Dual band integrated lnb feedhorn system

Abstract

A dual band integrated feedhorn includes a housing having a rotatable support for a C band coaxial waveguide, a clamp for a Ku band waveguide, a Ku band waveguide slideably mounted in the clamp for focus adjustment, and a pair of low noise blocks connected to the waveguide output probes for downconverting their incoming modulated carrier C and Ku band signals to modulated IF signals. A servo drives the support member to position the waveguides energy output coupling probes to match the polarization of the incoming RF energy; thus, eliminating the need for polarizers and reducing insertion loss significantly. The reduced insertion loss enables defocusing of the Ku band waveguide to widen the half power beamwidth to improve aiming accuracy without decreasing the gain and degrading performance. A position adjustable scalar and a pair of power modules are attached exteriorly of the housing. The scalar is positioned adjacent the end of the C band waveguide for focusing the C band waveguide. The power modules include transient suppressors and voltage regulators connected to the pair of low noise blocks for suppressing incoming transients and regulating the incoming dc voltage while outputting the modulated IF carrier signals. Thus, heat generated by the power modules is kept from the low noise blocks, resulting in improved operating performance and increased life.