A 5/6 GHz MMR Structure Based UWB Bandpass Notch Filter Embedded with a Spur line for Wireless Applications

A ultra-wideband (UWB) band pass filter is proposed which can produce the band-rejection in the band of 5-6 GHz, that is the band of operation of WLAN. A multi-mode resonator (MMR) structure is employed for the realization of the UWB band pass filter whose pass band extends from 3.12 GHz to 15.06 GHz which covers the UWB spectrum ranging from 3.1 GHz to 10.6 GHz. A spur line design is introduced in the MMR structure to obtain a sharp narrow notched band of rejection at 5-6 GHz after the realization of the UWB band-pass filter using the MMR structure. The return loss in whole pass band of UWB is higher than 10 dB and variation of the group delay is almost less than 0.25 ns.