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Journal of Electromagnetic Waves and Applications Volume 25, 2011 - Issue 17-18
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Articles

Tunable Compact Asymmetric Coplanar Waveguide Zeroth-Order Resonant Antenna

T. Jang Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor 48105, USA
,
S. Lim School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea
&
T. Itoh Department of Electrical Engineering, University of California, Los Angeles, CA 90095, USA
Pages 2379-2388 | Published online: 03 Apr 2012
 
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Abstract

A tunable asymmetric coplanar waveguide (CPW)-type antenna using the 0th order resonance is presented in this paper. The reduction in antenna size is achieved by exploiting the unique zeroth-order resonant (ZOR) property. In order to electronically tune the operating frequency, the varactor diodes are inserted between the shunt chip inductor and ground in the CPW configuration. In addition, a bias network is realised to isolate the antenna from the bias line. By adjusting the reverse bias voltage, the shunt reactance is continuously varied, so that the resonant frequency is tuned. This proposed antenna is electronically tunable from 2.19 GHz to 2.51 GHz. Moreover, good impedance matching is achieved over the desired frequency range.

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