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Suppression of Harmonic Radiation of Tunable PIFA by Thick-film BST Varactor Loading

Zheng, Yuliang and Hristov, Atanas and Giere, Andre and Jakoby, Rolf (2008):
Suppression of Harmonic Radiation of Tunable PIFA by Thick-film BST Varactor Loading.
In: IEEE MTT-S International Microwave Symposium Digest, [Conference or Workshop Item]

Abstract

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.

Item Type: Conference or Workshop Item
Erschienen: 2008
Creators: Zheng, Yuliang and Hristov, Atanas and Giere, Andre and Jakoby, Rolf
Title: Suppression of Harmonic Radiation of Tunable PIFA by Thick-film BST Varactor Loading
Language: English
Abstract:

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.

Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Microwave Engineering
18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics
Event Title: IEEE MTT-S International Microwave Symposium Digest
Date Deposited: 27 Jan 2012 15:20
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