A waveguide structure linear polarization complementary source antenna based on 3D printing technology

Abstract

The present invention discloses a waveguide structure linear polarization complementary source antenna based on 3D printing technology. The antenna comprises a rectangular dielectric block, two rectangular dielectric sheets, a TE 10 mode rectangular open waveguide, E-plane T-junction waveguide power divider and two coaxial connectors; among them, the rectangular dielectric block is located at the top of the antenna and is connected to the TE 10 mode rectangular open waveguide connected; TE 10 The E-plane T-junction waveguide power divider is connected below the rectangular open waveguide; the structural parameters of the two rectangular dielectric sheets are exactly the same, fitting the TE 10 The wide side of the rectangular open waveguide cross section of the mode is symmetrically placed at the opening connected to the rectangular dielectric block, and the TE 10 The mode rectangular open waveguide is connected; the E-plane T-junction waveguide power divider is connected to two coaxial connectors below. The present invention effectively solves the performance sensitivity problem caused by errors in the later processing of traditional microwave frequency band complementary source antennas, and has the advantages of simple structure, easy processing, rapid prototyping and light weight.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a waveguide structure linear polarization complementary source antenna based on 3D printing technology. Background Art

[0002] 3D printing technology is a rapid prototyping technology that achieves the purpose of building structures by orderly stacking, depositing, extruding, and sintering raw materials. Different from the traditional CNC process that uses subtractive means to process objects, 3D printing uses additive methods to build the required structure, which can largely avoid the waste of raw materials. Through three-dimensional model files, 3D printing technology can be competent for the processing of various complex and special-shaped structures, and at the same time has a very short processing cycle, which can greatly save manpower and material resources. At present, 3D printing technology has been applied to the field of antennas to a certain extent, such as: transmission arrays and prism designs using dielectric materials, and horn antennas and microstrip antennas printed using 3D metal materials. Some of these products have been successfully commercialized. It can be seen that 3D printing technology has emerged in the field of antennas and has strong advantages. Antenna design based on this new processing technology will become an important development direction for future academic research and commercial applications.

[0003] In recent years, complementary source antennas have received widespread attention in both academic and commercial fields. Its working principle is to use a pair of orthogonally placed magnetic and electric dipole antennas that are complementary sources to each other, so as to achieve unidirectional radiation characteristics with low backlobes. This type of antenna usually has the advantages of broadband, high gain, stable radiation pattern, low backlobes, and low cross-polarization. In the microwave frequency band, traditional complementary source antennas are mostly open structures. Usually, two pairs of metal patches are placed vertically and horizontally respectively. When working, these two pairs of metal patches play the role of magnetic and electric dipoles respectively. At the bottom of the antenna, a ground plate or a metal cavity is usually connected as a reflector. The feeding circuit is generally a single-ended L-shaped, Γ-shaped probe or a differential microstrip line.

[0004] Traditional microwave frequency complementary source antennas are relatively complex in structure and are usually assembled from multiple components. In addition to the PCB process, some post-processing is also required, such as component assembly and welding. These post-processing are usually done manually, which is time-consuming and labor-intensive and prone to inevitable errors. Traditional complementary source antennas are very sensitive to these processing errors, and even small errors may have a significant impact on antenna performance.

[0005] In addition, most traditional microwave frequency complementary source antennas have a certain weight, which is caused by the introduction of some pure metal structures in the antenna structure, such as the magnetic and electric dipoles themselves, the metal back cavity (MJ Li and KM Luk, "A differential-fed magneto-electric dipole antenna for UWB applications," IEEE Trans. Antennas Propag., vol. 61, no. 1, pp. 92–99, Jan. 2013.), and the reflector (HW Lai, KK So, H. Wong, CH Chan, and KM Luk, "Magnetoelectric dipole antennas with dual open-ended slot excitation," IEEE Trans. Antennas Propag., vol. 64, no. 8, pp. 3338–3346, Aug. 2016. MJ Li and KM Luk, "A wideband circularly polarized antenna for microwave and millimeter-wave applications," IEEE Trans. Antennas Propag., vol.62, no.4, pp.1872–1879, Apr.2014. BQWu and KMLuk, “A broadband dual-polarized magneto-electric dipole antenna with simple feeds,” IEEE Antennas Wireless Propag. Lett., vol.8, pp.60–63, 2009.) etc. From a system-level perspective, excessive antenna weight may increase the difficulty of integrating the antenna with the communication front-end circuit, which will have an adverse impact on practical applications.

[0006] Current 3D printed antennas can be roughly divided into two categories: dielectric materials and metal materials. The former is mostly used in reflectarrays (BJChen, H.Yi, KBNg, SWQu, and CHChan, "3D printed reflectarrayantenna at 60GHz," Proceeding of ISAP 2016, Nov. 24–28, 2016, Okinawa, Japan, pp. 92–93.), prisms (H.Yi, SWQu, KBNg, CHChan, and X.Bai, "3-D printed reflectarrayantenna at 60GHz," millimeter-waveand terahertz lenses with fixed and frequency scanned beam," IEEETrans.Antennas Propag., vol.64, no.2, pp.442–449, Feb.2016.) or dielectric rod (J.Huang, SJChen, Z.Xue, W.Withayachumnankul, and C.Fumeaux, "Wideband circularlypolarized 3-D printed dielectric rod antenna," IEEE Trans.Antennas Propag., vol.68, no.2, pp.745–753, Feb.2020.) type antennas, and there are few reports on waveguide type antennas.Although the latter has proposed waveguide-type antenna designs, most of them are hollow waveguide structures filled with air (B. Zhang, Z. Zhan, Y. Cao, H. Gulan, P. Linner, J. Sun, T. Zwick, and H. Zirath, "Metallic 3D printed antennas for millimeter-and submillimeter-wave applications," IEEE Trans. THz Sci. Technol., vol. 6, no. 4, pp. 592-600, Jul. 2016. B. Zhang, H. Sun, L. Wu, Y. Zhou, Y. Yang, H. Zhu, F. Cheng, Y. He, and K. Huang, "A metallic 3-D printed airborne high-power handling magneto-electric dipole array with cooling channels," IEEE Trans. Antennas Propag., vol. 67, no. 12, pp. 7368–7378, Dec. 2019.), this type of structure may have insufficient mechanical properties and be prone to deformation, and because it is made of metal, it is often heavy. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of complex structure of traditional microwave frequency band complementary source antennas, the problem of sensitivity of performance of traditional microwave frequency band complementary source antennas to processing errors due to post-processing, the problem of heavy weight of traditional microwave frequency band complementary source antennas due to the involvement of metal structures, and the problem of insufficient mechanical properties and easy deformation of 3D printed metal waveguide structures.

[0008] The purpose of the present invention is achieved by at least one of the following technical solutions.

[0009] A waveguide structure linear polarization complementary source antenna based on 3D printing technology, comprising a rectangular dielectric block, two rectangular dielectric sheets, a TE 10 mode rectangular open waveguide, E-plane T-junction waveguide power divider and two coaxial connectors;

[0010] The rectangular dielectric block is located at the top of the antenna and is 10 mode rectangular open waveguide connected; TE 10 The E-plane T-junction waveguide power divider is connected below the rectangular open waveguide; the structural parameters of the two rectangular dielectric sheets are exactly the same, fitting the TE 10The wide side of the rectangular open waveguide cross section of the mode is symmetrically placed at the opening connected to the rectangular dielectric block, and the TE 10 The mode rectangular open waveguide is connected; the lower part of the E-plane T-junction waveguide power divider is connected to two coaxial connectors.

[0011] Furthermore, in the waveguide structure linear polarization complementary source antenna, except for the top surface and four side surfaces of the rectangular dielectric block, and the annular cross-section between the inner and outer conductors connecting the E-plane T-junction waveguide power divider and the two coaxial connectors, all other surfaces are covered with a thin metal layer, and the metal copper is covered by electroplating.

[0012] Furthermore, during processing, the waveguide structure linear polarization complementary source antenna is divided into two parts for 3D printing, namely, the top rectangular dielectric block and the remaining antenna structure; after the 3D printing is completed, a first mask is set at the joint of the rectangular dielectric block and the remaining antenna structure;

[0013] Two first positioning holes are arranged at the bottom of the rectangular dielectric block, which are respectively a first first positioning hole arranged at the bottom of the front half of the rectangular dielectric block and a second first positioning hole arranged at the bottom of the rear half of the rectangular dielectric block;

[0014] A second positioning hole is arranged in the first mask at a position corresponding to the first positioning hole, the first second positioning hole corresponds to the first first positioning hole, and the second second positioning hole corresponds to the second first positioning hole;

[0015] In the remaining antenna structure, TE 10 Two positioning posts are arranged at the top opening of the rectangular opening waveguide, wherein the first positioning post corresponds to the first first positioning hole and the first second positioning hole and can be perfectly joined, and the second positioning post corresponds to the second first positioning hole and the second second positioning hole and can be perfectly joined

[0016] In the remaining antenna structure, two probe holes are arranged on the geometric midline along the wide side of the bottom of the E-plane T-junction waveguide power divider, and the first probe hole and the second probe hole are symmetrically arranged at a quarter of the guided wavelength from the end of the waveguide;

[0017] A second mask is arranged at two probe holes of the E-plane T-junction waveguide power divider, including a first second mask arranged at the first probe hole and a second second mask arranged at the second probe hole.

[0018] Furthermore, after the mask is completed, the remaining antenna structure needs to be electroplated, and the rectangular dielectric block does not need to be electroplated. Finally, the antenna is assembled, and the rectangular dielectric block and the remaining antenna structure and the two coaxial connectors are bonded with ethyl cyanoacrylate glue. During the assembly process, the first positioning hole corresponds to the positioning column and can be perfectly engaged; the coaxial connector corresponds to the probe hole and can be perfectly engaged.

[0019] Furthermore, the first positioning post corresponds to the first and second positioning holes and can be perfectly engaged, and the second positioning post corresponds to the second and second positioning holes and can be perfectly engaged, so as to avoid electroplating;

[0020] The first second mask and the second second mask should be joined with the first probe hole and the second probe hole to avoid electroplating of the probe hole and the coaxial line cross section;

[0021] The first mask is a rectangular structure with a cross-sectional size similar to TE 10 The openings of the mode rectangular open waveguides are of the same size and have an arbitrary height; the second mask includes a small cylinder of the same size as the probe hole and a large cylinder of the same size as the cross-section of the coaxial connector and an arbitrary height, and the small cylinder is connected to the large cylinder.

[0022] Furthermore, the complementary source of the waveguide structure linear polarization complementary source antenna is realized by a pair of magnetic and electric dipoles; wherein the magnetic dipole is realized by TE 10 The mode is realized by rectangular open waveguide, and the electric dipole is arranged in TE 10 The mode is realized by rectangular dielectric sheets covered with metal thin layers on both sides of the rectangular open waveguide;

[0023] The magnetic and electric dipoles are placed orthogonally. When the antenna is working, the electromagnetic waves generated by the magnetic and electric dipoles in the radiation direction of the antenna are superimposed on each other, enhancing the radiation in this direction; in the direction of the back lobe of the antenna pattern, the electromagnetic waves generated by the magnetic and electric dipoles cancel each other out, reducing the backward radiation of the antenna; the function of the rectangular dielectric block on the top is to achieve impedance matching of the antenna; the E-plane T-junction waveguide power divider at the bottom has a natural differential characteristic and is used as a differential feeding network.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] Compared with the prior art, the present invention combines 3D printing technology with complementary source antenna technology, which can effectively solve the performance sensitivity problem caused by errors in the later processing of traditional microwave frequency band complementary source antennas, and has the advantages of simple structure, easy processing, rapid prototyping, and light weight. In terms of antenna performance, the present invention has the advantages of broadband (relative bandwidth 46.8%, 7.2-11.6GHz), stable gain (5.4±1.2dBi in band), stable directional pattern, low back lobe (directional pattern front-to-back ratio greater than 22dB), and low cross-polarization. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0027] Figure 2It is a front view of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0028] Figure 3 A side view of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0029] Figure 4 It is a front view of a linear polarization complementary source antenna of a waveguide structure during an electroplating process in an embodiment of the present invention;

[0030] Figure 5 A side view of a linearly polarized complementary source antenna of a waveguide structure during an electroplating process in an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of impedance matching characteristics of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0032] Figure 7a The center frequency E-plane radiation pattern of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0033] Figure 7b The center frequency H-plane radiation pattern of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention;

[0034] Figure 8 Schematic diagram of gain characteristics of a waveguide structure linear polarization complementary source antenna based on 3D printing technology in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the specific implementation of the present invention is described in detail below with reference to the accompanying drawings and examples.

[0036] Example:

[0037] A waveguide structure linear polarization complementary source antenna based on 3D printing technology, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a rectangular dielectric block 21, two rectangular dielectric sheets 22, TE 10 mode rectangular open waveguide 23, E-plane T-junction waveguide power divider 24 and two coaxial connectors 25;

[0038] The rectangular dielectric block 21 is located at the top of the antenna and is 10 mode rectangular open waveguide 23 connected; TE 10 The lower part of the rectangular open waveguide 23 is connected to the E-plane T-junction waveguide power divider 24; the two rectangular dielectric sheets 22 have the same structural parameters and fit the TE10 The wide side of the cross section of the rectangular open waveguide 23 is symmetrically placed at the opening connected to the rectangular dielectric block 21, and is connected to the TE 10 The E-plane T-junction waveguide power divider 24 is connected to two coaxial connectors 25 at the bottom.

[0039] In the waveguide structure linear polarization complementary source antenna, except for the top surface and four side surfaces of the rectangular dielectric block 21, and the annular cross-section between the inner and outer conductors connecting the E-plane T-junction waveguide power divider 24 and the two coaxial connectors 25, all other surfaces are covered with a thin metal layer, which is covered with metal copper by electroplating.

[0040] like Figure 4 , Figure 5 As shown, during the processing of the waveguide structure linear polarization complementary source antenna, two parts are 3D printed separately, namely the top rectangular dielectric block 21 and the remaining antenna structure 33; after the 3D printing is completed, a first mask 34 is set at the joint of the rectangular dielectric block 21 and the remaining antenna structure 33;

[0041] Two first positioning holes 36 are provided at the bottom of the rectangular dielectric block 21, namely a first first positioning hole 361 provided at the bottom of the front half of the rectangular dielectric block 21 and a second first positioning hole 362 provided at the bottom of the rear half of the rectangular dielectric block 21;

[0042] The first mask 34 is provided with a second positioning hole 37 corresponding to the first positioning hole 36 , the first second positioning hole 372 corresponds to the first first positioning hole 361 , and the second second positioning hole 371 corresponds to the second first positioning hole 362 ;

[0043] In the remaining antenna structure 33, TE 10 Two positioning posts 38 are provided at the top opening of the mode rectangular opening waveguide 23, wherein the first positioning post 381 corresponds to the first first positioning hole 361 and the first second positioning hole 372 and can be perfectly engaged, and the second positioning post 382 corresponds to the second first positioning hole 362 and the second second positioning hole 371 and can be perfectly engaged;

[0044] In the remaining antenna structure 33, two probe holes 39 are arranged on the geometric midline along the wide side of the bottom of the E-plane T-junction waveguide power divider 24, and the first probe hole 391 and the second probe hole 392 are symmetrically arranged at a distance of one quarter of the guide wavelength from the end of the waveguide;

[0045] The second mask 35 is disposed at the two probe holes 39 of the E-plane T-junction waveguide power divider 24 , including a first second mask 351 disposed at the first probe hole 391 and a second second mask 352 disposed at the second probe hole 392 .

[0046] like Figure 4 , Figure 5 As shown, after the mask is completed, the remaining antenna structure 33 needs to be electroplated, and the rectangular dielectric block 21 does not need to be electroplated. Finally, the antenna is assembled, and the rectangular dielectric block 21 and the remaining antenna structure 33 and the two coaxial connectors 25 are bonded with ethyl cyanoacrylate glue. During the assembly process, the first positioning hole 36 corresponds to the positioning column 38 and can be perfectly engaged; the coaxial connector 25 corresponds to the probe hole 39 and can be perfectly engaged.

[0047] like Figure 4 , Figure 5 As shown, the first positioning post 381 corresponds to the first second positioning hole 372 and can be perfectly engaged, and the second positioning post 382 corresponds to the second second positioning hole 371 and can be perfectly engaged, so as to avoid electroplating of the connecting section of the rectangular dielectric block 21 and the remaining antenna structure 33;

[0048] The first second mask 351 and the second second mask 352 should be joined with the first probe hole 391 and the second probe hole 392 to prevent the probe hole 39 and the coaxial line cross section from being electroplated;

[0049] The first mask 34 is a rectangular structure with a cross-sectional size similar to TE 10 The openings of the mode rectangular open waveguides 23 are of the same size and have an arbitrary height; the second mask 35 includes a small cylinder of the same size as the probe hole 39 and a large cylinder of the same cross-sectional size as the coaxial connector 25 and an arbitrary height, and the small cylinder is connected to the large cylinder.

[0050] The complementary source of the waveguide structure linear polarization complementary source antenna is realized by a pair of magnetic and electric dipoles; the magnetic dipole is realized by TE 10 The mode is realized by rectangular open waveguide 23, and the electric dipole is arranged in TE 10 The mode is realized by rectangular dielectric sheets 22 covered with metal thin layers on both sides of rectangular open waveguide 23;

[0051] The magnetic and electric dipoles are placed orthogonally. When the antenna is working, the electromagnetic waves generated by the magnetic and electric dipoles in the radiation direction of the antenna are superimposed on each other, thereby enhancing the radiation in this direction. In the direction of the back lobe of the antenna radiation pattern, the electromagnetic waves generated by the magnetic and electric dipoles cancel each other out, thereby reducing the backward radiation of the antenna. The function of the rectangular dielectric block 21 at the top is to achieve impedance matching of the antenna. The E-plane T-junction waveguide power divider 24 at the lower end has a natural differential characteristic and is used as a differential feeding network.

[0052] In this embodiment, the present invention can achieve a wider working bandwidth, such as Figure 6 As shown, the working frequency band of the antenna is 7.2 GHz to 11.6 GHz, about 46.8%, and the in-band |S dd11| are all less than -10dB. Within the operating frequency band, the antenna has a stable low backlobe unidirectional radiation pattern, such as Figure 7a and Figure 7b As shown, the front-to-back ratio of the directivity pattern is greater than 22dB. Figure 8 The antenna gain characteristic is shown. The antenna gain is stable within the working frequency band, with an average gain of 5.4dBi and a fluctuation range of ±1.2dBi. These antenna parameters show that the solution of the present invention not only solves the problems of the prior art but also inherits the excellent electrical performance of the traditional complementary source antenna.

Claims

1. A waveguide structure linear polarization complementary source antenna based on 3D printing technology, characterized in that: It comprises a rectangular dielectric block (21), two rectangular dielectric sheets (22), a TE 10 mode rectangular open waveguide (23), an E-plane T-junction waveguide power divider (24) and two coaxial connectors (25); The rectangular dielectric block (21) is located at the top of the antenna and is connected to the TE 10 mode rectangular open waveguide (23); TE 10 The lower part of the rectangular open waveguide (23) is connected to an E-plane T-junction waveguide power divider (24); the structural parameters of the two rectangular dielectric sheets (22) are exactly the same, and they fit the TE 10 The wide side of the cross section of the rectangular open waveguide (23) is symmetrically placed at the opening connected to the rectangular dielectric block (21) and is connected to the TE 10 The E-plane T-junction waveguide power divider (24) is connected to two coaxial connectors (25) at the bottom; The complementary source of the waveguide structure linear polarization complementary source antenna is realized by a pair of magnetic and electric dipoles; the magnetic dipole is realized by TE 10 The mode is realized by a rectangular open waveguide (23), and the electric dipole is arranged in TE 10 The mode is realized by rectangular dielectric sheets (22) covered with a metal thin layer on both sides of a rectangular open waveguide (23); the magnetic and electric dipoles are placed orthogonally, and when the antenna is working, the electromagnetic waves generated by the magnetic and electric dipoles in the radiation direction of the antenna are superimposed on each other, thereby enhancing the radiation in this direction; in the direction of the rear lobe of the antenna pattern, the electromagnetic waves generated by the magnetic and electric dipoles cancel each other out, thereby reducing the backward radiation of the antenna; the rectangular dielectric block (21) at the top functions to achieve impedance matching of the antenna; and the E-plane T-junction waveguide power divider (24) at the lower end has a natural differential characteristic and is used as a differential feeding network.

2. According to the 3D printing technology-based waveguide structure linear polarization complementary source antenna according to claim 1, it is characterized in that: In the waveguide structure linear polarization complementary source antenna, except for the top surface and four side surfaces of the rectangular dielectric block (21), and the annular cross section between the inner and outer conductors connected to the E-plane T-junction waveguide power divider (24) and two coaxial connectors (25), all other surfaces are covered with a metal thin layer, and the metal copper is covered by electroplating.

3. According to the 3D printing technology-based waveguide structure linear polarization complementary source antenna according to claim 2, it is characterized in that: During processing, the waveguide structure linear polarization complementary source antenna is divided into two parts for 3D printing, namely, a rectangular dielectric block (21) at the top and a remaining antenna structure (33); after the 3D printing is completed, a first mask (34) is set at the joint between the rectangular dielectric block (21) and the remaining antenna structure (33); Two first positioning holes (36) are arranged at the bottom of the rectangular dielectric block (21), namely a first first positioning hole (361) arranged at the bottom of the front half of the rectangular dielectric block (21) and a second first positioning hole (362) arranged at the bottom of the rear half of the rectangular dielectric block (21); A second positioning hole (37) is arranged in the first mask (34) at a position corresponding to the first positioning hole (36), the first second positioning hole (372) corresponds to the first first positioning hole (361), and the second second positioning hole (371) corresponds to the second first positioning hole (362); In the remaining antenna structure (33), TE 10 Two positioning posts (38) are arranged at the top opening of the mode rectangular open waveguide (23), wherein the first positioning post (381) corresponds to the first first positioning hole (361) and the first second positioning hole (372) and can be perfectly joined, and the second positioning post (382) corresponds to the second first positioning hole (362) and the second second positioning hole (371) and can be perfectly joined; In the remaining antenna structure (33), two probe holes (39) are arranged on the geometric midline of the bottom of the E-plane T-junction waveguide power divider (24) along the wide side, and the first probe hole (391) and the second probe hole (392) are symmetrically arranged at a distance of one quarter of the guide wavelength from the end of the waveguide; A second mask (35) is arranged at two probe holes (39) of an E-plane T-junction waveguide power divider (24), comprising a first second mask (351) arranged at the first probe hole (391) and a second second mask (352) arranged at the second probe hole (392).

4. According to the 3D printing technology-based waveguide structure linear polarization complementary source antenna according to claim 3, it is characterized in that: After the mask is completed, the remaining antenna structure (33) needs to be electroplated, and the rectangular dielectric block (21) does not need to be electroplated. Finally, the antenna is assembled, and the rectangular dielectric block (21) and the remaining antenna structure (33) are bonded together with two coaxial connectors (25) using ethyl cyanoacrylate glue. During the assembly process, the first positioning hole (36) corresponds to the positioning column (38) and can be perfectly joined; the coaxial connector (25) corresponds to the probe hole (39) and can be perfectly joined.

5. The waveguide structure linear polarization complementary source antenna based on 3D printing technology according to claim 4, characterized in that: The first positioning post (381) corresponds to the first second positioning hole (372) and can be perfectly joined, and the second positioning post (382) corresponds to the second second positioning hole (371) and can be perfectly joined, so as to avoid electroplating of the connection section between the rectangular dielectric block (21) and the remaining antenna structure (33); The first second mask (351) and the second second mask (352) should be joined with the first probe hole (391) and the second probe hole (392) to prevent the probe hole (39) and the coaxial line cross section from being electroplated; The first mask (34) is a rectangular structure with a cross-sectional size similar to TE 10 The openings of the mode rectangular opening waveguides (23) are of the same size and have an arbitrary height; the second mask (35) comprises a small cylinder of the same size as the probe hole (39) and a large cylinder of the same cross-sectional size as the coaxial connector (25) and an arbitrary height, and the small cylinder is connected to the large cylinder.

6. A waveguide structure linear polarization complementary source antenna based on 3D printing technology according to any one of claims 1 to 5, characterized in that: The complementary source of the waveguide structure linear polarization complementary source antenna is realized by a pair of magnetic and electric dipoles; the magnetic dipole is realized by TE 10 The mode is realized by a rectangular open waveguide (23), and the electric dipole is arranged in TE 10 The mode is realized by rectangular dielectric sheets (22) covered with metal thin layers on both sides of the rectangular open waveguide (23); The magnetic and electric dipoles are placed orthogonally. When the antenna is working, the electromagnetic waves generated by the magnetic and electric dipoles in the radiation direction of the antenna are superimposed on each other, thereby enhancing the radiation in this direction. In the direction of the rear lobe of the antenna pattern, the electromagnetic waves generated by the magnetic and electric dipoles cancel each other out, thereby reducing the backward radiation of the antenna. The rectangular dielectric block (21) at the top is used to achieve impedance matching of the antenna. The E-plane T-junction waveguide power divider (24) at the bottom has a natural differential characteristic and is used as a differential feeding network.

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