A wideband radio frequency power combiner based on t-waveguide and double-ridge waveguide

Abstract

The application relates to a broadband radio frequency power combiner based on a T waveguide and a double-ridge waveguide, belonging to the field of waveguide devices, which comprises a combining structure, a T waveguide output port, a T waveguide input port and a double-ridge waveguide load port; two T waveguide input ports are connected at two ends of the combining structure through input port transition structures respectively, and the top of the T waveguide output port is connected with the input port transition structures; the double-ridge waveguide load port is connected with the combining structure through a load port transition structure; a matching step one is arranged at the middle of the back of the combining structure, one end of the matching step one extends longitudinally to the top of the T waveguide output port, and the other end extends to the double-ridge waveguide load port. The application has the advantages of the T waveguide power divider / combiner, such as wide working bandwidth, high combining efficiency, large power capacity and binary combining branch expansion, and the matching step one and the matching step two on the combining structure are connected with the double-ridge waveguide load, so that the application also has the advantage of high isolation.

Description

Technical Field

[0001] This invention relates to the field of waveguide devices, and more particularly to a broadband radio frequency power combiner based on a T-waveguide and a double-ridged waveguide. Background Technology

[0002] As the demands of complete systems for transmitter output power and bandwidth increase, the output power of a single power amplifier is limited due to factors such as materials and heat dissipation, making it difficult to meet high power requirements. Furthermore, power combining multiple power amplifiers presents significant challenges in the design of broadband RF power combiners.

[0003] Common RF power combiners are mainly divided into stripline RF power combiners and waveguide RF power combiners. Stripline RF power combiners have advantages such as simple design, easy fabrication, and wide bandwidth. However, due to limitations in materials and fabrication precision, as the operating frequency increases, insertion loss increases and phase consistency deteriorates, leading to lower combining efficiency. Waveguide RF power combiners have advantages such as low insertion loss, large power capacity, and high fabrication precision. However, ordinary T-waveguide power dividers / combiners have poor isolation, conventional waveguide magic T-combiners have narrow bandwidth, and traditional double-ridged waveguide magic T-combiners are difficult to fabricate. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a broadband radio frequency power combiner based on T-waveguide and double-ridge waveguide, thus solving the deficiencies of the prior art.

[0005] The objective of this invention is achieved through the following technical solution: a broadband radio frequency power combiner based on T-waveguides and double-ridge waveguides, the combiner comprising a combining structure, a T-waveguide output port, two T-waveguide input ports, and a double-ridge waveguide load port;

[0006] Two T-waveguide input ports are connected to the two ends of the synthesized structure through input port transition structures, and the top of the T-waveguide output port is connected to the input port transition structure; the double-ridge waveguide load port is connected to the synthesized structure through a load port transition structure.

[0007] Matching step one is provided in the middle of the back side of the composite structure. One end of matching step one extends longitudinally to the top of the T-waveguide output port, and the other end extends to the double-ridge waveguide load port. Matching step two is provided on the side wall of the double-ridge waveguide load port. Matching step one and matching step two together form the two ridges of the double-ridge waveguide load port. Matching step one and matching step two reduce the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

[0008] The matching step has a five-step structure from the distance from the load port of the double-ridge waveguide to the distance from the load port of the double-ridge waveguide. The five-step structure includes a first step, a second step, a third step, a fourth step, and a fifth step.

[0009] The first, second, and third steps, which extend from the load port of the double-ridged waveguide to the load port, gradually decrease in size on the sidewall of the composite structure to improve the isolation between the two T-waveguide input ports and simultaneously reduce the return loss of the double-ridged waveguide load port.

[0010] The fourth and fifth steps, from the distance from the load port of the double-ridged waveguide to the distance from the load port, form a gradually increasing structure in the load port transition structure and the sidewall of the load port of the double-ridged waveguide. This gradually increases the inter-wall capacitance, contracts the electric field within the waveguide, reduces the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

[0011] The matching step two includes a sixth step and a seventh step from the distance from the load port of the double-ridged waveguide to the distance from the load port of the double-ridged waveguide; the sixth step and the seventh step are two steps that gradually increase in height to increase the inter-wall capacitance, shrink the electric field in the waveguide, reduce the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

[0012] The two T-waveguide input ports are designed symmetrically about the synthetic structure. The input port transition structure, the T-waveguide input port and the T-waveguide output port are all composed of a wide part and a narrow part.

[0013] The wide portion of the input port transition structure has a three-segment progressively narrowing structure, and the width ratio of the three-segment narrowing structure is 1.2-2:1-1.5:1;

[0014] The narrow section of the input port transition structure gradually narrows in three stages until it aligns with the composite structure. The width of the three-stage gradually narrowing structure is equal to the width of the composite structure, and the distance ratio from the narrow section of the three-stage gradually narrowing structure to the back of the composite structure is 1:0.5~0.8:0.2~0.5.

[0015] The external corners of the steps in the two adjacent segments of the three-section progressively narrowing structure are rounded with the same radius.

[0016] The width and thickness of the narrow portions of the T-waveguide input port and T-waveguide output port are the same as the width and thickness of the composite structure.

[0017] The width and thickness of the wide portion of the T-waveguide input port and the T-waveguide output port are the same.

[0018] The four corners of the load port transition structure are rounded; the positive corners formed by the matching step one and matching step two with the composite structure, the load port transition structure, and the double-ridge waveguide load port are rounded.

[0019] This invention offers the following advantages: a broadband RF power combiner based on T-waveguides and double-ridged waveguides combines the advantages of T-waveguide power dividers / combiners, such as wide operating bandwidth, high combining efficiency, large power capacity, and the ability to expand the number of binary combining paths. Furthermore, the matching steps one and two on the combining structure connect to the double-ridged waveguide load, giving this invention the high isolation between the two input ports of traditional power dividers / combiners based on rectangular or double-ridged waveguides. It is highly suitable for millimeter-wave broadband high-power combining applications and has significant practical value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0022] Figure 3 This is a top view of the present invention;

[0023] Figure 4 This is a cross-sectional view of the present invention;

[0024] Figure 5 This is a schematic diagram of a T-waveguide;

[0025] In the diagram: 1-Synthetic structure, 2-T-waveguide output port, 3-T-waveguide input port, 4-Double-ridge waveguide load port, 5-Matching step one, 6-Input port transition structure, 7-Load port transition structure, 8-Matching step two, 9-Wide section, 10-Narrow section, 501-First step, 502-Second step, 503-Third step, 504-Fourth step, 505-Fifth step, 801-Sixth step, 802-Seventh step. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application provided below with reference to the accompanying drawings is not intended to limit the scope of protection of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figures 1-4 As shown, this invention specifically relates to an isolated broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide, comprising a combining structure 1, a T-waveguide output port 2, two T-waveguide input ports 3, and a double-ridge waveguide load port 4; wherein the combining structure 1 specifically refers to... Figures 1-3 The part circled in the middle refers to a whole structure.

[0028] The two T-waveguide input ports 3 are connected to the two ends of the composite structure 1 through the input port transition structure 6, and the top of the T-waveguide output port 2 is connected to the input port transition structure 6; the double-ridge waveguide load port 4 is connected to the composite structure 1 through the load port transition structure 7.

[0029] A matching step 5 is provided in the middle of the back side of the composite structure 1. One end of the matching step 5 extends longitudinally to the top of the T-waveguide output port 2, and the other end extends to the double-ridge waveguide load port 4. A matching step 8 is provided on the side wall of the double-ridge waveguide load port 4. The matching step 5 and the matching step 8 together form the two ridges of the double-ridge waveguide load port 4. The low-frequency cutoff point of the waveguide is reduced by the matching step 5 and the matching step 8, thereby expanding the bandwidth. The double-ridge waveguide load port 4 can be connected to a standard double-ridge waveguide matching load.

[0030] Furthermore, the matching step 5 has a five-step structure from the distance from the double-ridge waveguide load port 4 to the distance from the distance from the double-ridge waveguide load port 4. The five-step structure includes a first step 501, a second step 502, a third step 503, a fourth step 504, and a fifth step 505.

[0031] Among them, the first step 501, the second step 502 and the third step 503, which are far away from the double-ridged waveguide load port 4 and close to the double-ridged waveguide load port 4, have a progressively decreasing structure on the side wall of the composite structure 1, so as to improve the isolation between the two T-waveguide input ports 3 and at the same time improve the return loss of the double-ridged waveguide load port 4.

[0032] From the fourth step 504 and the fifth step 505, which are far from the load port 4 of the double-ridged waveguide, to the sidewalls of the load port transition structure 7 and the load port 4 of the double-ridged waveguide, the structure gradually increases the inter-wall capacitance, shrinks the electric field in the waveguide, reduces the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

[0033] Furthermore, the matching step 2 8 includes a sixth step 801 and a seventh step 802 extending from the load port 4 of the double-ridged waveguide to the load port 4 of the double-ridged waveguide; the sixth step 801 and the seventh step 802 are two-stage stepped structures that gradually increase the inter-wall capacitance, shrink the electric field in the waveguide, reduce the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

[0034] Furthermore, such as Figure 5 As shown, the two T-waveguide input ports 3 are designed symmetrically about the synthetic structure 1. The input port transition structure 6, the T-waveguide input port 3 and the T-waveguide output port 2 are all composed of a wide part 9 and a narrow part 10.

[0035] The wide portion 9 of the input port transition structure 6 has a three-stage progressively narrowing structure, and the width ratio of the three-stage narrowing structure of the wide portion 9 is 1.2~2:1~1.5:1;

[0036] The narrow portion 10 of the input port transition structure 6 gradually narrows in a three-stage step-by-step manner until it is aligned with the composite structure 1. The width of the three-stage step-by-step narrowing structure of the narrow portion 10 is equal to the width of the composite structure 1, and the distance ratio from the narrow portion 10 of the three-stage step-by-step narrowing structure to the back of the composite structure 1 is 1:0.5~0.8:0.2~0.5.

[0037] Furthermore, the external corners of the steps of the adjacent two segments of the three-section progressively narrowing structure, the wide part 9 and the narrow part 10, are rounded with the same radius.

[0038] The width and thickness of the narrow portion 10 of the T-waveguide input port 3 and the T-waveguide output port 2 are the same as the width and thickness of the composite structure 1.

[0039] The width and thickness of the wide portion 9 of the T-waveguide input port 3 and the T-waveguide output port 2 are the same.

[0040] The four corners of the load port transition structure 7 are rounded; the positive corners formed by matching step 1 5 and matching step 2 8 with the composite structure 1, the load port transition structure 7, and the double-ridge waveguide load port 4 are rounded.

[0041] In use, the synthesizer of this invention can perform power combining of two signals, and can also be expanded to combine the power of two signals. n The two signals are power combined. During power combining, each signal enters the combining structure 1 through two T-waveguide input ports 3 and is output from the T-waveguide output port 2. The unbalanced component between the two signals and the reflected signal from the combined output reach the double-ridged waveguide load port 4, where they are absorbed by the external double-ridged waveguide matched load and are not reflected back to the T-waveguide input port 3. This mechanism improves the impedance matching between the power amplifier and the power combiner, enhances the safety of the power amplifier, and avoids device damage caused by port mismatch. The combining efficiency can reach over 95%, and the return loss can be below -20dB.

[0042] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and improvements, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide, characterized in that: The synthesizer includes a synthesizing structure (1), a T-waveguide output port (2), two T-waveguide input ports (3), and a double-ridge waveguide load port (4). Two T-waveguide input ports (3) are connected to the two ends of the composite structure (1) through input port transition structure (6), and the top of the T-waveguide output port (2) is connected to the input port transition structure (6); the double-ridge waveguide load port (4) is connected to the composite structure (1) through load port transition structure (7); Matching step one (5) is provided in the middle of the back side of the composite structure (1). One end of matching step one (5) extends longitudinally to the top of the T-waveguide output port (2), and the other end extends to the double-ridge waveguide load port (4). Matching step two (8) is provided on the side wall of the double-ridge waveguide load port (4). Matching step one (5) and matching step two (8) together form the two ridges of the double-ridge waveguide load port (4), and the low-frequency cutoff point of the waveguide is reduced by matching step one (5) and matching step two (8), thereby expanding the bandwidth. The matching step one (5) has a five-step structure from the distance from the double-ridge waveguide load port (4) to the distance from the distance from the double-ridge waveguide load port (4). The five-step structure includes a first step (501), a second step (502), a third step (503), a fourth step (504), and a fifth step (505). The matching step two (8) includes a sixth step (801) and a seventh step (802) from the distance from the load port (4) of the double-ridged waveguide to the distance from the load port (4) of the double-ridged waveguide; the sixth step (801) and the seventh step (802) are two-stage step structures that gradually increase the inter-wall capacitance, shrink the electric field in the waveguide, reduce the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

2. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 1, characterized in that: The first step (501), the second step (502) and the third step (503) from the farthest point of the double-ridged waveguide load port (4) to the nearest point of the double-ridged waveguide load port (4) form a progressively decreasing structure on the sidewall of the composite structure (1) to improve the isolation between the two T-waveguide input ports (3) and at the same time improve the return loss of the double-ridged waveguide load port (4).

3. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 1, characterized in that: From the fourth step (504) away from the double-ridged waveguide load port (4) to the fifth step (505) near the double-ridged waveguide load port (4), the structure rises step by step in the load port transition structure (7) and the sidewall of the double-ridged waveguide load port (4) to gradually increase the inter-wall capacitance, shrink the electric field in the waveguide, reduce the port impedance and the low-frequency cutoff point of the waveguide, thereby expanding the bandwidth.

4. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 1, characterized in that: The two T-waveguide input ports (3) are designed symmetrically about the synthetic structure (1). The input port transition structure (6), the T-waveguide input port (3) and the T-waveguide output port (2) are all composed of a wide part (9) and a narrow part (10). The wide part (9) of the input port transition structure (6) is a three-segment progressively narrowing structure, and the width ratio of the three-segment narrowing structure of the wide part (9) is 1.2~2:1~1.5:1; The narrow part (10) of the input port transition structure (6) gradually transitions to the alignment with the composite structure (1) in a three-stage step-by-step narrowing structure. The width of the three-stage step-by-step narrowing structure of the narrow part (10) is equal to the width of the composite structure (1), and the distance ratio from the narrow part (10) of the three-stage step-by-step narrowing structure to the back of the composite structure (1) is 1:0.5~0.8:0.2~0.

5.

5. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 4, characterized in that: The external corners of the steps of the two adjacent segments of the three-segment stepped narrowing structure (9) and (10) are rounded with the same radius.

6. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 4, characterized in that: The width and thickness of the narrow portion (10) of the T-waveguide input port (3) and the T-waveguide output port (2) are the same as the width and thickness of the composite structure (1); The width and thickness of the wide portion (9) of the T-waveguide input port (3) and the T-waveguide output port (2) are the same.

7. A broadband radio frequency power combiner based on a T-waveguide and a double-ridge waveguide according to claim 1, characterized in that: The four corners of the load port transition structure (7) are rounded; the positive corners formed by the matching step one (5) and matching step two (8) with the composite structure (1), the load port transition structure (7), and the double-ridge waveguide load port (4) are rounded.

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