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Investigation Into the Polarization of Asymmetrical- Feed Triangular Microstrip Antennas and its Application to Reconfigurable Antennas

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1 Author(s)
Youngje Sung ; Dept. of Electron. Eng., Kyonggi Univ., Suwon, South Korea

A single-feed equilateral-triangular microstrip antenna has been designed with truncated corners for diverse radiation polarizations. The proposed antenna is excited by a microstrip line placed parallel to the oblique side of an equilateral-triangular patch. The antenna exhibits linear polarization (LP), left-hand circular polarization, or right-hand circular polarization (RHCP) depending on whether the three identically sized corners of the triangular patch are cut. A novel reconfigurable microstrip antenna with selectable polarization is proposed based on this first antenna. This second antenna has a simple structure consisting of a corner-truncated triangular patch, a small triangular conductor, an asymmetrical microstrip feed line, and a biased PIN diode between the patch and the triangular conductor. It produces LP or RHCP depending on the bias voltage. The measured results show that this antenna has a low cross-polarization level when operated in the linear state and a good axial ratio in the circular state.

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Antennas and Propagation, IEEE Transactions on  (Volume:58 ,  Issue: 4 )