Highly selective cavity based band pass filter using asymmetric double quadruplets

Abstract

A compact design procedure and realization techniques of sharp rejection band pass filter with pre calculated feed position is reported in this paper. Two spatially symmetric quadruplets are used asymmetrically with space mapping technique to adjust transmission zeros for getting desired selectivity. External coupling bandwidths are analysed, calculated and plotted for different feed line widths. A set of design equation are proposed to calculate external coupling bandwidths from the physical dimensions of the feed strip. Inter resonator spacing is utilized in special way to enhance overall bandwidth of the filter.Keywords -Asymmetric quadruplet, transmission zero (TZ), sharp rejection cavity filter External coupling bandwidth and tapped combline filter.

Design Strategies to Overcome EMI/EMC Issues of Airborne Receivers

“…Hence, EMI/EMC (Electro-Magnetic Interference/ Electro Magnetic Compatibility) tests become a challenging task for such airborne application systems [3][4]. Extensive works have been published over the mitigation of EMI/EMC issues starting from circuit level design to system level implementations [5][6][7][8][9][10][11][12][13][14][15][16]. A topological network based model is proposed to carry out system level EMC analysis in [4].…”

“…Model analysis/visualization and mitigation of parasitic coupling paths between various modules like RFdigital, C-L-C filter circuits, flyover QSFP Connectors, switching power converter, high density connectors interface etc. have been discussed in [6][7][8][9][10][11]. This proposed analysis and modelling are limited to either a single board or within a single metallic enclosure.…”