Single-feed circularly polarized microstrip antenna with a slit

Abstract

A new and simple technique for obtaining circular polarization (CP) radiation of a single-feed microstrip antenna is demonstrated. This CP design is achieved by insetting a single slit to the boundary of the microstrip patch, and placing a single feed along an axis 45° to the one containing the slit. Applications of this CP design method to square and circular microstrip antennas have been implemented. Typical experimental results are presented and discussed. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 306–308, 1998.