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Slot-perturbed microstrip antenna for switchable circular polarisation

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3 Author(s)
S. Pyo ; Radio Technology Research Department, Electronics and Telecommunications Research Institute ; J. -w. Baik ; Y. -s. Kim

A new microstrip antenna using a slot perturbing method is proposed for switchable circular polarisation. The perturbing structure consists of a centred circular slot with an inner conductor and an outer slot in the square patch radiator. By switching the perturbation geometry from controlling the states of two pin diodes, right-hand circular polarisation and left-hand circular polarisation are alternated without a resonant frequency shifting. Simulated and measured results show that the proposed antenna has remarkable circular polarisation performance with symmetrical radiation characteristics at the resonant frequency.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 10 )