically, the stepped partition is composed of four layers of steps, the length, the width and the height of the first to fourth layers of steps are 0.19 mm, (0.49±0.01) mm and (0.38±0.01) mm, 0.19 mm, (0.76±0.01) mm and (0.27±0.01) mm, 0.19 mm, (0.52±0.01) mm and (0.13±0.01) mm and 0.19 mm, (0.72±0.01) mm and (0.34±0.01) mm in sequence in the direction from the orthogonal converter to the horn antenna.

[0010] The axial dimension of each layer of step in the multilayer square-like ladder in the application is 0.3±0.03 mm. Preferably, the multilayer square-like ladder is a four-layer square-like ladder, the length and the radius of the circular arc of each layer of square-like step are 2.4±0.02 mm and 0.6 mm, 2.8±0.02 mm and 1.0 mm, 3.2±0.02 mm and 1.2 mm and 3.6±0.02 mm and 1.5 mm in sequence in the direction from the orthogonal converter to the horn antenna, and the diameter of the port of the corner-pyramid horn antenna is 3.84±0.02 mm.

[0011] Further, the orthogonal converter further comprises a first fixing groove, a second fixing groove and a third fixing groove, the first rectangular waveguide is linear, the second rectangular waveguide is right-angled, the first fixing groove, the second fixing groove and the third fixing groove are formed in the side of the orthogonal converter where the first port, the second port and the third port are located, the fixed part corresponds to the third fixing groove, the fixed part is exactly installed in the third fixing groove, and the first port and the second port are WR10 standard waveguide ports.

[0012] Specifically, the first fixing groove, the second fixing groove, the third fixing groove and the fixing portion are circular, square, rectangular, regular hexagonal or regular octagonal in shape.

[0013] That is, the fixing portion, the first fixing groove, the second fixing groove and the third fixing groove are all flange plate structures.

[0014] Further, step chamfers are arranged in the first rectangular waveguide and the second rectangular waveguide.

[0015] Specifically, the quadrature transformer comprises an upper die body and a lower die body, the lower die body comprises a die body main body, a first rectangular waveguide, a second rectangular waveguide, a step partition plate, a first port, a second port and a third port, the first rectangular waveguide and the second rectangular waveguide are arranged on the upper surface of the die body main body, the first rectangular waveguide is linear, starting from the first port on the left side of the die body main body, extending into the die body main body and ending at the third port on the right side of the die body main body, the second rectangular waveguide is right-angled, starting from the second port on the front side of the die body main body, extending into the die body main body, bending and then extending to the third port on the right side of the die body main body, the end of the first rectangular waveguide and the end of the second rectangular waveguide converge to form the third port on the right side of the die body main body, the step partition plate is arranged on the front side of the third port and used for separating the first rectangular waveguide and the second rectangular waveguide, the lower die body is fixed and installed on the upper surface of the die body main body in a planar manner, and the upper part of the first rectangular waveguide and the second rectangular waveguide is closed, the first fixing groove, the second fixing groove and the third fixing groove are arranged on the front side, the left side and the right side of the quadrature transformer respectively with the first port, the second port and the third port as centers.

[0016] Further, the upper die body and the lower die body are further provided with positioning holes and fixing holes, the positioning holes and the fixing holes are arranged through the die body main body, there are at least two positioning holes, the corresponding positioning holes of the upper die body and the lower die body are aligned, and then the upper die body and the lower die body are assembled in alignment, and the upper die body and the lower die body are fixed by bolts passing through the corresponding fixing holes.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] (1) The structure is different, the generation cost is low, the processing is easy, the good rate of finished products is high, and mass production can be realized;

[0019] (2) The antenna has the characteristics of wide bandwidth (90GHz∽130GHz), low reflection loss (the reflection loss is 5dB smaller than that of a traditional antenna) and high energy transmission efficiency (the energy transmission efficiency is improved by more than 30% compared with that of a traditional antenna), and has wide application in the fields of FMCW frequency modulation continuous wave thickness measurement, wideband terahertz radar and 6G terahertz communication. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1The structure diagram of the dual circular polarization terahertz antenna with low loss, high conversion efficiency and high bandwidth.

[0021] Figure 2 The internal structure diagram of the quadrature converter.

[0022] Figure 3 The cross-sectional view of the quadrature converter.

[0023] Figure 4 The structure diagram of the horn antenna. Figure 3 The local enlarged view of the middle stepped partition.

[0024] Figure 5 The cross-sectional view of the horn antenna.

[0025] Figure 6 The local enlarged view of the middle stepped partition. Figure 5 The local enlarged view of the middle stepped partition.

[0026] Figure 7 The size diagram of the stepped square-like multilayer, wherein the left is the front view and the right is the side view.

[0027] Figure 8 The structure diagram of the quadrature converter.

[0028] Figure 9 The structure diagram of the lower mold body.

[0029] Figure 10 The simulation diagram of the terahertz antenna High Frequency Structure Simulator.

[0030] Figure 11 The test diagram of the terahertz antenna Rohde & Schwarz ZVK5000A vector network analyzer.

[0031] Figure 12 The center frequency directional gain diagram.

[0032] Figure 13 The isolation of the left-handed and right-handed gain under the swept frequency.

[0033] 1, the quadrature converter; 2, the horn antenna; 101, the first rectangular waveguide; 102, the second rectangular waveguide; 103, the stepped partition; 104, the first port; 105, the second port; 106, the third port; 107, the first fixed slot; 108, the second fixed slot; 109, the third fixed slot; 110, the positioning hole; 111, the fixed hole; 112, the template body; 113, the stepped chamfer; 201, the corner horn antenna; 202, the fixed part; 203, the stepped square-like multilayer. DETAILED DESCRIPTION

[0034] The application will be further described below by specific embodiments and drawings.

[0035] Embodiment 1

[0036] As Figures 1-7 shown, the low-loss high-conversion-efficiency and high-bandwidth dual-circular-polarization terahertz antenna involved in this embodiment includes an orthogonal converter 1 and a horn antenna 2. The orthogonal converter 1 includes a first rectangular waveguide 101, a second rectangular waveguide 102, a stepped partition (also referred to as a ridge waveguide) 103, a first port 104, a second port 105, and a third port 106. One end of the first rectangular waveguide 101 is the first port 104, one end of the second rectangular waveguide 102 is the second port 105, and the other end of the first rectangular waveguide 101 and the other end of the second rectangular waveguide 102 are combined into the third port 106. The stepped partition 103 is arranged between the first rectangular waveguide 101 and the second rectangular waveguide 102 in front of the third port 106. The horn antenna 2 includes a cornered horn antenna 201, a fixed part 202, and a multilayer square-like stepped part 203 (also referred to as a rectangular waveguide). The horn antenna 2 is fixed on the orthogonal converter 1 through the fixed part 202. A through hole is formed in the fixed part 202. The cornered horn antenna 201 communicates with the third port 106 through the through hole in the fixed part 202. The multilayer square-like stepped part 203 is arranged in the through hole. The multilayer square-like stepped part 203 is composed of at least four steps. The cross section of each step is a quadrilateral with a circular arc as an end angle, i.e., a square-like shape. From the orthogonal converter 1 to the horn antenna 2, the cross-sectional area of each square-like step gradually increases, and the radius of the circular arc of the square-like stepped part gradually increases, gradually approaching a circular shape (the port of the cornered horn antenna).

[0037] Specifically, as Figure 3 and 4As shown, the stepped partition 103 is composed of 4 steps, and the stepped partition 103 gradually reduces in step height along the direction from the quadrature converter 1 to the horn antenna 2, and the length x width x height of the first to fourth steps are 0.19 mm x (0.49±0.01) mm x (0.38±0.01) mm, 0.19 mm x (0.76±0.01) mm x (0.27±0.01) mm, 0.19 mm x (0.52±0.01) mm x (0.13±0.01) mm, 0.19 mm x (0.72±0.01) mm x (0.34±0.01) mm, respectively. The height difference between the first step and the first rectangular waveguide 101 (the template main body 101) is 0.88±0.01. The quadrature mode converter of the application realizes the 90° phase inversion of part of the electromagnetic wave through the specific stepped partition 103, thereby forming two mutually orthogonal linearly polarized waves at the third port 106 to generate a circularly polarized wave. Specifically, the TE10 fundamental mode is transmitted through the waveguide, and when the linearly polarized wave (TE10 fundamental mode) is transmitted to the stepped partition 103, the component perpendicular to the stepped partition 103 introduces a phase delay, thereby realizing 90° inversion and 90° phase delay, converting the TE10 mode into a TE01 mode with the same amplitude and a 90° phase difference, thereby synthesizing a circularly polarized wave TE11.

[0038] In the application, the axial dimension (also referred to as the thickness of each layer) of each layer of the multi-layer square-like step 203 is approximately equal to 1 / 8 of the wavelength of the center frequency, i.e., 0.3±0.03 mm, and the purpose is to realize the smooth, low-loss and efficient conversion of electromagnetic waves from the third port 106 to the pyramid horn antenna 201. Preferably, as shown in Figure 6 and 7 As shown, the multi-layer square-like step 203 is a four-layer square-like step, and the side length and the circular arc of each layer of the square-like step are 2.4±0.02 mm and 0.6 mm, 2.8±0.02 mm and 1.0 mm, 3.2±0.02 mm and 1.2 mm, 3.6±0.02 mm and 1.5 mm, respectively, from the direction of the quadrature converter 1 to the horn antenna 2. The diameter of the pyramid horn antenna port 201 is 3.84±0.02 mm.

[0039] Further, as shown in Figure 8As shown, the quadrature converter 1 further comprises a first fixed slot 107, a second fixed slot 108 and a third fixed slot 109, the first rectangular waveguide 101 is linear, the second rectangular waveguide 102 is right-angled, the first fixed slot 107, the second fixed slot 108 and the third fixed slot 109 are respectively arranged on the side of the quadrature converter 1 where the first port 104, the second port 105 and the third port 106 are located, the fixed part 202 corresponds to the third fixed slot 109, the fixed part 202 is exactly installed and fixed in the third fixed slot 109, thereby realizing the connection of the quadrature converter 1 and the horn antenna 2, the first port 104 and the second port 105 are both WR10 standard waveguide ports, which is convenient for docking with standard parts, for example, the first port 104 is connected with a WR-10 straight waveguide, and the second port 105 is connected with a bent waveguide. Specifically, the first fixed slot 107, the second fixed slot 108, the third fixed slot 109 and the fixed part 202 can be circular, square, rectangular, regular hexagonal or regular octagonal, and preferably circular, that is, the fixed part 202, the first fixed slot 107, the second fixed slot 108 and the third fixed slot 109 are all flange plate structures, and preferably standard flanges.

[0040] Further, as shown in Figure 2 and 3 , a stepped chamfer 113 is arranged in the first rectangular waveguide 101 and the second rectangular waveguide 102, the first port 104 and the second port 105 are converted from WR10 standard waveguide ports to non-standard waveguides through the stepped chamfer 113, the stepped chamfer 113 makes the electromagnetic wave smoothly transition, reduces energy reflection, reduces energy loss and improves the reflection coefficient S11. The first rectangular waveguide 101 and the second rectangular waveguide 102 gradually approach each other through the stepped chamfer, thereby realizing smooth transition in the electromagnetic wave transmission process, so the stepped chamfer must be between the stepped partition plate and the first and second ports.

[0041] Specifically, as shown in Figure 8 and 9 , the quadrature converter 1 comprises an upper die body and a lower die body, the lower die body comprises a die main body 112, the first rectangular waveguide 101, the second rectangular waveguide 102, the stepped partition plate (also known as ridge waveguide) 103, the first port 104, the second port 105 and the third port 106, the die main body 112 is provided with the first rectangular waveguide 101 and the second rectangular waveguide 102 on the upper surface,

[0042] The first rectangular waveguide 101 is straight, starting from the first port 104 on the left side of the template body, extending into the template body to the third port 106 on the right side of the template body, and the second rectangular waveguide 102 is right-angled, starting from the second port 105 on the front side of the template body, extending into the template body, bending and then extending to the third port 106 on the right side of the template body, and the ends of the first rectangular waveguide 101 and the second rectangular waveguide 102 converge to form the third port 106 on the right side of the template body, and the stepped partition plate 103 is arranged in front of the third port 106 to separate the first rectangular waveguide 101 and the second rectangular waveguide 102, and the bottom plane of the lower die body is fixedly installed on the upper surface of the template body 1 to close the upper parts of the first rectangular waveguide 101 and the second rectangular waveguide 102, and the first fixed groove 107, the second fixed groove 108 and the third fixed groove 109 are arranged in the front side, the left side and the right side of the orthogonal converter 1 with the first port 104, the second port 105 and the third port 106 as the centers, respectively.

[0043] Further, the upper die body and the lower die body are also provided with positioning holes 110 and fixing holes 111, and the positioning holes 110 and the fixing holes 111 are arranged through the upper die body and the lower die body, the positioning holes 110 are at least two, and after the corresponding positioning holes 110 of the upper die body and the lower die body are aligned, the upper die body and the lower die body are aligned and assembled, and the bolts pass through the corresponding fixing holes 111 to fix the upper die body and the lower die body. The number of fixing holes 111 is preferably 8, and the fixing holes 111 are symmetrically arranged, which can align and fix the upper and lower die bodies and prevent performance from not meeting the standards (such as too high insertion loss and too low S11) caused by electromagnetic leakage.

[0044] The low-loss high-conversion-efficiency and high-bandwidth dual-circular-polarization terahertz antenna related to the application is simulated by High Frequency Structure Simulator, and the simulation result is shown in Figure 10 , and the S parameter performance test is performed on the antenna by using a Jiujin VNA5000A vector network analyzer, and the result is shown in Figure 11 . Among them, S11 is the reflection coefficient of the first port, and S12 is the isolation degree between the first port and the second port.

Claims

1. A low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna, characterized in that, The quadrature converter comprises a first rectangular waveguide, a second rectangular waveguide, a stepped partition, a first port, a second port and a third port, one end of the first rectangular waveguide is the first port, one end of the second rectangular waveguide is the second port, the other end of the first rectangular waveguide and the other end of the second rectangular waveguide are combined into the third port, the stepped partition is arranged between the first rectangular waveguide and the second rectangular waveguide in front of the third port, the horn antenna comprises a corner horn antenna, a fixed part and a multilayer square-like stepped part, the horn antenna is fixed on the quadrature converter through the fixed part, a through hole is formed in the fixed part, the corner horn antenna communicates with the third port through the through hole in the fixed part, the multilayer square-like stepped part is arranged in the through hole, the multilayer square-like stepped part is composed of at least four steps, the cross section of each step is a quadrilateral with a circular arc as an end angle, that is, a square-like shape, the cross-sectional area of each square-like step gradually increases in the direction from the quadrature converter to the horn antenna, and the radius of the circular arc of the square-like stepped part gradually increases and gradually approaches a circular shape.

2. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, characterized in that, The stepped partition is composed of four steps, and the length, width and height of the first to fourth steps are 0.19 mm x (0.49 ± 0.01) mm x (0.38 ± 0.01) mm, 0.19 mm x (0.76 ± 0.01) mm x (0.27 ± 0.01) mm, 0.19 mm x (0.52 ± 0.01) mm x (0.13 ± 0.01) mm and 0.19 mm x (0.72 ± 0.01) mm x (0.34 ± 0.01) mm in sequence in the direction from the quadrature converter to the horn antenna.

3. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, characterized in that, The axial dimension of each step in the multilayer square-like stepped part is 0.3 ± 0.03 mm.

4. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, characterized in that, The multilayer square-like stepped part is a four-layer square-like stepped part, and the length and the circular arc of each square-like step are 2.4 ± 0.02 mm and 0.6 mm, 2.8 ± 0.02 mm and 1.0 mm, 3.2 ± 0.02 mm and 1.2 mm, and 3.6 ± 0.02 mm and 1.5 mm in sequence in the direction from the quadrature converter to the horn antenna, and the diameter of the port of the corner horn antenna is 3.84 ± 0.02 mm.

5. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, characterized in that, The quadrature converter further comprises a first fixing groove, a second fixing groove and a third fixing groove, the first rectangular waveguide is linear, the second rectangular waveguide is right-angled, the first fixing groove, the second fixing groove and the third fixing groove are respectively formed on the side of the quadrature converter where the first port, the second port and the third port are located, the fixed part corresponds to the third fixing groove, the fixed part is exactly installed in the third fixing groove, and the first port and the second port are WR10 standard waveguide ports.

6. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 5, characterized in that, The first fixing groove, the second fixing groove, the third fixing groove and the fixed part are circular, square, rectangular, regular hexagonal or regular octagonal in shape.

7. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, wherein, Stepped chamfers are arranged in the first rectangular waveguide and the second rectangular waveguide.

8. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 1, wherein, The orthogonal transducer includes an upper mold body and a lower mold body. The lower mold body includes a template body, a first rectangular waveguide, a second rectangular waveguide, a stepped partition, a first port, a second port, and a third port. The first rectangular waveguide and the second rectangular waveguide are formed on the upper surface of the template body. The first rectangular waveguide is straight and starts from the first port on the left side of the template body, extends into the template body, and ends at the third port on the right side of the template body. The second rectangular waveguide is right-angled and starts from the second port on the front side of the template body, extends into the template body, bends, and then extends to the third port on the right side of the template body. The ends of the first and second rectangular waveguides converge on the right side of the template body to form the third port. A stepped partition is set on the front side of the third port to separate the first and second rectangular waveguides. The bottom plane of the lower mold body is mounted and fixed on the upper surface of the template body, closing the upper part of the first and second rectangular waveguides. A first fixing groove, a second fixing groove, and a third fixing groove are set on the front, left, and right sides of the orthogonal transducer, respectively, with the first port, the second port, and the third port as the center.

9. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 8, wherein, Both the upper and lower mold bodies are provided with positioning holes and fixing holes. Positioning holes and fixing holes are opened through the main body of the template. There are at least two positioning holes. After the corresponding positioning holes of the upper and lower mold bodies are aligned, the upper and lower mold bodies are aligned and assembled. Bolts pass through the corresponding fixing holes to fix the upper and lower mold bodies.

10. The low-loss high-conversion-efficiency and high-bandwidth dual-circularly-polarized terahertz antenna according to claim 8, wherein, Its bandwidth is 90GHz to 130GHz.

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