SUMMARYIn this paper, a rigorous analysis of the tunable circular microstrip patch is performed using a dyadic Green's function formulation. To make the theoretical formulation more general and hence valid for various antennas structures (not only limited to tunable microstrip patch); the dyadic Green's function is derived when the patch is assumed to be embedded in a multilayered dielectric substrate. A very e cient technique to derive the dyadic Green's function in the vector Hankel transform domain is proposed. Using the vector Hankel transform, the mixed boundary value problem is reduced to a set of vector dual integral equations. Galerkin's method is then applied to solve the integral equation where two sets of disk current expansions are used. One set is based on the complete set of orthogonal modes of the magnetic cavity, and the other consists of combinations of Chebyshev polynomials with weighting factors to incorporate the edge condition. Convergent results for these two sets of disk current expansions are obtained with a small number of basis functions. The calculated resonant frequencies and quality factors are compared with experimental data and shown to be in good agreement. Finally, numerical results for the air gap tuning e ect on the resonant frequency and half-power bandwidth are also presented.
A single neural network is developed to model the resonant frequency of rectangular patch printed on uniaxially anisotropic substrate with air gap using effective parameters in conjunction with spectral dyadic Green's function. Also, the strength of ANN models in antenna design is demonstrated by considering two case studies: the design of circular patch antenna and planar inverted-F antenna. Results show good agreement with literature. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 21:228-233, 2011.
. Improving the performances of a high Tc superconducting circular microstrip antenna with multilayered configuration and anisotropic dielectrics. Progress In Electromagnetics Research, EMW Publishing, 2010, vol. 18, pp 169-183. Progress In Electromagnetics Research C, Vol. 18, 169-183, 2011 IMPROVING Abstract-The moment method technique has been improved to investigate the scattering properties of high T c superconducting circular antennas with anisotropic substrate in multi-layered configuration. In this method, the electric field integral equation for a current element on a grounded dielectric slab of infinite extent was developed by basis functions involving Chebyshev polynomials. An improved analytical model is presented taking into account anisotropic substrate, superconducting material for the circular patch and multilayered structure. To validate the theoretical results, an experimental study has been performed for a perfectly conducting circular patch on a single layer, with and without air gap. Good agreements were obtained between our theory and measurements. Effects of temperature and thickness of a superconducting film are also reported and discussed. The performances of high T c superconducting circular antennas were improved by the use of uniaxial anisotropy substrate and multilayer configuration.
SUMMARYIn this paper, a rigorous full-wave analysis of rectangular microstrip patches over ground planes with rectangular apertures in substrates containing isotropic and anisotropic materials is presented. The dyadic Green's functions of the problem are e ciently determined in the vector Fourier transform domain. The integral equations for the unknown patch current and aperture ÿeld are solved numerically by applying the Galerkin method of moments. The TM set of modes issued from the magnetic wall cavity model are used to expand the unknown current on the patch. Also, the same basis functions are used for approximating the aperture ÿeld in accordance with the concept of complementary electromagnetic structures. The validity of the solution is tested by comparison of the computed results with experimental data. Numerical results show that changes in aperture length can drastically shift the resonant frequency. The aperture width, on the other hand, can be used for a ÿne adjustment of the operating frequency. Other results also indicate that dielectric anisotropy e ect is especially signiÿcant when the size of the aperture is similar to that of the patch.
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