Bandpass filters play a significant role in wireless communication systems. Transmitted
and received signals have to be filtered at a certain center frequency with a specific
bandwidth. The major problem in design microstrip bandpass filter is to get a deeper and
wider rejection bandwidth. In this thesis, a dual mode microstrip open loop resonators
and filter is design to be operated at 5.7 GHz for wireless local area network (WLAN)
using sonnet lite simulation software. Results have been analyzed in terms of reflection
coefficient and transmission coefficient. The simulated filter performances are
presented. The simulated result shows the performance of bandpass is better for
resonator with contact feed compared with non contact feed
