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Performance of probe-fed microstrip-patch element phased arrays

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3 Author(s)
C. -C. Liu ; Polytech. Univ., Farmingdale, NY, USA ; A. Hessel ; J. Shmoys

The performance trends for large phased arrays with probe-fed microstrip-patch elements are discussed, with primary consideration given to single-probe (unbalanced) feed for rectangular grid arrays with rectangular patch geometry. The effects of substrate thickness and permittivity, patch dimensions, and element spacing are examined. Pronounced surface- and leaky-wave effects that tend to limit the scan volume are found. Interaction between the patch resonance at broadside scan and the leaky-wave resonances leads to an E-plane scan-bandwidth tradeoff. In the H-plane scan a transverse electric (TE)-type guided wave resonance is found that becomes pronounced when the H-plane dimension is a large fraction of the H-plane element spacing. This leads to a limitation of the H-plane patch dimension in the rectangular grid arrays. An element design procedure is proposed and illustrated for an element suitable for wide-angle scan over a ±5% frequency band

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IEEE Transactions on Antennas and Propagation  (Volume:36 ,  Issue: 11 )