Low insertion loss K-band BPF using parallel-coupled air-suspended microstrip lines on anodised aluminium substrate

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A K-band bandpass filter (BPF) using a parallel-coupled air-suspended microstrip on an anodised aluminium substrate has been demonstrated. The air-suspended structure can be easily fabricated by exploiting the vertical etching property of anodised aluminium oxide. To compare the air-suspended microstrip with conventional microstrips, insertion losses of the coupled lines were calculated using semi-empirical equations. The air-suspended microstrip has the advantage of low insertion loss (IL) over that of a conventional RF substrate when the frequency is higher than 25 GHz, although the physical length of the line is longer. The fabricated filter has a centre frequency of 25.3 GHz, a minimum IL of 1.53 dB, and a fractional band width of 14.2%.
Publisher
INST ENGINEERING TECHNOLOGY-IET
Issue Date
2012-04
Language
English
Article Type
Article
Citation

ELECTRONICS LETTERS, v.48, no.8, pp.437 - 438

ISSN
0013-5194
DOI
10.1049/el.2011.3326
URI
http://hdl.handle.net/10203/101603
Appears in Collection
EE-Journal Papers(저널논문)
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