Compact pentagon microstrip antenna with circular polarization

By embedding a group of four bent slots in the equilateral-pentagon patch a nd introducing a peripheral cut at the patch boundary, a compact pentagon m icrostrip antenna with circularly polarized (CP) operation can be implement ed using a probe feed. Results have been obtained that, for a given operati on frequency, the antenna size reduction of the proposed design can be as l arge as 41% as compared to the regular-size CP equilateral-pentagon microst rip antenna. Details of the design considerations are described, and measur ed CP characteristics are presented. (C) 2001 John Wiley & Sons. Inc. Micro wave Opt Technol Lett 30: 370-372, 2001.