Abstract-Stacked microstrip antennas deserve special attention due to their advantageous properties like dual frequency operation and wide bandwidth. In the present communication a theoretical model for single stacked microstrip disc antenna is proposed using extended cavity model. The method of analysis by this model is easier and intuitive than the full wave analysis. Single stacked microstrip disc antenna with co-axial feed locations at different radial positions is analyzed with this model taking different ratios of patch sizes. Antenna properties like return loss, input impedance, gain and radiation efficiency are calculated with the proposed model different cases and compared with the simulated and experimental results. The results are in fairly good agreement.

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In this article a new method of computation of input impedance of a probe‐fed ring resonator is presented. The method utilizes both cavity model and circuit theory to accurately predict the impedance of a high Q‐dominant mode resonance. Apart from accurate, this method can be generalized to predict impedance of first few modes of a probe‐fed ring resonator to reasonable accuracy. The computed result is compared with previously published data for TM12 mode and discrepancies observed are listed. The method is also used to compute impedance for first few modes. For dominant mode, the numerical results are compared with IE3D results, which is a commercially available software based on method of moments. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1681–1684, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22518

A new method for impedance of an annular patch loaded by multiple posts is presented using extended cavity model. The post is loaded away from the centre of the ring. The input impedance for dominant mode is calculated with this method and compared with the measured and simulated results. For the simulation IE3D software is used based on method of moment. Downloaded by [Michigan State University] at 09:57 26 December 2014 1334 Mahajan et al.

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