Desensitization easy-to-process high-power millimeter wave waveguide matching load and application

Abstract

The invention provides a desensitization easy-to-process high-power millimeter wave waveguide matching load and application, the desensitization easy-to-process high-power millimeter wave waveguide matching load comprises a circular waveguide horn antenna and a high-loss dielectric block used for absorbing electromagnetic waves, and the circular waveguide horn antenna comprises a standard rectangular waveguide section, a rectangular waveguide-circular waveguide transition structure, a circular waveguide section, a conical horn and a circular waveguide section; the high-loss dielectric block comprises a bottom circular truncated cone, a middle circular truncated cone and a top circular truncated cone structure which are connected in sequence; the top circular truncated cone structure is a gradually-changing solid structure or a core-removing structure with a wedge-shaped block removed, and electromagnetic waves are fed into the circular waveguide horn antenna from the rectangular waveguide and are converted into dielectric loss by the high-loss dielectric block when reaching the tail of the horn antenna, so that incident electromagnetic energy is absorbed, and the dielectric loss of the horn antenna is reduced. The top circular truncated cone structure of the dielectric block is used for impedance matching and reflection reduction; the core circular truncated cone structure of the core-removing structure further reduces the sensitivity of the matching load performance to the precision error of the dielectric block due to the fact that the matching structure is located at the position with a weak electric field.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a desensitized and easily processed high-power millimeter wave waveguide matching load and its application. Background Art

[0002] Matching load is a passive device used to absorb the power of incident microwave signals. It is in the form of coaxial line, strip line, waveguide, etc. It is usually used to match the non-connected ports of multi-port devices such as power dividers and multiplexers. It is an important component of microwave measuring instruments, communications and radar systems. From the perspective of microwave networks, matching load is a single-port network. Ideally, its return loss is zero. In practical applications, the return loss of the matching load is generally required to be greater than 20 dB.

[0003] According to the size of microwave power absorbed by the matching load, the matching load is generally divided into small-power matching load, medium-power matching load and high-power matching load. The matching load of stripline and coaxial line structure is generally a small-power load, and the microwave power absorbed is generally in the microwatt, milliwatt and watt levels; while the medium-power load can absorb microwave power of tens to hundreds of watts; the high-power load can absorb microwave power of hundreds of watts or even tens of kilowatts, and generally the high-power matching load is mostly a waveguide structure. This high-power matching load is widely used in high-power microwave scenarios such as high-power microwave weapons, high-power radars and impact radars, and high-power microwave plasma systems, and the demand is urgent.

[0004] In addition to the structural characteristics of the matching load, the absorbing material used also determines the power capacity of the matching load to a certain extent. When the electromagnetic parameters of the microwave absorbing material loaded by the matching load change or even break down under the action of high-power microwaves, the return loss of the matching load will increase, and the corresponding enhanced reflected signal will enter the measurement channel, which will affect the stability of the system. Microwave absorbing materials generally convert microwave power into heat energy in the form of electrical loss, dielectric loss, and magnetic loss. Therefore, in the application scenario of high-power matching loads, microwave absorbing materials are required to meet the following characteristics: high power stability tolerance, good temperature characteristics, and good mechanical properties; within a certain frequency band, it has a sufficiently large attenuation; it has high high temperature and chemical stability; it is easy to process and has a certain mechanical strength. At present, the microwave absorbing materials used in high-power matching loads abroad are mainly porous carburized beryllium oxide ceramics, metal ceramics, silicon carbide ceramics, etc.

[0005] High-power matching loads are generally used to absorb continuous wave microwave energy. In order to dissipate the absorbed microwave energy in time, heat dissipation devices such as air cooling or water cooling are often used, resulting in a complex structure and bulky volume of the measurement system. Commonly used high-power matching loads can be divided into two categories according to the absorber: water loads and dry loads. Water loads generally use flowing liquid as microwave absorbing materials, which have the advantages of high power bearing and good vacuum performance. However, the strength is poor. Once leaked, it will cause damage to the microwave system. In addition, its structure relies on the peripheral water circulation heat dissipation system, which has a complex structure and limits its application scenarios. Dry loads generally use solid dielectrics or sprayed materials as absorbing materials. It has a simple structure, small size and reliable performance. Traditional dry high-power matching loads are generally realized by inserting high-loss dielectric materials into waveguides or coaxial cavities, and the high-loss dielectric materials generally used are made into wedge shapes to reduce reflected waves and achieve complete absorption of microwave energy.

[0006] However, as the application frequency band gradually expands to the millimeter wave band, the traditional dry high-power matching load design method has been challenged. Due to the short wavelength of millimeter waves, the corresponding millimeter wave devices are small in size, requiring the process technology to have fine processing accuracy and assembly technology. The traditional structure of the waveguide matching load is small in size, and the high-loss dielectric material is difficult to accurately process into the required shape; and due to the small size of the cavity, it is easy to introduce additional errors during the assembly process; in addition, due to the small cavity of the matching load, its power capacity and thermal performance are also challenged. Therefore, the traditional cavity structure matching load is not suitable for the design of high-power matching loads in the millimeter wave band. Summary of the invention

[0007] The main purpose of the present invention is to provide a desensitized and easy-to-process high-power millimeter-wave waveguide matching load design method, aiming to solve the difficulties in the design and preparation of millimeter-wave band waveguide matching loads.

[0008] To achieve the above-mentioned purpose, the present invention provides a desensitized and easy-to-process high-power millimeter-wave waveguide matching load, a circular waveguide horn antenna and a high-loss dielectric block for absorbing electromagnetic waves, wherein the circular waveguide horn antenna comprises a standard rectangular waveguide, a rectangular waveguide-circular waveguide transition structure, a circular waveguide section, a conical horn and a circular waveguide section at the tail of the conical horn; the high-loss dielectric block is a multi-stage frustum-shaped structure, specifically comprising a bottom frustum, an intermediate frustum and a top frustum structure connected in sequence, the top frustum structure extends into the circular waveguide section at the tail of the conical horn, and the top frustum structure is inserted and fixed from the tail end of the horn antenna.

[0009] Furthermore, the horn antenna structure replaces the rectangular waveguide cavity structure, and the cavity size of the horn antenna structure increases, and the size of the corresponding high-loss dielectric block increases.

[0010] Furthermore, a circular waveguide horn antenna excited by a standard rectangular waveguide is used.

[0011] Furthermore, the high-loss dielectric block is made of SiC material.

[0012] Furthermore, a heat conducting layer is coated on the surface of the high-loss dielectric block.

[0013] Furthermore, a wedge-shaped structure is removed from the top truncated cone structure to form a wedge-shaped notch, and the inner side of the wedge-shaped notch of the high-loss dielectric block is installed parallel to the long side of the rectangular waveguide of the circular waveguide horn antenna. The concave dielectric block structure with a top cut corner is adopted, so that the matching structure is located at a position with a weak electric field, which further reduces the electric field strength at the matching structure. Since it is attached to the metal wall, it is easy to dissipate heat, reducing the risk of local overheating and bursting. At the same time, since the matching structure is located at a position with a weak electric field, its performance is less sensitive to precision errors.

[0014] Furthermore, the top frustum structure is a gradient solid structure.

[0015] Furthermore, the circular waveguide horn antenna and the high-loss dielectric block are integrally formed.

[0016] Furthermore, the standard rectangular waveguide-circular waveguide transition structure is used for structural and mode conversion, and the electromagnetic wave mode in the truncated cone horn is HE 11 model.

[0017] The high-power millimeter-wave waveguide matching load described above in the present invention is used to be connected to a matching power divider or multiplexer to absorb the incident microwave signal power.

[0018] Furthermore, the horn antenna structure replaces the traditional rectangular waveguide cavity structure. The cavity size of the horn antenna structure increases, and the size of the corresponding high-loss dielectric block increases, which is convenient for processing and assembly, and reduces the requirements of device performance on processing technology and assembly accuracy.

[0019] The present invention provides a desensitized and easy-to-process high-power millimeter-wave waveguide matching load, comprising a circular waveguide horn antenna and a high-loss dielectric block for absorbing electromagnetic waves, wherein the circular waveguide horn antenna is composed of a standard rectangular waveguide section, a rectangular waveguide-circular waveguide transition structure, a circular waveguide section, a conical horn and a circular waveguide section located at the tail of the conical horn; the high-loss dielectric block is a dielectric block made of high-loss material in a truncated cone shape, specifically composed of two layers of stepped truncated cones and a truncated cone structure located at the top; the top truncated cone structure is a gradient solid structure or a core-removed structure with a wedge-shaped block removed, and electromagnetic waves are fed from the rectangular waveguide into the circular waveguide horn antenna, and when reaching the tail of the horn antenna, they are converted into dielectric loss by the high-loss high-loss dielectric block, thereby absorbing the incident electromagnetic energy, and the top truncated cone structure of the dielectric block is used for impedance matching to reduce reflection; the core truncated cone structure of the core-removed structure is used for impedance matching to reduce reflection, and at the same time, because the matching structure is located at a position with a weak electric field, the sensitivity of the matching load performance to the accuracy error of the dielectric block is reduced. Since the cavity size is increased by using a horn antenna, the processing and assembly accuracy requirements of the dielectric block and the cavity are reduced. At the same time, due to the increase in the cavity, the electric field strength at the center of the cavity is reduced compared with the electric field strength at the center of the rectangular waveguide, which reduces the risk of breakdown due to excessive center voltage and improves power tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the prior art solutions, the drawings used in the embodiments or the prior art solutions are briefly introduced below. It should be noted that the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0021] Figure 1 An oblique axonometric diagram of a desensitized and easily processed high-power millimeter-wave waveguide matching load A provided in an embodiment of the present invention; Figure 2 A top view of a desensitized and easily processed high-power millimeter-wave waveguide matching load A provided in an embodiment of the present invention; Figure 3 The simulation result of the return loss of a high-power millimeter-wave waveguide matched load A provided by an embodiment of the present invention; Figure 4 An oblique axonometric diagram of a desensitized and easily processed high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention; Figure 5 A top view of a desensitized and easily processed high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention; Figure 6 A side view of a desensitized and easily processed high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention; Figure 7 The simulation results of the return loss of a high-power millimeter-wave waveguide matched load B that is desensitized and easy to process provided by an embodiment of the present invention.

[0022] In the attached drawings, 11-standard rectangular waveguide, 12-rectangular waveguide-circular waveguide transition structure, 13-circular waveguide section, 14-conical horn, 15-tail circular waveguide section, 21-top conical structure, 22-middle conical, 23-bottom conical. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the description of the embodiments of the present invention, it needs to be understood that the orientations or positional relationships indicated by terms such as "top surface", "bottom surface", "left side", "right side", "horizontal direction" and "vertical direction" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and it cannot be determined that the indicated elements or devices are in a specific orientation.

[0025] In the description of the embodiments of the present invention, the structural dimensions given are preferred parameters. With reference to the embodiments of the present invention, the dimensional parameters of each component may be modified to further obtain the actual required performance.

[0026] See also Figure 1 and Figure 2 , Figure 1 An oblique axonometric diagram of a desensitized and easily processed high-power millimeter-wave waveguide matching load A provided in an embodiment of the present invention, Figure 2 A top view of a desensitized and easily processable high-power millimeter-wave waveguide matching load A provided in an embodiment of the present invention.

[0027] The high-power millimeter wave waveguide matching load A includes: a circular waveguide horn antenna excited by a rectangular waveguide and a multi-stage truncated cone-shaped high-loss high-loss dielectric block. Specifically, the circular waveguide horn antenna A includes a standard rectangular waveguide section 11, a rectangular waveguide-circular waveguide transition structure 12, a circular waveguide section 13, a truncated cone horn 14, and a tail circular waveguide section 15 located at the tail of the truncated cone horn. The standard rectangular waveguide section 11 is used to adapt to the standard rectangular waveguide flange and feed, and the rectangular waveguide-circular waveguide transition structure 12 is used for structure and mode conversion. The mode of the electromagnetic wave in the truncated cone horn 14 is HE11 mode, and its electric field energy is concentrated at the center of the truncated cone horn. The stepped truncated cone-shaped high-loss dielectric block 12 includes a bottom truncated cone 23, an intermediate truncated cone 22 and a top truncated cone structure 21 connected in sequence, wherein the top truncated cone structure 21 is used for progressive impedance matching and partial absorption of electromagnetic energy. Since the electric field at the center of the cavity of the circular waveguide horn antenna is much smaller than the electric field strength at the center of the traditional rectangular waveguide, the performance of the waveguide matching load is also weakened to the precision error of the high-loss dielectric block, thereby reducing the precision requirements for the processing and assembly of the waveguide matching load. At the same time, since the electric field strength at the location of the high-loss dielectric block is reduced, its power capacity is enhanced, and since the tail 22 of the high-loss dielectric block fits the metal wall of the horn antenna, heat can be quickly conducted through the metal wall, reducing the risk of the dielectric block bursting due to heat accumulation. The middle cone 22 of the high-loss dielectric block should fit the circular waveguide section 15 at the tail of the horn antenna, and is the main part for absorbing electromagnetic waves; and the diameter of the bottom cone 23 should be larger than the diameter of the circular waveguide section 15 at the tail of the horn antenna, so that the high-loss dielectric block can be fixedly installed at the tail of the horn antenna and absorb the remaining electromagnetic wave energy at the same time.

[0028] The size of the standard rectangular waveguide in the embodiment of the present invention is the size of the WR-10 standard rectangular waveguide in the W band, which is , the length of the rectangular waveguide section 11 is 2.05 mm. The length of the circular waveguide section 13 is 2.52 mm, the diameter is 3.15 mm, and the length of the standard rectangular waveguide-circular waveguide transition structure 12 is 9.8 mm. The bottom diameter of the truncated cone horn 14 is 3.15 mm, the top diameter is 9.11 mm, and its length is 14.68 mm. The diameter of the circular waveguide section 15 at the tail of the horn antenna tail section is 9.11 mm and the length is 3.96 mm. The bottom truncated cone 23 of the high-loss dielectric block has a diameter of 14 mm and a length of 4.0 mm. The middle layer truncated cone 22 of the high-loss dielectric block has a diameter of 9.11 mm and a length of 4.17 mm, which is the same size as the inner diameter of the circular waveguide at the tail of the horn antenna. The top truncated cone 21 of the high-loss dielectric block has a bottom diameter of 9.11 mm, a top diameter of 0.3 mm, a length of 9.1 mm, and a chamfered diameter at the top corner of 0.2 mm. In practical applications, the size of the prepared high-loss dielectric block should be slightly smaller than the internal size of the horn antenna to facilitate embedded installation. In order to enhance the heat dissipation effect, a layer of thermal conductive glue can be applied on the surface of the high-loss dielectric block to facilitate the embedding and heat dissipation of the dielectric block, effectively improving its power capacity and thermal performance. The SiC material used here has good thermal properties and high loss properties. Its dielectric constant is 13 and its loss tangent is 0.2, which is very suitable for the design of high-power waveguide matching loads.

[0029] Figure 3The simulation results of a desensitized and easy-to-process high-power millimeter-wave waveguide matching load provided by an embodiment of the present invention are shown in the figure. As can be seen from the figure, the high-power millimeter-wave waveguide matching load has a good absorption effect on electromagnetic waves in the entire W band, and the minimum return loss in the band is 27.6 dB.

[0030] See also Figure 4 , Figure 5 and Figure 6 , Figure 4 An oblique axonometric diagram of a desensitized and easily processed high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention, Figure 5 A top view of a desensitized and easily processed high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention, Figure 6 A side view of a desensitized and easily processable high-power millimeter-wave waveguide matching load B provided in an embodiment of the present invention.

[0031] The high-power millimeter wave waveguide matching load B includes: a circular waveguide horn antenna excited by a rectangular waveguide and a multi-stage truncated cone-shaped high-loss dielectric block. Specifically, the circular waveguide horn antenna includes a standard rectangular waveguide section 11, a rectangular waveguide-circular waveguide transition structure 12, a circular waveguide section 13, a truncated cone horn 14, and a tail circular waveguide section 15 located at the tail of the truncated cone horn. The standard rectangular waveguide section 11 is used to adapt to the standard rectangular waveguide flange and feed, and the standard rectangular waveguide-circular waveguide transition structure 12 is used for structure and mode conversion. The mode of the electromagnetic wave in the truncated cone horn 14 is HE 11 mode, whose electric field energy is concentrated at the center of the truncated cone horn. The stepped truncated cone-shaped high-loss dielectric block includes a bottom truncated cone 23, a middle truncated cone 22 and a top truncated cone structure 21 connected in sequence, wherein the top truncated cone structure 21 is de-cored, which means that a wedge-shaped dielectric with a section of truncated cone removed from the center is used for progressive impedance matching and partial absorption of electromagnetic energy. Since the electric field of the circular waveguide horn antenna is mainly concentrated at the center of the horn, and the top de-cored truncated cone structure 21 fits the metal wall of the horn antenna, avoiding the position of the strongest electric field, and heat can be quickly conducted through the metal wall, further reducing the risk of voltage breakdown and heat accumulation causing the dielectric block to burst. The middle truncated cone 22 of the high-loss dielectric block should fit the circular waveguide section 15 at the tail of the horn antenna, which is the main part of absorbing electromagnetic waves; and the diameter of the bottom truncated cone 23 should be larger than the diameter of the circular waveguide section 15 at the tail of the horn antenna, so that the dielectric block can be fixedly installed at the tail of the horn antenna and absorb the remaining electromagnetic wave energy at the same time. At the same time, since the gradient impedance matching structure of the high-loss dielectric block, that is, the top truncated cone structure 21 of the high-loss dielectric block without the core is located at a position with a weaker electric field, the sensitivity of the return loss to the processing precision error is further reduced.

[0032] The size of the standard rectangular waveguide in the embodiment of the present invention is the size of the WR-10 standard rectangular waveguide in the W band, which is , its long side is parallel to the center line of the cut corner of the high-loss dielectric block, and the length of the rectangular waveguide section 11 is 2 mm. The length of the circular waveguide section 13 is 2 mm, the diameter is 3.8 mm, and the length of the transition structure 12 of the standard rectangular waveguide-circular waveguide is 5.77 mm. The bottom diameter of the truncated cone horn 14 is 3.8 mm, the top diameter is 8.02 mm, and its length is 10.91 mm. The diameter of the circular waveguide section 15 at the tail of the horn antenna tail section is 8.02 mm and the length is 3.96 mm. The bottom cone 23 of the high-loss dielectric block has a diameter of 11.02 mm and a length of 3.96 mm. The middle cone 22 of the high-loss dielectric block has a diameter of 8.02 mm and a length of 3.96 mm, which are the same as the inner diameter of the circular waveguide at the tail section of the horn antenna. The top cone 21 of the high-loss dielectric block has a bottom diameter of 8.02 mm, a top diameter of 4.47 mm, and a length of 9.18 mm. The cut angle in the middle of the top cone structure 21 is an isosceles wedge structure, and its length, i.e., the length of the gradient structure, is 7.54 mm, and the chamfer diameter at the top corner of the cut angle is 0.2 mm. In practical applications, the size of the prepared high-loss dielectric block should be slightly smaller than the internal size of the horn antenna to facilitate embedded installation. In order to enhance the heat dissipation effect, a layer of thermal conductive glue can be applied on the surface of the high-loss dielectric block to facilitate the embedding and heat dissipation of the dielectric block, effectively improving its power capacity.

[0033] In principle, the selection of the high-loss dielectric block needs to have a moderate dielectric constant, high dielectric loss, good thermal stability and thermal conductivity, etc. Generally, ceramic resin, silicon nitride and other dielectric materials with high loss and good thermal properties can be selected. Silicon carbide (SiC) materials are widely used in the industry due to their stable chemical properties, high thermal conductivity, small thermal expansion coefficient, good wear resistance and other characteristics. At the same time, SiC also has the advantages of small size, light weight and high strength. In addition to having good thermal properties, the SiC material used here also has high loss characteristics. Its dielectric constant is 13 and its loss tangent is 0.2, which is very suitable for the design of high-power waveguide matching loads.

[0034] Figure 7 The simulation results of a desensitized and easy-to-process high-power millimeter-wave waveguide matching load B provided by an embodiment of the present invention are shown in the figure. As can be seen from the figure, the high-power millimeter-wave waveguide matching load has a good absorption effect on electromagnetic waves in the entire W band, and the minimum return loss in the band is 27.3 dB.

[0035] The present invention discloses a desensitized and easy-to-process high-power millimeter wave waveguide matching load, which relates to the field of millimeter waves. The high-power millimeter wave waveguide matching load structure includes a circular waveguide horn antenna and a high-loss dielectric block for absorbing electromagnetic waves. The circular waveguide horn antenna is composed of a standard rectangular waveguide section, a rectangular waveguide-circular waveguide transition structure, a circular waveguide section, a conical horn and a circular waveguide section located at the tail of the conical horn: and the high-loss dielectric block is a dielectric block prepared from a high-loss SiC material into a multi-level truncated cone shape. Specifically, two structures can be adopted. Structure one is composed of two layers of stepped truncated cones and a truncated cone structure located at the top, and structure two is composed of two layers of stepped truncated cones and a core-removed truncated cone structure located at the top. The high-loss dielectric block is inserted and fixed from the tail end of the horn antenna. The dielectric block scheme one is centrally symmetrical and has no installation direction requirements, while the dielectric block scheme two should be installed with its cut angle parallel to the long side direction of the rectangular waveguide of the horn antenna. Electromagnetic waves are fed from the rectangular waveguide and converted into heat energy in the high-loss dielectric block at the tail end of the horn antenna, thereby achieving the absorption of electromagnetic waves. Since the use of the horn antenna increases the size of the cavity, the processing and assembly accuracy requirements of the dielectric block and the cavity are reduced. At the same time, due to the increase in the cavity, the electric field strength at the center of the cavity is reduced compared with the electric field strength at the center of the rectangular waveguide, which reduces the risk of breakdown due to excessive center voltage and improves power tolerance. In addition, the second dielectric block scheme adopts a concave dielectric block structure with a top cut corner, so that the matching structure is in a position with a weaker electric field, further reducing the electric field strength at the matching structure. Since it fits the metal wall, it is easy to dissipate heat, reducing the risk of local overheating and bursting. At the same time, since the matching structure is in a position with a weaker electric field, its performance is less sensitive to precision errors.

[0036] The above is a description of a desensitized and easy-to-process high-power millimeter-wave waveguide matching load design method provided by the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A desensitized and easily processed high-power millimeter wave waveguide matching load, characterized in that: A circular waveguide horn antenna and a high-loss dielectric block for absorbing electromagnetic waves. The circular waveguide horn antenna comprises a standard rectangular waveguide section (11), a rectangular waveguide-circular waveguide transition structure (12), a circular waveguide section (13), a conical horn (14), and a tail circular waveguide section (15) located at the tail of the conical horn. The high-loss dielectric block is a multi-stage truncated cone structure, specifically comprising a bottom truncated cone (23), an intermediate truncated cone (22), and a top truncated cone structure (21) connected in sequence. The top truncated cone structure (21) extends into the tail circular waveguide section (15) at the tail of the conical horn. The top truncated cone structure (21) is inserted and fixed from the tail end of the horn antenna.

2. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The horn antenna structure (1) replaces the rectangular waveguide cavity structure, and as the cavity size of the horn antenna structure (1) increases, the size of the corresponding high-loss dielectric block increases.

3. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: A circular waveguide horn antenna using standard rectangular waveguide excitation.

4. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The high-loss dielectric block (2) is made of SiC material.

5. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The surface of the high-loss dielectric block is coated with a thermally conductive layer.

6. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: A wedge-shaped structure is removed from the top truncated cone structure (21) to form a wedge-shaped notch, and the inner side surface of the wedge-shaped notch of the high-loss dielectric block (2) is installed parallel to the long side direction of the rectangular waveguide of the circular waveguide horn antenna (1).

7. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The top frustum structure (21) is a gradual solid structure.

8. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The circular waveguide horn antenna and the high-loss dielectric block are both integrally formed.

9. The high-power millimeter-wave waveguide matching load according to claim 1, characterized in that: The standard rectangular waveguide-circular waveguide transition structure (12) is used for structural and mode conversion, and the electromagnetic wave mode in the truncated cone horn (14) is HE 11 model.

10. Application of the high-power millimeter wave waveguide matching load according to any one of claims 1 to 9, characterized in that: Used to connect to a matching power divider or multiplexer to absorb the incident microwave signal power.

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