Development of S-Band Preselector

Abstract

This paper describes an S-Band preselector filter developed at Defence Electronics Application Laboratory (Formerly known as Himalayan Radio Propagation Unit) to be used in the front-end of a Troposcatter Communication System. This consists of five resonators tunable over a band of 400 MHz. The filter has a low insertion loss of the order of 1.0 dB at the tuned frequency. The filter was designed to tolerate an equiripple Tchebyscheff response of 0.5 dB over 10 MHz pass band and provide a sharp roll off in the stop band. The rejection in the stop band is more than 100 dB, 100 MHz away from the tuned frequency.

Indexing Terms:

• Microwave Band-pass Filters
• Coaxial Filters
• Preselector