Commutation quality factor of two-state switchable devices

Vendik, I.; Vendik, O. G.; Kollberg, E.

doi:10.1109/22.841874

Cited by 72 publications

(49 citation statements)

References 14 publications

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“…In addition to large tunability, it is usually desirable to have low losses. A figure of merit for a tunable material which measures both quantities at the same time is defined as [23] …”

Section: Tunability and The Figure Of Meritmentioning

confidence: 99%

Tunability of Granular Ferroelectric Dielectric Composites

Jylhä¹,

Sihvola²

2008

PIER

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Abstract-Electrical tunability of a composite consisting of small ferroelectric spheres randomly dispersed into a dielectric background is studied. A new method to calculate the effective permittivity of such a nonlinear composite is introduced. The method is based on the Bruggeman effective medium theory and a specific model for the nonlinear permittivity of the ferrite. The resulting tunability (defined as a measure of the change in the permittivity due to the bias field) is a continuous function of the volume fraction of the ferroelectric material phase in the composite. As an example, SrTiO 3 is studied with two different nontunable background materials.

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“…In addition to large tunability, it is usually desirable to have low losses. A figure of merit for a tunable material which measures both quantities at the same time is defined as [23] …”

Section: Tunability and The Figure Of Meritmentioning

confidence: 99%

Tunability of Granular Ferroelectric Dielectric Composites

Jylhä¹,

Sihvola²

2008

PIER

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“…The commutation quality factor (CQF) introduced by Vendik [10] can be used to characterize the ferroelectric materials and varactors on their base in point of MW application. This parameter takes into account the dc-field induced changes both in capacitance and in loss tangent.…”

Section: Experiments and Discussionmentioning

confidence: 99%

Separation of the Metallic and Dielectric Losses of Tunable Ferroelectric Capacitors Under Control Dc Voltage

Kotel'nikov¹,

Osadchy²,

Platonov³

et al. 2018

PIER Letters

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Abstract-An approach to separate the metallic and dielectric losses in ferroelectric capacitors in all range of tuning under control dc voltages (U dc ) is considered. The procedure is based on measurements of the dc voltage dependencies of microwave losses (tan δ t (U dc )) and capacitance (C(U dc )) for a set of capacitors with similar layout but with different nominals. Linear extrapolation of tan δ t (C) dependencies at different control dc voltages to C = 0 allows to evaluate the dielectric losses tan δ d as a function of the control dc voltage. The procedure of separation was performed for a set of sandwich metal/(Ba 0.5 Sr 0.5 )TiO 3 /metal capacitors. Capacitors parameters were measured at a frequency of 2 GHz in a range of electric field strength in ferroelectric of E = (0 − 30) V/µm. The intrinsic commutation quality factor of BSTO film itself was estimated by the method proposed.

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“…Dissipative loss of the RFSS strongly depends on the commutation quality factor of the switch [44], while the frequency shift is due to the loading of the switch's off-state capacitance. Minimization of dissipative loss can be accomplished by optimal transformation of switch impedances [45].…”

Section: Effect Of the Switch's Impedances On The Rfss Performancementioning

confidence: 99%

An Active Ring Slot With Rf Mems Switchable Radial Stubs for Reconfigurable Frequency Selective Surface Applications

Martinez-Lopez¹,

Rodriguez-Cuevas²,

Martynyuk³

et al. 2012

PIER

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Abstract-An active ring slot resonator loaded by switchable radial stubs is investigated. It is shown that this element can be used as the unit cell of a switchable reconfigurable frequency selective surface (RFSS). Equivalent circuit and full-wave mathematical models are obtained to evaluate the reflection characteristics of the RFSS based on this element. The possibility to obtain different resonant transmission frequencies is discussed. The mathematical model developed is used to design an X band RFSS capable of obtaining resonant frequencies at 9.65, 10.28, 10.83 and 12.05 GHz. Commercially available RF MEMS switches are used to evaluate the effect of the off-state capacitances over the response of the periodic structure. To validate the numerical simulation results, different active and passive diaphragms were designed, fabricated, and tested using the waveguide simulator. A good agreement between numerical and measured results was found.

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Commutation quality factor of two-state switchable devices

Cited by 72 publications

References 14 publications

Tunability of Granular Ferroelectric Dielectric Composites

Tunability of Granular Ferroelectric Dielectric Composites

Separation of the Metallic and Dielectric Losses of Tunable Ferroelectric Capacitors Under Control Dc Voltage

An Active Ring Slot With Rf Mems Switchable Radial Stubs for Reconfigurable Frequency Selective Surface Applications

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