Phani kumar TVB, Nagraju N, Santhosh Kumar Ch
The microwave filter is a component which provides frequency selectivity in mobile, radar, satellite communication systems operating at microwave frequency. Microwave low pass filter suppress unwanted harmonic components above cut off frequency. Because of the distributed circuit elemental nature of the lumped components at microwave frequency, distributed lines like microstrip, striplines etc. are used as microwave low pass filter components. For stepped impedance filter design high and low impedance lines are used. This paper describes designing of Butterworth approximated stepped impedance low pass filter at 1.2 GHz with microstrip line implementation. Designed filter is simulated using Advanced Design System (ADS) software and is fabricated with photolithographic technique. The designed microwave component is tested with Rhode & Schwartz Network Analyzer and practical results are agreed with simulated one.
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