Design of an X-band Stripline-fed Co-aperture Microstrip Multilayer Transceiver Array Antenna

摘要

An X-band co-aperture microstrip transceiver array antenna with the same frequency is designed in this paper. The content is as follows. With the purpose to reduce the effect of radiation created by feed network to radiation pattern, the multilayer structure is adopted and the feed network is placed in the lower layer of the antenna. This method can also expand the working bandwidth to some extent. This paper needs a twenty-eight-way power divider. In accordance with the need, a four-way and a seven-way divider are designed and that the prototype is T-type divider. Using metal via feed the patch element is the most straightforward solution and it is available. However, determining the radius and location is a tough progress during the design. Antenna is installed above the cavity components and surrounding environment is metal. Consequently, it is indispensable for power divider to be designed by stripline to adapt the environment. This comprehensively evaluates the effects of metal which is prescient. On the other hand, it is crucial to improve the transceiver isolation. Thus a rectangle slot has been effectively designed in top ground plane and this method do helpful than non-slot structure. At last, an antenna is fabricated and it has been tested and analyzed. The test results are: Antenna working bandwidth is 9.35 GHz～9.85 GHz, E plane beam width is 48°±3°, H plane beam width is 9°± 1°, E plane side lobe level is greater than or equal to 15 dB and H plane side lobe level is greater than or equal to 20 dB. The gain within bandwidth is greater than or equal to 13.65 dB. Transceiver isolation is greater than or equal to 40 dB.