Bandwidth enhancement in band pass filter (BPF) using microstrip couple lines for WLAN (2.4GHZ) applications

BPF has some important role in wireless telecommunication system. The signal to be transmitted and which they are received are filtered at some center frequency having some specific bandwidth. This paper comprises a brief idea related to designing of a band pass filter (BPF) using microstrip parallel coupled line structure. The center frequency is chosen such that it is mainly used in WLAN network or high speed wireless broadband is configured to send data voice and video IP because system requires more bandwidth. The layout is designed such that centre frequency is 2.45GHz with a bandwidth of 250MHz and resonator length of each line is tuned such that impedance is adjusted to 50Ω. Three sections are mainly included in design: two coupled lines separated by a non-uniform line resonator. The full wave EM simulation gives the better result and shows a very good performance with insertion loss of below 4.3dB and return loss of more than -19.29dB in its pass band and during stop band return loss is less than -41.0dB. The simulation is carried out on a HFSS software.