Abstract
The scattering radar cross section (RCS) of a superstrate loaded resistive rectangular microstrip patch which is printed on isotropic or uniaxial anisotropic substrate are investigated, where an accurate design based on the moment method technique in the spectral domain is developed. Entire domain sinusoid basis functions without edge condition and roof top sub-domain basis functions are introduced to expand the unknown current on the metal patches. The integral equation includes a superstrate resistive boundary condition on the surface of the patch and the effects of anisotropic substrate are developed. The necessary terms for representing the surface resistance on the patch were derived and were included in the equation in the form of a resistance matrix. Comparative study between our results and those available in the literature is done and showed a very good agreement.
Highlights
Microstrip antennas have been widely used in the range of microwave frequencies over the past twenty five years and are extensively used in various communication systems due to their compactness, economical efficiency, light weight, low profile and conformability to any structure
The study of the superstrate layer is of interest, it can affect the performance of printed circuits and antennas and may prove beneficial or detrimental to the radiation characteristics, depending on the thicknesses of the substrate and superstrate layer, as well as relative dielectric constants [1]
In this paper we extend our study [2, 3] to the case of a superstrate-loaded resistive rectangular microstrip structure, where the superstrate layer loaded on the microstrip structure is often used to protect printed circuit antennas from environmental hazards, or may be naturally formed during flight or severe weather conditions [1, 4]
Summary
Microstrip antennas have been widely used in the range of microwave frequencies over the past twenty five years and are extensively used in various communication systems due to their compactness, economical efficiency, light weight, low profile and conformability to any structure. The full-wave moment method has been applied extensively and is a standard approach for analysis of microstrip geometry [1,2,3,4] In such approach, the spectral dyadic Green’s function which relates the tangential electric fields and currents is developed. Using this type of boundary condition, several authors have examined the scattering response of resistive strips and tapered resistive strips This approach has been used in order to study frequency selective surfaces [9]. This paper will describe spectral domain analysis of superstrate-loaded imperfectly conducting microstrip patch antennas printed on isotropic or uniaxial anisotropic substrate by using entire domain sinusoid basis functions without edge condition and roof top sub-domain basis functions to model the patch current density. A novel proposed structure pertaining to this case will be presented in this paper
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