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Compact design of a planar filtering antenna array including a frequency selective common-mode rejection module

A new compact design of a planar phased-array antenna with inherent frequency selectivity properties is presented. In previous works, starting from an array of connected dipoles, the design of a filtenna structure and a strategy for the suppression of common-mode resonances have been addressed. In the present approach, a compact design solution has been obtained by the integration of part of the filtering function in the common-mode rejection module, consisting in a planar hybridring. As proved by simulation results, scanning up to 45° for the H-plane and up to 30° for the E-plane is achieved with a relative bandwidth of 21%.