Study on slot irises for tunable filters using TE011 mode

Tunable filters using the TE011 mode have slot irises for coupling between cavities. Unless the slot iris is appropriately designed, the coupling value of the iris varies as an operating frequency changes and the filter performance deteriorates as a result. In this reported work, it was found that t...

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Bibliographic Details
Published inElectronics letters Vol. 51; no. 3; pp. 266 - 268
Main Authors Kwak, Changsoo, Uhm, Manseok, Yom, In-Bok
Format Journal Article
LanguageEnglish
Published The Institution of Engineering and Technology 05.02.2015
Subjects
cavity resonator filters
cylindrical cavity
electromagnetic coupling
frequency‐dependent coupling characteristic
full wave EM simulation
Ka‐band two pole filter
microwave filters
Microwave technology
operating frequency tuning
slot iris design
TE011 mode
tunable filters
cylindrical cavity
tunable filters
cavity resonator filters
slot iris design
microwave filters
electromagnetic coupling
frequency-dependent coupling characteristic
Ka-band two pole filter
TE011 mode
operating frequency tuning
full wave EM simulation
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Summary:Tunable filters using the TE011 mode have slot irises for coupling between cavities. Unless the slot iris is appropriately designed, the coupling value of the iris varies as an operating frequency changes and the filter performance deteriorates as a result. In this reported work, it was found that the frequency-dependent coupling characteristic of the slot iris can be minimised by locating the iris appropriately. Why the coupling of a slot iris changes when the operating frequency is tuned is explained and how to find the optimum location of the slot iris for minimum variation of the coupling value is presented. The proposed theory is verified by full-wave EM simulations and experiments with a Ka-band two-pole filter.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2014.3552