Suppression of harmonic radiation of tunable Planar Inverted-F Antenna by ferroelectric varactor loading

Low-cost ferroelectric varactors based on Barium-Strontium-Titanate (BST) thick-film technology have been implemented in a tunable Planar Inverted-F Antenna (PIFA). A prototype is realized and measured. The harmonic radiation is evaluated in detail. It is shown that, considerable RF voltage detunes...

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Bibliographic Details
Main Authors: Yuliang Zheng, Hristov, Atanas, Giere, Andre, Jakoby, Rolf
Format: Conference Proceeding
Language:English
Subjects:
BST
Ferroelectric
Harmonic analysis
Harmonic radiation
PIFA
Power harmonic filters
Power system harmonics
Prototypes
Radio frequency
Tunable antenna
Tuning
Varactors
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Summary:Low-cost ferroelectric varactors based on Barium-Strontium-Titanate (BST) thick-film technology have been implemented in a tunable Planar Inverted-F Antenna (PIFA). A prototype is realized and measured. The harmonic radiation is evaluated in detail. It is shown that, considerable RF voltage detunes the varactor and stimulates harmonic radiation in the varactor-loaded PIFA. It is discussed how such radiation can be suppressed by choosing the varactor's tuning behavior. The passive BST thick-film varactors are proven to have advantages in reducing the harmonic excitation. When compared to a reference design using a silicon diode, the prototype shows suppressions on the second harmonic radiation up to 35.7 dB at −10 dBm input power. Possible suppression by BST thin-film varactors which are featured of low tuning voltages is also discussed.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2008.4632993