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| Progress In Electromagnetics Research | ISSN: 1070-4698, E-ISSN: 1559-8985 |
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LOADED MICROSTRIP DISK RESONATOR EXHIBITS ULTRA-LOW FREQUENCY RESONANCEBy T. Chakravarty, S. M. Roy, S. K. Sanyal, and A. DeAbstract: In this paper a novel method of generation of ultra-low resonance in a microstrip disk resonator is presented. The disk resonator is loaded with series L-C circuit across a selective location in the disk via a thin shorting pin. It is shown that in loaded disk resonator, the lowest resonance observed is in VHF range whereas the unloaded disk had a fundamental resonance at 1.76 GHz. This resonance is slightly offset from the series resonant frequency of L-C circuit. and it depends on the disk radius as well. Using IE3D, a commercial MoM solver, the said structure is simulated. The experimental results agree well with the simulated results. A closed form expression for computing the resonant frequency is given.
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References:
2. Majumdar, A., T. Chakravarty, S. Saran, and S. K. Sanyal, "A novel technique to implement frequency hopping planar antennas with a computer interface," Microw. and Optical Tech. Letters, Vol. 38, 270-274, 2003. 3. Chakravarty, T., S. K. Sanyal, and A. De, "Compact and tunable circular microstrip patch using post-varactor loading," IETE Tech. Review, Vol. 18, 153-157, 2001.
4. Chakravarty, T. and A. De, "Resonant frequency of a shorted circular patch with the use of a modified impedance expression for a metallic post," Microw. and Optical Tech. Letters, Vol. 33, No. 4, 252-256, 2002. |