MICROSTRIP ANTENNA

摘要

A patch array microwave antenna comprising spaced sub-arrays each consisting of a fed patch (1) and at least a pair of parasitic patches (3a, 3b) fed from the non radiative (as herein defined) edges of the fed patch (1); in a second embodiment a second pair of parasitic patches (3c, 3d) fed from the radiative edges are also provided, so as to form a five-member cross. Spacings between patches in a group are kept to below lambda /15, and groups are spaced apart by at least double this. Intergroup distances P are kept below 2 lambda , but may be greater than lambda if alternate lines of patches are staggered by P/2 so no on-axis diffraction lobes appear in the radiation pattern.