Abstract

Novel circular polarization (CP) antenna using microstrip line and eccentric annular ring slot is presented. To form the CP radiation, a circular patch is loaded in the slot. Specific parameters of the added circular patch can independently control CP performance or CP center frequency, making a CP antenna with certain frequency specification and CP performance can be easily designed. Fabrication and measurement, which shows impedance bandwidth is up to 66.8% (2860 MHz) and 3-dB axial ratio bandwidth is up to 11.9% (510 MHz) for the proposed antenna, are carried out to validate the wideband CP.

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