Waveguide antenna testing device and waveguide antenna testing combination device
By designing a waveguide antenna test device, and aligning the transmission holes of the connectors and test structure with the radiation slots of the waveguide antenna, the problem of the difficulty in matching the waveguide antenna test piece with the waveguide antenna was solved, thus achieving efficient and accurate performance evaluation and reliable test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MILLIMETER AUTOMOTIVE TECHNOLOGY CO LTD
- Filing Date
- 2025-03-07
- Publication Date
- 2026-04-10
AI Technical Summary
The existing waveguide antenna test piece is difficult to fit with the waveguide antenna, especially due to the small chip size and the dense conductive bumps in the transition structure, which leads to low processing yield.
Design a waveguide antenna testing device, including a connector and a test structure. The connector has a transmission hole that is aligned with the radiation slot of the waveguide antenna. The test structure transmits and receives electromagnetic signals. The transmission hole reduces the difficulty of fitting, and the matching section precisely connects with the radiation slot to ensure that the signal transmission has no obvious reflection.
It enables efficient and accurate performance evaluation of waveguide antennas, improves testing efficiency and data reliability, reduces the difficulty of matching test components with waveguide antennas, and improves processing yield.
Smart Images
Figure CN224109637U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to waveguide antenna technical field especially relates to a waveguide antenna testing device and waveguide antenna testing combination device. BACKGROUND
[0002] The new generation millimeter wave radar antenna mostly adopts waveguide structure as the main body to design, and the waveguide antenna includes a waveguide main body and an adapter structure, the waveguide main body is provided with a transmission slot for transmitting signals, and the adapter structure is arranged on one side of the waveguide main body and is electrically connected with the chip on the PCBA board, wherein the adapter structure is often designed with a metal wall + choke groove, that is, a plurality of conductive protrusions are arranged on one side of the waveguide main body. At present, the test of the millimeter wave antenna is to replace the PCBA board with a waveguide antenna test piece, so that the waveguide antenna test piece is connected with the waveguide main body through the conductive protrusions, the waveguide antenna test piece injects signals into the waveguide main body, and the waveguide antenna test piece monitors the energy size of the reflected signals, so as to obtain the voltage standing wave ratio or S11 of the waveguide antenna, that is, whether the waveguide antenna is matched with the air is detected, if the amplitude of the reflected signal is at least one order of magnitude lower than that of the incident signal, it is considered that the waveguide antenna is normal, otherwise it is not normal.
[0003] The shape of the connecting surface of the waveguide antenna test piece needs to be adapted to the adapter structure, and since the size of the chip is small, and the adapter structure has dozens of corresponding conductive protrusions, the arrangement of the plurality of conductive protrusions is dense, and the matching difficulty is extremely high, which reduces the processing yield.
[0004] Therefore, how to reduce the matching difficulty of the test piece and the waveguide antenna is a problem to be solved by the person skilled in the art. INVENTION CONTENTS
[0005] The main purpose of the utility model is to provide a waveguide antenna testing device, which aims at how to reduce the matching difficulty of the test piece and the waveguide antenna.
[0006] In order to achieve the above purpose, the waveguide antenna testing device provided by the utility model is used to detect an open waveguide antenna, and the waveguide antenna testing device includes a connecting piece and a test structure, two opposite sides of the connecting piece form a mounting surface and a test surface, the mounting surface is used to be attached to the open end of the open waveguide antenna, and a transmission hole penetrating through the test surface and the mounting surface is arranged on the connecting piece and is used to be aligned with at least one radiation slot of the open waveguide antenna, the test structure is arranged on the test surface and is electrically connected with the connecting piece, emits electromagnetic signals towards the transmission hole and receives reflected signals.
[0007] In an embodiment, the transmission hole comprises a test section, a transition section and a matching section connected in sequence; the test section is used to correspond to the test structure; the transition section is communicated with the test section, and the cross-sectional area of at least one section is arranged in a changing manner; the matching section is communicated with the transition section, and the shape of the matching section is used to match the slot of the radiation slot and is used to communicate with the radiation slot.
[0008] In an embodiment, the transition section is consistent with the shape of the radiation slot, and the cross-sectional area of the transition section changes in a direction away from the test section, and the changing trend of the cross-sectional area of the transition section is used to be opposite to the changing trend of the cross-sectional area of the radiation slot.
[0009] In an embodiment, the open waveguide antenna has a plurality of radiation slots; the test section, the transition section and the matching section jointly form a transmission unit; the transmission hole has a containing section and a plurality of transmission units communicated with the containing section; the connecting piece further comprises a power divider arranged in the containing section, and the power divider has an input port and a plurality of output ports; the input port is electrically connected with the test structure, and the plurality of output ports are respectively embedded in the plurality of test sections.
[0010] In an embodiment, the plurality of matching sections in the plurality of transmission units are arranged in communication with each other.
[0011] In an embodiment, the plurality of matching sections are arranged in communication with each other to jointly form a matching cavity, and the matching cavity is filled with a dielectric material; the dielectric constant of the dielectric material is ε, and 2≤ε≤5.
[0012] In an embodiment, the test surface is coated with a surface coating material to reduce the surface roughness of the test surface.
[0013] In an embodiment, the test structure comprises a measurement module and a calibration module; the measurement module is electrically connected with the connecting piece, emits an electromagnetic signal and receives a reflected signal, and the measurement module comprises at least one of a vector network analyzer, a spectrum analyzer or a time domain reflectometer; the calibration module is electrically connected with the measurement module and is used to eliminate the measurement error of the measurement module.
[0014] The utility model also proposes a kind of waveguide antenna test combination device, including open waveguide antenna and waveguide antenna test device for testing the open waveguide antenna;The edge of open waveguide antenna is provided with a plurality of clamping grooves;Waveguide antenna test device is used to detect open waveguide antenna, and waveguide antenna test device includes connecting piece and test structure;Two opposite sides of connecting piece form mounting surface and test surface, and mounting surface is used to be consistent with the opening end of open waveguide antenna, and transmission hole is provided on connecting piece and passes through test surface and mounting surface, to be aligned with at least one radiation slot of open waveguide antenna;Test structure is arranged on test surface, and is electrically connected with connecting piece, and electromagnetic signal is emitted towards transmission hole and reflected signal is received;The edge of connecting piece is provided with a plurality of buckles, and the plurality of buckles are matched with the plurality of clamping grooves, to make transmission hole and radiation slot align.
[0015] In an embodiment, the material of the waveguide antenna test combination device comprises a conductive material; or, the material of the waveguide antenna test combination device comprises a non-conductive material, and the inner wall of the transmission hole is plated with a conductive coating material.
[0016] The technical scheme of the utility model discloses the connecting piece is arranged at the open end of the open waveguide antenna, and the transmission hole that is aligned with the radiation slot of the open waveguide antenna is arranged in the connecting piece, and the radiation slot of the open waveguide antenna is less and sparse than the conductive protrusion, so the matching difficulty of the test piece and the waveguide antenna is reduced, when testing, the test structure emits electromagnetic signals to the transmission hole and receives reflected signals, so as to obtain the voltage standing wave ratio or S11 of the open waveguide antenna, and the radiation slot of the open waveguide antenna itself is matched with the impedance of free space, the electromagnetic signal emitted by the test structure to the transmission hole reaches the free space through the radiation slot, and there is no obvious reflected signal, and the antenna has reciprocity, and the difference of transmission path does not affect the accuracy of test result, so that efficient and accurate waveguide antenna performance evaluation is realized, and the test efficiency and data reliability are improved. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in the drawings without creating labor.
[0018] Figure 1 The structural schematic diagram of an embodiment of the waveguide antenna test combination device provided by the utility model is shown in the figure.
[0019] Figure 2 The matching structure schematic diagram of the waveguide antenna and the PCBA board in the related art is shown in the figure.
[0020] Figure 3 The detection structure schematic diagram of the waveguide antenna in the related art is shown in the figure.
[0021] Figure 4 The sectional structure schematic diagram of the waveguide antenna test combination device in embodiment 1 is shown in the figure.
[0022] Figure 5 The sectional structure schematic diagram of the waveguide antenna test combination device in embodiment 2 is shown in the figure.
[0023] Figure 6 The sectional structure schematic diagram of the waveguide antenna test combination device in embodiment 3 is shown in the figure.
[0024] Figure 7Voltage standing wave ratio diagram for example 2;
[0025] Figure 8 Voltage standing wave ratio diagram for example 3.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 100, waveguide antenna testing device; 1, connecting piece; 1A, mounting surface; 1B, testing surface; 11, transmission hole; 111, testing section; 112, transition section; 113, matching section; 114, containing section; 2, testing structure;
[0028] 200, open waveguide antenna; 201, waveguide main body; 202, radiation slot; 203, feed line; 204, conductive protrusion;
[0029] 300, PCBA board; 301, chip.
[0030] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION
[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0032] It should be noted that if the embodiments of the utility model 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 condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0033] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.
[0034] Please refer to Figures 2 to 3 The waveguide antenna includes a waveguide body 201 and an adapter structure, the transmission slot for transmitting signals is arranged on the waveguide body 201, and the adapter structure is arranged on one side of the waveguide body 201 and is electrically connected with the chip 301 on the PCBA board. Wherein, the adapter structure often adopts metal wall + choke groove design, that is, a plurality of conductive protrusions 204 are arranged on one side of the waveguide body 201. At present, the test of the millimeter wave antenna is to replace the PCBA with the waveguide antenna test piece, so that the waveguide antenna test piece is connected with the waveguide body 201 through the conductive protrusion 204, the waveguide antenna test piece injects signals into the waveguide body 201 through the conductive protrusion 204 (the same as the signal emission path of the waveguide antenna), and the waveguide antenna test piece monitors the energy size of the reflected signal, so as to obtain the voltage standing wave ratio or S11 of the waveguide antenna, that is, whether the waveguide antenna is matched with air; if the amplitude of the reflected signal is at least one order of magnitude lower than that of the incident signal, the waveguide antenna is considered to be normal, otherwise it is not normal.
[0035] Therefore, the shape of the connecting surface of the waveguide antenna test piece needs to be adapted to the adapter structure, and since the size of the chip 301 is small, and the adapter structure has dozens of corresponding conductive protrusions 204, the multiple conductive protrusions 204 are arranged densely, and the matching difficulty is extremely high, which reduces the processing yield.
[0036] Based on this, the utility model provides a kind of waveguide antenna test device 100. Please refer to Figure 1The waveguide antenna testing device 100 is used for detecting the open waveguide antenna 200, and the waveguide antenna testing device 100 comprises a connecting piece 1 and a testing structure 2; two opposite sides of the connecting piece 1 form a mounting surface 1A and a testing surface 1B, the mounting surface 1A is used for abutting with an open end of the open waveguide antenna 200, the connecting piece 1 is provided with a transmission hole 11 penetrating through the testing surface 1B and the mounting surface 1A, and the transmission hole 11 is used for aligning with at least one radiation slot 202 of the open waveguide antenna 200; the testing structure 2 is arranged on the testing surface 1B and is electrically connected with the connecting piece 1, emits an electromagnetic signal towards the transmission hole 11 and receives a reflected signal.
[0037] The technical scheme of the utility model discloses connecting piece 1 is arranged at the open end of open waveguide antenna 200, and the transmission hole 11 aligning with the radiation slot 202 of open waveguide antenna 200 is set up in connecting piece 1, and the radiation slot 202 of open waveguide antenna 200 is less and sparse than the conductive protrusion 204, so as to reduce the matching difficulty of testing piece and waveguide antenna, when testing, testing structure 2 emits electromagnetic signal towards transmission hole 11 and receives reflected signal, so as to obtain the voltage standing wave ratio or S11 of open waveguide antenna 200, and the impedance of the radiation slot 202 of open waveguide antenna 200 itself and free space is matched, the electromagnetic signal emitted by testing structure 2 towards transmission hole 11 reaches free space through the radiation slot 202, and there is no obvious reflected signal, and the antenna has reciprocity, even if testing is carried out through the signal receiving path of open waveguide antenna 200, the accuracy of test result will not be affected, thereby realizing efficient and accurate waveguide antenna performance evaluation, and improving test efficiency and data reliability.
[0038] In the utility model, testing structure 2 emits electromagnetic signal, electromagnetic signal reaches the radiation slot 202 of open waveguide antenna 200 through the transmission hole of connecting piece 1, further reaches the conductive protrusion 204 through the feed line 203 of open waveguide antenna 200, at this time, the conductive protrusion 204 radiates electromagnetic signal to free space, and the reflected electromagnetic signal returns to testing structure 2 through the original path, and testing structure 2 receives and analyzes the reflected signal intensity, so as to evaluate the performance of waveguide antenna.
[0039] Please refer to Figure 4 With Figure 5In an embodiment of the present application, the transmission hole 11 comprises a test section 111, a transition section 112 and a matching section 113 connected in sequence; the test section 111 is used to correspond to the test structure 2; the transition section 112 is in communication with the test section 111, and the cross-sectional area of at least one section is set to change; the matching section 113 is in communication with the transition section 112, and the shape thereof is used to adapt to the slot of the radiation groove 202, and is used to communicate with the radiation groove 202. In this way, the test section 111 is used to correspond to the test structure 2, the electromagnetic signal emitted by the test structure 2 enters the transition section 112 through the test section 111, the transition section 112 smoothes the signal transmission by changing the cross-sectional area, and the reflection is reduced; the matching section 113 ensures the precise butt joint with the slot of the radiation groove 202, and further improves the test precision and stability.
[0040] Wherein, the test section 111 corresponding to the test structure 2 means that the end port of the test section 111 close to the test structure 2 is connected with the emission port of the test structure 2; the cross-sectional area of at least one section of the transition section 112 is set to change means that the cross-sectional area of part or all sections of the transition section 112 gradually increases from small to large or gradually decreases from large to small, and the cross-sectional size and shape of the two end faces are adapted to the test section 111 and the matching section 113 respectively; the matching section 113 is used to align the end face of the radiation groove 202, and the size and shape of the slot of the radiation groove 202 are consistent, to ensure that the electromagnetic signal has no significant loss in the transmission process of the connector 1, and the impedance matching can be realized by adjusting the length of the matching section 113.
[0041] In an embodiment of the present application, the transition section 112 is consistent with the shape of the radiation groove 202, and in the direction away from the test section 111, the cross-sectional area change trend of the transition section 112 is used to be opposite to the cross-sectional area change trend of the radiation groove 202. In this way, the transition section 112 and the radiation groove 202 are symmetrically arranged along a middle plane, so that the electromagnetic signal can smoothly transition in the transmission process, the reflection and loss are reduced, and the accuracy and reliability of the test result are further improved.
[0042] In embodiment 1, the open waveguide antenna 200 has one radiation groove 202, and one port of the test section 111 of the transmission hole 11 is directly connected with the test structure 2.
[0043] Please refer to Figure 5 and Figure 6In an embodiment of the present application, the open waveguide antenna 200 has a plurality of radiation slots 202; the test section 111, the transition section 112 and the matching section 113 jointly form a transmission unit; the transmission hole 11 has a containing section 114 and a plurality of transmission units in communication with the containing section 114; the connecting piece 1 further comprises a power divider, the power divider is arranged in the containing section 114, the power divider has an input port and a plurality of output ports, the input port is electrically connected with the test structure 2, and the plurality of output ports are respectively embedded in the plurality of test sections 111. In this way, the electromagnetic signal emitted by the test structure 2 successively passes through the power divider, the transmission unit and reaches the radiation slot 202, so as to meet the measurement requirement of the open waveguide antenna 200 of the plurality of radiation slots 202.
[0044] It should be noted that the power divider is a device for dividing one input signal energy into multiple outputs or combining multiple input signals into one. In an embodiment, the power divider is a multi-stage one-to-two power divider in series; in another embodiment, the power divider comprises a radio frequency switch matrix.
[0045] In embodiment 2, the specific parameters of the open waveguide antenna 200 and the waveguide antenna test device 100 are as follows:
[0046] The working frequency band of the open waveguide antenna 200 is 76GHz-77GHz, the plurality of radiation slots 202 are arranged at intervals along a direction to form a 1x4 array, and the four horn mouths are connected with the conductive protrusions 204 through a two-stage one-to-two power divider and a feed line; wherein each radiation slot 202 is a horn mouth, the depth of the horn mouth is 3.3mm, the cross-sectional size of the bottom of the horn mouth is consistent with the cross-sectional size of the feed line, and both are 2.8mmx1mm;
[0047] The connecting piece of the antenna test device 100 is connected with the test structure 2 through a WR12 waveguide standard part, the transmission hole 11 comprises four transmission units, the test section is consistent with the specification of the WR12 waveguide standard, the cross-sectional size is 3.1mmx1.55mm, the transition section 112 is symmetrically arranged and has the same size as the horn mouth, the ports of the four matching sections 113 are respectively aligned with the slot openings of the four horn mouths, the edges are connected, and the length of each matching section 113 is 2mm; the power divider comprises two-stage one-to-two power dividers in series.
[0048] Please refer to Figure 7 , the matching of the open waveguide antenna 200 and the waveguide antenna test device 100 after connection is shown in Figure 6 , and the voltage standing wave ratio in the range of 75.56-77.5GHz is not more than 2.5.
[0049] Please refer to Figure 6In an embodiment of the present application, the plurality of matching sections 113 in the plurality of transmission units are arranged in communication with each other. In this way, the structural design is simplified, the processing of the transmission hole 11 is facilitated, thereby reducing the manufacturing cost, while ensuring the signal synchronization between the transmission units, and further improving the stability and consistency of the overall test system.
[0050] Further, the impedance matching can be achieved by adjusting the length of the matching section 113. In embodiment 3, the specific parameters of the open waveguide antenna 200 and the waveguide antenna test device 100 are as follows:
[0051] The working frequency band of the open waveguide antenna 200 is 76GHz-77GHz, the plurality of radiation slots 202 are arranged in a direction at intervals to form a 1x4 array, and the four horn mouths are connected with the conductive protrusions 204 through a two-stage one-to-two power divider and a feed line; wherein each radiation slot 202 is a horn mouth, the depth of the horn mouth is 3.3mm, the cross-sectional size of the horn mouth bottom is consistent with the cross-sectional size of the feed line, and both are 2.8mmx1mm;
[0052] The connecting piece of the antenna test device 100 is connected with the test structure 2 through a WR12 waveguide standard part, the transmission hole 11 includes four transmission units, the test section is consistent with the specification of the WR12 waveguide standard, the cross-sectional size is 3.1mmx1.55mm, the transition section 112 is symmetrically arranged and has the same size as the horn mouth, the ports of the four matching sections 113 are respectively aligned with the slot openings of the four horn mouths, the edges are connected, and the length of each matching section 113 is 1.4mm; the power divider includes two-stage one-to-two power dividers in series.
[0053] Please refer to Figure 7 , the matching of the open waveguide antenna 200 and the waveguide antenna test device 100 after connection is shown in Figure 6 , and the voltage standing wave ratio in the range of 75.56-77.5GHz is not more than 2.5.
[0054] In an embodiment of the present application, the plurality of matching sections 113 are arranged in communication with each other to form a matching cavity, the matching cavity is filled with dielectric material, the dielectric constant of the dielectric material is ε, and 2≤ε≤5. In this way, the matching cavity effectively adjusts the propagation characteristics of electromagnetic waves, reduces signal interference, improves the accuracy and consistency of test data, and ensures the efficiency and reliability of antenna performance evaluation.
[0055] In an embodiment of the present application, the test surface 1B is plated with a surface coating material to reduce the surface roughness of the test surface 1B. In this way, by reducing the surface roughness of the test surface 1B, the scattering and reflection of electromagnetic waves are reduced, the signal transmission efficiency is improved, and the accuracy and stability of the test results are further optimized.
[0056] The surface coating material is preferably a material with high conductivity and low loss characteristics, and has a uniform thickness, effectively reducing the scattering and absorption of electromagnetic waves on the test surface 1B, further improving the signal transmission efficiency, and ensuring the accuracy and stability of the test results.
[0057] In an embodiment of the present application, the test structure 2 includes a measurement module and a calibration module; the measurement module is electrically connected with the connecting piece 1, emits electromagnetic signals and receives reflected signals, and the measurement module includes at least one of a vector network analyzer, a spectrum analyzer or a time domain reflectometer; the calibration module is electrically connected with the measurement module and is used to eliminate the measurement error of the measurement module. In this way, the authenticity and consistency of the measurement data are ensured through calibration, further improving the accuracy and reliability of the test results, and ensuring the comprehensiveness and effectiveness of the antenna performance evaluation.
[0058] The utility model also proposes a waveguide antenna test combination device, including open waveguide antenna 200 and be used to test open waveguide antenna 200's waveguide antenna test device 100, the edge of open waveguide antenna 200 is set up with a plurality of clamping slots, waveguide antenna test device 100 is used to detect open waveguide antenna 200, and waveguide antenna test device 100 includes connecting piece 1 and test structure 2, two opposite sides of connecting piece 1 form mounting surface 1A and test surface 1B, and mounting surface 1A is used to be consistent with the open end of open waveguide antenna 200, and the transmission hole 11 that is set up on connecting piece 1 is through test surface 1B and mounting surface 1A, is used to be aligned with at least one radiation slot 202 of open waveguide antenna 200, test structure 2 sets up in test surface 1B, and is electrically connected with connecting piece 1, and emits electromagnetic signals towards transmission hole 11 and receives reflected signals, and the edge of connecting piece 1 is provided with a plurality of buckles, and a plurality of buckles are adapted with a plurality of clamping slots, and are used to make transmission hole 11 and radiation slot 202 alignment. In this way, through the accurate cooperation of buckle and clamping slot, the accurate alignment of transmission hole 11 and radiation slot 202 is ensured, and since the waveguide antenna test combination device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.
[0059] In an embodiment of the present application, the material of the waveguide antenna test combination device includes a conductive material; or, the material of the waveguide antenna test combination device includes a non-conductive material, and a conductive coating material is plated on the inner wall of the transmission hole 11. In this way, there are various processing forms, which facilitate the production of the waveguide antenna test combination device. In the first implementation, the waveguide antenna test combination device is formed by CNC cutting of metal; in the second implementation, the waveguide antenna test combination device is injection molded from a plastic part or CNC cut from a plastic part, and a conductive coating is uniformly plated on the inner wall of the transmission hole 11; in the third implementation, the waveguide antenna test combination device is made by 3D printing technology.
[0060] The above merely describes exemplary embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made by using the present application specification and drawings, are included in the patent protection scope of the present application.
Claims
1. A waveguide antenna testing device for testing waveguide antennas, characterized in that, The waveguide antenna testing device is used to detect an open waveguide antenna, and the waveguide antenna testing device comprises: a connecting piece, two opposite sides of the connecting piece forming a mounting surface and a testing surface, the mounting surface being used to fit with an open end of the open waveguide antenna, the connecting piece being provided with a transmission hole penetrating through the testing surface and the mounting surface, and the transmission hole being used to align with at least one radiation slot of the open waveguide antenna; and a testing structure, provided on the testing surface and electrically connected with the connecting piece, emitting an electromagnetic signal towards the transmission hole and receiving a reflected signal.
2. The waveguide antenna test device of claim 1, wherein, The transmission hole comprises: a testing section, used to correspond to the testing structure; a transition section, in communication with the testing section, and at least one section having a variable cross-sectional area; and a matching section, in communication with the transition section, having an outer shape adapted to the slot of the radiation slot and used to communicate with the radiation slot.
3. The waveguide antenna test device of claim 2, wherein, The transition section is consistent with the outer shape of the radiation slot, and in a direction away from the testing section, the transition section has a cross-sectional area change trend opposite to that of the radiation slot.
4. The waveguide antenna test device of claim 2, wherein, The open waveguide antenna has a plurality of radiation slots; The testing section, the transition section and the matching section jointly form a transmission unit; The transmission hole has a containing section and a plurality of transmission units in communication with the containing section; The connecting piece further comprises a power divider, the power divider being provided on the containing section, the power divider having an input port and a plurality of output ports, the input port being electrically connected with the testing structure, and the plurality of output ports being respectively embedded in the plurality of testing sections.
5. The waveguide antenna test device of claim 4, wherein, The plurality of matching sections in the plurality of transmission units are arranged in communication with each other.
6. The waveguide antenna test device of claim 5, wherein, The plurality of matching sections are arranged in communication with each other to jointly form a matching cavity, the matching cavity being filled with a dielectric material, the dielectric constant of the dielectric material being ε, 2≤ε≤5.
7. The waveguide antenna test device of claim 1, wherein, The testing surface is coated with a surface coating material to reduce the surface roughness of the testing surface.
8. The waveguide antenna test device of claim 1, wherein, The testing structure comprises: a measurement module, electrically connected with the connecting piece, emitting an electromagnetic signal and receiving a reflected signal, the measurement module comprising at least one of a vector network analyzer, a spectrum analyzer or a time domain reflectometer; and a calibration module, electrically connected with the measurement module, used to eliminate measurement errors of the measurement module.
9. A waveguide antenna test assembly comprising an open waveguide antenna, characterized by, The waveguide antenna testing combination device further comprises the waveguide antenna testing device of any one of claims 1 to 8, and a plurality of clamping grooves are formed on the edge of the open waveguide antenna; The edge of the connecting piece is provided with a plurality of buckles, and the plurality of buckles are adapted to the plurality of clamping grooves to align the transmission hole with the radiation slot.
10. The waveguide antenna test device of claim 9, wherein, The material of the waveguide antenna testing combination device comprises a conductive material; or The material of the waveguide antenna testing combination device comprises a non-conductive material, and the inner wall of the transmission hole is coated with a conductive coating material.