Voltage and frequency dependent dielectric properties of BST-0.5 thin films on alumina substrates

Delprat, S.; Ouaddari, M.; Vidal, François; Chaker, Mohamed; Wu, Ke

doi:10.1109/lmwc.2003.814091

Cited by 33 publications

(6 citation statements)

References 12 publications

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“…Indeed, under application of similar biasing fields, our experimental data were close to those currently produced by the best planar capacitors, i.e. the interdigital ones based on BST ferroelectrics [14]. The recent acquisition of bias tees to increase voltages allowed us to reach levels like those reported in the literature.…”

Section: Microwave Measurementssupporting

confidence: 85%

Ferroelectric-based agile devices—Application to tunable filters

Laur¹,

Rousseau²,

Tanné³

et al. 2007

Int J RF and Microwave Comp Aid Eng

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The development of multistandard devices requires the realization of tunable functions such as filters and phase-shifters. This led us to fabricate stubs and interdigital capacitors with ferroelectric materials so as to use them as basic circuits in loaded structures for further investigations about their behavior at microwave frequencies. This study was aimed at assessing topologies to find the one the most able to take benefit of the agility provided by the ferroelectric material.

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Section: Microwave Measurementssupporting

confidence: 85%

Ferroelectric-based agile devices—Application to tunable filters

Laur¹,

Rousseau²,

Tanné³

et al. 2007

Int J RF and Microwave Comp Aid Eng

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“…In this work, we investigate the dielectric properties over a very wide range of microwave frequencies ͑45 MHz-50 GHz͒, rather than at the lower, narrower frequency ranges ͑Ͻ10 GHz͒ more commonly studied. [3][4][5] The material investigated is Ba 0.5 Sr 0.5 TiO 3 , which has a Curie temperature ͑T c ͒ around room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microwave properties of Ba0.5Sr0.5TiO3 thin film coplanar phase shifters

Suherman

Jackson

Tse

et al. 2006

Journal of Applied Physics

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Coplanar waveguide transmission lines have been used to show that the temperature dependent properties of Ba 0.5 Sr 0.5 TiO 3 thin films used for microwave phase shifters in the frequency range 45 MHz-50 GHz are correlated strongly with the microstructure of the films. The highest tunability and figure of merit of the phase shifters were obtained for films with the narrowest ferroelectric-paraelectric phase transition range, lowest mosaic spread, and widest columnar microstructure. The study also showed that the operating temperature plays an important role in achieving the optimum phase shift for microwave applications.

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“…In lossless case, the dielectric loss and metal loss have not been considered and G I presents the loss due to leakage. In lossy case, G I presents the losses In our experiments, the Barium-Strontium-Titanate (BST) thin films (e r 5 500, tan d 5 0.05, thickness is 700 nm) are deposited on the alumina substrate [19,20] (e r 5 9.8, tan d 5 0.02). The bias voltage is set in range 0-40 V applied between the two groups of fingers in our experiment.…”

Section: Simulation and Experimentsmentioning

confidence: 99%

Parameter extraction of interdigital slow-wave coplanar waveguide circuits using finite difference frequency domain algorithm

et al. 2008

Int J RF and Microwave Comp Aid Eng

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The slow wave effect can be obtained by a capacitively loaded structure with a symmetrical interdigital line connected on both sides of the coplanar waveguide (CPW) central line. The ferroelectric thin film with high dielectric constant can reduce the size of circuit and make it possible to realize tunable devices such as filter by applying voltage on it. Actually, this kind of slow wave structure is a periodic guided-wave structure and can be analyzed by using classic finite difference frequency domain (FDFD) method for periodic guided-wave structures. However, the very compact slow-wave structures will usually result in simulation errors when the classic FDFD method is adopted, which will lead to a nonsymmetrical generalized eigenvalue problem. In this article, the shift-and-invert (SI) Arnoldi method is used to directly resolve this nonsymmetrical generalized eigenvalue problem. As a result, the accuracy of FDFD algorithm is improved. Especially for the large scale eigenvalue problem, SI method can also have a very fast speed of calculation. By means of its complex propagation constant obtained from simulation, one can extract circuit parameters of the interdigital capacitor. Consequently, one can analyze and design relevant resonators and filters in a quick and accurate manner, which are constructed with such interdigital slow wave structures.

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Voltage and frequency dependent dielectric properties of BST-0.5 thin films on alumina substrates

Cited by 33 publications

References 12 publications

Ferroelectric-based agile devices—Application to tunable filters

Ferroelectric-based agile devices—Application to tunable filters

Microwave properties of Ba0.5Sr0.5TiO3 thin film coplanar phase shifters

Parameter extraction of interdigital slow-wave coplanar waveguide circuits using finite difference frequency domain algorithm

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