Stacked dual-band circularly polarized microstrip antenna with small frequency ratio

Abstract

A single feed dual-band circularly polarized stacked microstrip patch antenna with a small frequency ratio is presented. The lower patch is having a pair of peripheral cuts in the circular patch with cross slot loaded at the center and truncated corner square ring is used as the parasitic patch. The frequency ratio of dual-band achieved is 1.05. The 3-dB axial ratio bandwidth is 1.4% for the upper band and 1.1% for the lower band. Proposed structure is fabricated on the FR-4 epoxy substrate and fed by SMA connector. The measured results are in good agreement with the simulated. The antenna shows stable radiation characteristics for both the operating bands. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1933–1937, 2014