Design Techniques used in Microstrip Tri-Band Bandpass Filter

Abstract

Band pass filters play a significant role in the front end of microwave and radio engineering. The rapid progress in wireless communication system has led to an increasing demand for band pass filters with light weight, small size and low loss. Microstrip band pass filters satisfy all these requirements such as light weight, low volume, low power handling, easy fabrication and low loss. For next generation of wireless communication system, multi band filters have become essential requirement. Due to the applications of multi band filters in wireless networks such as wireless local areas networks (WLAN), global system for mobile communication (GSM) and WiMAX, nowadays they have attracted more attention. Tri-band Bandpass Filter (BPF) is one of the critical frontend components in multiband wireless communication systems. In this paper we discussed some design techniques used in the Tri-band Bandpass Filter and also compared the Tri-band Bandpass Filter on the basis of design techniques.