A 22GHz Band Low Noise Down Converter for Satellite Broadcast Receivers

A simple, low-cost and high-performance 22GHz band down converter has been developed for the direct-to-home satellite broadcasting system in the future. The newly developed down converter consists of a low noise HEMT preamplifier, an image recovery mixer with novel structure using dielectric resonator filters, a 21.4 GHz GaAs FET oscillator stabilized by a dielectric resonator and an IF amplifier. These components are fully integrated with MIC technology into a small size. A total noise figure of less than 2.8 dB is obtained over the 22.5 to 23.0 GHz frequency range. The local oscillator has achieved a frequency variation of less than 600 kHzp-p over a ¿20 to +60°C temperature range.