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Reconfigurable dual-band patch antenna using varactor-loaded slot

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4 Author(s)
Khidre, A. ; Electr. Eng. Dept., Univ. of Mississippi, Oxford, MS, USA ; Xiao Liu ; Fan Yang ; Elsherbeni, A.Z.

This paper introduces a new approach to design a microstrip patch antenna with reconfigurable dual band operation. Dual-band is achieved by the placement of a lumped capacitor on a slotted patch antenna, and the two resonant frequencies and their ratio are function of the capacitance value. Consequently, tuning of both frequencies is allowed by choosing proper capacitor value. If a varactor with an appropriate biasing network is used instead, electronic tuning is attained by changing the applied DC voltage. To understand the dual resonance behavior of the proposed antenna, a transmission line (TL) model with the wheeler incremental volume concept is established and validated with full wave simulation. The antenna shows 1.35-1.73 tunable frequency ratio with 0.5-1.1 pF capacitance. Moreover, the radiation patterns are similar at both bands.

Published in:

Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE

Date of Conference:

8-14 July 2012