12 GHz band satellite broadcasting receiver with direct converting system

The results of analyses of a satellite broadcasting receiver in terms of the electrical design, construction costs, and the inclusion of low cost semiconductors and other materials are presented. The total system cost is discussed as a function of the S/N ratio and the threshold level, considering an outdoor antenna under 1 m. Low noise is explored with respect to an image recoverer converter with an optimized design, a low loss circuit, and a low noise IF amplifier. Design factors for a wide band capability include a mixer diode with a small junction capacitance, the effects of image impedance, and a matching circuit between the down converter and an IF amplifier. A low-cost approach to mass production is described.