Novel Tunable Bandpass Filter Realized Using Barium-Strontium-Titanate Thin Films

HT Su; PM Suherman; Timothy Jackson; Frederick Huang; Michael Lancaster

doi:10.1109/TMTT.2008.2005871

Novel Tunable Bandpass Filter Realized Using Barium-Strontium-Titanate Thin Films

HT Su, PM Suherman, Timothy Jackson, Frederick Huang, Michael Lancaster

Electronic, Electrical and Systems Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A novel three-pole electrically tunable narrow bandpass filter has been fabricated from bi-layer YBCO/Ba0.05Sr0.95 TiO3 thin films. At 77 K, and without bias, the filter has a center frequency of 3.50 GHz and 5.8% bandwidth. Independent application of dc bias to each of the resonators of 120, 182, and 100 V shifted the center frequency to 3.68 GHz. The insertion loss was less than 1.4 dB and return loss was better than 20 dB. A similar filter was made using bi-layer Ag/Ba0.5Sr0.5 TiO3 thin films and measured at room temperature. The insertion loss of the filter was, as expected, much higher, although it showed improved tunability as compared with the YBCO version.

Original language	English
Pages (from-to)	2468-2473
Number of pages	6
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	56
Issue number	11
DOIs	https://doi.org/10.1109/TMTT.2008.2005871
Publication status	Published - 1 Nov 2008

Keywords

tunable bandpass filter
Ferroelectric films
high-temperature superconductor

Access to Document

10.1109/TMTT.2008.2005871

Advanced Microwave Devices for Frequency-Agile Applications
Lancaster, M. (Principal Investigator) & Jackson, T. (Co-Investigator)
Engineering & Physical Science Research Council
28/11/05 → 27/05/09
Project: Research Councils

Cite this

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title = "Novel Tunable Bandpass Filter Realized Using Barium-Strontium-Titanate Thin Films",

abstract = "A novel three-pole electrically tunable narrow bandpass filter has been fabricated from bi-layer YBCO/Ba0.05Sr0.95 TiO3 thin films. At 77 K, and without bias, the filter has a center frequency of 3.50 GHz and 5.8% bandwidth. Independent application of dc bias to each of the resonators of 120, 182, and 100 V shifted the center frequency to 3.68 GHz. The insertion loss was less than 1.4 dB and return loss was better than 20 dB. A similar filter was made using bi-layer Ag/Ba0.5Sr0.5 TiO3 thin films and measured at room temperature. The insertion loss of the filter was, as expected, much higher, although it showed improved tunability as compared with the YBCO version.",

keywords = "tunable bandpass filter, Ferroelectric films, high-temperature superconductor",

author = "HT Su and PM Suherman and Timothy Jackson and Frederick Huang and Michael Lancaster",

year = "2008",

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doi = "10.1109/TMTT.2008.2005871",

language = "English",

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AU - Su, HT

AU - Suherman, PM

AU - Jackson, Timothy

AU - Huang, Frederick

AU - Lancaster, Michael

PY - 2008/11/1

Y1 - 2008/11/1

N2 - A novel three-pole electrically tunable narrow bandpass filter has been fabricated from bi-layer YBCO/Ba0.05Sr0.95 TiO3 thin films. At 77 K, and without bias, the filter has a center frequency of 3.50 GHz and 5.8% bandwidth. Independent application of dc bias to each of the resonators of 120, 182, and 100 V shifted the center frequency to 3.68 GHz. The insertion loss was less than 1.4 dB and return loss was better than 20 dB. A similar filter was made using bi-layer Ag/Ba0.5Sr0.5 TiO3 thin films and measured at room temperature. The insertion loss of the filter was, as expected, much higher, although it showed improved tunability as compared with the YBCO version.

AB - A novel three-pole electrically tunable narrow bandpass filter has been fabricated from bi-layer YBCO/Ba0.05Sr0.95 TiO3 thin films. At 77 K, and without bias, the filter has a center frequency of 3.50 GHz and 5.8% bandwidth. Independent application of dc bias to each of the resonators of 120, 182, and 100 V shifted the center frequency to 3.68 GHz. The insertion loss was less than 1.4 dB and return loss was better than 20 dB. A similar filter was made using bi-layer Ag/Ba0.5Sr0.5 TiO3 thin films and measured at room temperature. The insertion loss of the filter was, as expected, much higher, although it showed improved tunability as compared with the YBCO version.

KW - tunable bandpass filter

KW - Ferroelectric films

KW - high-temperature superconductor

U2 - 10.1109/TMTT.2008.2005871

DO - 10.1109/TMTT.2008.2005871

M3 - Article

SN - 1557-9670

VL - 56

SP - 2468

EP - 2473

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

IS - 11

ER -

Novel Tunable Bandpass Filter Realized Using Barium-Strontium-Titanate Thin Films

Abstract

Keywords

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Advanced Microwave Devices for Frequency-Agile Applications

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