An Efficient Hybrid GO-PWS Algorithm to Analyze Conformal Serrated-Edge Reflectors for Millimeter-Wave Compact Range

Abstract

Abstract-A method to analyze parabolic reflectors with arbitrary piecewise rim is presented in this communication. This kind of reflectors, when operating as collimators in compact range facilities, needs to be large in terms of wavelength. Their analysis is very inefflcient, when it is carried out with fullwave/MoM techniques, and it is not very appropriate for designing with PO techniques. Also, fast GO formulations do not offer enough accuracy to reach performance results. The proposed algorithm is based on a GO-PWS hybrid scheme, using analytical as well as non-analytical formulations. On one side, an analytical treatment of the polygonal rim reflectors is carried out. On the other side, non-analytical calculi are based on efficient operations, such as M 2 order 2-dimensional FFT. A combination of these two techniques in the algorithm ensures real ad-hoc design capabilities, reached through analysis speedup. The purpose of the algorithm is to obtain an optimal conformal serrated-edge reflector design through the analysis of the fleld quality within the quiet zone that it is able to genérate in its forward half space.Index Terms-Compact range, hybrid algorithm, millimeter wave, plañe wave spectrum, serrated edge reflector.

Antenna measurement system operating at W and J millimeter wave bands

“…Amplitude as well as phase cuts of the quiet zone field in several configurations have already been shown in [1,2]. Here, our purpose is to show the optimum reflector design.…”

“…The proposed algorithm, already presented in [1,2], has been used in practice to reach a particular conformal serrated edge configuration. Amplitude as well as field phase information of the quiet zone has been presented.…”

“…Thus, a finite (and small) number of parameters, arranged in a vector Ω=(ω 1 ,...,ω m ) [1] is able to univocally define a particular setup. Each one of the ω i parameters has its particular domain of existence, so a complete design requires a global optimization process over a bounded Ω vector.…”

“…Mathematical formulation, results and validation of the algorithm can be found at [1,2]. The main feature of the algorithm is its analytical treatment of arbitrary-edge parabolic reflectors, in addition with accurate and computational speed.…”

Overview of Novel Post-Processing Techniques to Reduce Uncertainty in Antenna Measurements

“…The proposed CATR approach ensures data robustness both in the sense of quiet zone field planarity and distribution stability. The "Field collimation" block follows the notes drawn in (Muñoz-Acevedo, 2012). Accordingly, the direct wave contribution acquired by the probe is isolated from the stray signals through a time gating technique, which the instrumentation "VNA" must be able to perform.…”