Low-Sintering-Temperature Ferroelectric-Thick Films: RF Properties and an Application in a Frequency-Tunable Folded Slot Antenna

This investigation is one of the first steps toward the realization of low-cost, mass-producible, tunable antenna applications utilizing an integrated ferroelectric-thick film made of bariumstrontiumtitanate material. The dielectric properties of the electric-field-adjustable fired BST thick film ar...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2008, Vol.7, p.461-464
Main Authors: Palukuru, V.K., Komulainen, M., Tick, T., Perantie, J., Jantunen, H.
Format: Article
Language:English
Subjects:
Binary search trees
Dielectric materials
Electrodes
Ferroelectric films
Ferroelectric material
Ferroelectric materials
folded slot antennas
Radio frequency
reconfigurable antennas
Silver
Slot antennas
Thick films
Tuning
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Summary:This investigation is one of the first steps toward the realization of low-cost, mass-producible, tunable antenna applications utilizing an integrated ferroelectric-thick film made of bariumstrontiumtitanate material. The dielectric properties of the electric-field-adjustable fired BST thick film are presented in the frequency range of 16 GHz. The key advantages of the material are high tunability (25% with 2.5 V/mum), compatibility with silver electrodes, and the ability to produce film thicknesses down to 25 mum. The utilization of the material is demonstrated by tuning the operating frequency of a folded slot antenna with an integrated variable capacitor. In addition, the impact of tuning on the antenna's total efficiency and radiation pattern is experimentally studied through a comparison with the performance of a reference antenna not incorporating the varactor.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2008.2001120