Design of CSRR Based Tri Band Pass Filter for RF Communication

Now a days multiband microwave communication system is used in wireless applications. In most of the RF receiver using conventional type micro strip band pass filter, the noise interference problem due to harmonics and spurious frequencies are occurred. Also to reduce the size and noise interference problem, multiband reconfigurable band pass filter is suitable for high frequency wireless communication [4]. The single substrate can be used in a multi band communication system. The switching between multiple band frequency operations is possible due to frequency reconfiguration technique. Due to single substrate for multiband frequency, size of the filter is also reduces. This research work presents a use of complementary split ring resonator (CSRR) micro strip structure for design of tri band pass filter for frequency reconfigurations. The pass band characteristics are improved by using square type CSRR structure also it reduces the size of filter. The aim of this paper is to present the design of triple band pass filter operated on frequencies at 2.45 GHz for ISM, 3.3GHz for Wi-MAX and 5.5GHz for WLAN applications used as a reconfigurable band pass filter. The square type complementary split ring resonator (CSRR) structure is used. The design parameters like strip width, length and resonator gap are on the basis of half wavelength. The simulation software, HFSS is used for design and analysis of this filter.