Design and Analysis of a Quad Band BPF Using Ring Resonator

A flexible quad-band BPF was designed by utilizing a ring resonator and an I shaped resonator is etched from a circular resonator to obtain better return loss, transmission co-efficient and group delay. This I shaped resonator etched from the circular ring can also support the multiple band applications. By utilizing this circular ring resonator, a quad band BPF was designed and simulated by utilizing An-soft HFSS v13. The designed filter results shows that the quad band BPF resonates at 11.2GHz, 14.2GHz, 16.5GHz and 19.6GHz with a transmission co-efficient of 0.2dB at all the resonating frequencies and return loss of -27dB, - 47.3dB, -15.7dB and -36.1dB with a fractional bandwidth of 4.1 %, 4.15%, 10.9% and 2.3% respectively.