一種車載小型移動衛(wèi)星通信天線設(shè)計
[Abstract]:With the rapid development of satellite communication technology, the "moving Communication" system is a system that can carry on the mobile carriers such as cars, trains, aircraft, ships and so on, and can continue to realize two-way communication with the satellite in the course of the carrier motion. It plays an important role in public emergency management, emergency command, information real-time transmission and so on, and has a broad application prospect in the field of military and civil affairs. With the development of the mobile communication system, the mobile satellite communication antenna, which is an important part of the mobile communication system, is undergoing continuous technological innovation. Because the traditional reflector antenna has the advantages of large volume, heavy weight and difficult adjustment, it will not only reduce the maneuverability of the satellite communication platform, but also reduce the mobility of the carrier because the satellite communication platform is too cumbersome to be directly transplanted to the mobile carrier. And because the platform occupies too much volume, it will produce the restrictive problem when the carrier passes through bridges, tunnels and culverts. The flat antenna has the advantages of low profile, small volume, light weight, high efficiency and so on. Therefore, the research of "moving through" antenna has changed from the reflector antenna to the flat antenna. In this paper, a dual polarization, high efficiency, symmetrical pattern, high gain, low profile, small "moving through" flat array antenna is developed for a national defense communication project, and has been applied. The main work and innovation of this paper can be summarized as follows: (1) the advantages and disadvantages of several kinds of "moving through" antennas are compared and analyzed, according to the needs of the project, In this paper, a design scheme of a 4 脳 4 unit small "moving through" flat array antenna is presented. The antenna receiving / transmitting unit shares the same radiator surface. The transceiver feed network is independent. (2) the design of the receiving / transmitting band power distribution / synthesis network is completed. In order to widen the working frequency band, in a limited space, The method of multi-section and single-section impedance matching is adopted. (3) the transition from rectangular waveguide to circular waveguide can be realized by using the theory of multi-step suppression of high order mode. The design of bipolarization orthogonal mode is completed. (4) in order to improve the symmetry of array antenna pattern, we obtain more consistent sidelobe level in each plane. In this paper, a new octagonal horn with more symmetrical pattern than the conventional conical horn is proposed. The gain is improved by setting the angle of the octagonal horn reasonably, and the gate lobe of the array antenna is eliminated when the array cell spacing is too large. The array antenna can obtain acceptable sidelobe level in each plane. (5) the pattern of the array is calculated by using the pattern product theorem, and the performance of the array composed of different array elements is compared and analyzed. The antenna fabrication and field test are completed, and the measured data are analyzed.
【學(xué)位授予單位】:安徽工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TN927.2;TN828.5
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