Abstract

In this paper, the linear polarization switchable patch array antenna is proposed and the characteristics of the proposed antenna are investigated experimentally. The proposed antenna consists of a fed patch element and four parasitic patch elements. The fed element has a cross slot at the center of the patch and four switching diodes are embedded in a star form across the slot. The parasitic elements are around the fed element in order to enhance the gain. When the positive voltage is applied to the proposed patch array antenna, the main polarization angle is tilted to −45deg. When the polarity of the bias voltage applied to the diodes is reversed, the condition of the diodes is changed, and the main polarization angle is tilted to +45deg. Consequently, the proposed patch array antenna can radiate and switch two orthogonal polarizations by the polarity of bias voltage for the diodes. Using the parasitic array technology, the gain of the proposed patch array antenna can be increased than that of single patch antenna. The proposed patch array antenna is practically attractive for the wireless communications systems in the near future.

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