Amel Boufrioua

Bio: Amel Boufrioua is an academic researcher. The author has contributed to research in topics: Microstrip & Patch antenna. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Analysis of a Rectangular Microstrip Antenna on a Uniaxial Substrate

Abstract: Over the past years microstrip resonators have been widely used in the range of microwave frequencies. In general these structures are poor radiators, but by proper design the radiation performance can be improved and these structures can be used as antenna elements (Damiano & Papiernik, 1994). In recent years microstrip patch antennas became one of the most popular antenna types for use in aerospace vehicles, telemetry and satellite communication. These antennas consist of a radiating metallic patch on one side of a thin, non conducting, supporting substrate panel with a ground plane on the other side of the panel. For the analysis and the design of microstrip antennas there have been several techniques developed (Damiano & Papiernik, 1994; Mirshekar-Syahkal, 1990). The spectral domain approach is extensively used in microstrip analysis and design (Mirshekar-Syahkal, 1990). In such an approach, the spectral dyadic Green’s function relates the tangential electric fields and currents at various conductor planes. It is found that the substrate permittivity is a very important factor to be determined in microstrip antenna designs. Moreover the study of anisotropic substrates is of interest, many practical substrates have a significant amount of anisotropy that can affect the performance of printed circuits and antennas, and thus accurate characterization and design must account for this effect (Bhartia et al. 1991). It is found that the use of such materials may have a beneficial effect on circuit or antenna (Bhartia et al. 1991; Pozar, 1987). For a rigorous solution to the problem of a rectangular microstrip antenna, which is the most widely used configuration because its shape readily allows theoretical analysis, Galerkin’s method is employed in the spectral domain with two sets of patch current expansions. One set is based on the complete set of orthogonal modes of the magnetic cavity, and the other employs Chebyshev polynomials with the proper edge condition for the patch currents (Tulintsef et al. 1991). This chapter describes spectral domain analyses of a rectangular microstrip patch antenna that contains isotropic or anisotropic substrates in which entire domain basis functions are used to model the patch current, we will present the effect of uniaxial anisotropy on the characterization of a rectangular microstrip patch antenna, also because there has been very little work on the scattering radar cross section of printed antennas in the literature, including the effect of a uniaxial anisotropic substrate, a number of results pertaining to this case will be presented in this chapter.

Uniaxial Anisotropic Substrate Effects on the Resonance of an Equitriangular Microstrip Patch Antenna

Abstract: Using a new combined approach, the efiect of the uniaxial anisotropic dielectrics on the resonant frequency and radiation fleld of an equitriangular patch antenna is presented in this paper. The problem is analysed in the spectral domain using the moment method and an electric fleld integral equation combined with a mathematical approach. However, the dyadic Green's functions corresponding to the proposed structure are separately developed and the Fourier transform of the basis current components are calculated mathematically using \the reference element" method. Numerical results show that the change in the resonant frequency and the radiation patterns of the antenna is due primarily to a small disturbance of the substrate's nature. Then the efiect of the uniaxial anisotropic materials is a signiflcant parameter and most essential on the microstrip antenna characterization.

Characterization of Superstrate-Loaded Resistive Rectangular Patch Antenna

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.

Rigorous computation of a compact square patch antenna with notches using the moment method

Abstract: A new rigorous computation of a square microstrip patch antenna with dual square notches at the two corners of the diagonal using Galerkin’s method in the spectral domain is presented; the dyadic Green’s functions of the problem are well resolved by the (TM, TE) representation. The spectral domain formulation of this square patch antenna with square notches for circular polarization and printed on an isotropic substrate is developed and calculated based on the study of a simple square patch antenna. Comparisons of the left hand circular polarization (LHCP) and right hand circular polarization (RHCP) patterns at various planes with different frequencies are also presented. Moreover, the effect of some parameters on the radiation characteristics of this proposed square patch with square notches has been investigated. The proposed structure is attractive and do not require exterior circuitry or large space compared to other designs that impose stacked multilayer configurations or a complex matching system to create circular polarization. Furthermore, this proposed structure exhibits the advantage of the simplicity of the design which needs only the cutting of two identical squares at the two opposite edges of the square patch, and; hence, requires only the same dimensions of the square notches at two corners of the diagonal to be determined.