Design of S-Band RF-Front End for Doppler Weather Radars

This paper describes the design & development of a RF Front End module that operates in S Band. The RF Front End module is situated in the receive section of the Doppler Weather Radar, it down converts the S band input signal to IF for next level signal processing. Bandwidth of operation is 300MHz. Image rejections are achieved using Image Rejection Mixer and filters. The module has a gain of 31dB, Noise Figure of 2dB (Max.) & an excellent dynamic range from −10dBm to −110dBm. The module is light weight and is designed to operate over temperature range of +55°C to −10°C.