An ultra-wideband waveguide triplexer

Abstract

The invention discloses an ultra-wideband waveguide triplexer, belonging to the field of electronic communication technology. The invention comprises three rectangular waveguide filters, a waveguide transition structure and a cross-shaped waveguide joint connecting the three rectangular waveguide filters and the waveguide transition structure, and at least one through-type matching screw is arranged at each of the four waveguide joints of the cross-shaped waveguide joint; the three rectangular waveguide filters all adopt a metal diaphragm loading method; the metal diaphragm loading method is to load only the inductor diaphragm or the inductor diaphragm and the capacitor diaphragm in a cross-type simultaneous loading method; the three rectangular waveguide filters are also provided with a plurality of tuning screws at the center position of the inductor diaphragm opening or the center position of the resonant cavity, and the ridge-loaded transition waveguide section is a quarter-waveguide wavelength transition, a gradient line transition, an exponential line transition, a Klopfenstein type transition or a cosine square type transition. The invention achieves the effect of high power capacity and large bandwidth of the divider.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic communications, and in particular relates to an ultra-wideband waveguide triplexer. Background Art

[0002] In the field of wireless communication technology, frequency multiplexers are important devices for frequency selection and separation. For antennas, they can separate the transmit and receive signals to achieve duplex transmission and reception. Waveguide frequency multiplexers are a very important form of frequency multiplexers, especially in satellite communication system applications that require low loss and high power capacity. Waveguide frequency multiplexers are the preferred form. Therefore, the development of waveguide high-power multiplexers has huge market demand and broad application prospects in the field of multi-frequency shared antennas. There are mature design methods for bandpass filters and triplexers, but there are few design methods for ultra-wideband triplexers.

[0003] Xiong Rui from the University of Electronic Science and Technology of China designed an X-band seventh-order waveguide bandpass filter loaded with inductance and capacitance in the study of wide stopband characteristics of waveguide bandpass filters. The filter has a wide stopband characteristic and a bandwidth of 400MHz.

[0004] Zhang Honglin et al. disclosed a narrowband millimeter-wave waveguide triplexer in "Millimeter-wave Waveguide Triplexer", which includes three waveguide two-way power dividers and three cavity filters, and the bandwidth of each channel is 0.5 GHz.

[0005] Florian et al. in Design and Characterization of Broadband Triplexers realized a broadband triplexer based on suspended stripline technology on a dielectric substrate, which consisted of a common junction and three filters. However, the power capacity of the triplexer was low and could not meet the transmission of high-power signals such as satellite communications.

[0006] There is no known design of an ultra-wideband high-power multiplexer using a cross-shaped common connector. Summary of the invention

[0007] In view of this, the present invention proposes an ultra-wideband waveguide triplexer, which can achieve the effects of high power capacity and large bandwidth of a waveguide frequency multiplexer.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] An ultra-wideband waveguide triplexer comprises three rectangular waveguide filters 1, a waveguide transition structure 2 and a common junction connecting the three rectangular waveguide filters 1 and the waveguide transition structure 2, wherein the waveguide transition structure 2 comprises a common waveguide branch 201 and a ridge-loaded transition waveguide section 202; the common junction is a cross-shaped waveguide joint 3;

[0010] At least one through-type matching screw 301 is disposed at each of the four waveguide joints of the cross-shaped waveguide joint 3;

[0011] The three rectangular waveguide filters 1 are all loaded by metal diaphragms;

[0012] The metal diaphragm loading method includes loading only the inductor diaphragm or loading the inductor diaphragm and the capacitor diaphragm crosswise and simultaneously.

[0013] Furthermore, the ridge-loaded transition waveguide section 202 is a quarter waveguide wavelength transition, a gradient line transition, an exponential line transition, a Klopfenstein type transition or a cosine square type transition.

[0014] Furthermore, the first rectangular waveguide filter and the second rectangular waveguide filter both adopt a cross-type simultaneous loading method of the inductor diaphragm and the capacitor diaphragm, and the third rectangular waveguide filter adopts a method of only loading the inductor diaphragm;

[0015] The first rectangular waveguide filter includes eight inductor diaphragms, which divide the first rectangular waveguide filter into seven resonant cavities, and each of the seven resonant cavities is provided with a capacitive diaphragm;

[0016] The second rectangular waveguide filter includes six inductor diaphragms, which divide the second rectangular waveguide filter into five resonant cavities, and each of the five resonant cavities is provided with a capacitive diaphragm;

[0017] The third rectangular waveguide filter includes nine inductor diaphragms, and the nine inductor diaphragms divide the third rectangular waveguide filter into eight resonant cavities.

[0018] Furthermore, the three rectangular waveguide filters 1 are all loaded by tuning screws 4;

[0019] The tuning screw 4 is loaded in a manner of being arranged at a central position of an opening of the inductor diaphragm or at a central position of a resonant cavity with a plurality of tuning screws 4 .

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the background technology:

[0021] 1. The waveguide triplexers of the present invention all adopt cavity design. Considering the high frequency of use, in order to reduce the impact of processing, the small-size structural parameters are constrained, and can withstand very high power capacity.

[0022] 2. The present invention is based on a novel cross common joint matching design and a broadband ridge-loaded waveguide transition structure design, combined with a wide passband filter design, and the bandwidths of the three passband frequency bands of the triplexer are very large.

[0023] 3. The passband and stopband indicators of the present invention are well designed. When the passband is better than 1dB insertion loss, the out-of-band suppression of the three frequency bands is greater than 60dB, and the out-of-band suppression level is relatively high.

[0024] 4. The present invention loads the inductor and capacitor diaphragms for interactive tuning, which increases the degree of optimization freedom, effectively suppresses the generation of high-order modes, and improves system design indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural block diagram of an ultra-wideband waveguide triplexer in an embodiment of the present invention;

[0026] Figure 2 is a three-dimensional simulation model of the third filter in the embodiment of the present invention;

[0027] Figure 3 is a graph of S(1,1) parameters of an ultra-wideband waveguide triplexer according to an embodiment of the present invention;

[0028] Figure 4 is a graph of S(2,1) parameters of an ultra-wideband waveguide triplexer in an embodiment of the present invention;

[0029] Figure 5 is a graph of S(3,1) parameters of an ultra-wideband waveguide triplexer according to an embodiment of the present invention;

[0030] Figure 6 4 is a graph showing an S(4,1) parameter of an ultra-wideband waveguide triplexer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] An ultra-wideband waveguide triplexer comprises three rectangular waveguide filters 1, a waveguide transition structure 2 and a common junction connecting the three rectangular waveguide filters 1 and the waveguide transition structure 2, wherein the waveguide transition structure 2 comprises a common waveguide branch 201 and a ridge-loaded transition waveguide section 202; the common junction is a cross-shaped waveguide joint 3;

[0033] At least one through-type matching screw 301 is disposed at each of the four waveguide joints of the cross-shaped waveguide joint 3;

[0034] The three rectangular waveguide filters 1 are all loaded by metal diaphragms;

[0035] The metal diaphragm loading method includes loading only the inductor diaphragm or loading the inductor diaphragm and the capacitor diaphragm crosswise and simultaneously.

[0036] Furthermore, the ridge-loaded transition waveguide section 202 is a quarter waveguide wavelength transition, a gradient line transition, an exponential line transition, a Klopfenstein type transition or a cosine square type transition.

[0037] Furthermore, the first rectangular waveguide filter and the second rectangular waveguide filter both adopt a cross-type simultaneous loading method of the inductor diaphragm and the capacitor diaphragm, and the third rectangular waveguide filter adopts a method of only loading the inductor diaphragm;

[0038] The first rectangular waveguide filter includes eight inductor diaphragms, which divide the first rectangular waveguide filter into seven resonant cavities, and each of the seven resonant cavities is provided with a capacitive diaphragm;

[0039] The second rectangular waveguide filter includes six inductor diaphragms, which divide the second rectangular waveguide filter into five resonant cavities, and each of the five resonant cavities is provided with a capacitive diaphragm;

[0040] The third rectangular waveguide filter includes nine inductor diaphragms, and the nine inductor diaphragms divide the third rectangular waveguide filter into eight resonant cavities.

[0041] Furthermore, the three rectangular waveguide filters 1 are all loaded by tuning screws 4;

[0042] The tuning screw 4 is loaded in a manner of being arranged at a central position of an opening of the inductor diaphragm or at a central position of a resonant cavity with a plurality of tuning screws 4 .

[0043] Specifically, the relevant design indicators of the ultra-wideband waveguide triplexer in this embodiment are as follows:

[0044] S1. Simulation optimization design of the first filter

[0045] The frequency band of the first filter is 25.75 GHz to 29.68 GHz, with a bandwidth of 12%, an insertion loss of less than 1 dB, and an out-of-band suppression of more than 60 dB within the passband of the second and third filters. The resonant cavity of the first filter uses a standard waveguide BJ320 with a width of 7.112 mm and a height of 3.556 mm. The specific design indicators of the first filter are shown in Tables 1, 2, and 3.

[0046] [Table 1] Lengths of seven resonant cavities of the first filter (mm)

[0047] al1 al2 al3 al4 al5 al6 al7 2.6 2.6 2.7 2.8 2.7 2.6 2.8

[0048] [Table 2] Horizontal opening width of eight inductor diaphragms of the first filter (mm)

[0049] aw1 aw2 aw3 aw4 aw5 aw6 aw7 aw8 5.7 3.7 3.4 3.4 3.4 3.4 3.7 5.7

[0050] [Table 3] Longitudinal thickness of seven capacitor diaphragms in the first filter (mm)

[0051] aww1 ww2 ww3 ww4 ww5 ww6 ww7 1.2 0.6 0.6 0.6 0.6 0.6 1.2

[0052] S2. Simulation optimization design of the second filter

[0053] The frequency band of the second filter is 35.2GHz to 40.75GHz, with a bandwidth of 13%, an insertion loss of less than 1dB, an out-of-band suppression of more than 60dB in the passband of the first filter, and more than 80dB in the passband of the third filter. The resonant cavity of the second filter adopts the standard waveguide BJ320, with a width of 7.112mm and a height of 3.556mm. The second filter adopts a symmetrical structure, and the specific design indicators of the filter are shown in Table 4, Table 5 and Table 6.

[0054] [Table 4] Length of the first five resonant cavities of the second filter (mm)

[0055] bl1 bl2 bl3 bl4 bl5 1.8 2.6 2.6 2.8 2.8

[0056] [Table 5] Horizontal opening width of the first six inductor diaphragms of the second filter (mm)

[0057] bw1 bw2 bw3 bw4 bw5 bw6 4.5 3.1 2.9 2.8 2.8 2.8

[0058] [Table 6] Longitudinal thickness of the first five capacitor diaphragms of the second filter (mm)

[0059] bd1 bd2 bd3 bd4 bd5 0.7 0.7 1.2 0.6 0.6

[0060] S3. Simulation optimization design of the third filter

[0061] like Figure 2 As shown, the frequency band range of the third filter is: 44.43GHz ~ 49.74GHz, the bandwidth is 10%, the insertion loss is less than 1dB, the out-of-band suppression in the passband of the first filter is greater than 60dB, and the out-of-band suppression in the passband of the second filter is greater than 80dB. The output port of the third filter adopts the standard waveguide BJ500, the waveguide mouth width is 4.78mm, and the height is 2.39mm. The specific design indicators of the third filter are shown in Tables 7 and 8.

[0062] [Table 7] Length of eight resonant cavities of the third filter (mm)

[0063]

[0064]

[0065] [Table 8] Horizontal opening width of nine inductor diaphragms of the third filter (mm)

[0066] cw1 cw2 cw3 cw4 cw5 cw6 cw7 cw8 cw9 3.7 2.9 2.7 2.6 2.5 2.5 2.6 2.8 3.6

[0067] S4. Design of cross-shaped common joint

[0068] Figure 1 A structural schematic diagram of the designed ultra-wideband waveguide triplexer is given. The input waveguide of the cross-shaped common connector is directly connected to filter two, and filters one and three are directly connected. The input port and the three filter output ends form a cross. The optimal coordinate position of the matching screws is selected through optimization calculation to take into account the impedance matching of the three filters and meet the electrical indicators of the branch passband transmission, so as to achieve the matching of the common branches of the three channels of the ultra-wideband triplexer and reduce the mutual influence of the signals of the three filter channels.

[0069] S5. Triplexer overall simulation optimization processing test

[0070] Select a suitable transition structure to achieve the transition from ridge waveguide to rectangular waveguide.

[0071] S6. Triplexer overall simulation test

[0072] The three bandpass filters with different frequency ranges designed according to steps S1, S2, and S3, as well as the cross-shaped common joint and transition structure designed according to steps S4 and S5 are connected together. Figure 3 The optimized S(1,1) parameter simulation diagram of the ultra-wideband triplexer is given. Figure 4 The optimized S(2,1) parameter simulation diagram of the ultra-wideband waveguide triplexer is given. Figure 5 The optimized S(3,1) parameter simulation diagram of the ultra-wideband triplexer is given. Figure 6 The optimized S(4,1) parameter simulation diagram of the ultra-wideband triplexer is given. Figure 3 , 4 It can be seen from Figures 5, 6 that the return loss within the three passbands is large, the insertion loss is small, and the out-of-band suppression is very high.

[0073] It should be noted that the above description and examples are helpful for those skilled in the art to understand the invention, but they do not limit the protection scope of the invention. Any various deformations, scaling, modifications and / or simplifications that do not deviate from the essence of the invention should fall within the protection scope of the invention.

Claims

1. An ultra-wideband waveguide triplexer, comprising three rectangular waveguide filters (1), a waveguide transition structure (2), and a common junction connecting the three rectangular waveguide filters (1) and the waveguide transition structure (2), wherein the waveguide transition structure (2) comprises a common waveguide branch (201) and a ridge-loaded transition waveguide section (202); characterized in that: The common junction is a cross-shaped waveguide joint (3); The ridge-loaded transition waveguide section (202) is a quarter-waveguide wavelength transition, a gradient line transition, an exponential line transition, a Klopfenstein type transition or a cosine square type transition; At least one through-type matching screw (301) is provided at each of the four waveguide joints of the cross-shaped waveguide joint (3); The three rectangular waveguide filters (1) all adopt a metal diaphragm loading method; The metal diaphragm loading method is to load only the inductor diaphragm or to load the inductor diaphragm and the capacitor diaphragm crosswise at the same time; The three rectangular waveguide filters (1) also all adopt a tuning screw (4) loading method; The tuning screw (4) is loaded in a manner of multiple tuning screws (4) being arranged at the center of an opening of an inductor diaphragm or at the center of a resonant cavity.

2. The ultra-wideband waveguide triplexer according to claim 1, characterized in that: The first rectangular waveguide filter and the second rectangular waveguide filter both adopt a cross-type simultaneous loading method of the inductor diaphragm and the capacitor diaphragm, and the third rectangular waveguide filter adopts a method of only loading the inductor diaphragm; The first rectangular waveguide filter includes eight inductor diaphragms, which divide the first rectangular waveguide filter into seven resonant cavities, and each of the seven resonant cavities is provided with a capacitive diaphragm; The second rectangular waveguide filter includes six inductor diaphragms, which divide the second rectangular waveguide filter into five resonant cavities, and each of the five resonant cavities is provided with a capacitive diaphragm; The third rectangular waveguide filter includes nine inductor diaphragms, and the nine inductor diaphragms divide the third rectangular waveguide filter into eight resonant cavities.

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