Open AccessSU‐8 micromachined WR‐3 band waveguide bandpass filter with low insertion loss
Author(s) -
Chen Q.,
Shang X.,
Tian Y.,
Xu J.,
Lancaster M.J.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.0277
Subject(s) - passband , insertion loss , chebyshev filter , band pass filter , return loss , materials science , transition band , butterworth filter , resonator , elliptic filter , surface micromachining , bandwidth (computing) , waveguide filter , prototype filter , optics , optoelectronics , low pass filter , physics , telecommunications , electrical engineering , engineering , fabrication , antenna (radio) , medicine , alternative medicine , pathology
Presented is a WR‐3 band (220–325 GHz) waveguide bandpass filter, which is constructed from three offset waveguide resonators operating at TE 101 mode. This directly coupled resonator filter with Chebyshev response is designed to have a centre frequency of 300 GHz, a fractional bandwidth of 3.3% and a passband return loss of 20 dB. This filter is fabricated using thick SU‐8 photoresist micromachining technique and has been tested. The measured average passband insertion loss is as low as around 0.4 dB. The measured return loss is better than 15 dB across the whole passband.