Miniaturized Ka / Ku dual-band ultra-wideband feed source system

Abstract

The invention provides a miniaturized Ka / Ku dual-band ultra-wideband feed source system. The miniaturized Ka / Ku dual-band ultra-wideband feed source system comprises a Ka / Ku dual-band ultra-wideband integrated feed source, a Ka / Ku dual-band switching device, a Ku band waveguide, a Ka band waveguide and a Ka band circular polarizer, the Ka / Ku dual-band switching device comprises a public port, a sliding rail and a sliding block, the Ka / Ku dual-band ultra-wideband integrated feed source is connected with the public port; the sliding block is connected with the first end of the Ku frequency band waveguide and the first end of the Ka frequency band waveguide. The second end of the Ka frequency band waveguide is connected with the Ka frequency band circular polarizer; the sliding block can slide along the sliding rail, so that the common port is aligned with the Ku frequency band waveguide or the Ka frequency band waveguide, and frequency band switching between the Ka working frequency band and the Ku working frequency band is achieved. According to the Ka / Ku dual-band ultra-wideband feed source system, the whole Ka / Ku dual-band ultra-wideband feed source system integrates receiving and transmitting, the number of waveguides used in a network is greatly reduced, miniaturization of the whole system is achieved, and improvement of the whole performance of an antenna is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a miniaturized Ka / Ku dual-band ultra-wideband feed system. Background Art

[0002] Reflector antennas are widely used in the field of satellite communication technology. With the development of technology and the increase in communication business volume, the requirements for reflector antennas are gradually increasing. As the core of the reflector antenna, the feed system directly affects the performance of the reflector antenna. As the communication frequency band of satellite communication is higher and the bandwidth is continuously widened, the design and processing difficulty of the feed system is also increasing.

[0003] The existing Ka / Ku dual-band feed systems all achieve the time division multiplexing function of the Ka / Ku dual-band through a relatively complex structure, which is not conducive to the miniaturization of the Ka / Ku dual-band feed system and is not easy to process. Summary of the invention

[0004] The present invention provides a miniaturized Ka / Ku dual-band ultra-wideband feed system, which is used to solve the defect that the structure of the Ka / Ku dual-band feed system in the prior art is relatively complex, and realizes the structural simplification and miniaturization of the Ka / Ku dual-band feed system.

[0005] The present invention provides a miniaturized Ka / Ku dual-band ultra-wideband feed system, comprising: a Ka / Ku dual-band ultra-wideband integrated feed, a Ka / Ku dual-band switching device, a Ku-band waveguide, a Ka-band waveguide and a Ka-band circular polarizer;

[0006] The Ka / Ku dual-band switching device comprises a common port, a slide rail and a slider;

[0007] The Ka / Ku dual-band ultra-wideband integrated feed is connected to the common port; the slider is connected to the first end of the Ku-band waveguide and the Ka-band waveguide respectively; the second end of the Ka-band waveguide is connected to the Ka-band circular polarizer;

[0008] The slider can slide along the slide rail so that the common port is aligned with the Ku-band waveguide or the Ka-band waveguide to achieve Ka / Ku band switching.

[0009] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the Ka / Ku dual-band switching device further includes: a rotating block;

[0010] The rotating block can rotate to adjust the polarization angle of the Ku band, and realize continuous adjustment of the polarization angle within the range of -90° to +90°.

[0011] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the Ka / Ku dual-band switching device further includes: a support frame;

[0012] The support frame is used to support the common port, the slide rail, the slider and the rotating block.

[0013] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the Ka / Ku dual-band ultra-wideband integrated feed comprises: a main waveguide, a transition section and a radiation section;

[0014] The end of the main waveguide is connected to the beginning of the transition section; the end of the transition section is connected to the beginning of the radiation section;

[0015] The inner diameter of the main waveguide is the same as the inner diameter at the input port of the transition section; the inner diameter of the transition section gradually decreases from the input port to the output port; the inner diameter of the output port of the transition section is the same as the inner diameter of the starting end of the radiation section.

[0016] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the starting end of the radiation section is a throat arc contour curve.

[0017] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, a three-section corrugated groove structure is arranged on the inner wall of the cavity of the radiation section;

[0018] Each of the corrugated groove structures consists of an inclined groove and a ring-loading groove; the inclined groove is perpendicular to the inner side surface of the radiation section.

[0019] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, a flared axial groove is provided at the end of the radiation section.

[0020] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the operating frequency band of the Ka / Ku dual-band ultra-wideband integrated feed is f-2.8f; wherein f represents the lowest frequency point of the frequency band.

[0021] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the aperture of the Ka / Ku dual-band ultra-wideband integrated feed is 51.36 mm. Compared with the feed horn of the same type, it is reduced by nearly 20%, which not only realizes the miniaturization of the feed, but also ensures the characteristic index of the feed and optimizes the equalization characteristics and phase center stability of the feed horn.

[0022] According to a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention, the Ka-band circular polarizer comprises: a square waveguide, a rectangular-circular transition section and a flange;

[0023] The square waveguide is the main body of the Ka-band circular polarizer; the two ends of the square waveguide are connected to the rectangular-circular transition section; the rectangular-circular transition section is connected to the second end of the Ka-band waveguide through the flange.

[0024] The miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention can realize the frequency band switching between the two working frequency bands of Ka and Ku by sliding the slider in the Ka / Ku dual-band switching device, realize the time division multiplexing function of the Ka / Ku dual-band, and can realize the Ka / Ku frequency band switching more simply and quickly, with faster operation and simpler structure, which can not only reduce costs but also improve efficiency. Furthermore, in the Ka / Ku dual-band transmission and reception sharing, the number of waveguides used in the microwave network can be greatly reduced, the miniaturization of the entire system can be realized, the performance is good, and it is suitable for use as a feed system for the Ka / Ku dual-band reflector antenna, which helps to improve the overall performance of the satellite antenna, and is more convenient to equip, simpler to use, and cheaper, which is an important improvement on the traditional feed system.

[0025] Beneficial effects: Compared with the prior art, the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention has the following advantages:

[0026] (1) The present invention adopts a Ka / Ku dual-band ultra-wideband integrated feed source to avoid the trouble of replacing the feed source when switching frequency bands. Its structure widens the bandwidth by setting a three-section corrugated groove structure, reduces the standing wave ratio by loading the throat arc profile curve, and adds a section of feed source aperture axial groove at the end of the radiation section to play a choke role and reduce the feed source back lobe radiation, so that the bandwidth of the feed source can achieve 2.8 times the frequency, and each radiation surface has an almost overlapping edge illumination level and a relatively stable phase center in a wide frequency band, and has good cross-polarization isolation. The caliber of this feed source is only 51.36mm, which is nearly 20% smaller than that of the same type of feed horn, achieving miniaturization, and the ring loading grooves of the present invention are all perpendicular to the inner side of the corrugated horn and are only 3 sections. Compared with other 4-section ring loading groove horns, the structure is simpler and easier to process.

[0027] (2) The present invention adopts a Ka / Ku dual-band switching device to implement frequency switching between the two working frequency bands of Ka and Ku, thereby realizing the time division multiplexing function of the Ka / Ku dual-band. It has fast operation and simple structure, which not only reduces costs but also improves efficiency.

[0028] (3) The present invention adopts a Ka / Ku dual-band switching device. When the feed common port of the frequency band switching device is aligned with the Ku waveguide channel, it is fixed with a nut. By rotating the rotating block of the frequency band switching device, that is, rotating the polarization axis of the frequency band switching device, the polarization angle of the Ku band can be adjusted, so that the polarization angle can be continuously adjusted within the range of -90° to +90°. When the feed common port is aligned with the Ka waveguide channel, the frequency band is the Ka band, the Ka waveguide is directly connected to the circular polarizer, and the Ka band circularly polarized wave is formed through the circular polarizer. The Ku band cross-polarization characteristics and the Ka band circular polarization axis ratio characteristics are good.

[0029] (4) The present invention adopts a miniaturized Ka / Ku dual-band ultra-wideband feed system that integrates Ka / Ku dual-band transmission and reception, which greatly reduces the number of waveguides used in the network, realizes the miniaturization of the entire system, and helps to improve the overall performance of the antenna. It is easy to equip, simple to use, and inexpensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0032] Figure 2 It is an exploded diagram of the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0033] Figure 3 It is a structural schematic diagram of a Ka / Ku dual-band switching device in a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0034] Figure 4 It is a schematic diagram of two states of a Ka / Ku dual-band switching device in a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0035] Figure 5 It is a schematic diagram of the states of the Ka / Ku dual-band switching device in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention when the polarization angles in the Ku band are +45° and -45° respectively;

[0036] Figure 6It is a structural schematic diagram of a Ka / Ku dual-band ultra-wideband integrated feed in a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0037] Figure 7 It is a schematic diagram of the standing wave ratio of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0038] Figure 8 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at a low frequency point;

[0039] Fig. 9 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at the intermediate frequency point;

[0040] Fig.10 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at a high frequency point;

[0041] Fig.11 It is a schematic diagram of the phase center of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0042] Fig.12 It is a structural schematic diagram of a Ka-band circular polarizer in a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0043] Fig.13 It is a schematic diagram of the standing wave ratio of a Ka-band circular polarizer in a miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention;

[0044] Fig.14 It is a schematic diagram of the phase shift of the Ka-band circular polarizer in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the embodiments of the present invention, it should be noted that the terms "center", "length", "width", "height", "upper", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance, and do not involve order.

[0047] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0048] Combine the following Figures 1 to 14 The miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention is described.

[0049] Figure 1 It is a structural schematic diagram of the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Figure 2 FIG. 1 is an exploded diagram of the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Figure 1 and Figure 2 As shown, the Ka / Ku dual-band ultra-wideband feed system includes: a Ka / Ku dual-band ultra-wideband integrated feed 1, a Ka / Ku dual-band switching device 2, a Ku-band waveguide 3, a Ka-band waveguide 4 and a Ka-band circular polarizer 5.

[0050] Specifically, the Ka / Ku dual-band ultra-wideband feed system may include: a Ka / Ku dual-band ultra-wideband integrated feed 1 and a microwave network. The microwave network may include a Ka / Ku dual-band switching device 2, a Ku-band waveguide 3, a Ka-band waveguide 4 and a Ka-band circular polarizer 5.

[0051] Optionally, the Ka / Ku dual-band ultra-wideband integrated feed source 1 can be a feed source device such as a corrugated horn. The feed source device can operate in two frequency bands, namely, the Ku band and the Ka band.

[0052] Optionally, the corrugated horn may be a large-angle corrugated horn.

[0053] The Ka / Ku dual-band ultra-wideband integrated feed source 1 shares a main and a secondary reflector.

[0054] The Ku-band waveguide 3 can constitute a Ku-band channel alone, and the Ka-band waveguide 4 and the Ka-band circular polarizer 5 can constitute a Ka-band channel.

[0055] The Ka / Ku dual-band switching device 2 can be used to switch between aligning the Ka / Ku dual-band ultra-wideband integrated feed source 1 with the Ku-band channel or aligning with the Ka-band channel, so that the Ka / Ku dual-band ultra-wideband feed source system can realize the time division multiplexing function of the Ka / Ku dual-band. When the Ka / Ku dual-band ultra-wideband integrated feed source 1 is aligned with the Ku-band channel, the Ka / Ku dual-band ultra-wideband feed source system operates in the Ku-band, and when the Ka / Ku dual-band ultra-wideband integrated feed source 1 is aligned with the Ka-band channel, the Ka / Ku dual-band ultra-wideband feed source system operates in the Ka-band.

[0056] Figure 3 Schematic diagram of the structure of the Ka / Ku dual-band switching device in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Figure 3 As shown, the Ka / Ku dual-band switching device 2 includes a common port 21 , a slide rail 22 and a slider 23 .

[0057] The Ka / Ku dual-band ultra-wideband integrated feed source 1 is connected to the common port 21 ; the slider 22 is respectively connected to the first ends of the Ku-band waveguide 3 and the Ka-band waveguide 4 ; and the second end of the Ka-band waveguide 4 is connected to the Ka-band circular polarizer 5 .

[0058] The slider 23 can slide along the slide rail 22 so that the common port 21 is aligned with the Ku-band waveguide 3 or the Ka-band waveguide 4 to achieve Ka / Ku band switching.

[0059] Specifically, the slider 23 of the Ka / Ku dual-band switching device 2 can be connected to the Ku-band waveguide 3 through a flange interface. The slider 23 of the Ka / Ku dual-band switching device 2 can be connected to the Ka-band waveguide 4 through a flange interface.

[0060] The Ka / Ku dual-band ultra-wideband feed system provided in the embodiment of the present invention can work in the Ka band and the Ku band in time division. The Ka / Ku dual-band switching device 2 can realize the Ka / Ku band switching by sliding the slider 23 in the Ka / Ku dual-band switching device 2 along the slide rail 22 so that the common port 21 is aligned with the Ku band waveguide 3 or the Ka band waveguide 4.

[0061] The common port 21 is aligned with the Ku-band waveguide 3 or the Ka-band waveguide 4 , corresponding to two states of the Ka / Ku dual-band switching device 2 , respectively. Figure 4Schematic diagram of two states of the Ka / Ku dual-band switching device in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. The position change of the slider 23 in the above two states can be as follows Figure 4 shown.

[0062] When the operating frequency band of the Ka / Ku dual-band ultra-wideband feed system is the Ka band, the common port 21 is aligned with the Ka-band waveguide 4, and the Ka-band waveguide 4 is directly connected to the Ka-band circular polarizer 5 to form a Ka-band circularly polarized wave through the Ka-band circular polarizer 5.

[0063] It should be noted that the miniaturized Ka / Ku dual-band ultra-wideband feed system is the core of the satellite communication antenna system, and it is required to have high-performance electrical characteristics. High-performance electrical characteristics include not only the bandwidth standing wave ratio, equalization characteristics and phase center stability of the feed, but also the voltage standing wave ratio, loss characteristics and axial ratio of each waveguide port of the microwave network at the lower end. In addition, the Ka / Ku dual-band ultra-wideband feed system is also required to have a simple structure and be easy to process.

[0064] The Ka / Ku dual-band ultra-wideband feed system provided by the embodiment of the present invention, the Ka / Ku dual-band ultra-wideband integrated feed 1 efficiently shares a main and secondary reflector surface, avoiding the trouble of replacing the feed when switching frequency bands, so that the Ka / Ku dual-band ultra-wideband integrated feed 1 can be miniaturized. In addition, the Ka / Ku dual-band ultra-wideband feed system not only works in the Ka band or the Ku band in time-sharing, but also realizes the function of sharing the Ka / Ku dual-band transmission and reception, making the structure simple and compact, and further improving the utilization rate of the antenna. Therefore, the Ka / Ku dual-band ultra-wideband feed system has the characteristics of miniaturization, simple and compact structure, miniaturization, ultra-wideband, high reliability, small standing wave ratio, good cross-polarization in the Ku band, low axial ratio of circular polarization in the Ka band, good equalization characteristics, stable phase center and good axial ratio characteristics.

[0065] The embodiment of the present invention can achieve frequency switching between the two working frequency bands of Ka and Ku by sliding the slider in the Ka / Ku dual-band switching device, realize the time division multiplexing function of the Ka / Ku dual-band, and can realize the Ka / Ku frequency switching more simply and quickly, with faster operation and simpler structure, which can not only reduce costs but also improve efficiency. Furthermore, in the Ka / Ku dual-band transmission and reception sharing, the number of waveguides used in the microwave network can be greatly reduced, the miniaturization of the entire system can be achieved, the performance is good, and it is suitable for use as a feed system for the Ka / Ku dual-band reflector antenna, which helps to improve the overall performance of the satellite antenna, and is more convenient to equip, simpler to use, and cheaper, which is an important improvement on the traditional feed system.

[0066] Based on the content of any of the above embodiments, Figure 3 As shown, the Ka / Ku dual-band switching device 2 also includes: a rotating block 24; the rotating block 24 can rotate to adjust the polarization angle of the Ku band to achieve continuous adjustment of the polarization angle within the range of -90° to +90°.

[0067] Specifically, when the operating frequency band of the Ka / Ku dual-band ultra-wideband feed system is the Ku band, the common port 21 is aligned with the Ku band waveguide 3, and the polarization angle of the Ku band can be adjusted by rotating the polarization axis of the Ka / Ku dual-band switching device 2, so that the polarization angle of the Ku band can be continuously adjusted within the range of -90° to +90°.

[0068] Optionally, when the common port 21 is aligned with the Ku-band waveguide 3 , the common port 21 can be fixed by a nut 25 , and the polarization angle of the Ku band can be adjusted by rotating the rotating block 24 , that is, rotating the polarization axis of the Ka / Ku dual-band switching device 2 .

[0069] When the feed common port is aligned with the Ku waveguide channel, it is fixed with a nut. By rotating the rotating block of the frequency band switching device, the polarization angle of the Ku band can be adjusted, so that the polarization angle can be continuously adjusted within the range of -90° to +90°.

[0070] Figure 5 It is a schematic diagram of the states of the Ka / Ku dual-band switching device in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention when the polarization angles in the Ku band are +45° and -45° respectively. Figure 5 The state of the Ka / Ku dual-band switching device 2 is shown when the polarization angles of the Ku band are +45° and -45° respectively.

[0071] The embodiment of the present invention can achieve continuous adjustment of the polarization angle of the Ku band within the range of -90° to +90° by rotating the rotating block and rotating the polarization axis of the Ka / Ku dual-band switching device 2 .

[0072] Based on the content of any of the above embodiments, Figure 3 As shown, the Ka / Ku dual-band switching device 2 also includes: a support frame 26; the support frame 26 is used to support the common port 21, the slide rail 22, the slider 23 and the rotating block 24.

[0073] Figure 6 Schematic diagram of the structure of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Figure 6 As shown, the Ka / Ku dual-band ultra-wideband integrated feed source 1 includes: a main waveguide 11, a transition section 12 and a radiation section 13.

[0074] The end of the main waveguide 11 is connected to the beginning of the transition section 12 ; the end of the transition section 12 is connected to the beginning of the radiation section 13 .

[0075] The inner diameter of the main waveguide 11 is the same as the inner diameter at the input port of the transition section 12 ; the inner diameter of the transition section 12 gradually decreases from the input port to the output port; the inner diameter of the output port of the transition section 12 is the same as the inner diameter of the starting end of the radiation section 13 .

[0076] Specifically, the input port of the transition section 12 is the beginning of the transition section 12 , and the output port of the transition section 12 is the end of the transition section 12 .

[0077] The starting end of the main waveguide 1 is connected to the common port 21 of the Ka / Ku dual-band switching device 2 .

[0078] The embodiments of the present invention can achieve miniaturization and improve the performance of the Ka / Ku dual-band ultra-wideband integrated feed by designing the structures of the main waveguide, the transition section and the radiation section.

[0079] Based on the content of any of the above embodiments, the starting end of the radiation section 13 is a throat arc contour curve.

[0080] Specifically, the beginning of the radiation section 13 may adopt a throat arc profile curve to reduce the standing wave ratio and improve the performance of the Ka / Ku dual-band ultra-wideband integrated feed.

[0081] The opening angle of the Ka / Ku dual-band ultra-wideband integrated feed 1 in the radiation section 13 is determined by the tangent slope of its inner wall profile, and the tangent slope of some inner wall profiles changes slowly within a small opening angle range, but when the angle is large, it may cause a drastic change in the opening angle (the tangent slope of the inner wall), which is not suitable for the application of large opening angle speakers. Therefore, in order to obtain a good standing wave ratio in a wide band, the embodiment of the present invention uses a throat arc profile curve at the beginning of the radiation section 13 to connect to the main waveguide, and the standing wave ratio in the Ku low frequency band is well improved.

[0082] Based on the content of any of the above embodiments, Figure 6 As shown, three sections of corrugated groove structures 130 are arranged on the inner wall of the cavity of the radiation section 13 ; each corrugated groove structure 130 is composed of an inclined groove 131 and a ring loading groove 132 ; the inclined groove 131 is perpendicular to the inner side surface of the radiation section 13 .

[0083] Specifically, a three-stage corrugated groove structure may be provided on the inner wall of the cavity of the radiation section 13, which can broaden the bandwidth and improve the performance of the Ka / Ku dual-band ultra-wideband integrated feed.

[0084] The inclined slots 131 are all inclined (relative to the output direction) perpendicular to the inner side of the radiation section 13 of the Ka / Ku dual-band ultra-wideband integrated feed source 1 and have only three sections. Compared with other 4-section ring-loaded slot horns, the structure is simpler and easier to process and mold.

[0085] In order to realize the miniaturization of the Ka / Ku dual-band ultra-wideband feed system, the Ka / Ku dual-band ultra-wideband integrated feed 1 of the embodiment of the present invention adopts a large-angle corrugated horn. Because the main polarization radiation pattern of the large-angle corrugated horn is mainly determined by its angle, rather than by the aperture size, the Ka / Ku dual-band ultra-wideband integrated feed 1 can be miniaturized.

[0086] According to the radiation characteristics of the corrugated horn, the inclined slot 131 can be designed first. Preferably, the depth of the inclined slot 131 is a quarter wavelength, so as to effectively suppress the harmful longitudinal current in the Ka / Ku dual-band ultra-wideband integrated feed source 1, and E Ф and H Ф is zero, making the boundary conditions of transverse electric wave and transverse magnetic wave identical. In addition, due to the existence of the inclined groove 131, the TE 11 The model becomes HE 11 Model, HE 11 The TE wave and TM wave components in the mode have the same cutoff frequency and phase velocity, which are independent of the frequency. Therefore, the corrugated horn with the inclined slot 131 has a wider working bandwidth.

[0087] Optionally, the depth of the inclined groove can be set to about one quarter of the wavelength of the Ku receiving frequency band, that is, about 7 mm. However, the general large-angle corrugated horn adopts an inclined groove structure. Although the working frequency band is wide, it cannot meet the requirements of the Ka and Ku bands. The embodiment of the present invention achieves the widening of the working bandwidth by adding an asymmetric ring loading groove 132 on the basis of the inclined groove 131. The embodiment of the present invention can simultaneously suppress the HE generated in the low frequency band by setting the ring loading groove 132. 11 and HE generated by high frequency band 12 The mode can expand the working bandwidth of the Ka / Ku dual-band ultra-wideband integrated feed source 1 to the Ka and Ku bands. The loading depth of the ring loading groove 132 can be set to about two-thirds of the depth of the corrugated groove structure 130, and the width of the ring loading groove and the width of the corrugated groove structure 130 can be roughly similar. Through the above settings, approximately the same E-plane and H-plane radiation patterns can be obtained with a stable phase center and a smaller cross-polarization.

[0088] Based on the content of any of the above embodiments, Figure 6 As shown, the end of the radiation section 13 is provided with a bell-mouth axial groove 133 .

[0089] Specifically, a feed aperture axial slot may be added at the end of the radiation section 13 to play a choke role and reduce the feed back lobe radiation.

[0090] Figure 7 Schematic diagram of the standing wave ratio of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Figure 7 As shown, through simulation, it can be obtained that the bandwidth of the Ka / Ku dual-band ultra-wideband integrated feed 1 reaches 2.8 times the frequency, and the standing wave ratio is less than 1.13.

[0091] Figure 8 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at a low frequency point. Fig. 9 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at the intermediate frequency point. Fig.10 It is a schematic diagram of the radiation direction of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention at the high frequency point. Figure 8 , Fig. 9 and Fig.10 FIG. 2 shows the radiation pattern of the Ka / Ku dual-band ultra-wideband integrated feed source 1 within the working frequency band. Figure 8 , Fig. 9 and Fig.10 As shown, through simulation, it can be obtained that the edge illumination levels of the three frequency points of high, medium and low of the Ka / Ku dual-band ultra-wideband integrated feed source 1 at 37° are -10dB to 15dB, and each radiating surface has an almost overlapping edge illumination level in the wide frequency band.

[0092] Fig.11 Schematic diagram of the phase center of the Ka / Ku dual-band ultra-wideband integrated feed in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Fig.11 As shown, through simulation, it can be obtained that the phase fluctuation of the Ka / Ku dual-band ultra-wideband integrated feed source 1 within the working frequency band is ≤8mm, and compared with other speakers, the phase center stability is good.

[0093] In summary, the Ka / Ku dual-band ultra-wideband integrated feed source 1 has almost overlapping approximate phase centers and relatively stable edge illumination levels on each radiating surface within a wide frequency band, and has good cross-polarization isolation.

[0094] Based on the content of any of the above embodiments, the operating frequency band of the Ka / Ku dual-band ultra-wideband integrated feed source 1 is f-2.8f; wherein f represents the lowest frequency point of the frequency band.

[0095] Specifically, the operating frequency band of the Ka / Ku dual-band ultra-wideband integrated feed source 1 is f-2.8f, that is, the Ka / Ku dual-band ultra-wideband integrated feed source 1 has an ultra-wide bandwidth and can achieve 2.8 times the frequency, wherein f is the lowest frequency point in the Ka / Ku dual-band.

[0096] Based on the content of any of the above embodiments, the caliber of the Ka / Ku dual-band ultra-wideband integrated feed source 1 is 51.36 mm.

[0097] Specifically, the aperture of the Ka / Ku dual-band ultra-wideband integrated feed 1 can be as small as 51.36 mm, which is nearly 20% smaller than that of the same type of feed horn. It not only realizes the miniaturization of the feed, but also ensures the characteristic indicators of the feed and optimizes the equalization characteristics and phase center stability of the feed. It is suitable for use as a feed for Ka / Ku dual-band reflector antennas.

[0098] Fig.12 Schematic diagram of the structure of the Ka-band circular polarizer in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Fig.12 As shown, the Ka-band circular polarizer 5 includes: a square waveguide 51, a rectangular-circular transition section 52 and a flange 53; the square waveguide 51 is the main body of the Ka-band circular polarizer 5; both ends of the square waveguide 51 are connected to the rectangular-circular transition section 52; the rectangular-circular transition section 52 is connected to the second end of the Ka-band waveguide 4 through the flange 53.

[0099] Specifically, the main body of the Ka-band circular polarizer 5 is a square waveguide 51, and both ends of the square waveguide 51 are connected to a rectangular-circular transition section 52. One section of the rectangular-circular transition section 52 is connected to the Ka-band waveguide 4 through a flange 53.

[0100] Optionally, multiple pairs of metal diaphragms 54 may be built into the upper and lower walls of the square waveguide 51 so that it presents different capacitive and inductive reactance characteristics to electromagnetic waves of different modes, ultimately making the phase difference of electromagnetic waves in two directions about 90°, thereby forming circularly polarized waves.

[0101] Optionally, the number of pairs of metal diaphragms 54 may be 8 to 20. Preferably, the number of pairs of metal diaphragms 54 may be 16 pairs.

[0102] Optionally, the flange 53 may be a circular flange.

[0103] Fig.13 Schematic diagram of the standing wave ratio of the Ka-band circular polarizer in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Fig.13 As shown, through simulation, it can be obtained that within the bandwidth of the Ka / Ku dual-band ultra-wideband integrated feed 1, the standing wave ratio of the Ka-band circular polarizer 5 is less than 1.12.

[0104] Fig.14 Schematic diagram of the phase shift of the Ka-band circular polarizer in the miniaturized Ka / Ku dual-band ultra-wideband feed system provided by the present invention. Fig.14 As shown, through simulation, it can be obtained that within the bandwidth of the Ka / Ku dual-band ultra-wideband integrated feed 1, the phase shift difference of the Ka-band circular polarizer 5 is within the range of 90°±8°.

[0105] In summary, the Ka / Ku dual-band ultra-wideband feed system provided by the embodiment of the present invention has good Ka-band circular polarization axial ratio performance.

[0106] Based on the content of any of the above embodiments, a reflector antenna includes any of the above Ka / Ku dual-band ultra-wideband feed systems.

[0107] The reflector antenna provided in an embodiment of the present invention includes a Ka / Ku dual-band ultra-wideband feed system, and the specific implementation method thereof is consistent with the implementation method described in the aforementioned Ka / Ku dual-band ultra-wideband feed system embodiment, and can achieve the same beneficial effects, which will not be repeated here.

[0108] Based on the content of any of the above embodiments, a satellite communication system includes any of the above Ka / Ku dual-band ultra-wideband feed systems.

[0109] The satellite communication system provided in an embodiment of the present invention includes a Ka / Ku dual-band ultra-wideband feed system, the specific implementation of which is consistent with the implementation described in the aforementioned Ka / Ku dual-band ultra-wideband feed system embodiment, and can achieve the same beneficial effects, which will not be repeated here.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A miniaturized Ka / Ku dual-band ultra-wideband feed system, characterized in that: include: Ka / Ku dual-band ultra-wideband integrated feed, Ka / Ku dual-band switching device, Ku-band waveguide, Ka-band waveguide and Ka-band circular polarizer; The Ka / Ku dual-band switching device comprises a common port, a slide rail and a slider; The Ka / Ku dual-band ultra-wideband integrated feed is connected to the common port; the slider is connected to the first end of the Ku-band waveguide and the Ka-band waveguide respectively; the second end of the Ka-band waveguide is connected to the Ka-band circular polarizer; The slider can slide along the slide rail so that the common port is aligned with the Ku-band waveguide or the Ka-band waveguide to achieve Ka / Ku band switching.

2. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 1, characterized in that: The Ka / Ku dual-band switching device further includes: a rotating block; The rotating block can rotate to adjust the polarization angle of the Ku band, and realize continuous adjustment of the polarization angle within the range of -90° to +90°.

3. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 2, characterized in that: The Ka / Ku dual-band switching device further includes: a supporting frame; The support frame is used to support the common port, the slide rail, the slider and the rotating block.

4. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 1, characterized in that: The Ka / Ku dual-band ultra-wideband integrated feed source comprises: a main waveguide, a transition section and a radiation section; The end of the main waveguide is connected to the beginning of the transition section; the end of the transition section is connected to the beginning of the radiation section; The inner diameter of the main waveguide is the same as the inner diameter at the input port of the transition section; the inner diameter of the transition section gradually decreases from the input port to the output port; the inner diameter of the output port of the transition section is the same as the inner diameter of the starting end of the radiation section.

5. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 4, characterized in that: The starting end of the radiation section is a throat arc contour curve.

6. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 5, characterized in that: The inner wall of the cavity of the radiation section is provided with three sections of corrugated groove structures; Each of the corrugated groove structures consists of an inclined groove and a ring-loading groove; the inclined groove is perpendicular to the inner side surface of the radiation section.

7. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 6, characterized in that: The end of the radiation section is provided with a bell-mouth surface axial groove.

8. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 2, characterized in that: The operating frequency band of the Ka / Ku dual-band ultra-wideband integrated feed is f-2.8f, wherein f represents the lowest frequency point of the frequency band.

9. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to claim 2, characterized in that: The aperture of the Ka / Ku dual-band ultra-wideband integrated feed is 51.36 mm.

10. The miniaturized Ka / Ku dual-band ultra-wideband feed system according to any one of claims 1 to 9, characterized in that: The Ka-band circular polarizer comprises: a square waveguide, a rectangular-circular transition section and a flange; The square waveguide is the main body of the Ka-band circular polarizer; the two ends of the square waveguide are connected to the rectangular-circular transition section; the rectangular-circular transition section is connected to the second end of the Ka-band waveguide through the flange.

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