Miniaturized UWB Bandpass Filters With Notch Using Slow-Wave CPW Multiple-Mode Resonators
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In this letter, a miniaturized, ultra-wideband (UWB) filter with notch using a slow-wave co-planar waveguide (CPW) multiple-mode resonator (MMR) is presented. By employing a slow-wave CPW MMR, the resonator length is reduced by 40% at mid-band frequency compared to the conventional CPW MMR. The proposed UWB filter employs stub-loaded microstrip-CPW transitions that improve the rejection skirt and defected ground structures (DGS) to provide better stopband rejection. A novel bridge structure is proposed to create a notch in the filter passband to reject WLAN interference. A passband from 3.1 to 10.6 GHz (110% bandwidth around 6.85 GHz) with a rejection notch at 5.65 GHz is achieved with insertion loss of 0.9 dB and return loss better than 10 dB. Using DGS, a rejection greater than 22 dB is achieved from 11 to 16 GHz while still having a 25% reduction in filter size compared to the conventional case. Design, simulation and measurement of filter prototypes are presented. 2010 IEEE.
IEEE Microwave and Wireless Components Letters
author list (cited authors)
Sekar, V., & Entesari, K.
complete list of authors
Sekar, Vikram||Entesari, Kamran