Open AccessW‐band waveguide filter based on large TM 120 resonators to ease CNC milling
Author(s) -
Shang Xiaobang,
Lancaster Michael,
Dong YuLiang
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.4131
Subject(s) - insertion loss , passband , resonator , band pass filter , materials science , return loss , filter (signal processing) , waveguide filter , prototype filter , bandwidth (computing) , waveguide , fabrication , center frequency , optoelectronics , optics , filter design , physics , antenna (radio) , telecommunications , electrical engineering , computer science , engineering , medicine , alternative medicine , pathology
A W‐band waveguide bandpass filter, based on coupled TM 120 resonators, fabricated using CNC milling, is presented. TM 120 resonators are superior to conventional TE 101 resonators, in terms of having a larger size and reduced aspect ratio, which facilitates the fabrication process as well as allowing larger tolerances in the milling process. This type of resonator also offers a high unloaded quality factor, and ultimately yields a small insertion loss for the filter. A W‐band filter, with a centre frequency of 100 GHz and a fractional bandwidth of 6%, is designed using four TM 120 resonators and constructed from three brass shims which directly fit to the waveguide flanges. This filter is measured to have a median passband insertion loss of 0.5 dB and a return loss better than 13 dB across the whole passband.