Miniaturized ku / ka dual-band microwave network

Abstract

The application discloses a miniaturized Ku / Ka dual-band microwave network and belongs to the technical field of satellite communication. The miniaturized Ku / Ka dual-band microwave network comprises a Ka-band transceiving network and a dual-band wave divider, and equal-matching bent waveguides are connected to four filter outlets on the top circumferential side of the dual-band wave divider; wherein the equal-matching bent waveguides connected to two filter outlets in the same linear direction are mirror-symmetrical; and the waveguide outlets of the symmetrical two equal-matching bent waveguides are connected to the same folded magic T. The application has the advantages of wide working frequency band, high isolation, small insertion loss, small standing wave ratio, large power capacity, strong expandability and small structure size.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of satellite communication technology, in particular to a miniaturized Ku / Ka dual-band microwave network, which can meet the design index requirements of the microwave network of Ku / Ka band satellite communication transceiver antennas, and is especially suitable for small-aperture low-profile dual-reflector antennas. BACKGROUND

[0002] With the increasing demand for satellite communication in terms of large bandwidth, high speed, and anti-interference, higher requirements are put forward for microwave passive devices in satellite ground stations, and broadband and miniaturization have become the design direction of microwave passive devices.

[0003] Yang Zhiyou et al. of Beijing Tian Gong Kai Zheng Technology Company submitted an invention patent named "Ku / Ka dual-band shared feed" in 2012, which adopts a coaxial nested form, and the Ka band channel uses a dielectric rod to fill, but its Ka band working bandwidth is relatively narrow and cannot cover the narrow Ka working band, which has great limitations in practical application.

[0004] Tian Qing et al. of Xi'an Aerospace Hengxing Technology Company submitted an invention patent named "Ku / Ka four-frequency multi-polarization feed" in 2013, which covers Ku and Ka transceiving frequency bands, and the Ku and Ka frequency bands use side arm filters to load wave separation, and the separation of Ka receiving and transmitting frequency bands also uses wave separation, and the Ka frequency band can simultaneously output receiving and transmitting left and right rotation ports. Due to the use of two-stage wave separation form, the overall structure size is too large, which cannot be applied to small-aperture low-profile antennas.

[0005] Peng Guoxun et al. of Hunan Aerospace Huan Yu Communication Technology Company submitted an invention patent named "Ku / Ka dual-frequency transceiving shared antenna feed assembly" in 2016, which also uses wave separation for Ku and Ka transceiving components, and adds a polarization adjustment mechanism. The polarization adjustment needs to rotate the whole feed, which will result in a large rotating radius and occupy a large space.

[0006] From the above-mentioned patents, it can be seen that the main working bandwidth of the coaxial nested Ku / Ka dual-band feed is greatly limited, which is difficult to meet the demand of broadband communication; the structure size of the multi-wave separation Ku / Ka dual-band feed is large, and the Ku frequency band polarization adjustment mechanism is complex, which is not suitable for small-aperture antennas. SUMMARY

[0007] In view of the problems in the prior art, the present application provides a miniaturized Ku / Ka dual-band microwave network, which has the advantages of wide operating frequency band, high isolation, small insertion loss, small standing wave ratio, large power capacity, strong scalability and small structure size, and solves a series of problems such as frequency band expansion of a small-aperture low-profile antenna, poor electrical performance and great difficulty in Ku-band polarization adjustment.

[0008] The technical scheme of the present application is implemented as follows,

[0009] The miniaturized Ku / Ka dual-band microwave network comprises a Ka-band transceiving network and a dual-band wave dividing device 1, wherein four filter outlets on the top of the dual-band wave dividing device 1 are connected with equal-matching bent waveguides 15; two equal-matching bent waveguides connected with filter outlets in the same straight line direction are mirror-symmetrical; and the waveguide outlets of the two symmetrical equal-matching bent waveguides are connected with the same folded magic T.

[0010] The Ka-band transceiving network mainly comprises a Ka-band rotary joint, a Ka dual-band polarizer, a Ka dual-band connecting waveguide and a Ka-band frequency duplexer.

[0011] The bottom of the dual-band wave dividing device 1 is sequentially connected with the Ka-band rotary joint 9 and the Ka dual-band polarizer 10; two output ports of the Ka dual-band polarizer 10 are connected with corresponding Ka dual-band connecting waveguides 11; the other end of the Ka dual-band connecting waveguide is connected with a corresponding Ka-band frequency duplexer; the central axes of the dual-band wave dividing device 1, the Ka-band rotary joint 9 and the Ka dual-band polarizer 10 coincide; and the two Ka dual-band connecting waveguides 11 are mirror-symmetrical.

[0012] Further, the output port of one Ka-band frequency duplexer is located directly above the output port of the other Ka-band frequency duplexer, and the output ports of the two Ka-band frequency duplexers are oriented in the same direction.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1. The present application reduces the matching difficulty of the dual-band wave dividing system, expands the operating bandwidth through impedance matching sections and matching bent waveguides, and adjusts the electrical performance, so that the Ku-band meets the wideband demand of current satellite communication, and the relative bandwidth reaches 31%.

[0015] 2. The present application simplifies the Ka-band transceiving network, greatly reduces the structure size compared with the conventional circular polarizer and quadrature synthesizer combination mode and wave dividing mode, simplifies the processing and manufacturing difficulty, improves the electrical performance under the premise of ensuring wide frequency band and transceiving dual circular polarization port output, and is conducive to modular design.

[0016] 3、The Ku-band linear polarization adjustment, the Ka-band transceiving network can be fixed, the design difficulty of the polarization adjustment mechanism is reduced, and the Ka-band transmission rotating joint is reduced;

[0017] 5、The application has excellent electrical indicators, high polarization isolation, ultra-wideband characteristics, low standing wave, and low insertion loss characteristics;

[0018] 6、The application has compact structure, simple design, and easy processing, and provides guarantee for large-scale production of Ku / Ka dual-frequency communication antennas in a short period. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the Ku / Ka dual-band microwave network of the application;

[0020] Figure 2 is Figure 1 a side view.

[0021] Figure 3 is a structural schematic diagram of the dual-band waveguide of the application;

[0022] Figure 4 is a structural schematic diagram of the Ka-band transceiving network of the application;

[0023] Figure 5 is Figure 4 a side view.

[0024] BRIEF DESCRIPTION OF DRAWINGS: dual-band waveguide - 1, Ku receiving frequency band combined waveguide - 2, Ku transmitting frequency band combined waveguide - 3, Ku receiving frequency band magic T - 4, Ku transmitting frequency band magic T - 5, Ku frequency band blocking filter - 6, Ku transmitting frequency band connecting waveguide - 7, Ku frequency band L-shaped rotating joint - 8, Ka frequency band rotating joint - 9, Ka dual-band polarizer - 10, Ka dual-band connecting waveguide - 11, Ka frequency band frequency duplexer - 12, coupler - 13, filter - 14, matching bent waveguide - 15, tapered waveguide - 16, receiving combined waveguide - 17, receiving combined waveguide - 18. DETAILED DESCRIPTION

[0025] The application will be described in detail below in combination with the drawings and specific embodiments.

[0026] The Ku / Ka dual-band microwave network includes a Ku-band transceiving network and a Ka-band transceiving network, the Ku-band transceiving network includes a dual-band waveguide, a Ku receiving frequency band combined waveguide, a Ku transmitting frequency band combined waveguide, a Ku receiving frequency band magic T, a Ku transmitting frequency band magic T, a Ku frequency band blocking filter, a Ku transmitting frequency band connecting waveguide, and a Ku frequency band L-shaped rotating joint, and the Ka-band transceiving network includes a Ka frequency band rotating joint, a Ka dual-band polarizer, a Ka dual-band connecting waveguide, and a Ka frequency band frequency duplexer.

[0027] Further, the dual-frequency wave divider is connected with four low-pass filters 14 through a 6-port coupler 13, and there is an impedance matching section between the coupler and the filters, which can realize good matching characteristics within the working frequency band. The common port of the coupler is connected with a radiation feed source, and the small port in the opposite direction of the common port is connected with a Ka-band transceiving network.

[0028] Further, the Ku receiving frequency band composite waveguide includes a matching bent waveguide, a tapered waveguide and a receiving composite waveguide, and the above waveguides are symmetrically paired and sequentially connected to connect the wave divider with a Ku receiving frequency band magic T.

[0029] Further, a Ka-band rotary joint connects the dual-frequency wave divider with a Ka dual-frequency polarizer, which separates the Ku-band transceiving network from the Ka-band transceiving network, so that the Ku-band transceiving network can be independently polarized, and the Ka-band transceiving network is fixed, thereby reducing the rotation radius.

[0030] The following is a more specific embodiment:

[0031] As shown in Figure 1 , the present application mainly comprises a Ku-band transceiving network and a Ka-band transceiving network, the Ku-band transceiving network composites Ku-band transceiving signals coupled from the dual-frequency wave divider, and the Ku receiving channel and the Ku transmitting channel are orthogonal to each other. To realize the matching of the dual-frequency wave divider and the Ku-band standard waveguide, the dual-frequency wave divider is connected with the composite waveguide through a matching bent waveguide and a tapered waveguide, and the composite waveguides of the transceiving frequency bands are composed of magic Ts of the respective frequency bands. The magic T adopts a compact design, and the E arm is in a folded form, thereby reducing the height of the magic T. Compared with the traditional T-shaped waveguide composition, the magic T composition has more excellent cross-polarization characteristics. After the transceiving signals are composed, the receiving frequency band magic T is connected with a Ku-band blocking filter, the Ku-band blocking filter simultaneously provides the suppression degree for the Ku and Ka transmitting frequency bands, and the Ku and Ka frequency bands can be simultaneously used. The transmitting frequency band magic T is sequentially connected with a Ku-band L-shaped rotary joint 8 through a Ku transmitting frequency band connecting waveguide 7. The above devices are connected through waveguide flanges, the waveguide flanges adopt a non-standard form, the height of the narrow side of the waveguide is compressed, and the structure and appearance size of the microwave network are reduced.

[0032] As shown in Figure 2As shown, the dual-frequency waveguide 1 includes a coupler 13 with 6 ports and 4 filters 14. The coupler body is a tapered transition, and the inner wall adopts an exponential curve form. It can not only achieve Ku-band wideband coupling, but also enable low-loss transmission of Ka-band transceiver signals. The coupler has 4 coupling holes uniformly distributed at 90 degrees. The coupling holes are parallel to the axial direction of the tapered transition, and are directly connected to a waveguide matching section, which is connected to the filter 14. The filter adopts an island filter, and the passband covers the Ku-band transceiver frequency band. Therefore, 4 identical filters can be used, further reducing the generation of harmful Ka-band high-order modes in the coupler.

[0033] As shown in Figure 3 , the Ka-band transceiver network includes a Ka-band rotary joint 9, a Ka-band dual-frequency polarizer 10, a Ka-band dual-frequency connecting waveguide 11, and a Ka-band frequency duplexer 12. The Ka-band rotary joint 9 is connected to the dual-frequency waveguide 1 at the front end and connected to the Ka-band dual-frequency polarizer 10 at the rear end. The rotary interface of the joint separates the Ku and Ka networks. The Ka-band dual-frequency polarizer 10 has 3 ports. The common port is a circular waveguide, and the two symmetric rectangular waveguide ports at the rear end correspond to the Ka-band left and right circular polarization ports, respectively. Each port can cover the Ka-band transceiver frequency band. The left and right circular polarization ports are connected to the Ka-band frequency duplexer 12 through the first Ka-band dual-frequency connecting waveguide and the second Ka-band dual-frequency connecting waveguide, respectively. The Ka-band frequency duplexer 12 separates the Ka-band transceiver signals and provides sufficient suppression for the transceiver channels. At this time, the Ka-band transceiver network can simultaneously output Ka-band transceiver frequency band left and right circular polarization signals, and the common output port is four.

[0034] As shown in Figure 1 , 3 , the Ku-band linear polarization plane adjustment is realized by rotating the Ku-band transceiver network. The Ku-band transceiver network is connected to the turntable bearing through a connecting structure. The polarization motor drives the bearing to rotate, thereby driving the Ku-band transceiver network to rotate, and the linear polarization plane adjustment can be performed within ±90° to adapt to the reception of linear polarization signals in any polarization direction. The Ka-band transceiver network is separated from the Ku-band transceiver network through the Ka-band rotary joint 9. When the Ku-band polarization adjustment is performed, the Ka-band transceiver network can be fixed. The polarization switching network at the rear end and the receiving low-noise and transmitting waveguide can be located at a fixed position. This not only reduces the difficulty of Ku-band linear polarization plane adjustment, but also enables further functional expansion.

Claims

1. A miniaturized Ku / Ka dual-band microwave network, comprising a Ka-band transceiver network, characterized in that, It also includes a dual-frequency splitter (1), on which four filter outlets on the top periphery are connected equal-matching bend waveguides (15); wherein, the equal-matching bend waveguides connected to the two filter outlets in the same straight direction are mirror-symmetrical; the waveguide outlets of the two symmetrical equal-matching bend waveguides are connected to the same folded magic T. The Ka-band transceiver network consists of a Ka-band rotary joint, a Ka dual-band polarizer, a Ka dual-band connecting waveguide, and a Ka-band frequency duplexer. The bottom of the dual-frequency splitter (1) is connected in sequence to a Ka-band rotary joint (9) and a Ka dual-band polarizer (10); the two output ports of the Ka dual-band polarizer (10) are respectively connected to the corresponding Ka dual-band connecting waveguides (11); the other end of the Ka dual-band connecting waveguide is connected to the corresponding Ka frequency duplexer; the central axes of the dual-frequency splitter (1), the Ka-band rotary joint (9) and the Ka dual-band polarizer (10) coincide; the two Ka dual-band connecting waveguides (11) are mirror-symmetrical; The output port of one Ka-band frequency duplexer is located directly above the output port of the other Ka-band frequency duplexer, and the output ports of the two Ka-band frequency duplexers face the same direction.

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