COMPACT CIRCULARLY-POLARIZED MICROSTRIP ANTENNA WITH BENT SLOTS

By embedding a group of four bent slots in a corner-truncated square m icrostrip patch, a single-feed compact circularly polarised microstrip antenna can easily be obtained. Results show that, for a given circul ar polarisation (CP) operation, the proposed antenna can have an anten na size reduction of more than 50% as compared to the conventional CP design using a comer-truncated square patch without the slots. Moreove r, the 50 Omega feed position and truncated-corner size for achieving CP operation are found to be nearly independent of the bent slots intr oduced in the patch, which makes the proposed antenna easy to implemen t.