The performance of a simple, low-cost, centre-fed, efficient planar array aerial for Q band is described. The microstrip radiating pattern is produced by conventional photolithographic techniques. Gains up to 25 dB with beamwidths of 8° and bandwidths of 500 MHz make this ‘flat’ aerial attractive for many industrial applications where space is limited.
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J. C. Williams (1978) studied this question.