Tunable microstrip filter element using magnetically-repositioned ferrofluid load

A microstrip filter element that is tunable through magnetic repositioning of a ferrofluid load is presented. A channel beneath the microstrip stub is partially filled with ferrofluid which moves in response to a DC bias field placed beneath the ground plane, resulting in a changing impedance and pr...

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Bibliographic Details
Published in:Electronics letters 2017-02, Vol.53 (4), p.256-258
Main Authors: Horton, A.S, Chilton, S.L, Sigmarsson, H.H, Ruyle, J.E
Format: Article
Language:English
Subjects:
Channels
DC bias field
device operating mode
electrical isolation
Electronics
ferrofluid load
Ferrofluids
filter element
Ground plane
magnetic fluids
magnetically‐repositioned ferrofluid load
microfluidic reconfiguration
Microfluidics
microstrip filters
microstrip stub
Microwave technology
power source
propagation constant
Pumping
Reconfiguration
stub section
tunable microstrip filter element
Tuning
tuning method
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Summary:A microstrip filter element that is tunable through magnetic repositioning of a ferrofluid load is presented. A channel beneath the microstrip stub is partially filled with ferrofluid which moves in response to a DC bias field placed beneath the ground plane, resulting in a changing impedance and propagation constant for the stub section and tuning of the filter element. Benefits of this tuning method include electrical isolation between the tuning system and the filter element, retention of the device's operating mode without the need for a power source, and microfluidic reconfiguration without a pumping system.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2016.4567