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Design of Miniaturized Wideband Microwave Front End Using Novel Implementation Techniques

The paper presents Microwave front end system architectural design and realization at C-band operating over a wide frequency range of 5.8 GHz to 7.0 GHz. The front end is an integral part of any receiving system. A modular based LNA design, compact planar filter with transmission zeros, wideband mixer with low power LO drive, simple sequential bias circuit with minimum variables to adjust bias, lumped filter for image rejection of 60 dB are the highlights of the front end. The paper focuses on the individual design aspects and features of the circuits, implementations with qualification processes to meet the space quality assurance. The end to end performance of the system at ambient and over temperature extremes is presented. This C-Band front end is assembled with the rest of the receiver to be used for different GEO missions for telecommand purpose.