Temperature-Compensated MIC Filter for Onboard Satellite Regenerators

This paper presents a temperature compensation technique for microwave integrated circuit (MIC) filters that may be employed in the implementation of onboard satellite DQPSK regenerators. These regenerators require extremely stable phase references for demodulation and bit-timing recovery. It has been found that passive temperature compensation can reduce an l8° incremental phase shift caused by a 30°C increase in ambient temperature through a cascade of four l0-pole Butterworth, edge-coupled, MIC filters fabricated on fused silica to within 2°.