Open AccessTunable channelised bandstop passive filter using reconfigurable phase shifter
Author(s) -
Lababidi Raafat,
Al Shami Maryam,
Le Roy Marc,
Le Jeune Denis,
Khoder Khaled,
Pérennec André
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5430
Subject(s) - varicap , phase shift module , band stop filter , band pass filter , passband , topology (electrical circuits) , filter (signal processing) , electronic engineering , signal (programming language) , voltage controlled filter , insertion loss , computer science , low pass filter , physics , engineering , electrical engineering , electrode , quantum mechanics , capacitance , programming language
A novel tunable channelised two‐branches passive bandstop filter using a reconfigurable parallel‐coupled‐line‐based phase shifter (PS) is presented. The filter topology uses the signal destructive principle and aims to protect the receiver against an unwanted interference signal received by the antenna. The global filter topology contains two branches, each of which has a different function. The bandpass tunable branch selects the frequency to be rejected while the reconfigurable PS plays the signal inverter role. The simultaneous tunabilities of both bandpass and PS branches are ensured by using identical varactor diodes and features 550–700 MHz tuning range. In addition to having a constant and relatively high rejection level over all the tuning range and low insertion loss in the passband area, the filter guaranties ultra‐low power consumption. Moreover, synthesis equations are proposed and used to illustrate the operating principle, and finally validated by comparing simulations results to measurements.