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Journal Article
Frequency-Tunable Waveguide Antenna With Miniaturized Aperture Using a Varactor-Loaded Split-Ring Resonator
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- Authors
- Wook-Ki Park, Soon-Soo Oh, Young-Hwan Lee, Hyo-Dal Park
- Issue Date
- 2011-01
- Citation
- IEEE Antennas and Wireless Propagation Letters, v.9, pp.1233-1236
- ISSN
- 1536-1225
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- We propose a frequency-tunable waveguide antenna with a size-reduced aperture. Up to now, waveguide antennas with split-ring resonators have exhibited narrow-frequency bandwidths. To expand the operating frequency band, the resonant frequency of a split-ring resonator is tuned by adjusting the capacitance of the gap. A capacitor-loaded split-ring resonator is simulated and experimentally tested to validate its performance, and a varactor-loaded split-ring resonator is then investigated. The effective capacitance of the varactor-loaded split-ring resonator is changed by varying the external dc voltage. The tunable frequency range extends from 1.96 to 2.36 GHz (a fractional frequency range of 18.5%). The simulations and experiments yield good results for the reflection coefficient, radiation pattern, and gain. The proposed antenna retains the 70% aperture reduction of previously developed split-ring-resonator-loaded waveguide antennas. © 2011 IEEE.
- KSP Keywords
- 6 GHz, DC voltage, Effective capacitance, Fractional frequency, Frequency range, Operating frequency, Resonant Frequency, Tunable waveguide, frequency band, frequency-tunable, radiation pattern(RP)