Open AccessCompact Broadband Absorptive Bandstop Filter Based on Microstrip
Author(s) -
Qi Lu,
Xuqiang Wu,
Chao Wang
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1651/1/012104
Subject(s) - stopband , band stop filter , microstrip , stub (electronics) , broadband , center frequency , resistor , bandwidth (computing) , materials science , passband , acoustics , low pass filter , electronic engineering , optoelectronics , electrical engineering , band pass filter , optics , telecommunications , physics , computer science , resonator , engineering , voltage
A compact broadband absorptive band rejection filter (ABSF) based on microstrip line is proposed. The filter consists of a pair of coupled wires and is loaded with a resistor. The coupling line of the filter has an open stub. The transmission zero point can be adjusted by adjusting the width of the coupling line. The center frequency can be adjusted by changing the length of the intermediate coupling line. Absorption performance can be achieved through loaded resistors. In this way, the signal not input in the filter will be dissipated in the filter and will not be reflected. When F 0 =3.8 GHz, 26% of the 20 dB bandwidth covers 3.15 GHz-4.2 GHz, the rejection depth of the stopband is less than -40 dB, and the in-band absorption is less than -10 dB.