A S / C-band broadband feed

Abstract

The present invention discloses an S / C-band broadband feed, belonging to the technical field of antennas. Through a C-band ridge horn array, the C-band ridge horn array includes: a first pyramidal horn; a first exponential dual ridge, which is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn and is fixed integrally with the first pyramidal horn; an S-band ridge horn array, the S-band ridge horn array includes a first S-band ridge horn sub-array and a second S-band ridge horn sub-array, the first S-band ridge horn sub-array includes: a second pyramidal horn; a second exponential dual ridge, which is symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn; an anti-band interference reflector, which is arranged on the periphery of the first pyramidal horn near the large end, thereby achieving the technical effect of realizing coplanar full-band coverage in the S band and the C band.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly relates to an S / C band broadband feed. Background Art

[0002] The feed is an important part of the reflector antenna system. Its function is to radiate the electrical signal from the radio frequency in the form of electromagnetic waves to the reflector, and the signal from the satellite enters the feed through the reflector. Currently, the feeds used for reflectors mainly focus on dual-frequency or multi-frequency sharing technologies. The dual-frequency shared feeds are relatively mature in application, such as L / C, S / C, C / Ku, Ku / Ka, etc. Their common feature is that they only support the reception or transmission of partial frequency bands of dual-frequency or triple-frequency, and none of them have the ability to cover the entire dual-frequency band. Moreover, dual-frequency feeds have been reported in the literature, but mostly C / Ku dual-band, L / C dual-band, and S / X dual-band feeds. Their common feature is that their relative bandwidth is relatively narrow and the two operating frequency bands are far apart. Therefore, there are few broadband feeds that simultaneously have the capabilities of high-power transmission in the S / C band, strong isolation and high gain performance in the entire frequency band. Summary of the Invention

[0003] The present invention provides an S / C band broadband feed to solve the technical problems of impedance matching under ultra-wideband conditions and poor signal isolation under high-power working conditions when there is no frequency band interval between high and low frequencies in the prior art, achieving the technical effect of simultaneously realizing the ability to transmit high-gain high-power signals in the S / C band broadband without replacing the feed, realizing the coplanar full-band coverage of the S band and the C band, and improving the utilization rate of resources.

[0004] The present invention provides an S / C band broadband feed applied to a dual-reflector ring-focus antenna, including: a C band ridge horn array, the C band ridge horn array includes: a first pyramidal horn; a first exponential dual ridge, the first exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn and is fixed integrally with the first pyramidal horn; an S band ridge horn array, the S band ridge horn array includes a first S band ridge horn array and a second S band ridge horn array, and the first S band ridge horn array and the second S band ridge horn array are symmetrically arranged with the C band ridge horn array as the center. Among them, the first S band ridge horn array includes: a second pyramidal horn; a second exponential dual ridge, the second exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn and is fixed integrally with the second pyramidal horn; an anti-band interference reflector, the anti-band interference reflector is arranged on the periphery of the first pyramidal horn near the large end.

[0005] Preferably, the second S-band ridge horn array includes: a third pyramidal horn; a third exponential double ridge, which is symmetrically arranged on the inner side walls of two opposite wide sides of the third pyramidal horn and is fixed integrally with the third pyramidal horn.

[0006] Preferably, the distance between the second pyramidal horn and the third pyramidal horn is 0.9×λ S中心频率 , where λ is the wavelength, and the S center frequency is the center frequency of the S band and is 3 GHz.

[0007] Preferably, the second pyramidal horn and the third pyramidal horn have the same parameters.

[0008] Preferably, the horn radiation port heights of the second pyramidal horn and the third pyramidal horn are both higher than the horn radiation port height of the first pyramidal horn.

[0009] Preferably, the first pyramidal horn, the second pyramidal horn, and the third pyramidal horn perform microwave signal synthesis through a power distribution and combination network.

[0010] Preferably, the S / C-band broadband feed also includes: a first ridge waveguide H-T, which is arranged at a position close to the small end of the first pyramidal horn; a first waveguide coaxial converter, which is connected to the first pyramidal horn through the first ridge waveguide H-T.

[0011] Preferably, the S / C-band broadband feed also includes: a second waveguide coaxial converter, which is connected to the small end of the second pyramidal horn; a third waveguide coaxial converter, which is connected to the small end of the third pyramidal horn.

[0012] Preferably, the S / C-band broadband feed also includes: a broadband power divider, which is connected to the second waveguide coaxial converter and the third waveguide coaxial converter through coaxial cables.

[0013] Preferably, the distance between the anti-band interference reflector and the large end port of the first pyramidal horn is 0.5×λ S中心频率 , where λ is the wavelength, and the S center frequency is the center frequency of the S band and is 3 GHz.

[0014] One or more of the above technical solutions in the embodiments of the present invention have at least one or more of the following technical effects:

[0015] An S / C band broadband feed provided by an embodiment of the present invention is applied to a dual-reflector ring focus antenna and includes: a C band ridge horn array, an S band ridge horn array, and an anti-band interference reflector. Specifically, the C band ridge horn array includes: a first pyramidal horn and a first exponential dual ridge, wherein the first exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn, and thus is fixed to the first pyramidal horn as a whole. Further, the S band ridge horn array includes a first S band ridge horn array and a second S band ridge horn array, wherein the first S band ridge horn array and the second S band ridge horn array are symmetrically arranged with the C band ridge horn array as the center. The first S band ridge horn array includes: a second pyramidal horn and a second exponential dual ridge, and the second exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn, and thus is fixed to the second pyramidal horn as a whole; the anti-band interference reflector is arranged on the periphery of the first pyramidal horn near the large end. There is a band overlap between the S band and the C band, and the feed is a high-power feed. Without using isolators and filters, by adding an anti-band interference reflector, the isolation degree of the antenna at the S and C ports is lower than -17 dB, thereby solving the impedance matching problem existing under the condition of ultra-wideband in the prior art, and the technical problem of poor signal isolation degree under the condition of high-power operation and without frequency band interval between high and low frequencies, achieving the technical effect of being able to simultaneously realize the ability to transmit high-gain high-power signals in the S / C band without replacing the feed, realizing the coplanar full-band coverage of the S band and the C band, and improving the utilization rate of resources.

[0016] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an S / C band broadband feed in an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the S / C port isolation degree of an S / C band broadband feed in an embodiment of the present invention;

[0019] Figure 3 It is the antenna pattern of the S band (frequency f = 2 GHz) of an S / C band broadband feed in an embodiment of the present invention;

[0020] Figure 4 It is the antenna pattern of another S band (frequency f = 3 GHz) of an S / C band broadband feed in an embodiment of the present invention;

[0021] Figure 5It is the antenna pattern of another S band (frequency f = 4 GHz) of a S / C band broadband feed source in an embodiment of the present invention;

[0022] Figure 6 It is the antenna pattern of the C band (frequency f = 4 GHz) of a S / C band broadband feed source in an embodiment of the present invention;

[0023] Figure 7 It is the antenna pattern of another C band (frequency f = 5 GHz) of a S / C band broadband feed source in an embodiment of the present invention;

[0024] Figure 8 It is the antenna pattern of another C band (frequency f = 6 GHz) of a S / C band broadband feed source in an embodiment of the present invention;

[0025] Figure 9 It is the antenna pattern of yet another C band (frequency f = 7 GHz) of a S / C band broadband feed source in an embodiment of the present invention;

[0026] Figure 10 It is the antenna pattern of yet yet another C band (frequency f = 8 GHz) of a S / C band broadband feed source in an embodiment of the present invention.

[0027] Explanation of reference numerals: C band ridge horn array 1, first pyramidal horn 2, first exponential double ridge 3, first S band ridge horn array 41, second S band ridge horn array 42, second pyramidal horn 5, second exponential double ridge 6, anti-band interference reflector 7, third pyramidal horn 8, third exponential double ridge 9, first ridge waveguide H-T 10, first waveguide coaxial converter 11, second waveguide coaxial converter 12, third waveguide coaxial converter 13, broadband power divider 14. Detailed implementation manners

[0028] The embodiment of the present invention provides a S / C band broadband feed source to solve the technical problems of impedance matching under the condition of ultra-wideband in the prior art, and poor signal isolation under the condition of high power operation when there is no frequency band interval between high and low frequencies.

[0029] The overall idea of the technical solution in the embodiment of the present invention is as follows:

[0030] An S / C band broadband feed provided by an embodiment of the present invention is applied to a dual-reflector ring focus antenna and includes: a C band ridge horn array, where the C band ridge horn array includes: a first pyramidal horn; a first exponential dual ridge, the first exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn and is fixed integrally with the first pyramidal horn; an S band ridge horn array, the S band ridge horn array includes a first S band ridge horn array and a second S band ridge horn array, and the first S band ridge horn array and the second S band ridge horn array are symmetrically arranged with the C band ridge horn array as the center. Among them, the first S band ridge horn array includes: a second pyramidal horn; a second exponential dual ridge, the second exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn and is fixed integrally with the second pyramidal horn; an anti-band interference reflector, the anti-band interference reflector is arranged on the periphery of the first pyramidal horn near the large end, thereby achieving the technical effect of being able to simultaneously realize the emission ability of high-gain high-power signals in the S / C bands without replacing the feed, realizing the coplanar full-band coverage of the S band and the C band, and improving the utilization rate of resources.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] Figure 1 An S / C band broadband feed in an embodiment of the present invention is applied to a dual-reflector ring focus antenna, as Figure 1 shown. The S / C band broadband feed includes:

[0034] A C band ridge horn array 1, where the C band ridge horn array 1 includes: a first pyramidal horn 2; a first exponential dual ridge 3, the first exponential dual ridge 3 is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn 2 and is fixed integrally with the first pyramidal horn 2.

[0035] Specifically, the S / C band broadband feed in this embodiment is an S / C band high-gain, strong isolation, and high-power-resistant broadband feed. The S / C band broadband feed can operate in the entire S and C bands. Specifically: the S / C band broadband feed can operate in the S band from 2 GHz to 4 GHz and the C band from 4 GHz to 8 GHz, and can be applied to a dual-reflector ring focus antenna during actual use.

[0036] Further, the S / C band broadband feed is composed of three ultra-wideband horns. The middle horn is an ultra-wideband horn for the high frequency band (4 GHz - 8 GHz), and the two horns on the side are ultra-wideband horns for the low frequency band (2 GHz - 4 GHz). Specifically: The C-band ridge horn array 1 is the ultra-wideband horn array for the high frequency band. The C-band ridge horn array 1 mainly includes a first pyramidal horn 2 and a first exponential dual ridge 3. Among them, for the part where the horn opens, the horn wall is designed similarly to a conventional horn, and the ridge opens in an exponential form. The dual-ridge structure extends from the waveguide to the pyramidal horn. The outer shape of the first pyramidal horn 2 is a horn shape, and it is composed of four faces to form a horn shape with different upper and lower opening sizes. Since the two ends of the first pyramidal horn 2 are of different sizes, that is, one end of the first pyramidal horn 2 is a large port, and the other end is a small port. The cross-sectional shapes of the two ports of the first pyramidal horn 2 are both rectangular. Further, on the inner side walls of the two wide sides at the large end of the first pyramidal horn 2, the first exponential dual ridge 3 is symmetrically installed. At the same time, the installation direction of the first exponential dual ridge 3 is the extending direction of the first pyramidal horn 2, that is, the first exponential dual ridge 3 is fixedly arranged along the height direction of the first pyramidal horn 2, and thus is integrated with the wide side of the first pyramidal horn 2.

[0037] The S / C band broadband feed further includes: an S-band ridge horn array, and the S-band ridge horn array includes a first S-band ridge horn array 41 and a second S-band ridge horn array 42. Moreover, the first S-band ridge horn array 41 and the second S-band ridge horn array 42 are symmetrically arranged with the C-band ridge horn array 1 as the center. Among them, the first S-band ridge horn array 41 includes: a second pyramidal horn 5; a second exponential dual ridge 6, and the second exponential dual ridge 6 is symmetrically arranged on the inner side walls of the two opposite wide sides of the second pyramidal horn 5 and is fixed to the second pyramidal horn 5 as a whole.

[0038] Specifically, the S-band ridge horn array mainly includes a first S-band ridge horn array 41 and a second S-band ridge horn array 42. The first S-band ridge horn array 41 and the second S-band ridge horn array 42 are symmetrically arranged on both sides of the C-band ridge horn array 1, that is, the first S-band ridge horn array 41 and the second S-band ridge horn array 42 are symmetrically arranged with the C-band ridge horn array 1 as the central axis. Further, the first S-band ridge horn array 41 includes a second pyramidal horn 5 and a second exponential dual ridge 6. As described above, the outer shape of the second pyramidal horn 5 is also a horn shape, and it is composed of four surfaces to form a horn shape with different sizes of upper and lower openings. Since the two ends of the second pyramidal horn 5 are of different sizes, that is to say, one end of the second pyramidal horn 5 is a large port and the other end is a small port, and the cross-sectional shapes of the two ports of the second pyramidal horn 5 are both rectangular. Further, on the inner side walls of the two wide sides of the large end of the second pyramidal horn 5, the second exponential dual ridge 6 is symmetrically installed. At the same time, the installation direction of the second exponential dual ridge 6 is the extension direction of the second pyramidal horn 5, that is to say, the second exponential dual ridge 6 is fixedly arranged along the height direction of the second pyramidal horn 5, and then is integrated with the wide side of the second pyramidal horn 5.

[0039] The S / C-band broadband feed further includes: an anti-band interference reflector 7, and the anti-band interference reflector 7 is arranged on the periphery of the first pyramidal horn 2 near the large end.

[0040] Further, the distance between the anti-band interference reflector 7 and the large end port of the first pyramidal horn 2 is 0.5×λ S中心频率 , where λ is the wavelength, and the S center frequency is the center frequency of the S band and is 3 GHz.

[0041] Specifically, an anti-band interference reflector 7 is loaded on the periphery of the first pyramidal horn 2, and the installation position of the anti-band interference reflector 7 is near the large end position of the first pyramidal horn 2. At the same time, the distance between the anti-band interference reflector 7 and the large end port of the first pyramidal horn 2 is 0.5λ, where λ refers to the wavelength, and the S center frequency refers to the center frequency of the S band and this center frequency is 3 GHz. That is, a metal reflector is added at a distance of about 0.5λ from the aperture surface around the C-band horn, so as to achieve the purpose of reducing the isolation degree of the common band between the S band and the C band. As Figure 2 shown, there is a band overlap between the S band and the C band, and the feed is a high-power feed. Without using isolators and filters, by adding the anti-band interference reflector 7, the isolation degree of the antenna at the S and C ports is lower than -17 dB.

[0042] Further, the second S-band ridge horn array 42 includes: a third pyramidal horn 8; a third exponential double ridge 9, and the third exponential double ridge 9 is symmetrically arranged on the inner side walls of two opposite wide sides of the third pyramidal horn 8 and is fixed integrally with the third pyramidal horn 8.

[0043] Further, the distance between the second pyramidal horn 5 and the third pyramidal horn 8 is 0.9×λ S中心频率 , where λ is the wavelength, and the S center frequency is the center frequency of the S band and is 3 GHz.

[0044] Further, the second pyramidal horn 5 and the third pyramidal horn 8 have the same parameters.

[0045] Further, the horn radiation port heights of the second pyramidal horn 5 and the third pyramidal horn 8 are both lower than the horn radiation port height of the first pyramidal horn 2.

[0046] Further, the first pyramidal horn 2, the second pyramidal horn 5 and the third pyramidal horn 8 perform microwave signal synthesis through a power dividing and combining network.

[0047] Specifically, the second S-band ridge horn array 42 mainly includes a third pyramidal horn 8 and a third exponential double ridge 9. As described above, for the part where the horn opens, the horn wall design is similar to that of a conventional horn, the ridge opens in an exponential form, and the double ridge structure extends from the waveguide to the pyramidal horn. The outer shape of the third pyramidal horn 8 is a horn shape and is composed of four faces to form a horn shape with different upper and lower opening sizes. Since the two ends of the third pyramidal horn 8 are of different sizes, that is, one end of the third pyramidal horn 8 is a large port and the other end is a small port, and the cross-sectional shapes of the two ports of the third pyramidal horn 8 are both rectangular. Further, on the inner side walls of two wide sides at the large end of the third pyramidal horn 8, the third exponential double ridges 9 are symmetrically installed. At the same time, the installation direction of the third exponential double ridges 9 is the extending direction of the third pyramidal horn 8, that is, the third exponential double ridges 9 are fastened along the height direction of the third pyramidal horn 8 and are thus connected to the wide sides of the third pyramidal horn 8 integrally.

[0048] Furthermore, since the first S-band ridge horn array 41 and the second S-band ridge horn array 42 are symmetrically arranged, the second pyramidal horn 5 and the third pyramidal horn 8 are also symmetrically arranged and have the same parameters, that is, the second pyramidal horn 5 and the third pyramidal horn 8 are equally spaced on both sides of the first pyramidal horn 2. Limited by the structural size of the feed, in order to obtain the optimal performance of each, the feeds of both frequency bands hope to occupy more structural space to obtain the best illumination of energy. Only by optimizing the sizes and element spacings of the horns in both frequency bands can better performance of the dual-band coplanar reflector antenna be achieved. In this embodiment, the spacing between the second pyramidal horn 5 and the third pyramidal horn 8 is 0.9×λ S中心频率 Preferably, as described above, λ refers to the wavelength, and the S center frequency refers to the center frequency of the S band and this center frequency is 3 GHz. The second pyramidal horn 5 and the third pyramidal horn 8 have the same parameters, and the second pyramidal horn 5 and the third pyramidal horn 8 have different parameters from those of the first pyramidal horn 2. In order to make S and C have a consistent phase center, the radiation port height of the C-band horn is set to be higher than that of the S-band horn. That is, the radiation port heights of the second pyramidal horn 5 and the third pyramidal horn 8 are both lower than the radiation port height of the first pyramidal horn 2. The S / C-band high-gain, strong isolation, high-power-resistant broadband feed operates in the S band of 2 GHz to 4 GHz and the C band of 4 GHz to 8 GHz. The feed consists of 3 ultra-wideband horns. The middle horn is an ultra-wideband horn for the high-frequency band (4 GHz to 8 GHz), and the 2 horns on the side are ultra-wideband horns for the low-frequency band (2 GHz to 4 GHz). Microwave signal synthesis is carried out through a power splitting and combining network. That is, the first pyramidal horn 2, the second pyramidal horn 5, and the third pyramidal horn 8 carry out microwave signal synthesis through a power splitting and combining network.

[0049] Furthermore, the S / C-band broadband feed further includes: a first ridge waveguide H-T10, which is disposed at a position close to the small end of the first pyramidal horn 2; and a first waveguide coaxial converter 11, which is connected to the first pyramidal horn 2 through the first ridge waveguide H-T10.

[0050] Specifically, in order to avoid the flange of the S-band ridge horn array, a ridge waveguide H-plane T is added to the rear end of the C-band ridge horn, that is, the first pyramidal horn 2. In other words, the first ridge waveguide H-T10 is installed at the small end position of the first pyramidal horn 2, so that the first waveguide coaxial converter 11 can be connected to the first pyramidal horn 2 through the first ridge waveguide H-T10.

[0051] Furthermore, the S / C band broadband feed also includes: a second waveguide coaxial converter 12 connected to the small end of the second pyramidal horn 5; a third waveguide coaxial converter 13 connected to the small end of the third pyramidal horn 8; and a broadband power divider 14 connected to the second waveguide coaxial converter 12 and the third waveguide coaxial converter 13 through coaxial cables.

[0052] Specifically, the second waveguide coaxial converter 12 and the third waveguide coaxial converter 13 are S-ridge waveguide coaxial converters. Among them, the second waveguide coaxial converter 12 is connected to the small end of the second pyramidal horn 5, and the third waveguide coaxial converter 13 is connected to the small end of the third pyramidal horn 8. Then, the broadband power divider 14 is connected to the second waveguide coaxial converter 12 and the third waveguide coaxial converter 13 through coaxial cables. The S-band waveguide coaxial converter is connected to the end of the S-band ridge horn and is connected to the broadband power divider through a coaxial cable. The excitation uses a coaxial-ridge waveguide converter. The outer conductor of the coaxial cable is connected to the (wide) side of the ridge waveguide, and the inner conductor extends into the opposite ridge to achieve matching, forming a monopole radiator. A rear shorting plate is added to form a rear cavity. By adjusting the distance between the excitation end and the rear shorting plate and the ridge height of the short section, wideband impedance matching is achieved.

[0053] Furthermore, the ridge horn antenna is obtained by gradually increasing the opening of the loaded waveguide with a ridge. Loading the waveguide with a central ridge can widen the available frequency band of the waveguide because it reduces the cut-off frequency of its dominant mode. To achieve wideband operation, a ridge waveguide is used. Due to the effect of the edge capacitance of the ridge, the cut-off frequency of the dominant mode is lower than that of the waveguide without a ridge, while the cut-off frequency of the second dominant mode is higher than that of the waveguide without a ridge, enabling the single-mode operating bandwidth of the ridge waveguide to reach several octaves.

[0054] As Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown in

[0055] One or more of the above technical solutions in the embodiments of the present invention have at least one or more of the following technical effects:

[0056] An S / C band broadband feed provided by an embodiment of the present invention is applied to a dual-reflector ring focus antenna and includes: a C-band ridge horn array, an S-band ridge horn array, and an anti-band interference reflector. Specifically, the C-band ridge horn array includes: a first pyramidal horn and a first exponential dual ridge, wherein the first exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn, and thus is fixed to the first pyramidal horn as a whole. Further, the S-band ridge horn array includes a first S-band ridge horn array and a second S-band ridge horn array, wherein the first S-band ridge horn array and the second S-band ridge horn array are symmetrically arranged with the C-band ridge horn array as the center. The first S-band ridge horn array includes: a second pyramidal horn and a second exponential dual ridge, and the second exponential dual ridge is symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn, and thus is fixed to the second pyramidal horn as a whole; the anti-band interference reflector is arranged on the periphery of the first pyramidal horn near the large end. There is a band overlap between the S band and the C band, and the feed is a high-power feed. Without using isolators and filters, by adding an anti-band interference reflector, the isolation degree of the antenna at the S and C ports is lower than -17 dB, thereby solving the impedance matching problem existing under the condition of ultra-wideband in the prior art, and the technical problem of poor signal isolation degree under the condition of high-power operation when there is no frequency band interval between high and low frequencies, achieving the technical effect of being able to simultaneously realize the ability to transmit high-gain high-power signals in the S / C band without replacing the feed, realizing the coplanar full-band coverage of the S band and the C band, and improving the utilization rate of resources.

[0057] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0058] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A S / C band broadband feed, applied to a dual reflector Cassegrain antenna, characterized in that Comprising: A C-band ridge horn array, the C-band ridge horn array comprising: A first pyramidal horn; A first exponential dual ridge, the first exponential dual ridge symmetrically arranged on the inner side walls of two opposite wide sides of the first pyramidal horn and fixed integrally with the first pyramidal horn; An S-band ridge horn array, the S-band ridge horn array comprising a first S-band ridge horn sub-array and a second S-band ridge horn sub-array, and the first S-band ridge horn sub-array and the second S-band ridge horn sub-array are symmetrically arranged with the C-band ridge horn array as the center, wherein the first S-band ridge horn sub-array comprises: A second pyramidal horn; A second exponential dual ridge, the second exponential dual ridge symmetrically arranged on the inner side walls of two opposite wide sides of the second pyramidal horn and fixed integrally with the second pyramidal horn; The second S-band ridge horn sub-array comprises: A third pyramidal horn; A third exponential dual ridge, the third exponential dual ridge symmetrically arranged on the inner side walls of two opposite wide sides of the third pyramidal horn and fixed integrally with the third pyramidal horn; An anti-band interference reflector, the anti-band interference reflector arranged at the periphery of the first pyramidal horn near the large end; The spacing between the second pyramidal horn and the third pyramidal horn is 0.9×λ S中心频率 , where λ is the wavelength, and the center frequency S is the center frequency of the S band and is 3 GHz; The distance between the anti-band interference reflector and the large-end port of the first horn is 0.5×λ S中心频率 , where λ is the wavelength, and the center frequency of S is the center frequency of the S band and is 3 GHz.

2. The S / C band broadband feed as claimed in claim 1, wherein The second pyramidal horn and the third pyramidal horn have the same parameters.

3. The S / C band broadband feed as claimed in claim 1, wherein The horn radiation port heights of the second pyramidal horn and the third pyramidal horn are both higher than the horn radiation port height of the first pyramidal horn.

4. The S / C band broadband feed as claimed in claim 1, wherein The first pyramidal horn, the second pyramidal horn and the third pyramidal horn perform microwave signal synthesis through a power dividing and combining network.

5. The S / C band broadband feed as claimed in claim 1, wherein The S / C-band broadband feed further comprises: A first ridge waveguide H-T, the first ridge waveguide H-T arranged at a position near the small end of the first pyramidal horn; A first waveguide coaxial converter, the first waveguide coaxial converter connected to the first pyramidal horn through the first ridge waveguide H-T.

6. The S / C band broadband feed as claimed in claim 1, characterized in that, The S / C-band broadband feed further comprises: A second waveguide coaxial converter, the second waveguide coaxial converter connected to the small end of the second pyramidal horn; A third waveguide coaxial converter, the third waveguide coaxial converter connected to the small end of the third pyramidal horn.

7. The S / C band broadband feed as claimed in claim 6, wherein, The S / C-band broadband feed further comprises: A broadband power divider, the broadband power divider connected to the second waveguide coaxial converter and the third waveguide coaxial converter through coaxial cables.

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