LOW VOLTAGE TUNABLE BAND PASS FILTERS USING BARIUM STRONTIUM TITANATE PARALLEL PLATE CAPACITORS

T. S. Kalkur Microelectronics Research Laboratories, University of Colorado at Colorado Springs, Colorado Springs, CO, 80933-7150

N. M. SBROCKEY Structured Materials Industries, Piscataway, NJ, 08854-3723

G. S. TOMPA Structured Materials Industries, Piscataway, NJ, 08854-3723

PAMIR ALPAY University of Connecticut, Storrs, CT, 06269

J. E. SPANIER Drexel University, PA, 19104

E. M. GALOW Drexel University, PA, 19104

M. W. COLE US Army Research Lab, APG, MD, 21005

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Pages 1-7 | Received 27 Sep 2009, Accepted 13 Dec 2010, Published online: 05 Nov 2010

Cite this article
https://doi.org/10.1080/10584587.2009.484656

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ABSTRACT

In this paper, we report the results of third order combline inter-digited band pass filters implemented with parallel plate barium strontium titanate (BST) capacitors on sapphire substrates with platinum electrodes. The frequency characteristics of the filters were simulated using Sonnet software package. The resonators were implemented on FR-4 substrates using a LPKF rapid prototyping machine. The resonators were loaded with BST capacitors prepared on sapphire substrates by metalorganic decomposition (MOD). The measured center frequency of the filters was 1.35 GHz with a 3 db bandwidth of 0.15 GHz for zero bias voltage to the ferroelectric capacitors. The center frequency can be tuned from 1.35 GHz to1.45 GHz for an applied tuning voltage of 3 Volts.

ACKNOWLEDGMENT

This project was supported by STTR Phase II from Army Research Labs, W911NF-08-C-0124.

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