Satellite-borne Q / V frequency band receiving and transmitting integrated feed source network

Abstract

The invention provides a satellite-borne Q / V frequency band receiving and transmitting integrated feed source network, and the network comprises a light wall shaping horn which employs a two-segment function shaping design; a square-circular conversion waveguide; the partition plate circular polarizer is connected with the output end of the light wall forming horn through the square-circular conversion waveguide, the partition plate circular polarizer comprises a partition plate, and the partition plate adopts a multi-stage step form; a bent waveguide; and the low-pass filter and the high-pass filter are arranged in parallel and are connected to the partition plate circular polarizer through the bent waveguide.

Description

Technical Field

[0001] The invention relates to a satellite-borne Q / V frequency band transceiver integrated feed network. Background Art

[0002] With the rapid growth of the demand for satellite communications, higher requirements are placed on the operating frequency of feeder links and intersatellite link antennas. Satellite communications usually use Ku / Ka band resources, which have gradually become saturated. With the increasing difficulty of frequency coordination and the substantial increase in demand for communication capacity and bandwidth, international commercial communication satellites are gradually moving towards higher frequency bands.

[0003] As an important part of satellite communications, the core of the work of onboard antennas lies in the feed network. At present, the feed network technology in the low-frequency band is relatively mature, while the research in the Q / V band is relatively small; and in the millimeter wave band, the wavelength is short and the processing difficulty is high.

[0004] The existing feed network is mainly concentrated in dual-bands such as C / Ku, X / Ka and Ku / Ka, with low frequencies and mostly ground-level application scenarios. There is a lack of Q / V-band feeds that can be applied to spaceborne.

[0005] The traditional satellite-borne dual-frequency dual-circular polarization feed network usually consists of: a horn (of which corrugated horns are more common, and multi-mode horns can also be used), a circular polarizer, an orthogonal mode coupler, and a filter. The overall structure is relatively complex. Since the above components are mostly arranged in a straight line, the axial length of the feed network is relatively large, which is not easy to miniaturize the antenna.

[0006] As the frequency increases, the wavelength becomes smaller. The corrugations of the corrugated horn and the traditional corrugated circular polarizer are difficult and expensive to process. Large processing errors will lead to a decrease in feed performance. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems and provide a dual-frequency dual circular polarization feed network for Q / V bands, which can be applied to intersatellite links.

[0008] The present application provides a satellite-borne Q / V band transceiver integrated feed network, including:

[0009] The light wall shaping speaker adopts a two-stage function shaping design;

[0010] Square-circle conversion waveguide;

[0011] The partition circular polarizer is connected to the output end of the light wall shaping horn through a square-circle conversion waveguide, and the partition circular polarizer includes a partition, which is in the form of multiple steps;

[0012] Bend waveguide;

[0013] The low-pass filter and the high-pass filter are arranged in parallel and connected to the partition circular polarizer through the curved waveguide.

[0014] In at least one embodiment, wherein using sin p The contour of the light wall horn is shaped by a function cascade of Gaussian functions.

[0015] In at least one embodiment, wherein, wherein sin p The function expression is as follows:

[0016]

[0017] The expression of Gaussian function is as follows:

[0018]

[0019] Among them, p = 0.75, a i is the radius of the input circular waveguide of the horn, a0 is the input aperture of the Gaussian function; L is the overall length of the horn, L1 is the length of the sinusoidal function part, and q is a parameter that determines the output aperture size.

[0020] In at least one embodiment, the baffle circular polarizer integrates the functions of the OMT and the circular polarizer.

[0021] In at least one embodiment, the partition adopts 8 steps.

[0022] In at least one embodiment, the specific parameters of the 8-step height are as follows: h1 = 0.094λ c 、h2=0.142λ c 、h3=0.098λ c 、h4=0.097λ c 、h5=0.089λ c 、h6=0.080λ c 、h7=0.021λ c 、h8=0.041λ c , where λ c is the wavelength corresponding to the working center frequency.

[0023] In at least one embodiment, the specific parameters of the 8-step length are as follows: l1 = 0.249λ c , l2=0.085λ c , l3=0.066λ c , l4=0.23λ c , l5=0.249, l6=0.265λ c , l7=0.124λc , l8=0.132λ c , where λ c is the wavelength corresponding to the working center frequency.

[0024] In at least one embodiment, the bending angle of the curved waveguide is 90°.

[0025] In at least one embodiment, the light-wall shaped horn has an input port that is a circular waveguide, the radius of the circular waveguide is selected so that the signal operates in a single-mode state, and the main transmission mode of the circular waveguide is the TE11 mode.

[0026] In at least one embodiment, the low-pass filter is an eighth-order branch filter, the high-pass filter 6 is a ninth-order branch filter, and the external interfaces are all standard waveguide ports.

[0027] The speaker part of the feed network of the present invention adopts a light wall shaped speaker, which has the characteristics of simple processing, low cost, and small mass at high frequencies. The circular polarizer of the feed network of the present invention adopts a partition circular polarizer, which has a simple structure and is easy to process, and the entire feed system does not need a separate orthogonal mode coupler structure, which greatly reduces the overall size of the feed network and is conducive to the miniaturization design of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following will further explain the above characteristics, technical features, advantages and implementation methods of the present application in a clear and understandable manner through the description of the preferred embodiments and in combination with the accompanying drawings. The following drawings are only intended to illustrate and explain the present application, and do not limit the scope of the present application. Among them:

[0029] Figure 1 A side view of a satellite-borne Q / V band transceiver integrated feed network according to the present application is shown;

[0030] Figure 2 A cross-sectional view of a satellite-borne Q / V band transceiver integrated feed network according to the present application is shown;

[0031] Figure 3 The light wall speaker used in this application is shown;

[0032] Figure 4 The square-circle conversion waveguide of the present application is shown;

[0033] Figure 5a-Figure 5b The partition circular polarizer cavity used in the present application is shown;

[0034] Figure 6 A separator circular polarizer separator according to the present application is shown;

[0035] Figure 7 The parameters of the baffle circular polarizer according to the present application are shown;

[0036] Figure 8 A 90° bent waveguide according to the present application is shown. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described with reference to the accompanying drawings.

[0038] According to the present application, the satellite-borne Q / V band integrated transceiver feed network adopts a multi-segment function-shaped light wall speaker (such as Figure 3 As shown in Figure 1, the performance of a single curved horn is poor and it is difficult to meet the cross-polarization, low standing wave, and high gain performance required by the feed network. The profile of the light wall horn used in this application is composed of two functions. First, the size of the horn input aperture and the horn output aperture is determined, and then the initial function is determined as sin p Connect the Gaussian function and then optimize the function according to the performance requirements.

[0039] According to the baffle circular polarizer (as shown in FIG. 5 ) used in the satellite-borne Q / V band transceiver integrated feed network of the present application, the orthogonal mode coupler and the circular polarizer are combined into one, and the structure is compact, which can realize the conversion of linear polarization waves and circular polarization waves, and can also separate linear polarization waves. The existing baffle circular polarizer has a relatively narrow bandwidth and a low operating frequency (mostly Ka and below frequency bands). The baffle circular polarizer of the present application adopts eight-level gradual steps, which can not only broaden the bandwidth but also enable the circular polarizer to maintain a relatively stable circular polarization performance at a higher frequency.

[0040] like Figure 1 As shown, the satellite-borne Q / V band integrated transceiver feed network according to the present application adopts a curved compact feed arrangement, the horn and the baffle circular polarizer are placed on the same straight line, and the filter is connected to the circular polarizer through a waveguide bent 90° to shorten the lateral length.

[0041] The satellite-borne Q / V band transceiver integrated feed network according to the present application will be described in detail below with reference to specific implementation methods.

[0042] like Figure 1 and Figure 2 As shown, according to one embodiment of the present application, the satellite-borne Q / V band transceiver integrated feed network includes:

[0043] The light wall shaped speaker 1 has a cross section as shown Figure 3 As shown, a two-stage function shaping design is adopted, using sin p The function cascades Gaussian functions to shape the contour of the light wall horn;

[0044] Square-circle conversion waveguide 2, such as Figure 4 As shown;

[0045] The partition circular polarizer 3 is connected to the output end of the light wall shaping speaker 1 through the square-circular conversion waveguide 2, as shown in Figures 5 and Figure 6 As shown (corresponding to Figure 2 The dotted circle part), the partition circular polarizer 3 includes a partition, which is in the form of a multi-step step, combining the functions of the OMT and the circular polarizer into one;

[0046] 90° bend waveguide 4, such as Figure 8 As shown;

[0047] A low-pass filter 5 and a high-pass filter 6 are arranged in parallel and connected to the partition circular polarizer 3 through a 90° bend waveguide 4;

[0048] Among them, Figure 1 As shown, the light wall shaping horn 1 and the partition circular polarizer 3 are arranged on the same straight line, and the low-pass filter 5 and the high-pass filter 6 are connected to the circular polarizer at 90 degrees through the curved waveguide.

[0049] In this embodiment, the light wall shaping speaker adopts a two-stage function shaping design, the input port is a circular waveguide, the radius of the circular waveguide is selected to make the signal work in a single-mode state as much as possible, the main transmission mode of the circular waveguide is the TE11 mode, and for a radius of i For a circular waveguide, according to waveguide theory, its single-mode working area is 2.62a i <λ<3.41a i , thus the radius of the circular waveguide is 0.293λ i <0.486λ, here enter the aperture a i Take 3.1mm. The output radius can be determined based on the gain requirement and beam width. Usually, the initial output aperture is calculated based on an aperture efficiency of 60%.

[0050] The performance of a single curve shaped speaker is difficult to meet the project requirements. The sin p The function cascades Gaussian functions to shape the outline of the light wall speaker and improve its radiation performance. p The function expression is as follows:

[0051]

[0052] The expression of Gaussian function is as follows:

[0053]

[0054] Among them, p = 0.75, a i ​is the radius of the input circular waveguide of the horn, a0 is the output radius of the first sine function (i.e. the input aperture of the Gaussian function); L is the overall length of the horn, where the initial length is 40 mm, L1 is the length of the sine function part, and q is a parameter that determines the output aperture size. Parameters a0, L1, and q can all be optimized according to performance requirements such as directivity, gain, and axial ratio.

[0055] In this embodiment, the partition circular polarizer combines the functions of the OMT and the circular polarizer into one, which can realize the conversion of a single linear polarization wave into a circular polarization wave, and can also realize the separation of a circular polarization wave into a linear polarization wave. In view of the fact that the bandwidth of the partition circular polarizer is generally narrow, the eight-step step transition is adopted here to not only broaden the bandwidth but also enable the circular polarizer to maintain a relatively stable circular polarization performance at a higher frequency. Among them, the specific parameters of the eight-step height (such as Figure 7 As shown) is as follows: h1 = 0.094λ c 、h2=0.142λ c 、h3=0.098λ c 、h4=0.097λ c 、h5=0.089λ c 、h6=0.080λ c 、h7=0.021λ c 、h8=0.041λ c ; The specific parameters of the step length are as follows: l1 = 0.249λ c , l2=0.085λ c , l3=0.066λ c , l4=0.23λ c , l5=0.249, l6=0.265λ c , l7=0.124λ c , l8=0.132λ c , where λ c is the wavelength corresponding to the working center frequency.

[0056] In this embodiment, the curved waveguide is used to achieve the connection between the partition circular polarizer and the filter. Since the lateral length of the antenna is too long, it is not conducive to the miniaturization design of the antenna. The filter is arranged longitudinally through the curved waveguide, which can greatly shorten the lateral length and facilitate the reduction of the lateral length of the reflector antenna.

[0057] To further improve the isolation between transmission and reception, low-pass and high-pass filters are connected behind the curved waveguide. The external interfaces of the filters are all standard waveguide ports, among which the low-pass filter 5 is an eighth-order branch filter, and the external interface is BJ400; the high-pass filter 6 is a ninth-order branch filter, and the external interface is BJ500.

[0058] The main indicators of the satellite-borne Q / V band integrated transceiver feed network provided in this embodiment are as follows:

[0059] Working frequency band: Q band for transmitting frequency band (10% relative bandwidth), V band for receiving frequency band (10% relative bandwidth); standing wave: ≤1.5; gain ≥15dBi; both transmitting and receiving adopt circular polarization, within the range of ±15°, the axial ratio ≤3dB; transmitting and receiving isolation ≥40dB; transmitting frequency band power capacity ≥100W; application scenario: satellite link antenna;

[0060] The above description is only an illustrative embodiment of the present application and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A satellite-borne Q / V band transceiver integrated feed network, comprising: The light wall shaping speaker adopts a two-stage function shaping design; Square-circle conversion waveguide; The partition circular polarizer is connected to the output end of the light wall shaping horn through a square-circle conversion waveguide, and the partition circular polarizer includes a partition, which is in the form of multiple steps; Bend waveguide; The low-pass filter and the high-pass filter are arranged in parallel and connected to the partition circular polarizer through the curved waveguide.

2. The feed network according to claim 1, wherein: Using sin p The contour of the light wall horn is shaped by a function cascade of Gaussian functions.

3. The feed network according to claim 2, wherein: where sin p The function expression is as follows: The expression of Gaussian function is as follows: Among them, p = 0.75, a i is the radius of the input circular waveguide of the horn, a0 is the input aperture of the Gaussian function; L is the overall length of the horn, L1 is the length of the sinusoidal function part, and q is a parameter that determines the output aperture size.

4. The feed network according to claim 1, wherein: The spacer circular polarizer integrates the functions of OMT and circular polarizer.

5. The feed network according to claim 1, wherein: The partition adopts 8 steps.

6. The feed network according to claim 5, wherein: The specific parameters of the 8-step step height are as follows: h1 = 0.094λ c 、h2=0.142λ c 、h3=0.098λ c 、h4=0.097λ c 、h5=0.089λ c 、h6=0.080λ c 、h7=0.021λ c 、h8=0.041λ c , where λ c is the wavelength corresponding to the working center frequency.

7. The feed network according to claim 6, wherein: The specific parameters of the 8-step step length are as follows: l1 = 0.249λ c , l2=0.085λ c , l3=0.066λ c , l4=0.23λ c , l5=0.249, l6=0.265λ c , l7=0.124λ c , l8=0.132λ c , where λ c is the wavelength corresponding to the working center frequency.

8. The feed network according to claim 1, wherein: The bending angle of the curved waveguide is 90°.

9. The feed network according to claim 1, wherein: The input port of the light-wall shaped speaker is a circular waveguide. The radius of the circular waveguide is selected to make the signal work in a single-mode state. The main transmission mode of the circular waveguide is the TE11 mode.

10. The feed network according to claim 1, wherein: The low-pass filter is an eighth-order branch filter, and the high-pass filter 6 is a ninth-order branch filter. The external interfaces are all standard waveguide ports.

Images