Direct-write inkjet printing for fabrication of barium strontium titanate-based tunable circuits

2007 ◽  
Vol 515 (7-8) ◽  
pp. 3820-3824 ◽  
Author(s):  
T. Kaydanova ◽  
A. Miedaner ◽  
J.D. Perkins ◽  
C. Curtis ◽  
J.L. Alleman ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Inkjet Printing ◽  
Direct Write ◽  
Tunable Circuits ◽  
Barium Strontium

scholarly journals Preparation of Integrated Passive Microwave Devices Through Inkjet Printing

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000232-000239 ◽  
Author(s):  
A. Friederich ◽  
C. Kohler ◽  
M. Sazegar ◽  
M. Nikfalazar ◽  
R. Jakoby ◽  
...  
Keyword(s):  
Grain Growth ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Inkjet Printing ◽  
Sintering Temperature ◽  
Thick Films ◽  
Passive Microwave ◽  
Microwave Devices ◽  
Barium Strontium ◽  
Passive Microwave Devices

Barium strontium titanate (BST) is a promising material for passive tunable microwave devices such as phase shifters or tunable matching networks. This publication covers the preparation of BST thick-films for microwave applications through inkjet printing. Two barium strontium titanate (BST) inks were prepared, printed on alumina substrates and sintered at different temperatures. The first ink was prepared with pure BST and sintered between 1100°C and 1200°C. The second ink was prepared with a BST–ZnO–B2O3 composition and was suitable to reduce the sintering temperature down to 800°C. The microstructure of the thick-films reveals the evolution of grain growth with increasing sintering temperature in the thick-films. Furthermore, a reaction with the substrate was observed for both inks at high sintering temperatures. The microwave characterization of the thick-films shows that for the permittivity and the tunability of the films, the effect of grain growth and reaction with the substrate compete against each other. Hence, the optimal microwave properties were achieved at a transition temperature, where first additional phases could already be observed. Even though, the properties are poorer for lower sintering temperatures, the investigations show that the preparation of silver- or gold-based metal–insulator–metal (MIM) structures through inkjet printing is possible with this composition. This allows various new design concepts for partly or fully inkjet printed passive microwave devices. Furthermore, it gives the opportunity for a future integration of passive tunable microwave devices in a low temperature co-fired ceramic (LTCC) fabrication process.

Direct inkjet printing of composite thin barium strontium titanate films

2003 ◽  
Vol 18 (12) ◽  
pp. 2820-2825 ◽  
Author(s):  
T. Kaydanova ◽  
A. Miedaner ◽  
C. Curtis ◽  
J. Alleman ◽  
J.D. Perkins ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Inkjet Printing ◽  
Root Mean Square Roughness ◽  
Metal Electrodes ◽  
Barium Strontium ◽  
Direct Current Bias ◽  
Metal Organic ◽  
Tan Δ

Composite Ba0.6Sr0.4TiO3/MgO thin films with 60% tuning and tan [H9254] of 0.007 at 2 GHz were deposited using metal organic decomposition inks by spin coating on single crystal MgO substrates. The films with approximately 1 mol% MgO in Ba0.6Sr0.4TiO3 had a better tuning/loss ratio than either the 0 or the 10 mol% MgO substituted films. Crystalline Ba0.5Sr0.5TiO3 films were produced on both MgO and alumina substrates by inkjet printing of metalorganic precursors with subsequent thermal decomposition followed by annealing at 900°C. Barium strontium titanate lines as narrow as 100 μm were printed on the alumina substrates. The inkjet-printed films were predominantly (100) oriented on MgO and (110) oriented on alumina. The crystalline quality of the inkjet-printed films was improved by annealing at 1100°C for 3 h in oxygen. Both the printed and the spin-coated films had smooth surfaces (300 Å root-mean-square roughness) as required for subsequent deposition of high-resolution metal electrodes. An inkjet-printed Ba0.5Sr0.5TiO3 film (3500 Å) on MgO annealed at 1100°C had 20% tunability of the dielectric constant (ε) at 9.1 V/μm direct current bias and tan δ < 0.002 at 1 MHz.

A phase shifter on a slot line loaded with varactors designed on the basis on nanodimensional films of barium-strontium titanate

2007 ◽  
Vol 52 (11) ◽  
pp. 1300-1304 ◽  
Author(s):  
Vas. M. Mukhortov ◽  
S. I. Masychev ◽  
Yu. I. Golovko ◽  
A. V. Chub ◽  
Vl. M. Mukhortov
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Phase Shifter ◽  
Slot Line ◽  
Barium Strontium

Structural, thermal and optoelectrical properties of pure and gadolinium doped barium strontium titanate for DSSC applications

2021 ◽  
Author(s):  
S. Karthikeyan ◽  
P. Thirunavukkarasu ◽  
S. Surendhiran ◽  
Y.A. Syed Khadar ◽  
A. Balamurugan ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Barium Strontium

Structural and Electrical Properties of Nanocrystalline Diamond based Barium Strontium Titanate Varactors

2008 ◽  
Vol 377 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Venkataramanan Gurumurthy ◽  
Sathyaharish Jeedigunta ◽  
Sam Baylis ◽  
Priscila Spagnol ◽  
John Bumgarner ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Nanocrystalline Diamond ◽  
Barium Strontium ◽  
Structural And Electrical Properties
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