volume | PIER Journals

2006-02-20

Design of Compact Reconfigurable Dual Frequency Microstrip Antennas Using Varactor Diodes

S. Shynu,

Dr. S. Shynu

Department of Electronics

Cochin University of Science and Technology

India

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Gijo Augustin,

Dr. Gijo Augustin

Energy Materials and Telecommunication

National Institute of Scientific Research (INRS)

Canada

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Chandroth K. Aanandan,

Dr. Chandroth K. Aanandan

Department of Electronics

Cochin University of Science and Technology

India

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Pezholil Mohanan,

Professor Pezholil Mohanan

Department of Electronics

Cochin University of Science & Technology

India

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Kesavath Vasudevan

Professor Kesavath Vasudevan

Department of Electronics

Cochin University of Science & Technology

India

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, Vol. 60, 197-205, 2006

doi:10.2528/PIER05120101 | Google Scholar

Abstract

The design of a compact, single feed, dual frequency dual polarized and electronically reconfigurable microstrip antenna is presented in this paper. A square patch loaded with a hexagonal slot having extended slot arms constitutes the fundamental structure of the antenna. The tuning of the two resonant frequencies is realized by varying the effective electrical length of the slot arms by embedding varactor diodes across the slots. A high tuning range of 34.43% (1.037-1.394 GHz) and 9.27% (1.359-1.485 GHz) is achieved for the two operating frequencies respectively, when the bias voltage is varied from 0 to -30 V. The salient feature of this design is that it uses no matching networks even though the resonant frequencies are tuned in a wide range with good matching below -10 dB. The antenna has an added advantage of size reduction up to 80.11% and 65.69% for the two operating frequencies compared to conventional rectangular patches.

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S. Shynu, Gijo Augustin, Chandroth K. Aanandan, Pezholil Mohanan, and Kesavath Vasudevan, "Design of Compact Reconfigurable Dual Frequency Microstrip Antennas Using Varactor Diodes," , Vol. 60, 197-205, 2006.
doi:10.2528/PIER05120101

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