| 摘要 |
A dual band integrated feedhorn (16) includes a housing (36) having a rotatable support (66) for a C band coaxial waveguide (72), a clamp (81) for a Ku band waveguide (78), a Ku band waveguide (78) slidably mounted in the clamp (81) for focus adjustment, and a pair of low noise blocks (18) connected to the waveguide output probes (70, 82) for downconverting their incoming modulated carrier C and Ku band signals to modulated IF signals. A servo (48) drives the support member to position the waveguide's energy output coupling probes (70, 82) 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 (78) to widen the half power beamwidth to improve aiming accuracy without decreasing the gain and degrading performance. A position adjustable scalar (84) and a pair of power modules (28) are attached exteriorly of the housing. The scalar (84) is positioned adjacent the end of the C band waveguide (72) for focusing the C band waveguide (72). The power modules (28) include transient suppressors and voltage regulators connected to the pair of low noise blocks (18) for suppressing incoming transients and regulating the incoming dc voltage while outputting the modulated IF carrier signals. Thus, heat generated by the power modules (28) is kept from the low noise blocks (18), resulting in improved operating performance and increased life. |
