A Low NOISE WIDEBAND MICROWAVE OSCILLATOR USING A TUNABLE MICROSTRIP COMBLINE FILTER

摘要

In RF measurement equipment, microwave synthesized signal sources, broadband digital satellite receivers and many other applications, broadband and low phase noise oscillators are becoming more and more important. A wide tuning range and good phase noise performance have always been assumed to be opposing requirements due to the problem of controlling the loop parameters and the loaded Q of the resonator simultaneously. This article describes a novel design for microwave oscillators using microstrip combline filters in the feedback loop, which can satisfy the needs in microwave engineering for noise, tuning range, harmonic content, manufacturing tolerance and miniaturization.