Feed System Design

The chapter describes the design of aperture-type feeds by using waveguide components. Starting with an example satellite link, both linearly and circularly polarized feeds for single and dual polarized for receive-only or receive-and-transmit are presented. Waveguide feed networks include filters, orthomode transducers, phase shifters, septum polarizers, and quadrature junctions (QJ) in various configurations to achieve single and multiple frequency band operation. Discussions of properties such as VSWR (voltage standing wave ratio), port-to-port isolation, polarization discrimination, insertion loss, and signal time delay complete the chapter.