Abstract
AbstractA novel circular polarization (CP) reconfigurable antenna is proposed. The CP antenna consists of two folded off‐center‐driven dipoles. By switching four PIN diodes in the off‐center‐driven dipoles, the senses of CP can be changed between the left‐handed CP and the right‐handed CP. Two parasitic rectangular loops are added to the folded off‐center‐driven dipoles to improve the bandwidth. A T‐shaped microstrip probe line is used to feed the antenna. Experimental results show that the CP reconfigurable antenna achieves an impedance bandwidth of 31% (2.05–2.8 GHz) for return los >10 dB and a CP bandwidth of 16% (2.3–2.7 GHz) for axial ratio <3 dB. The measured gain of the CP reconfigurable antenna is about 7 dBi.
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