| 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. |
