Compact circularly-polarised circular microstrip antenna with cross-slot and peripheral cuts

Novel compact circular-polarisation (CP) operation of a circular microstrip antenna, with a cross-slot in the patch centre and a pair of peripheral cuts at opposite sides of the patch boundary, is proposed and experimentally studied. For operation at a fixed frequency, the proposed antenna using a single probe feed, can have an antenna size reduction of /spl sim/20% as compared to regular size CP operation of a circular microstrip antenna. Details of the experimental results are presented and analysed.