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Double frequency feed source

A feed and frequency band technology, applied in the field of antennas, can solve the problems of rising side lobes of the pattern, the beam equalization is not well solved, reducing the irradiation efficiency of the feed, etc., to achieve the effect of reducing mutual influence

Active Publication Date: 2012-03-28
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

In addition, some studies have shown that when the coaxial aperture becomes larger to a certain extent, the side lobe of the pattern will rise sharply, which reduces the irradiation efficiency of the feed source
[0004] Based on the above reasons, when the coaxial feed is used as the feed of the dual-reflector antenna, the beam equalization under the large aperture has not been well resolved.

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Embodiment Construction

[0029] Such as figure 1 Shown is a schematic diagram of a ring-focus dual-reflector antenna. The ring-focus dual-reflector antenna consists of a main reflector 1 , a secondary reflector 2 , and a feed 3 . The main reflector 1 and the sub-reflector 2 are formed by rotating a part of a parabola and an ellipse respectively around the antenna axis. The feed source phase center is located at the focal point of the ellipse of the sub-reflector on the antenna axis, and the electromagnetic wave radiated from the feed irradiates the sub-reflector. And the secondary reflector irradiates the main reflector, and finally radiates out from the main reflector. The feed source is a key component of the antenna, which directly affects the electrical performance of the entire antenna. In order to maximize the efficiency of the reflector antenna, the feed source must have a suitable secondary anti-edge irradiation taper level and a small phase fluctuation within the irradiation angle. In gener...

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Abstract

The invention relates to a double frequency feed source, which is applied to a ring-focus double-reflector antenna and works in S and X frequency bands. The S / X double frequency feed source adopts a way that a coaxial horn is nested, S frequency band is a coaxial horn, X frequency band is a five-section variable field angle multimode horn and is taken as an inner conductor of the S frequency bandcoaxial horn. By applying the double frequency feed source provided by the invention, the problems of wave beam equalization and impedance matching of the coaxial horn under a heavy calibre conditionare creatively solved, the double frequency feed source has the same illumination taper in the S frequency band and the X frequency band, the illumination taper at the temperature of 40 DEG C is minus 10dB to minus 13dB, an almost straight phase center is located in the two frequency bands, and efficiencies in the S frequency band and the X frequency band respectively reach up to 45% and 65%, thus the double frequency feed source provided by the invention is a high-efficiency double frequency feed source.

Description

technical field [0001] The invention relates to a dual-frequency feed source, which is applied to a ring-focus double-reflection surface antenna, can work in S frequency band and X frequency band, and belongs to the field of antennas. Background technique [0002] In the 1970s, Kraus and Profera et al. studied the radiation characteristics and beam equalization of coaxial waveguides, and found that adding a radial reactance diaphragm to the coaxial radiation port can achieve beam equalization and reduce side lobes. Trevor S.Bird and others studied the impedance matching of coaxial feeds, and proposed a method to realize broadband matching of coaxial feeds. The above research laid the theoretical foundation for coaxial feeds. Since the coaxial feed can realize dual-frequency or multi-frequency sharing through nesting, there have been many practical applications of the coaxial feed since then, and the methods of beam equalization of the coaxial feed have also been diversified....

Claims

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Application Information

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IPC IPC(8): H01Q13/02H01Q19/19H01Q5/00H01Q5/22
Inventor 敬红勇柏宏武薛兆璇
Owner XIAN INSTITUE OF SPACE RADIO TECH
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