Software-defined radio (SDR) is the application of software-based signal processing to wireless communication systems. Integral to most SDR applications is the RF front end, which performs amplification and frequency conversion. The RF front end bridges the gap between baseband signals and carrier frequencies suitable for propagation. A printed circuit board design for an RF front end has been modified and fabricated for use in an SDR communication system. The design extends the operating frequency range of an existing SDR by converting to an intermediate frequency. Phase-shift keying modulation and orthogonal frequency-division multiplexing have been implemented in GNU Radio software and applied to the system. The design of the RF front end and its coplanar waveguide traces, and the system performance for several test cases, are presented
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