A multi-band CTS antenna

Abstract

The invention discloses a multi-band CTS antenna, comprising a feeding network, a multiplexing network and a radiating unit stacked from bottom to top, wherein the feeding network comprises a first metal plate, a second metal plate, four line sources, a first input port, a second input port and a third input port, the multiplexing network comprises a third metal plate and three duplexers, the third duplexer comprises a first low-pass filter, a first band-stop filter and a first E-plane power divider, the second duplexer comprises a second low-pass filter, a second band-stop filter and a second E-plane power divider, the first duplexer comprises a third low-pass filter, a third band-stop filter and a third E-plane power divider, and the radiating unit comprises a fourth metal plate, a fifth metal plate, two one-to-eight power dividers with consistent structures and parameters and sixteen CTS radiating slots with consistent structures and parameters; the antenna has the advantage of being able to cover K-band, Ka-band and Ku-band at the same time, and having high applicability in communication environment.

Description

Technical Field

[0001] The invention relates to a CTS antenna, in particular to a multi-band CTS antenna. Background Art

[0002] CTS (Continuous Transverse Stub) antenna technology was first proposed by Hughes Aircraft Corporation in the United States in the 1990s. Due to its ultra-wideband and high efficiency characteristics, it has been used in various millimeter-wave high-performance antenna applications such as fixed beam, multi-beam and beam scanning. At present, wireless communications are generally developing in the direction of multi-band. The advantage of multi-band is its adaptability and scalability. Due to the large span of the band, more and more antennas need to work at different frequencies on the same platform. For example, when CTS antennas are used for satellite communications, they need to work in the Ku band (12.25-12.75GHz and 14-14.5GHz), K band (17.7-21.2GHz) and Ka band (27.5-31GHz). This inevitably increases the complexity of CTS antenna design and the resulting form factor. Multi-band CTS antennas that can work in multiple bands are often difficult to achieve.

[0003] Document 1 (RSHao, YJCheng and YFWu, "Shared-aperture variable inclination continuous transverse stub antenna working at K-and Ka-band for mobile satellite communication," IEEE Trans.Antennas Propag.) discloses a K / Ka band CTS antenna that can be used in satellite communications. The CTS antenna can cover the K band and the Ka band, but cannot cover the Ku band of satellite communications. However, the current military requires that all satellite vehicle-mounted communication equipment can be used in the Ku band and the Ka band. Therefore, the communication environment applicability of the above CTS antenna still needs to be improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-band CTS antenna which can simultaneously cover the K band, the Ka band and the Ku band and has high applicability in communication environments.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a multi-band CTS antenna, comprising a feeding network, a multiplexing network and a radiating unit stacked in order from bottom to top, wherein the feeding network is used to transmit a TE10 mode and convert the TE10 mode into a quasi-TEM mode and output it to the multiplexing network to activate the multiplexing network; the multiplexing network is used to transmit the quasi-TEM mode transmitted thereto to the radiating unit; the radiating unit is used to radiate the quasi-TEM mode transmitted thereto by the multiplexing network to free space;

[0006] The feeding network includes a first metal plate, a second metal plate, four line sources, a first input port, a second input port and a third input port, the four line sources are respectively referred to as the first line source, the second line source, the third line source and the fourth line source, the second metal plate is located above the first metal plate, the first input port, the first line source and the second line source are respectively arranged on the first metal plate, the second input port, the third input port, the third line source and the fourth line source are respectively arranged on the second metal plate, the first line source and the second line source have one input port and eight output ports respectively, the third line source and the fourth line source have one input port and eight output ports respectively, The line sources each have an input port and sixteen output ports, the first input port of the feed network serves as a common input port, and is respectively connected to the input port of the first line source and the input port of the second line source, the input port of the third line source is connected to the second input port of the feed network, the input port of the fourth line source is connected to the third input port of the feed network, the first line source and the second line source are both implemented by a one-to-eight ridged waveguide power divider having an input port and eight output ports, and the input port of the one-to-eight ridged waveguide power divider serves as the input port of the first line source or the second line source, and the eight ridged waveguide power dividers of the one-to-eight ridged waveguide power divider are connected to the input port of the first line source or the second line source. The output ports serve as eight output ports of the first line source or the second line source, the third line source and the fourth line source are both implemented by a one-to-sixteen ridge waveguide power divider with one input port and sixteen output ports, and the input port of the one-to-sixteen ridge waveguide power divider serves as the input port of the third line source or the fourth line source, the sixteen output ports of the one-to-sixteen ridge waveguide power divider serve as the sixteen output ports of the first line source or the second line source, the first input port of the feeding network is used to feed a Ku-band excitation signal, the second input port of the feeding network is used to feed a K-band excitation signal, and the third input port of the feeding network is used to feed Ka-band excitation signal, when the first input port of the feeding network is fed with a Ku-band excitation signal, the first line source can generate a Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into a Ku-band quasi-TEM mode output at its eight output ports, the second line source can generate a Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into a Ku-band quasi-TEM mode for output at its eight output ports;When the second input port of the feeding network is fed with a K-band excitation signal, the third line source can generate a K-band TE10 mode under the excitation of the K-band excitation signal, and the generated K-band TE10 mode is equally transmitted to its sixteen output ports after power distribution, and finally coupled into a K-band quasi-TEM mode output at its sixteen output ports; when the third input port of the feeding network is fed with a Ka-band excitation signal, the fourth line source can generate a Ka-band TE10 mode under the condition of the Ka-band excitation signal, and the generated Ka-band TE10 mode is equally transmitted to its sixteen output ports after power distribution, and finally coupled into a Ka-band quasi-T at its sixteen output ports. EM mode output; the multiplexing network includes a third metal plate and three duplexers arranged on the third metal plate, the three duplexers are respectively referred to as a first duplexer, a second duplexer and a third duplexer, each of the three duplexers has a first input port, a second input port and an output port, the third metal plate is located above the second metal plate, the third duplexer is located below the first duplexer and the second duplexer, the first duplexer and the second duplexer are arranged in parallel and spaced apart in a transverse manner, the first duplexer and the second duplexer are axially symmetrically distributed about the central axis of the third metal plate, and the design parameters of the two are consistent; the third duplexer The device comprises a first low-pass filter, a first band-stop filter and a first E-plane power divider, wherein the first E-plane power divider has a first input port, a second input port and an output port, and both the first low-pass filter and the first band-stop filter have an input port and an output port; the input port of the first low-pass filter serves as the first input port of the third duplexer, connected to the sixteen output ports of the third line source, and the output port of the first low-pass filter is connected to the first input port of the first E-plane power divider; the input port of the first band-stop filter serves as the second input port of the third duplexer, connected to the sixteen output ports of the fourth line source, and the first band-stop filter The output port of the third duplexer is connected to the second input port of the first E-plane power divider; the output port of the first E-plane power divider serves as the output port of the third duplexer; the first low-pass filter can allow the quasi-TEM mode of the K band to pass through and block the quasi-TEM mode of the Ka band, and the first band-stop filter can allow the quasi-TEM mode of the Ka band to pass through and block the quasi-TEM mode of the K band; the second duplexer comprises a second low-pass filter, a second band-stop filter and a second E-plane power divider, the second E-plane power divider has a first input port, a second input port and an output port, and the second low-pass filter and the second band-stop filter both have an input port and an output port;The input port of the second low-pass filter serves as the first input port of the second duplexer, connected to the eight output ports of the second line source, and the output port of the second low-pass filter is connected to the first input port of the second E-plane power divider; the input port of the second band-stop filter serves as the second input port of the second duplexer, connected to the output port of the third duplexer, and the output port of the second band-stop filter is connected to the second input port of the second E-plane power divider; the output port of the second E-plane power divider serves as the output port of the second duplexer; the second low-pass filter can allow the quasi-TEM mode of the Ku band to pass through, and block the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band from passing through, and the second band-stop filter can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and block the quasi-TEM mode of the Ku band from passing through; the first duplexer includes a third low-pass filter, a third band-stop filter and a third E-plane power divider, and the third E-plane power divider has a first input port, a second input port and an output port, and the third low-pass filter The device and the third band-stop filter both have an input port and an output port; the input port of the third low-pass filter serves as the first input port of the first duplexer, connected to the eight output ports of the first line source, and the output port of the third low-pass filter is connected to the first input port of the third E-plane power divider; the input port of the third band-stop filter serves as the second input port of the first duplexer, connected to the output port of the third duplexer, and the output port of the third band-stop filter is connected to the second input port of the third E-plane power divider; the output port of the third E-plane power divider serves as the output port of the first duplexer; the third low-pass filter can allow the quasi-TEM mode of the Ku band to pass through, and block the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band from passing through, and the third band-stop filter can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and block the quasi-TEM mode of the Ku band from passing through; the first low-pass filter, the second low-pass filter and the third low-pass filter are all implemented by parallel plate waveguide filters with Chebyshev response;When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source generate a Ku-band quasi-TEM mode output, the third line source generates a K-band quasi-TEM mode output, and the fourth line source generates a Ka-band quasi-TEM mode output. At this time, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode, the K-band quasi-TEM mode, and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode, the K-band quasi-TEM mode, and the Ka-band quasi-TEM mode;

[0007] When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate a Ku-band quasi-TEM mode, the third line source and the fourth line source do not work, and at this time, the output port of the first E-plane power divider will not output a signal to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a Ku-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a Ku-band quasi-TEM mode; when the feeding When the first input port of the power network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the third line source generates a K-band quasi-TEM mode, the first line source, the second line source, and the fourth line source do not work, at which time the output port of the first E-plane power divider outputs a K-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a K-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a K-band quasi-TEM mode; when the first input port of the feeding network When the input port of the feeding network is not fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the fourth line source generates a quasi-TEM mode in the Ka-band, and the first line source, the second line source, and the third line source do not work. At this time, the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka-band and outputs it to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka-band, and the output port of the second E-plane power divider outputs a quasi-TEM mode in the Ka-band; when the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third line source is fed with a Ka-band excitation signal. When the first input port is fed with a K-band excitation signal and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate Ku-band quasi-TEM mode outputs, the third line source generates a K-band quasi-TEM mode output, and the fourth line source does not work. At this time, the output port of the first E-plane power divider outputs the K-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode;When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source generate a Ku-band quasi-TEM mode output, the fourth line source generates a Ka-band quasi-TEM mode output, and the third line source does not work. At this time, the output port of the first E-plane power divider outputs the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the Ka-band quasi-TEM mode; when the feeding network When the first input port of the network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source do not work, the third line source generates a K-band quasi-TEM mode output, and the fourth line source generates a Ka-band quasi-TEM mode output. At this time, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode;

[0008] The radiation unit includes a fourth metal plate, a fifth metal plate, two one-to-eight power dividers with the same structure and parameters arranged on the fourth metal plate, and sixteen CTS radiation slots with the same structure and parameters arranged on the fifth metal plate, the fifth metal plate is located above the fourth metal plate, the fourth metal plate is located above the third metal plate, the two one-to-eight power dividers are called the first one-to-eight power divider and the second one-to-eight power divider, each of the one-to-eight power dividers has eight output ports and one input port, the sixteen CTS radiation slots are connected to the first The eight output ports of the one-to-eight power splitter and the eight output ports of the second one-to-eight power splitter are connected one by one, the input port of the first one-to-eight power splitter is connected to the output port of the first duplexer, and the input port of the second one-to-eight power splitter is connected to the output port of the second duplexer, and the 16 CTS radiation slots are evenly spaced in a sequence from front to back, and the spacing between two adjacent CTS radiation slots is less than the free space wavelength of the maximum operating frequency of the multi-band CTS antenna in the three bands of K band, Ka band and Ku band, so as to achieve Grating lobes are suppressed in all bands, and a stepped Chebyshev transformer is arranged in each of the CTS radiation slots to ensure a wide impedance bandwidth between the output of each one-to-eight power divider and the free space; the input port of the first one-to-eight power divider is used to receive the quasi-TEM mode of the Ku / K / Ka band output by the output port of the first duplexer, and then transmit it equally to its eight output ports after power distribution; the eight output ports of the first one-to-eight power divider are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots connected thereto, and the eight The CTS radiation slots are used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto, the input port of the second one-to-eight power splitter is used to receive the quasi-TEM mode of the Ku / K / Ka band outputted by the output port of the second duplexer, and then transmit it equally to its eight output ports after power distribution, the eight output ports of the second one-to-eight power splitter are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots connected thereto, and the eight CTS radiation slots are used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto.

[0009] Compared with the prior art, the advantages of the present invention are that a feeding network is formed by a first metal plate, a second metal plate, four line sources, a first input port, a second input port and a third input port, the four line sources are respectively referred to as a first line source, a second line source, a third line source and a fourth line source, a multiplexing network is formed by a third metal plate and three duplexers arranged on the third metal plate, the three duplexers are respectively referred to as a first duplexer, a second duplexer and a third duplexer, the third duplexer includes a first low-pass filter, a first band-stop filter and a first E-plane power divider, the second duplexer includes a second low-pass filter, a second band-stop filter and a second E-plane power divider, the first The duplexer includes a third low-pass filter, a third band-stop filter and a third E-plane power divider, and a radiation unit is formed by a fourth metal plate, a fifth metal plate, two one-to-eight power dividers with the same structure and parameters arranged on the fourth metal plate, and sixteen CTS radiation slots with the same structure and parameters arranged on the fifth metal plate. When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate a Ku-band quasi-TEM mode, the third line source and the fourth line source do not work, and at this time, the output port of the first E-plane power divider will not output a signal to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs the quasi-TEM mode of the Ku band, and the output port of the second E-plane power divider outputs the quasi-TEM mode of the Ku band; when the first input port of the feeding network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the third line source generates a quasi-TEM mode of the K band, and the first line source, the second line source and the fourth line source do not work. At this time, the output port of the first E-plane power divider outputs the quasi-TEM mode of the K band and outputs it to the third band-stop filter and the second band-stop filter, and the output port of the third E-plane power divider outputs the K-band The output port of the second E-plane power divider outputs a quasi-TEM mode in the K band; when the first input port of the feeding network is not fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the fourth line source generates a quasi-TEM mode in the Ka band, the first line source, the second line source, and the third line source do not work, at which time the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka band and outputs it to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka band, and the output port of the second E-plane power divider outputs a quasi-TEM mode in the Ka band;When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate Ku-band quasi-TEM mode outputs, the third line source generates K-band quasi-TEM mode outputs, and the fourth line source does not work. At this time, the output port of the first E-plane power divider outputs the K-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode; when When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source generate a quasi-TEM mode output in the Ku-band, the fourth line source generates a quasi-TEM mode output in the Ka-band, and the third line source does not work. At this time, the output port of the first E-plane power divider outputs the quasi-TEM mode in the Ka-band to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the quasi-TEM mode in the Ku-band and the quasi-TEM mode in the Ka-band, and the output port of the second E-plane power divider outputs a mixed signal of the quasi-TEM mode in the Ku-band and the quasi-TEM mode in the Ka-band;When the first input port of the feeding network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source do not work, the third line source generates a quasi-TEM mode output of the K-band, and the fourth line source generates a quasi-TEM mode output of the Ka-band. At this time, the output port of the first E-plane power divider outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band, the output port of the second E-plane power divider outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band, the input port of the first one-to-eight power divider receives the quasi-TEM mode of the Ku / K / Ka-band outputted by the output port of the first duplexer, and then transmits it equally to its eight output ports after power distribution. The eight output ports of the first one-to-eight power divider transmit the quasi-TEM mode of the Ku / K / Ka-band to them. The TEM mode is fed to the eight CTS radiation slots connected thereto, and the eight CTS radiation slots radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto, and the input port of the second one-to-eight power splitter receives the quasi-TEM mode of the Ku / K / Ka band outputted by the output port of the second duplexer, and then transmits it equally to its eight output ports after power distribution, and the eight output ports of the second one-to-eight power splitter feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots connected thereto, and the eight CTS radiation slots radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto, and the overall structure of the present invention is based on air waveguide, which can maximize the gain and efficiency, and can cover the K band, Ka band and Ku band at the same time, and has high applicability in communication environment, and the simulation verification results show that the present invention can be applied to the following three bands: 11.25-15GHz (Ku band), 17.7-22GHz (K band), and 27.5-32GHz (Ka band). ; BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of a feeding network of a multi-band CTS antenna of the present invention;

[0011] Figure 2 A cross-sectional view of a multiplexing network of a multi-band CTS antenna of the present invention;

[0012] Figure 3 It is a schematic structural diagram of a radiation unit of a multi-band CTS antenna of the present invention;

[0013] Figure 4 It is a simulation curve and an actual measurement curve diagram of the reflection coefficient of the multi-band CTS antenna of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below with reference to the accompanying drawings.

[0015] Embodiment: A multi-band CTS antenna comprises a feeding network, a multiplexing network and a radiating unit stacked in order from bottom to top, wherein the feeding network is used to transmit a TE10 mode and convert the TE10 mode into a quasi-TEM mode and output it to the multiplexing network to activate the multiplexing network; the multiplexing network is used to transmit the quasi-TEM mode transmitted thereto to the radiating unit; Figure 1As shown, the radiation unit is used to radiate the quasi-TEM mode transmitted to it by the multiplexing network to the free space; the feeding network includes a first metal plate 1, a second metal plate 2, four line sources, a first input port 3, a second input port 4 and a third input port 5, the four line sources are respectively called a first line source 6, a second line source 7, a third line source 8 and a fourth line source 9, the second metal plate 2 is located above the first metal plate 1, the first input port 3, the first line source 6 and the second line source 7 are respectively arranged on the first metal plate 1, the second input port 4, the third input port 5, the third line source 8 and the fourth line source 9 are respectively arranged on the second metal plate 2, and the first line source 6 and the second line source 7 have a The first line source 6 and the second line source 7 are connected to each other through a one-to-eight ridge waveguide power divider. The first line source 6 and the second line source 7 are connected to each other through a one-to-eight ridge waveguide power divider. The first line source 6 and the second line source 7 are connected to each other through a one-to-eight ridge waveguide power divider. The first line source 6 and the second line source 7 are connected to each other through a one-to-eight ridge waveguide power divider. The first line source 6 and the second line source 7 are connected to each other through a one-to-eight ridge waveguide power divider. The first line source 6 and the second line source 7 are both implemented by a one-to-eight ridge waveguide power divider having one input port and eight output ports. The input port of the one-to-eight ridge waveguide power divider is used as the input port of the first line source 6 or the second line source 7. The eight output ports of the eight-ridge waveguide power divider are used as the eight output ports of the first line source 6 or the second line source 7. The third line source 8 and the fourth line source 9 are both implemented by a one-to-sixteen-ridge waveguide power divider with one input port and sixteen output ports, and the input port of the one-to-sixteen-ridge waveguide power divider is used as the input port of the third line source 8 or the fourth line source 9, and the sixteen output ports of the one-to-sixteen-ridge waveguide power divider are used as the sixteen output ports of the first line source 6 or the second line source 7. The first input port 3 of the feeding network is used to feed the Ku-band excitation signal, the second input port 4 of the feeding network is used to feed the K-band excitation signal, and the third input port 5 of the feeding network is used to feed the Ka-band excitation signal. segment excitation signal, when the first input port 3 of the feeding network is fed with the Ku-band excitation signal, the first line source 6 can generate the Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into the Ku-band quasi-TEM mode output at its eight output ports, the second line source 7 can generate the Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into the Ku-band quasi-TEM mode for output at its eight output ports;When a K-band excitation signal is fed into the second input port 4 of the feeding network, the third line source 8 can generate a K-band TE10 mode under the excitation of the K-band excitation signal, and transmit the generated K-band TE10 mode to its sixteen output ports in equal parts after power distribution, and finally couple into a K-band quasi-TEM mode output at its sixteen output ports; when a Ka-band excitation signal is fed into the third input port 5 of the feeding network, the fourth line source 9 can generate a Ka-band TE10 mode under the condition of the Ka-band excitation signal, and transmit the generated Ka-band TE10 mode to its sixteen output ports in equal parts after power distribution, and finally couple into a Ka-band quasi-TEM mode output at its sixteen output ports;

[0016] like Figure 2As shown, the multiplexing network includes a third metal plate 19 and three duplexers arranged on the third metal plate 19, the three duplexers are respectively called a first duplexer, a second duplexer and a third duplexer, each of the three duplexers has a first input port 3, a second input port 4 and an output port, the third metal plate 19 is located above the second metal plate 2, the third duplexer is located below the first duplexer and the second duplexer, the first duplexer and the second duplexer are arranged in parallel and spaced apart in a horizontal direction, the first duplexer and the second duplexer are axially symmetrically distributed about the central axis of the third metal plate 19, and the design parameters of the two are consistent; the third duplexer includes a first low-pass filter 10, a first band-stop filter 11 and a first E-plane power divider 12, the third An E-plane power divider 12 has a first input port 3, a second input port 4 and an output port, and the first low-pass filter 10 and the first band-stop filter 11 both have an input port and an output port; the input port of the first low-pass filter 10 serves as the first input port 3 of the third duplexer, connected to the sixteen output ports of the third line source 8, and the output port of the first low-pass filter 10 is connected to the first input port 3 of the first E-plane power divider 12; the input port of the first band-stop filter 11 serves as the second input port 4 of the third duplexer, connected to the sixteen output ports of the fourth line source 9, and the output port of the first band-stop filter 11 is connected to the second input port 4 of the first E-plane power divider 12; the output port of the first E-plane power divider 12 serves as The output port of the third duplexer; the first low-pass filter 10 can allow the quasi-TEM mode of the K band to pass through and block the quasi-TEM mode of the Ka band; the first band-stop filter 11 can allow the quasi-TEM mode of the Ka band to pass through and block the quasi-TEM mode of the K band; the second duplexer includes a second low-pass filter 13, a second band-stop filter 14 and a second E-plane power divider 15, the second E-plane power divider 15 has a first input port 3, a second input port 4 and an output port, the second low-pass filter 13 and the second band-stop filter 14 both have an input port and an output port; the input port of the second low-pass filter 13 serves as the first input port 3 of the second duplexer, and is connected to the eight output ports of the second line source 7 , the output port of the second low-pass filter 13 is connected to the first input port 3 of the second E-plane power divider 15; the input port of the second band-stop filter 14 serves as the second input port 4 of the second duplexer, connected to the output port of the third duplexer, and the output port of the second band-stop filter 14 is connected to the second input port 4 of the second E-plane power divider 15; the output port of the second E-plane power divider 15 serves as the output port of the second duplexer; the second low-pass filter 13 can allow the quasi-TEM mode of the Ku band to pass through, and block the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band from passing through, and the second band-stop filter 14 can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and block the quasi-TEM mode of the Ku band from passing through;The first duplexer includes a third low-pass filter 16, a third band-stop filter 17 and a third E-plane power divider 18. The third E-plane power divider 18 has a first input port 3, a second input port 4 and an output port. The third low-pass filter 16 and the third band-stop filter 17 both have an input port and an output port. The input port of the third low-pass filter 16 serves as the first input port 3 of the first duplexer and is connected to the eight output ports of the first line source 6. The output port of the third low-pass filter 16 is connected to the first input port 3 of the third E-plane power divider 18. ; The input port of the third band-stop filter 17 serves as the second input port 4 of the first duplexer, connected to the output port of the third duplexer, and the output port of the third band-stop filter 17 is connected to the second input port 4 of the third E-plane power divider 18; the output port of the third E-plane power divider 18 serves as the output port of the first duplexer; the third low-pass filter 16 can allow the quasi-TEM mode of the Ku band to pass through, and block the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band from passing through, and the third band-stop filter 17 can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through. The quasi-TEM mode passes through and the quasi-TEM mode of the Ku band is blocked; the first low-pass filter 10, the second low-pass filter 13 and the third low-pass filter 16 are all implemented by parallel plate waveguide filters with Chebyshev response; when the first input port 3 of the feeding network is fed with a Ku-band excitation signal, the second input port 4 is fed with a K-band excitation signal, and the third input port 5 is fed with a Ka-band signal, the first line source 6 and the second line source 7 generate a quasi-TEM mode output of the Ku band, the third line source 8 generates a quasi-TEM mode output of the K band, and the fourth line source 9 generates The quasi-TEM mode of the Ka band is output, at this time, the output port of the first E-plane power divider 12 outputs a mixed signal of the quasi-TEM mode of the K band and the quasi-TEM mode of the Ka band to the third band-stop filter 17 and the second band-stop filter 14, the output port of the third E-plane power divider 18 outputs a mixed signal of the quasi-TEM mode of the Ku band, the quasi-TEM mode of the K band and the quasi-TEM mode of the Ka band, and the output port of the second E-plane power divider 15 outputs a mixed signal of the quasi-TEM mode of the Ku band, the quasi-TEM mode of the K band and the quasi-TEM mode of the Ka band;

[0017] When the first input port 3 of the feeding network is fed with a Ku-band excitation signal, the second input port 4 is not fed with a K-band excitation signal, and the third input port 5 is not fed with a Ka-band signal, the first line source 6 and the second line source 7 respectively generate a quasi-TEM mode in the Ku band, and the third line source 8 and the fourth line source 9 do not work. At this time, the output port of the first E-plane power divider 12 will not output a signal to the third band-stop filter 17 and the second band-stop filter 14, the output port of the third E-plane power divider 18 outputs a quasi-TEM mode in the Ku band, and the output port of the second E-plane power divider 15 outputs a quasi-TEM mode in the Ku band; when the first input port 3 of the feeding network is not When a Ku-band excitation signal is fed, a K-band excitation signal is fed to the second input port 4, and a Ka-band signal is not fed to the third input port 5, the third line source 8 generates a K-band quasi-TEM mode, and the first line source 6, the second line source 7, and the fourth line source 9 do not work. At this time, the output port of the first E-plane power divider 12 outputs the K-band quasi-TEM mode to the third band-stop filter 17 and the second band-stop filter 14, the output port of the third E-plane power divider 18 outputs the K-band quasi-TEM mode, and the output port of the second E-plane power divider 15 outputs the K-band quasi-TEM mode; when the first input port 3 of the feeding network is not fed with a Ku-band excitation signal, the first line source 6, the second line source 7, and the fourth line source 9 do not work. When the second input port 4 is not fed with a K-band excitation signal and the third input port 5 is fed with a Ka-band signal, the fourth line source 9 generates a quasi-TEM mode in the Ka-band, and the first line source 6, the second line source 7, and the third line source 8 do not work. At this time, the output port of the first E-plane power divider 12 outputs the quasi-TEM mode in the Ka-band and outputs it to the third band-stop filter 17 and the second band-stop filter 14. The output port of the first E-plane power divider 12 outputs the quasi-TEM mode in the Ka-band, and the output port of the second E-plane power divider 15 outputs the quasi-TEM mode in the Ka-band. When the first input port 3 of the feeding network is fed with a Ku-band excitation signal and the second input port 4 is fed with a K-band excitation signal, When the Ka-band excitation signal is input and the third input port 5 is not fed with a Ka-band signal, the first line source 6 and the second line source 7 respectively generate Ku-band quasi-TEM mode outputs, the third line source 8 generates K-band quasi-TEM mode outputs, and the fourth line source 9 does not work. At this time, the output port of the first E-plane power divider 12 outputs the K-band quasi-TEM mode to the third band-stop filter 17 and the second band-stop filter 14, and the output port of the first E-plane power divider 12 outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode, and the output port of the second E-plane power divider 15 outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode;When the first input port 3 of the feeding network is fed with a Ku-band excitation signal, the second input port 4 is not fed with a K-band excitation signal, and the third input port 5 is fed with a Ka-band signal, the first line source 6 and the second line source 7 generate a quasi-TEM mode output in the Ku-band, the fourth line source 9 generates a quasi-TEM mode output in the Ka-band, and the third line source 8 does not work. At this time, the output port of the first E-plane power divider 12 outputs the quasi-TEM mode in the Ka-band to the third band-stop filter 17 and the second band-stop filter 14, the output port of the first E-plane power divider 12 outputs a mixed signal of the quasi-TEM mode in the Ku-band and the quasi-TEM mode in the Ka-band, and the output port of the second E-plane power divider 15 outputs a mixed signal of the quasi-TEM mode in the Ku-band and the quasi-TEM mode in the Ka-band; when the feeding network When the first input port 3 is not fed with a Ku-band excitation signal, the second input port 4 is fed with a K-band excitation signal, and the third input port 5 is fed with a Ka-band signal, the first line source 6 and the second line source 7 do not work, the third line source 8 generates a quasi-TEM mode output of the K-band, and the fourth line source 9 generates a quasi-TEM mode output of the Ka-band. At this time, the output port of the first E-plane power divider 12 outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band to the third band-stop filter 17 and the second band-stop filter 14, the output port of the first E-plane power divider 12 outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band, and the output port of the second E-plane power divider 15 outputs a mixed signal of the quasi-TEM mode of the K-band and the quasi-TEM mode of the Ka-band;

[0018] like Figure 3As shown, the radiation unit includes a fourth metal plate 20, a fifth metal plate 21, two one-to-eight power dividers with the same structure and parameters arranged on the fourth metal plate 20, and sixteen CTS radiation slots 22 with the same structure and parameters arranged on the fifth metal plate 21. The fifth metal plate 21 is located above the fourth metal plate 20, and the fourth metal plate 20 is located above the third metal plate 19. The two one-to-eight power dividers are called the first one-to-eight power divider 23 and the second one-to-eight power divider 24. Each one-to-eight power divider has eight output ports and one input port. The sixteen CTS radiation slots 22 are connected to the first one-to-eight power divider 23 and the second one-to-eight power divider 24. The eight output ports of the eight-way power splitter 23 and the eight output ports of the second one-way power splitter 24 are connected one by one, the input port of the first one-way power splitter 23 is connected to the output port of the first duplexer, and the input port of the second one-way power splitter 24 is connected to the output port of the second duplexer. The 16 CTS radiation slots 22 are evenly spaced in a sequence from front to back, and the spacing between two adjacent CTS radiation slots 22 is less than the free space wavelength of the maximum operating frequency of the multi-band CTS antenna in the three bands of K band, Ka band and Ku band, so as to achieve light suppression in all bands. Grating lobe, each CTS radiation slot 22 is provided with a stepped Chebyshev transformer to ensure a wide impedance bandwidth between the output of each one-to-eight power divider and the free space; the input port of the first one-to-eight power divider 23 is used to receive the quasi-TEM mode of the Ku / K / Ka band outputted from the output port of the first duplexer, and then transmit it equally to its eight output ports after power distribution, and the eight output ports of the first one-to-eight power divider 23 are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots 22 connected thereto, and the eight CTS radiation slots 2 2 is used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto, the input port of the second one-to-eight power divider 24 is used to receive the quasi-TEM mode of the Ku / K / Ka band outputted by the output port of the second duplexer, and then transmit it equally to its eight output ports after power distribution, the eight output ports of the second one-to-eight power divider 24 are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots 22 connected thereto, and the eight CTS radiation slots 22 are used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto.

[0019] In order to verify the performance of the multi-band CTS antenna of the present invention, the reflection coefficient of the multi-band CTS antenna of the present invention is simulated and actually measured under the condition that the first input port is fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is fed with a Ka-band excitation signal. The simulation is based on Ansoft HFSS software. The simulation curve and the actual measurement curve of the reflection coefficient of the multi-band CTS antenna of the present invention are shown in FIG. Figure 4 Analysis Figure 4 We know that the simulated and actually measured reflection coefficients of the Ku-band, K-band and Ka-band are all less than -12 dB, and the multi-band CTS antenna of the present invention can effectively propagate in the three bands of Ku-band, K-band and Ka-band.

Claims

1. A multi-band CTS antenna, comprising a feeding network, a multiplexing network and a radiating unit stacked in order from bottom to top, wherein the feeding network is used to transmit a TE10 mode and convert the TE10 mode into a quasi-TEM mode and output it to the multiplexing network to activate the multiplexing network; the multiplexing network is used to transmit the quasi-TEM mode transmitted thereto to the radiating unit; the radiating unit is used to radiate the quasi-TEM mode transmitted thereto by the multiplexing network into free space; Features The feeding network includes a first metal plate, a second metal plate, four line sources, a first input port, a second input port and a third input port, the four line sources are respectively referred to as the first line source, the second line source, the third line source and the fourth line source, the second metal plate is located above the first metal plate, the first input port, the first line source and the second line source are respectively arranged on the first metal plate, the second input port, the third input port, the third line source and the fourth line source are respectively arranged on the second metal plate, the first line source and the second line source have one input port and eight output ports respectively, the third line source and the fourth line source have one input port and eight output ports respectively, The line sources each have an input port and sixteen output ports, the first input port of the feed network serves as a common input port, and is respectively connected to the input port of the first line source and the input port of the second line source, the input port of the third line source is connected to the second input port of the feed network, the input port of the fourth line source is connected to the third input port of the feed network, the first line source and the second line source are both implemented by a one-to-eight ridged waveguide power divider having an input port and eight output ports, and the input port of the one-to-eight ridged waveguide power divider serves as the input port of the first line source or the second line source, and the eight ridged waveguide power dividers of the one-to-eight ridged waveguide power divider are connected to the input port of the first line source or the second line source. The output ports serve as eight output ports of the first line source or the second line source, the third line source and the fourth line source are both implemented by a one-to-sixteen ridge waveguide power divider with one input port and sixteen output ports, and the input port of the one-to-sixteen ridge waveguide power divider serves as the input port of the third line source or the fourth line source, the sixteen output ports of the one-to-sixteen ridge waveguide power divider serve as the sixteen output ports of the first line source or the second line source, the first input port of the feeding network is used to feed a Ku-band excitation signal, the second input port of the feeding network is used to feed a K-band excitation signal, and the third input port of the feeding network is used to feed Ka-band excitation signal, when the first input port of the feeding network is fed with a Ku-band excitation signal, the first line source can generate a Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into a Ku-band quasi-TEM mode output at its eight output ports, the second line source can generate a Ku-band TE10 mode under the excitation of the Ku-band excitation signal, and the generated Ku-band TE10 mode is equally transmitted to its eight output ports after power distribution, and finally coupled into a Ku-band quasi-TEM mode for output at its eight output ports;When the second input port of the feeding network is fed with a K-band excitation signal, the third line source can generate a K-band TE10 mode under the excitation of the K-band excitation signal, and transmit the generated K-band TE10 mode to its sixteen output ports in equal parts after power distribution, and finally couple into a K-band quasi-TEM mode output at its sixteen output ports; when the third input port of the feeding network is fed with a Ka-band excitation signal, the fourth line source can generate a Ka-band TE10 mode under the condition of the Ka-band excitation signal, and transmit the generated Ka-band TE10 mode to its sixteen output ports in equal parts after power distribution, and finally couple into a Ka-band quasi-TEM mode output at its sixteen output ports. The multiplexing network comprises a third metal plate and three duplexers arranged on the third metal plate, the three duplexers are respectively referred to as a first duplexer, a second duplexer and a third duplexer, each of the duplexers has a first input port, a second input port and an output port, the third metal plate is located above the second metal plate, the third duplexer is located below the first duplexer and the second duplexer, the first duplexer and the second duplexer are arranged in parallel and spaced apart in a transverse direction, the first duplexer and the second duplexer are axially symmetrically distributed about the central axis of the third metal plate, and the design parameters of the two are consistent; The third duplexer comprises a first low-pass filter, a first band-stop filter and a first E-plane power divider, the first E-plane power divider has a first input port, a second input port and an output port, the first low-pass filter and the first band-stop filter both have an input port and an output port; the input port of the first low-pass filter serves as the first input port of the third duplexer, connected to the sixteen output ports of the third line source, the output port of the first low-pass filter is connected to the first input port of the first E-plane power divider; the input port of the first band-stop filter serves as the second input port of the third duplexer, connected to the sixteen output ports of the fourth line source, the first The output port of the band-stop filter is connected to the second input port of the first E-plane power divider; the output port of the first E-plane power divider serves as the output port of the third duplexer; the first low-pass filter can allow the quasi-TEM mode of the K band to pass through and block the quasi-TEM mode of the Ka band from passing through, and the first band-stop filter can allow the quasi-TEM mode of the Ka band to pass through and block the quasi-TEM mode of the K band from passing through; the second duplexer comprises a second low-pass filter, a second band-stop filter and a second E-plane power divider, the second E-plane power divider has a first input port, a second input port and an output port, and the second low-pass filter and the second band-stop filter both have an input port and an output port; The input port of the second low-pass filter serves as the first input port of the second duplexer, connected to the eight output ports of the second line source, and the output port of the second low-pass filter is connected to the first input port of the second E-plane power divider; the input port of the second band-stop filter serves as the second input port of the second duplexer, connected to the output port of the third duplexer, and the output port of the second band-stop filter is connected to the second input port of the second E-plane power divider; the output port of the second E-plane power divider serves as the output port of the second duplexer; the second low-pass filter can allow the quasi-TEM mode of the Ku band to pass through, and block the quasi-TEM mode of the K band or the quasi-T mode of the Ka band. The EM mode passes through, the second band-stop filter can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and block the quasi-TEM mode of the Ku band from passing through; the first duplexer comprises a third low-pass filter, a third band-stop filter and a third E-plane power divider, the third E-plane power divider has a first input port, a second input port and an output port, the third low-pass filter and the third band-stop filter both have an input port and an output port; the input port of the third low-pass filter serves as the first input port of the first duplexer, connected to the eight output ports of the first line source, and the output port of the third low-pass filter is connected to the first input port of the third E-plane power divider;The input port of the third band-stop filter serves as the second input port of the first duplexer, connected to the output port of the third duplexer, and the output port of the third band-stop filter is connected to the second input port of the third E-plane power divider; the output port of the third E-plane power divider serves as the output port of the first duplexer; the third low-pass filter can allow the quasi-TEM mode of the Ku band to pass through, block the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and the third band-stop filter can allow the quasi-TEM mode of the K band or the quasi-TEM mode of the Ka band to pass through, and block the quasi-TEM mode of the Ku band to pass through; the first low-pass filter, the second low-pass filter and the third low-pass filter are all implemented by a parallel plate waveguide filter with a Chebyshev response; when the first input port of the feeding network is fed with When a Ku-band excitation signal is input, a K-band excitation signal is fed into the second input port, and a Ka-band signal is fed into the third input port, the first line source and the second line source generate a Ku-band quasi-TEM mode output, the third line source generates a K-band quasi-TEM mode output, and the fourth line source generates a Ka-band quasi-TEM mode output. At this time, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode, the K-band quasi-TEM mode, and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode, the K-band quasi-TEM mode, and the Ka-band quasi-TEM mode; When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate a Ku-band quasi-TEM mode, the third line source and the fourth line source do not work, and at this time, the output port of the first E-plane power divider will not output a signal to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a Ku-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a Ku-band quasi-TEM mode; when the feeding When the first input port of the power network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is not fed with a Ka-band signal, the third line source generates a K-band quasi-TEM mode, the first line source, the second line source, and the fourth line source do not work, at which time the output port of the first E-plane power divider outputs a K-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the third E-plane power divider outputs a K-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a K-band quasi-TEM mode; when the first input port of the feeding network When the input port of the feeding network is not fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the fourth line source generates a quasi-TEM mode in the Ka-band, and the first line source, the second line source, and the third line source do not work. At this time, the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka-band and outputs it to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a quasi-TEM mode in the Ka-band, and the output port of the second E-plane power divider outputs a quasi-TEM mode in the Ka-band; when the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third line source is fed with a Ka-band excitation signal. When the first input port is fed with a K-band excitation signal and the third input port is not fed with a Ka-band signal, the first line source and the second line source respectively generate Ku-band quasi-TEM mode outputs, the third line source generates a K-band quasi-TEM mode output, and the fourth line source does not work. At this time, the output port of the first E-plane power divider outputs the K-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the K-band quasi-TEM mode;When the first input port of the feeding network is fed with a Ku-band excitation signal, the second input port is not fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source generate a Ku-band quasi-TEM mode output, the fourth line source generates a Ka-band quasi-TEM mode output, and the third line source does not work. At this time, the output port of the first E-plane power divider outputs the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the Ku-band quasi-TEM mode and the Ka-band quasi-TEM mode; when the feeding network When the first input port of the network is not fed with a Ku-band excitation signal, the second input port is fed with a K-band excitation signal, and the third input port is fed with a Ka-band signal, the first line source and the second line source do not work, the third line source generates a K-band quasi-TEM mode output, and the fourth line source generates a Ka-band quasi-TEM mode output. At this time, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode to the third band-stop filter and the second band-stop filter, the output port of the first E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode, and the output port of the second E-plane power divider outputs a mixed signal of the K-band quasi-TEM mode and the Ka-band quasi-TEM mode; The radiation unit includes a fourth metal plate, a fifth metal plate, two one-to-eight power dividers with the same structure and parameters arranged on the fourth metal plate, and sixteen CTS radiation slots with the same structure and parameters arranged on the fifth metal plate, the fifth metal plate is located above the fourth metal plate, the fourth metal plate is located above the third metal plate, the two one-to-eight power dividers are called the first one-to-eight power divider and the second one-to-eight power divider, each of the one-to-eight power dividers has eight output ports and one input port, the sixteen CTS radiation slots are connected to the first The eight output ports of the one-to-eight power splitter and the eight output ports of the second one-to-eight power splitter are connected one by one, the input port of the first one-to-eight power splitter is connected to the output port of the first duplexer, and the input port of the second one-to-eight power splitter is connected to the output port of the second duplexer, and the 16 CTS radiation slots are evenly spaced in a sequence from front to back, and the spacing between two adjacent CTS radiation slots is less than the free space wavelength of the maximum operating frequency of the multi-band CTS antenna in the three bands of K band, Ka band and Ku band, so as to achieve Grating lobes are suppressed in all bands, and a stepped Chebyshev transformer is arranged in each of the CTS radiation slots to ensure a wide impedance bandwidth between the output of each one-to-eight power divider and the free space; the input port of the first one-to-eight power divider is used to receive the quasi-TEM mode of the Ku / K / Ka band output by the output port of the first duplexer, and then transmit it equally to its eight output ports after power distribution; the eight output ports of the first one-to-eight power divider are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots connected thereto, and the eight The CTS radiation slots are used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto, the input port of the second one-to-eight power splitter is used to receive the quasi-TEM mode of the Ku / K / Ka band outputted by the output port of the second duplexer, and then transmit it equally to its eight output ports after power distribution, the eight output ports of the second one-to-eight power splitter are used to feed the quasi-TEM mode of the Ku / K / Ka band transmitted thereto to the eight CTS radiation slots connected thereto, and the eight CTS radiation slots are used to radiate the quasi-TEM mode of the Ku / K / Ka band transmitted thereto.

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