Gaussian beam and physical optics iteration technique for wideband beam waveguide feed design

Abstract

The Gaussian beam technique has become increasingly popular for wideband beam waveguide (BWG) design. However, it is observed that the Gaussian solution is less accurate for smaller mirrors (approximately < 30A in diameter). Therefore, a high-performance wideband BWG design cannot be achieved by using the Gaussian beam technique alone. This article demonstrates a new design approach by iterating Gaussian beam and BWG parameters simultaneously at various frequencies to obtain a wideband BWG. The result is further improved by comparing it with physical optics results and repeating the iteration.

Solution and Design Technique for Beam Waveguide Antenna System by Using a Parallel Hybrid-Dimensional FDTD Method

“…The antenna system consists of a feed horn, a waveguide and a Cassegrain reflector with large electrical dimension and its total size may reaches several hundred wavelengths. Traditionally, Gaussian beam and physical optics are used to design the antenna system and calculate its far field [3], [4]. Ho wever, the appro ximate treat ment of feed and ignoring diffraction may lead to lower accuracy.…”