A millimeter-wave one-to-three waveguide power divider with DGS

Abstract

The present invention discloses a millimeter-wave one-to-three waveguide power divider, an equal power divider with a power distribution ratio of 1:1 carrying DGS, the output ends of the equal power divider are respectively connected to unequal power dividers with a power distribution ratio of 2:1 carrying DGS, the adjacent output ends of the two unequal power dividers are respectively connected to a combiner, the output end of the combiner is one of the power division output ports, the other two output ends of the two unequal power dividers are respectively connected to H-plane 90° curved waveguides with phase compensation, the output ends of the two H-plane 90° curved waveguides are the other two power division output ports, thereby forming a millimeter-wave band one-to-three waveguide power divider. The power divider and the combiner are both designed using multi-stage ladder impedance transformation technology, which can achieve a wide bandwidth. The DGS structure added by the present invention not only suppresses out-of-band harmonics, but also enables more uniform metallization after 3D printing.

Description

Technical Field

[0001] The invention belongs to the technical field of radio frequency and microwave power synthesis, and in particular relates to a millimeter wave one-to-three waveguide power divider carrying DGS. Background Art

[0002] Power divider is a microwave passive device widely used in satellite communication, radar detection, navigation and other fields. Power divider can divide the energy of one input signal into two or more equal or unequal energy outputs to meet the system's multi-channel output needs; it can also combine the energy of multiple channels into one output, which can also be called a combiner, which can be used to meet the system's high-power output needs.

[0003] In the millimeter wave band, compared with other types of feeder power dividers, waveguide power dividers have the advantages of low loss, good standing wave, and wide transmission bandwidth. The number of existing power dividers is mostly 2 to the power of n, which makes it difficult to realize an odd-numbered or even-numbered power divider.

[0004] Multi-channel waveguide power dividers generally have multiple regular or irregular protrusions or curved structures, which lead to complex out-of-band harmonics of the signal and introduce interference. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a millimeter-wave one-to-three waveguide power divider with a DGS structure. The power divider and the combiner are designed using multi-step ladder impedance transformation technology to achieve a wider bandwidth. The DGS structure added in the present invention plays a role in suppressing out-of-band harmonics.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a millimeter-wave one-to-three waveguide power divider carrying DGS, comprising an equal power divider, an unequal power divider, a combiner and an H-plane 90° curved waveguide, the equal power divider carries a DGS, the two output ends of the equal power divider are respectively connected to the unequal power divider carrying the DGS, the power distribution ratio of the unequal power divider is 2:1, the adjacent output ends of the two unequal power dividers are respectively connected to the combiner, the output end of the combiner is one of the power division output ports, the other output end of the unequal power divider is respectively connected to the H-plane 90° curved waveguide with phase compensation effect, the output ends of the two H-plane 90° curved waveguides are the other two power division output ports, forming a millimeter-wave band one-to-three waveguide power divider, the input and output ports of the equal power divider, the unequal power divider and the combiner all adopt a multi-stage ladder impedance transformation structure.

[0007] The waveguide corners of the equal power divider use a 45° cut to make a 90° turn.

[0008] A DGS hole is set at the input port of the equal power divider.

[0009] The unequal power divider achieves unequal power dividing ratios by changing the position of the protrusion deviating from the center line, the width and the height of the protrusion.

[0010] Add a DGS hole at the input port of the unequal power divider.

[0011] The step matching structure at the input end of the equal power divider is connected to the first port of the equal power divider of the standard waveguide port BJ320, the first port of the equal power divider is directly connected to the first matching section of the input equal power divider, and the second matching section and the input matching section of the input equal power divider are connected in sequence; the step matching structure at the output end is connected to the second port of the equal power divider of the standard waveguide port BJ320 and the T-junction, the T-junction is directly connected to the first output matching section of the equal power divider, and the second output matching section and the third output matching section of the equal power divider are connected in sequence, and then connected to the second port of the equal power divider.

[0012] The step matching structure at the input end of the unequal power divider is connected to the first port of the unequal power divider of the standard waveguide port BJ320, the first port of the unequal power divider is directly connected to the first input matching section of the unequal power divider, and then connected to the second input matching section of the unequal power divider; the step matching structure at the output end is connected to the second port of the unequal power divider of the standard waveguide port BJ320 and the T-junction of the unequal power divider, the T-junction of the unequal power divider is directly connected to the first output matching section of the unequal power divider, and then connected to the second output matching section of the unequal power divider, and finally connected to the second port of the unequal power divider.

[0013] The step matching structure at the input end of the combiner is connected to the first port of the combiner of the standard waveguide port BJ320, the first port of the combiner is directly connected to the first input matching section of the combiner, and then connected to the second input matching section of the combiner; the step matching structure at the output end is connected to the second port of the combiner of the standard waveguide port BJ320 and the combiner T-junction, the combiner T-junction is directly connected to the first output matching section of the combiner, and is sequentially connected to the second output matching section of the combiner, the third output matching section of the combiner, and then connected to the second port of the combiner.

[0014] The H-plane 90° bend waveguide with phase compensation function uses two sizes of 2.4×90° chamfer 403 and (2.4+7.112)×90° chamfer 404 at the 90° turn and the input port 402 is 4.4 mm long.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The power divider and combiner of the present invention both adopt multi-step ladder impedance transformation technology, and achieve excellent performance such as small insertion loss, relatively consistent amplitude and phase, and good standing wave ratio within a wider bandwidth: the DGS added in the present invention has a good suppression effect on out-of-band harmonics, reduces interference, and makes the subsequent metal spraying more uniform after 3D printing processing; the present invention is simple in design, and only needs to design the various components included and then directly connect them, without the need for overall optimization simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention without DGS.

[0019] FIG3 is a schematic diagram of the structure of each component in an embodiment of the present invention, wherein (a) is an equal power divider with a power distribution ratio of 1:1, (b) is an unequal power divider with a power distribution ratio of 2:1, (c) is a combiner, and (d) is an H-plane 90° bent waveguide with phase compensation function.

[0020] 4 is a schematic diagram of simulation results of an embodiment of the present invention, wherein (a) is an insertion loss diagram of a one-to-three power divider, (b) is a phase diagram of a one-to-three power divider, and (c) is a standing wave diagram of a one-to-three power divider.

[0021] FIG5 is a comparison diagram of simulation results of two one-to-three power splitters with and without DGS according to an embodiment of the present invention, wherein (a) is a simulation result diagram of a one-to-three power splitter without DGS, and (b) is a simulation result diagram of a one-to-three power splitter with DGS.

[0022] In the figure: 1 is an equal power divider, 2 is an unequal power divider, 3 is a combiner, 4 is an H-plane 90° bend waveguide, and 5 is a DGS hole. DETAILED DESCRIPTION

[0023] The present invention is described in detail below through the accompanying drawings and examples. It is necessary to point out that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention.

[0024] See also Figure 1The present invention provides a millimeter-wave one-to-three waveguide power divider carrying a DGS (Defected Ground Structure), comprising: an equal power divider 1 with a power distribution ratio of 1:1 and carrying a DGS hole 5, the output ends of the equal power divider 1 are respectively connected to unequal power dividers 2 with a power distribution ratio of 2:1 and carrying a DGS hole 5, the adjacent output ends of the two unequal power dividers 2 are respectively connected to a combiner 3, the output end of the combiner 3 is one of the power division output ports, the other two output ends of the two unequal power dividers 2 are respectively connected to an H-plane 90° bent waveguide 4 with a phase compensation function, and the output ends of the two H-plane 90° bent waveguides are the other two power division output ports, thereby forming a millimeter-wave band one-to-three waveguide power divider.

[0025] Referring to FIG. 3 , the step matching structure at the input end of the equal power divider with a power distribution ratio of 1:1 is connected to the first port 101 of the equal power divider of the standard waveguide port BJ320, and the first port 101 of the equal power divider is directly connected to the first matching section 102 of the input equal power divider, and is sequentially connected to the second matching section 103 and the input matching section 104 of the input equal power divider; the step matching structure at the output end is connected to the second port 109 of the equal power divider of the standard waveguide port BJ320 and the T-junction 105, and the T-junction 105 is directly connected to the first output matching section of the equal power divider. 106, connected in sequence to the second output matching section 107 of the equal power divider, the third output matching section 108 of the equal power divider, and then connected to the second port 109 of the equal power divider; the widths of the first output matching section 106 of the equal power divider, the second output matching section 107 of the equal power divider, and the third output matching section 108 of the equal power divider are gradually reduced; the step matching structure at the input end of the unequal power divider with a power distribution ratio of 2:1 is connected to the first port 201 of the unequal power divider of the standard waveguide port BJ320, and the first port 201 of the unequal power divider is directly connected to the unequal power divider The first input matching section 202 is then connected to the second input matching section 203 of the unequal power divider; the step matching structure at the output end is connected to the second port 207 of the unequal power divider and the T-junction 204 of the unequal power divider of the standard waveguide port BJ320; the T-junction 204 of the unequal power divider is directly connected to the first output matching section 205 of the unequal power divider, and then connected to the second output matching section 206 of the unequal power divider, and finally connected to the second port 207 of the unequal power divider. The step matching structure at the input end of the combiner (3) is connected to the The first port 301 of the combiner is directly connected to the first input matching node 302 of the combiner, and then connected to the second input matching node 303 of the combiner; the step matching structure at the output end is connected to the second port 308 of the combiner and the combiner T-junction 304 of the standard waveguide port BJ320, the combiner T-junction 304 is directly connected to the first output matching node 305 of the combiner, and is sequentially connected to the second output matching node 306 of the combiner, the third output matching node 307 of the combiner, and then connected to the second port 308 of the combiner.

[0026] In this preferred embodiment, Figure 1 and Figure 2 As shown in the figure, the dimensions of the input waveguide port and the three output ports of the one-to-three power splitter are all the dimensions of the standard waveguide port BJ320, 7.112mm×3.556mm, and the dimensions of the three DGS holes 5 are all 4mm long, 0.2mm wide, and 3mm thick.

[0027] Refer to Figure 3. In the embodiment of the present invention, the equal power divider with a power distribution ratio of 1:1 has a completely symmetrical structure. The first port 101 of the equal power divider and the second port 109 of the equal power divider are both the sizes of the standard waveguide port BJ320. The first port 101 of the equal power divider is 7.112 mm wide and 4 mm long. The second port 109 of the equal power divider is 7.112 mm wide and 6 mm long. The first matching section 102 of the input equal power divider is 11.9 mm wide and 2.6 mm long. The second matching section 103 of the input equal power divider is 7.3 mm wide and 1.8 mm long. The input matching section 104 is 9.6 mm wide and 3 mm long, the T-junction 105 is 6.8 mm wide and 10.8 mm long, the first output matching section 106 of the equal power divider is 6.1 mm wide and 4.2 mm long, the second output matching section 107 of the equal power divider is 5.6 mm wide and 3.5 mm long, the third output matching section 108 of the equal power divider is 5.4 mm wide and 2.5 mm long, the a of the 45° cut angle 110 is 4.3 mm, the center protrusion 208 is 1 mm wide and 2.9 mm high, and the realized power distribution ratio is 1:1 of the equal power divider. In the embodiment of the present invention, the unequal power divider has a power distribution ratio of 2:1, the first port 201 of the unequal power divider and the second port 207 of the unequal power divider are both the size of the standard waveguide port BJ320, the first port 201 of the unequal power divider is 7.112mm wide and 3.2mm long, the second port 207 of the unequal power divider is 7.112mm wide and 1.5mm long, the first input matching section 202 of the unequal power divider is 6.5mm wide and 1.6mm long, the second input matching section 203 of the unequal power divider is 6.1mm wide and 1.3mm long, the T-junction 204 of the unequal power divider is 6.7mm wide and 8.7mm long, the first output matching section 205 of the unequal power divider is 5.5mm wide and 1.3mm long, the second output matching section 206 of the unequal power divider is 5.8mm wide and 1.7mm long, the protrusion 208 is 0.7mm wide and 3.2mm high, and the deviation from the center line b is 1.2 mm, realizing an unequal power divider with a power distribution ratio of 2:1. The structure in the embodiment of the present invention is completely symmetrical on the left and right. The first port 301 of the combiner and the second port 308 of the combiner are both of the size of the standard waveguide port BJ320. The first port 301 of the combiner is 7.112 mm wide and 2.3 mm long. The second port 308 of the combiner is 7.112 mm wide and 4 mm long. The first input matching section 302 of the combiner is 10.7 mm wide and 1.3 mm long. The second input matching section 303 of the combiner is 5.9 mm wide and 2.2 mm long. The T-junction 304 of the combiner is 6.7 mm wide and 9.2 mm long. The first output matching section 305 of the combiner is 9.8 mm wide and 2.2 mm long. The second connection output matching section 306 of the combiner is 6.6 mm wide and 1.2 mm long. The third connection output matching section 307 of the combiner is 11 mm wide and 1.6 mm long. The central protrusion 309 is 0.8 mm wide and 2.5 mm high, so as to realize the combiner.In the embodiment of the present invention, the H-plane 90° curved waveguide (d) with phase compensation function, ports 401 and 402 have the size of the standard waveguide port BJ320, port 401 is 7.112 mm wide and 16.1 mm long, port 402 is 7.112 mm wide and 4.4 mm long, the curved structure 403 has a chamfer of 2.4×90°, and the curved structure 404 has a chamfer of (2.4+7.112)×90°, realizing an H-plane 90° curved waveguide with phase compensation function.

[0028] Figure 4 is a simulation result diagram of an embodiment of the present invention. It can be seen from the figure that within the frequency range of 35GHz~40GHz, the insertion loss is <0.57dB, the phase difference is <9.7°, and the standing wave is <1.33. It can be clearly seen from the simulation result comparison diagram of Figure 5 that the out-of-band harmonics of the one-to-three power splitter with DGS are significantly suppressed.

Claims

1. A millimeter-wave one-to-three waveguide power divider carrying DGS, characterized in that: It includes an equal power divider, an unequal power divider, a combiner and an H-plane 90° curved waveguide. The equal power divider carries a DGS. The two output ends of the equal power divider are respectively connected to the unequal power divider carrying the DGS. The power distribution ratio of the unequal power divider is 2:

1. The adjacent output ends of the two unequal power dividers are respectively connected to the combiner. The output end of the combiner is one of the power division output ports. The other output end of the unequal power divider is respectively connected to the H-plane 90° curved waveguide with phase compensation function. The output ends of the two H-plane 90° curved waveguides are the other two power division output ports, forming a millimeter wave band one-to-three waveguide power divider The input and output ports of the equal power divider, the unequal power divider and the combiner all adopt a multi-step ladder impedance transformation structure; the ladder matching structure at the input end of the combiner is connected to the first port of the combiner of the standard waveguide port BJ320, the first port of the combiner is directly connected to the first input matching section of the combiner, and then connected to the second input matching section of the combiner; the ladder matching structure at the output end is connected to the second port of the combiner of the standard waveguide port BJ320 and the combiner T-junction, the combiner T-junction is directly connected to the first output matching section of the combiner, and is connected to the second output matching section of the combiner, the third output matching section of the combiner, and the second output matching section of the combiner. The step matching structure at the input end of the equal power divider is connected to the first port of the equal power divider of the standard waveguide port BJ320, the first port of the equal power divider is directly connected to the first matching section of the input equal power divider, and the second matching section and the input matching section of the input equal power divider are connected in sequence; the step matching structure at the output end is connected to the second port of the equal power divider of the standard waveguide port BJ320 and the T-junction, the T-junction is directly connected to the first output matching section of the equal power divider, and the second output matching section and the third output matching section of the equal power divider are connected in sequence. The output matching section is then connected to the second port of the equal power divider; the step matching structure at the input end of the unequal power divider is connected to the first port of the unequal power divider of the standard waveguide port BJ320, the first port of the unequal power divider is directly connected to the first input matching section of the unequal power divider, and then connected to the second input matching section of the unequal power divider; the step matching structure at the output end is connected to the second port of the unequal power divider of the standard waveguide port BJ320 and the unequal power divider T-junction, the unequal power divider T-junction is directly connected to the first output matching section of the unequal power divider, and then connected to the second output matching section of the unequal power divider, and finally connected to the second port of the unequal power divider.

2. The millimeter-wave one-to-three waveguide power divider carrying DGS according to claim 1, characterized in that: The waveguide corners of the equal power divider use a 45° cut to make a 90° turn.

3. The millimeter-wave one-to-three waveguide power divider carrying DGS according to claim 1, characterized in that: The unequal power divider achieves unequal power dividing ratios by changing the position of the protrusion deviating from the center line, the width and the height of the protrusion.

4. The millimeter-wave one-to-three waveguide power divider carrying DGS according to claim 1, characterized in that: The H-plane 90° bend waveguide with phase compensation function uses two sizes of 90° bend angle 2.4×90° and bending structure chamfer (2.4+7.112)×90° and an input port length of 4.4mm.

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