期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 51, 期 9, 页码 2193-2202出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2003.816331
关键词
beam steering; interleaved subarrays; millimeter-wave antennas; phased arrays; subarray overlapping
Design and fabrication aspects of an affordable planar beam steerable antenna array with a simple architecture are considered in this paper. Grouping the elements of a phased array into a number of partially overlapped subarrays and using a single phase shifter for each subarray, generally results in a considerable reduction in array size and manufacturing costs. However, overlapped subarrays require complicated corporate feed networks and array architectures that cannot be easily implemented using planar technologies. In this paper a novel feed network and array architecture for implementing a planar phased array of microstrip antennas is presented that enables the fabrication of low-sidelobe, compact, beam-steerable millimeter-wave arrays and facilitates integration of the RF front-end electronics with the antenna structure. This design uses a combination of series and parallel feeding schemes to achieve the desired array coefficients. The proposed approach is used to design a three-state switched-beam phased array with a scanning width of +/-10degrees. This phased array which is composed of 80 microstrip elements, achieves a gain of > 20 dB, a sidelobe level of < -19 dB and a 10-dB bandwidth of > 6.3 % for all states of the beam. The antenna efficiency is measured at 33-36% in X band. It is shown that the proposed feeding scheme is insensitive to the mutual coupling among the elements.
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