Abstract
The novel microwave quasi-elliptic bandstop filter, which uses the initially uncoupled strip transmission lines, is considered in this work. The proposed filter is based on the reentrant structure, where the metallic body with a floating potential is asymmetric. Generally speaking, the internal and external dielectric fillings must have their unequal relative permittivities. As a result, additional symmetrical reflection zeros are reached at the lower and upper pass bands of the stop band leading to the quasi-elliptic function response that improves the filter selectivity. The general transverse electromagnetic (TEM) circuit model for the proposed filter in terms of a series connection of the multi-ports is presented and then used to predict the initial electrical and geometrical parameters. An experimental printed circuit prototype has been manufactured and evaluated to validate the design concept. The measured filter parameters correlate well with the simulation-derived ones and that increases the degree of freedom in the fabrication of microwave frequency selective components.
Highlights
The microwave bandstop filters (BSFs) play an important role in the support of distortion reductions through the radio frequency (RF) and microwave communities [1]
We propose for the first time a novel approach to design a reentrant structure with additional at the lower and and upper pass bands of the stop band, additional symmetrical symmetricalreflection reflectionzeros zeros at the lower upper pass bands of the stopleading band, to the quasi-elliptic frequency response that improves the manufacturing and selectivity of the leading to the quasi-elliptic frequency response that improves the manufacturing and selectivity filter
A novel bandstop filter was developed on a untraditional reentrant configuration base
Summary
The microwave bandstop filters (BSFs) play an important role in the support of distortion reductions through the radio frequency (RF) and microwave communities [1]. Many efforts have been pooled to realize various kinds of wideband BSFs [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] Each such filter is a successful discovery in terms of insertion and return losses through the prescribed frequency band. Reference [3] contains Chapter 6 related to the various kinds of BSFs, including filters with narrow stop bands These BSFs have stop-band bandwidths up to a few per cent, and equiripple or maximally flat characteristics in the pass-band. The second resembles the cul-de-sac configuration and needs no Electronics 2019, 8, 81; doi:10.3390/electronics8010081 www.mdpi.com/journal/electronics
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