Design and implementation of UWB band pass filter using modified optimum distributed method for ESM system

This paper presents a design of a microstrip Ultra Wide Band (UWB) Band Pass Filter at 3-12GHz for the Electronic Support Measure (ESM) System. This UWB filter is designed using a modified optimum distributed method, which consist of short-circuited stubs, to meet certain specification. It consists of 10 grounds via hole stub to achieve -60dB rejection at 2GHz with an L-shape to attain the compact size which later be placed inside ESM system module. The filter is simulated using ADS 2011.10 and then fabricated in microstrip using Duroid 5880 substrate. The results of measurement were close to with the results of simulation. The measurement result gave the rejection -60.653dB at 2GHz with insertion loss were about -2.828dB, and the passband cover approximately 3.102GHz-10.926GHz.