Search

CN-122026039-A - Satellite-borne QVE frequency band large-span broadband waveguide triplexer

CN122026039ACN 122026039 ACN122026039 ACN 122026039ACN-122026039-A

Abstract

The invention discloses a star-borne QVE frequency band large-span broadband waveguide triplexer which comprises an integrated metal structure, wherein a public waveguide port (7) and three output waveguide ports are arranged on the integrated metal structure, the public waveguide port (7) is connected with a double-T-shaped branching junction (8), the double-T-shaped branching junction (8) is connected with a plurality of working channels, input signals are respectively output to the three output waveguide ports after passing through the working channels with corresponding frequencies, and an independent phase compensation section (9) is further arranged between the double-T-shaped branching junction (8) and the output waveguide ports. According to the invention, the ridge waveguide filter is introduced into the low end of the triplexer, so that the inhibition capability of the low-end channel to the middle-end and high-end working channels is greatly improved, and the phase mismatch problem caused by mixing type filter combining is improved through the phase compensation structure, so that the return loss of the three working channels at the public end is better than 25dB.

Inventors

  • LI GANG
  • YIN HAO
  • LI BO
  • HE XIAOQIANG

Assignees

  • 成都市晶林科技有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The star-borne QVE frequency band large-span broadband waveguide triplexer comprises an integrated metal structure and is characterized in that a public waveguide port (7) and three output waveguide ports are arranged on the integrated metal structure, the public waveguide port (7) is connected with a double-T-shaped branching junction (8), the double-T-shaped branching junction (8) is connected with a plurality of working channels, input signals are respectively output to the three output waveguide ports after passing through the working channels with corresponding frequencies, and an independent phase compensation section (9) is further arranged between the double-T-shaped branching junction (8) and the output waveguide ports.
  2. 2. The star-borne QVE frequency band large-span broadband waveguide triplexer according to claim 1, wherein the integrated metal structure comprises a waveguide cavity (1) and a cover plate (2), the waveguide cavity (1) and the cover plate (2) are uniformly and integrally formed, an input port (5) and an output port (6) are further arranged between the waveguide cavity (1) and the cover plate (2), the input port (5) is connected with a common waveguide port (7), and the output ports (6) are respectively connected with three output waveguide ports.
  3. 3. The satellite-borne QVE frequency band large-span broadband waveguide triplexer as claimed in claim 2, wherein a tuning screw (3) for performance debugging of the triplexer is arranged on the cover plate (2), and a lock nut (4) is further arranged on the tuning screw (3).
  4. 4. A spaceborne QVE frequency band large-span broadband waveguide triplexer as claimed in claim 1, wherein said three output waveguide ports comprise three waveguide filters connected by working channels respectively, said waveguide filters comprising a first waveguide filter (10), a second waveguide filter (11) and a third waveguide filter (12).
  5. 5. The triplexer of a large-span broadband waveguide in a QVE frequency band on a satellite vehicle according to claim 4, wherein the first waveguide filter (10) is a ridge waveguide bandpass filter, the signal is output after passing through the first channel, the output port is a BJ400 standard rectangular waveguide port, and the passband is a low frequency band.
  6. 6. The triplexer of a star QVE frequency band wide-span broadband waveguide according to claim 4, wherein the second waveguide filter (11) is a rectangular waveguide cavity filter, the signal is output after passing through the second channel, the output port is a BJ500 standard rectangular waveguide port, and the passband is the mid-band.
  7. 7. The triplexer of a star QVE band large-span broadband waveguide according to claim 4, wherein the third waveguide filter (12) is a rectangular waveguide cavity filter, the signal is output after passing through the third channel, the output port is a BJ620 standard rectangular waveguide port, and the passband is a high frequency band.
  8. 8. The star QVE frequency band large-span broadband waveguide triplexer according to any of claims 4-7, wherein passband frequencies of the first waveguide filter (10), the second waveguide filter (11) and the third waveguide filter (12) are not equally spaced, and a difference between an upper limit frequency of a low frequency band of the first waveguide filter (10) and a lower limit frequency of a high frequency band of the third waveguide filter (12) is greater than 24GHz.
  9. 9. The spaceborne QVE frequency band large-span broadband waveguide triplexer according to claim 8, wherein the first waveguide filter (10) comprises at least three-stage ridge resonant cavities, each resonant cavity is provided with a rectangular ridge extending along the propagation direction of the waveguide, and the rectangular ridges are provided with impedance matching transition structures at an input end and an output end; The second waveguide filter (11) and the third waveguide filter (12) adopt H-plane inductive window coupling structures, cross coupling is introduced between non-adjacent cavities to generate transmission zero points, and out-of-band suppression of adjacent channels is improved.
  10. 10. The spaceborne QVE frequency band large-span broadband waveguide triplexer according to claim 1, characterized in that the phase compensation section (9) comprises a first phase compensation section, a second phase compensation section and a third phase compensation section, which perform their electrical length adjustment functions by one or a combination of linear waveguide sections of different physical lengths, slow wave waveguide sections with periodic perturbation structures, and waveguide sections integrated with tuning screws; the electrical lengths of the first, second and third phase compensation sections are configured to minimize the modulus of the sum of the reflection coefficient vectors looking from the common port to the three channels.

Description

Satellite-borne QVE frequency band large-span broadband waveguide triplexer Technical Field The invention relates to the technical field of microwave devices, in particular to a satellite-borne QVE frequency band large-span broadband waveguide triplexer. Background With the development of millimeter wave communication technology, the demands of a system in which a multi-band common antenna and multiple bands operate simultaneously are increasing. The triplexer is used as a key component for realizing the synthesis and separation of multi-frequency signals, and the performance of the triplexer directly influences the index of the whole system. In QVE frequency bands, the three pass bands are 40.5-43.5GHz, 50.5-52.5GHz and 62.5-64.5GHz respectively, and a unique technical challenge is faced in that the frequency span of the lowest frequency pass band and the highest frequency pass band exceeds 24GHz, and the relative span is close to 50%. At such a wide frequency span, the filter of the low-end channel needs to not only realize the suppression of the intermediate-frequency channel, but also has extremely high suppression capability (generally required to be >60 dB) for the high-end channel with a far operating frequency band. Conventional waveguide triplexers typically employ a unified type of filter design. For low frequency channels, a common H-plane perceptual window filter, the spurious pass-band of which tends to start at 1.5 multiples of the fundamental pass-band. This means that a waveguide filter designed at 41GHz may have a first spurious passband starting from 65GHz and a limited rate of rise of stopband attenuation, albeit at a distance of 64.5GHz, and a very high rejection requirement at 64.5GHz is difficult to achieve. Ridge waveguide filters have unique dispersion characteristics in that the principal mode cut-off frequency is lower than that of a rectangular waveguide of the same size, while the cut-off frequency of the first higher order mode is pushed to a higher frequency. This feature allows the ridge waveguide filter to have a natural wide stop band characteristic-a very high level of rejection can be maintained over a wide frequency range outside the main pass band. However, the ridge waveguide filter and the waveguide cavity filter (for the medium-high frequency channel) are integrated in one triplexer, and broadband matching is realized by matching a double-T junction with three-channel independent phase compensation, so that no mature scheme exists at present. The main difficulty is that the difference of the propagation constants of the ridge waveguide and the rectangular waveguide causes the difference of equivalent impedance and phase characteristic at the double-T junction to be obvious, and the standing wave ratio of the public port can be seriously deteriorated if special compensation is not carried out. Disclosure of Invention Aiming at the technical problems, the invention provides a satellite-borne QVE frequency band large-span broadband waveguide triplexer, which is used for realizing high-frequency far-end inhibition and realizing broadband matching of a public port through three-channel independent phase compensation. The invention adopts the following technical scheme that the satellite-borne QVE frequency band large-span broadband waveguide triplexer comprises an integrated metal structure, wherein a public waveguide port and three output waveguide ports are arranged on the integrated metal structure, the public waveguide port is connected with a double-T-shaped branching junction, the double-T-shaped branching junction is connected with a plurality of working channels, input signals are respectively output to the three output waveguide ports after passing through the working channels with corresponding frequencies, and independent phase compensation sections are further arranged between the double-T-shaped branching junction and the output waveguide ports. Further, the integrated metal structure comprises a waveguide cavity and a cover plate, the waveguide cavity and the cover plate are integrally formed, an input port and an output port are further arranged between the waveguide cavity and the cover plate, wherein the input port is connected with a public waveguide port, and the output port is respectively connected with three output waveguide ports. Further, a tuning screw used for performance adjustment of the triplexer is arranged on the cover plate, and a lock nut is further arranged on the tuning screw. Further, the three output waveguide ports include three waveguide filters connected to each other through working channels, respectively, the waveguide filters including a first waveguide filter, a second waveguide filter, and a third waveguide filter. Further, the first waveguide filter is a ridge waveguide band-pass filter, the signal is output after passing through the first channel, the output port is a BJ400 standard rectangular waveguide port, and the passband