Abstract
This paper presented a theoretical and numerical assessment for nonidentical segmented exponential- (NISE-) convex and NISE-concave serrated plane CATRs by changing number of serrations. The investigation was based on diffraction theory and, more specifically, on the diffraction formulation of Fresnel. The compact antenna test range (CATR) provides uniform illumination within the Fresnel region to the test antenna. Application of serrated edges has been shown to be a good method to control diffraction at the edges of the reflectors. In this paper, the Fresnel fields of NISE-convex and NISE-concave serrated CATRs are analyzed using physical optics (PO) technique. The PO analysis is applied in this paper for plane reflector serrated CATR only. The same analysis is applied to any type of reflector. In this paper, lens-based reflector is not considered. It is observed that NISE-concave serrated CATR gives less ripple and enhanced quiet zone width than NISE-convex.
Highlights
The compact antenna test range (CATR) provides a relatively new method of measuring the far-field characteristics of microwave antennas
This paper presents a gist of the analysis of nonidentical segmented exponential- (NISE-)convex and NISE-concave geometries shown in Figures 1 and 3
The relative power in dB versus transverse distance in wavelengths with the space constant ai = 0.6 for exponential serrations is presented for different cases in Figures (5–7)
Summary
The CATR provides a relatively new method of measuring the far-field characteristics of microwave antennas. Since the electromagnetic fields must be smooth and continuous, there will be strong diffracted field emanating from the terminating edges This field interferes constructively and destructively with the plane wave causing amplitude and phase variations of the field illuminating the test antenna or scattering body and degrades the performance of the range. This diffracted signal is one of the major contributions limiting the use of the compact ranges. The serrated edge termination is intended to form a transition between the reflector surface and free space In performing this function, it is designed to diffract energy away from the target zone. It has been shown theoretically that the application of serrations minimizes distorting diffraction effects in the Fresnel region of a CATR [1, 2]
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