A. K. Verma and Nasimuddin


An improved cavity model called the modified Wolff model (MWM) is presented to compute the resonance frequency, input impedance and bandwidth of the circular microstrip antenna on thick substrate (substrate thickness, 0.003ï¬g-0.1ï¬g). The results of MWM show better agreement with the experimental results as compared to the results of three commercial software, including the method of moment (MOM) based Ensemble. The MWM provides deviation in resonance frequency within 1.69 % and deviation in resonant resistance within 17 % against the experimental results.

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A.K. Verma and Z. Rostamy, "Modified Wolff Model for determination of resonance frequency of dielectric covered circular microstrip patch antenna,`` Electronics Letters, Vol. 27, pp. 2234-2236, Nov. 1991.

M. Davidovitz and Y. T. Lo, "Input Impedance of a Probe-fed circular microstrip antenna with thick substrate,`` IEEE Trans. on Antennas and Propagation, Vol. AP-34, No. 7, pp. 905-911, July 1986.

J. S. Dahele and K. F. Lee, "Effect of Substrate Thickness on the performance of Circular- Disk Microstrip Antenna,`` IEEE Trans. on Antennas and Propagation, Vol. AP-31, pp. 358- 360, March 1983.

J. S. Dahele and K. F. Lee, "Theory and Experiment on Microstrip Antenna with air gaps,`` IEE, Proc., Vol.132, Pt. H, pp. 455-460, Dec.1985.

K.R. Carver, "Practical analytical techniques for the microstrip antenna,`` Proc. Workshop on Printed Circuit Antenna Technology, 17-19 Oct.1979, New Mexico State University, Las Cruces, New Mexico, pp. 7-1-20.

S. Yano and A. Ishimaru, "A Theoretical Study of the Input Impedance of a Circular Microstrip Disk Antenna,`` IEEE Trans. on Antennas and Propagation, Vol. AP-29, pp. 77- 83, Jan.1981.

W. C. Chew and J. A. Kong, "Analysis of a circular Microstrip Disk Antenna with a thick Dielectric Substrate,`` IEEE Trans. on Antennas and Propagation, Vol. AP-29, pp. 68-76, Jan.1981.

S. A. Long, L. C. Shen, M. D. Walton and M. R. Allerding, "Impedance of a Circular Disk Printed–Circuit Antenna,`` Electronics Letters, Vol. 14, pp. 684-686, Oct.1978.

Ensemble Version 6.1, Ansoft Co., USA, Sept. 1999.

D. M. Pozar, PCAAD 3.0, Personal Computer Aided Antenna Design, Antenna Design Associates, Inc. 1996.

A. Benalla, C. H. Thng and K. C. GUPTA, Computer-Aided design and analysis of microstrip patch antennas', Micropatch Version 2.0, 1993.

R. Garg, P. Bhartia, I. Bahl, A. Ittipiboon, Microstrip Antenna Design Handbook, Artech House, Inc., 2001, pp. 366.

W. C. Chew, and J. A. Kong, "Effects of fringing fileds on the capacitance of circular microstrip disk,`` IEEE Trans., Microwave Theory Tech., Vol. 26, no. 2, pp. 98-103, 1980.

F. Abboud, J. P. Damiano, and A. Papiernik, "A new model for calculating the input impedance of coax-fed circular microstrip antennas with and without air gaps,`` IEEE Trans. Antennas Propagat., vol. AP-38, pp. 1882-1885, Nov. 1990.

A. K. Verma and A. Bhupal, "Conductor loss of multilayer microstrip line using single layer reduction formulation', Microwave Opt. Technol. Lett., Vol.19, No.1, pp. 20-24, 1998.

R. E. Collin, Antennas and Radiowave propagation, McGraw-Hill, New York, 1985, pp. 273-283.

J. R. James and A. Henderson, and P. Hall "Microstrip antenna performance is determined by substrate constraints,`` MSN, pp. 73-83, August 1982.

D. M. Pozar, "Rigorous closed-form expressions for the surface wave loss of printed antennas,`` Electron. Lett., Vol. 26, No.13, pp. 954-956, 1990.

A. K. Verma and Nasimuddin, "Resonance frequency of rectangular microstrip antenna on thick substrate,`` Electron. Lett, Vol. 37, No. 23, pp. 1373-1374, Nov. 2001.

A. K. Verma and Nasimuddin, "Input Impedance of Rectangular Microstrip Patch Antenna with Iso/Anisotropic Substrate-superstrate,`` IEEE Microwave and Wireless Components Letters, Vol. 11, No. 11, Nov. 2001.


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