Tunable RF filters using thin film barium strontium titanate based capacitors

Tombak, A.; Ayguavives, F.; Maria, Jon Paul; Stauf, Gregory T.; Kingon, Angus I.; Mortazawi, Amir

doi:10.1109/mwsym.2001.967176

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…The measurements were taken with an Agilent E4991A RF-impedance analyzer after appropriate calibration. The capacitance value C is extracted from the measured input admittance Y according to (1).…”

Section: Ferroelectric Thin-film Varactorsmentioning

confidence: 99%

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Tunable Lumped Element Filters With BST Thin-Film Varactors

Lourandakis

Schmidt²,

Seitz³

et al. 2008

2008 38th European Microwave Conference

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Tunable lumped element filter topologies are discussed based on ferroelectric thin-film varactors. The design methodology for the proposed filter topologies relies on already known techniques and is enhanced with the tuning functionality by introducing the Barium-Strontium-Titanate (BST) varactors. Prototype circuits of a lowpass and a bandstop filter were fabricated and the measurement results showed good agreement to the corresponding calculated data. The lowpass prototype achieves a continuous tuning range from 1.5 GHz to 1.9 GHz. The highest measured passband insertion loss is about 4 dB and the input matching is better than -15 dB for all bias states. The implemented bandstop filter allows a continuous tuning of the notch frequency from 1.5 GHz to 2.1 GHz with a minimum attenuation of 17 dB.

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Section: Ferroelectric Thin-film Varactorsmentioning

confidence: 99%

“…Thus a whole new family of microwave systems with tunable or frequency agile characteristics have been introduced, e.g. filters [1], [2], phase shifters [3], and matching networks [4]. Especially for mobile communications and their hand held user devices, the trend is clearly moving toward an increased number of communication bands.…”

Section: Introductionmentioning

confidence: 99%

Tunable Lumped Element Filters With BST Thin-Film Varactors

Lourandakis

Schmidt²,

Seitz³

et al. 2008

2008 38th European Microwave Conference

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show abstract

“…[1][2][3][4] BST thin films for tunable devices are commonly fabricated by physical vapour deposition (sputtering and pulsed laser deposition), chemical vapour deposition/MOCVD, sol-gel or screen printing technology. Currently, BST thick films fabricated by tape casting and low temperature co-fired ceramic (LTCC) technology are receiving a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

The effect of Mn on the microstructure and properties of BaSrTiO3 with B2O3–Li2CO3

Price

Iddles

et al. 2005

Journal of the European Ceramic Society

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“…C'est pourquoi, l'introduction de matériau ferroélectrique permet d'envisager d'effectuer l'ajustement par une modification de la tension continue appliquée à certains éléments du système. Le titanate de baryum et strontium BaSri-xTiOg (EST) est l'un des matériaux ferroélectriques les plus utilisés dans la conception de dispositifs hyperfréquences accordables en fréquence [2]- [3].…”

Section: Introduction De Nouveaux Materiaux-réalisation D'hétérostrucunclassified