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A design of waveguide elliptic filter based on resonant diaphragms with a complex aperture
Author(s) -
Zemlyakov Viacheslav,
Krutiev Sergey,
Tyaglov Mikhail,
Shevchenko Valery
Publication year - 2019
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2566
Subject(s) - passband , aperture (computer memory) , diaphragm (acoustics) , resonator , optics , waveguide filter , elliptic filter , filter (signal processing) , waveguide , band pass filter , physics , prototype filter , acoustics , low pass filter , materials science , engineering , electrical engineering , vibration
Summary A novel approach to the synthesis of waveguide band‐pass elliptic filters on the transverse metal resonant diaphragms with the complex aperture is proposed. The aperture of the diaphragm is considered to be a rectangular window with two L‐shaped metal ridges. For the complex conductivity of the diaphragm, we solve the corresponding electrodynamic problem. We also construct and investigate an equivalent circuit of the resonant diaphragm containing a series‐parallel LC circuit. The geometry of the diaphragm aperture is found to be corresponding to the parameters of the equivalent circuit. We construct a third‐order elliptic filter and provide a computer simulation of the diaphragms satisfying the amplitude‐frequency characteristics of its resonators. We show that some resonators can be located on one complex resonant diaphragm, which then reduces the length of the filter. The band‐pass filter for a rectangular waveguide WR137 is developed and manufactured. The central frequency of the filter is 6.6 GHz, the passband width 7.5 % with return loss of −20 dB, and the total length is 34 mm.