Fabrication and characterization of barium strontium titanate and non-ferroelectric oxide composites for use in phased array antennas and other electronic devices

Sengupta, L. C.; Ngo, E.; O'Day, M.E.; Stowell, S.; Lancto, R.

doi:10.1109/isaf.1994.522447

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Mg-doped BST bulk ceramics were reported to possess low loss tangents, low dielectric constant and suitable tunability. [6][7][8] The effects of 0.5 mol.% of various rare earth oxide dopants on 40 wt% Ba 0.6 Sr 0.4 TiO 3 , 60 wt% MgO (BSTM) had been studied. 9 It shows that the composite is tunable with very * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Wang

Liu

et al. 2006

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Wang

Liu

et al. 2006

Journal of the European Ceramic Society

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“…The loss tangent serves to dissipate or absorb the incident microwave energy; thus, a low loss tangent serves to decrease the insertion loss. 3) Numerous studies on the dielectric properties of (Ba 1Àx Sr x )TiO 3 -based ceramics using the conventional mixed oxide method have been carried out. The real part of the relative dielectric constant of Ba x Sr 1Àx TiO 3 ceramics varies from 200 to 900, and the loss factor of Ba x Sr 1Àx TiO 3 ceramics varies from 10 À3 to 10 À2 at around 2 GHz.…”

Section: Introductionmentioning

confidence: 99%

Curve Fitting of Dielectric Constant and Loss Factor of ZrO₂-Doped Barium Strontium Titanate for Application in Phased Array Antennas

Chen¹,

Chen

Wang³

et al. 2007

jjap

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DC electric field effects on the real part of the relative dielectric constant and the loss factor of barium strontium titanate for application in phased array antennas have been studied. The real part of the relative dielectric constant of the specimens decreases with increasing applied DC field. The loss factor under bias DC electric field is slighter than the real part of the relative dielectric constant under bias DC electric field does. The tunability is about 50% for barium strontium titanate doped with 0.5 wt % ZrO2 content. Variation of field coefficient A and tunability with ZrO2 contents have the same trend as that of the grain size. The real part of the relative dielectric constant of ZrO2-doped barium strontium titanate decreases rapidly before 1.0 kV/cm and slowly after 1 kV/cm compared within the data obtained by the curve fitting with Johnson's model. Compared with the fittings with the Johnson's model, the fittings with the Heywang model exhibit a small deviation between the testing and fitting data at a high applied voltage level. There is a conduction loss mechanism other than the intrinsic dielectric loss for the dielectric loss under bias electric field.

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“…The phase shifting ability is directly related to the dielectric tunability; therefore, a higher dielectric tunability is desirable. 3) Numerous studies on the dielectric properties of (Ba 1Àx Sr x )TiO 3 -based ceramics have been carried out. The real part of the relative dielectric constant of Ba x Sr 1Àx TiO 3 ceramics varies from 200 to 900, and their loss factor ceramics varies from 10 À3 to 10 À2 of around 2 GHz.…”

Section: Introductionmentioning

confidence: 99%

Curve Fitting of DC Field Dependence of Dielectric Constant of Barium Strontium Titanate Powder Prepared by Sol–Gel Process

Chen

Huang

2005

Jpn. J. Appl. Phys.

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Effects of a DC-biasing field on the real part of the relative dielectric constant of barium strontium titanate powder prepared by the sol–gel process for application in phased array antennas have been studied. The real part of the relative dielectric constant of specimens decreases with increasing applied DC biasing field. An overall tunability of 15.7% at 1.5 kV/cm is achieved. The real part of the relative dielectric constant of specimens decreases rapidly before 1.0 kV/cm and slowly after 1.0 kV/cm when compared with the fitting data obtained by curve fitting with Johnson's bias equation. With the introduction of a bias exponent coefficient in the denominator of Johnson's bias equation, a modified bias equation is proposed. The data obtained by fitting with this proposed modified bias equation provide a more accurate description of the DC biasing field dependence behavior than those obtained by fitting with Johnson's bias equation.

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Fabrication and characterization of barium strontium titanate and non-ferroelectric oxide composites for use in phased array antennas and other electronic devices

Cited by 10 publications

References 2 publications

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Curve Fitting of Dielectric Constant and Loss Factor of ZrO₂-Doped Barium Strontium Titanate for Application in Phased Array Antennas

Curve Fitting of DC Field Dependence of Dielectric Constant of Barium Strontium Titanate Powder Prepared by Sol–Gel Process

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Fabrication and characterization of barium strontium titanate and non-ferroelectric oxide composites for use in phased array antennas and other electronic devices

Cited by 10 publications

References 2 publications

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications

Curve Fitting of Dielectric Constant and Loss Factor of ZrO2-Doped Barium Strontium Titanate for Application in Phased Array Antennas

Curve Fitting of DC Field Dependence of Dielectric Constant of Barium Strontium Titanate Powder Prepared by Sol–Gel Process

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Curve Fitting of Dielectric Constant and Loss Factor of ZrO₂-Doped Barium Strontium Titanate for Application in Phased Array Antennas