Microwave Phase Shifters Using Ferroelectric (Ba,Sr)TiO3 Films

2002 ◽  
Vol 720 ◽  
Author(s):  
Won-Jeong Kim ◽  
Eun-Kyoung Kim ◽  
Seung-Eon Moon ◽  
Seok-Kil Han ◽  
Su-Jae Lee ◽  
...  
Keyword(s):  
Phase Angle ◽  
Phase Shifter ◽  
Metal Layer ◽  
Bias Field ◽  
Phase Shifters ◽  
Metal Loss ◽  
Differential Phase ◽  
Bst Films ◽  
Dc Bias ◽  
Dc Bias Field

AbstractThe ferroelectric (Ba0.6Sr0.4)TiO3 (BST) films were prepared on (001) MgO single crystals by pulsed laser deposition. Coplanar waveguide (CPW) type phase shifters controlled by external dc bias field were fabricated on BST films using a 2 μm thick metal layer to reduce metal loss. Microwave properties of the CPW phase shifter were measured using a HP 8510C vector network analyzer from 0.1 – 20 GHz. The fabricated CPW phase shifters (8 mm long) exhibited differential phase angle of 100 ° at 10 GHz with a dc bias field of less than 80 kV/cm between center and ground conductors. Furthermore, a stable differential phase angle (102 ± 3.5 o) was observed from another CPW while changing the power of incident microwave from -10 to +30 dBm. Gap size dependent dielectric constant of the BST film was observed and a simple correction method was suggested in the paper. These results demonstrate the possible application of ferroelectric tunable devices on a high power tunable wireless telecommunication.

Frequency Agile Microwave Applications Using (Ba,Sr)TiO3/Y3Fe5O12 Multilayer Grown by Pulsed Laser Deposition

1999 ◽  
Vol 603 ◽  
Author(s):  
W.J. Kim ◽  
W. Chang ◽  
S.B. Qadri ◽  
H.D. Wu ◽  
J.M. Pond ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Phase Shift ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Bias Field ◽  
Laser Deposition ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Bst Films ◽  
Dc Bias

Abstract(Ba,Sr)TiO3 (BST) thin films have been deposited by pulsed laser deposition (PLD) onto single crystal Y3Fe5O12 (YIG) substrates with/without an MgO buffer layer. The structure and microwave properties of BST films have been investigated as function of substrate orientation and O2 deposition pressures (5-800m Torr). The orientation of BST film is varies with the deposition conditions. The dielectric constant, loss tangent, and change in dielectric constant with an applied electric field have been measured at room temperature using interdigitated capacitors at 0.1 – 20 GHz. Polycrystalline BST films have a high tunability (∼40%) with a dc bias field of 67kV/cm and a dielectric Q (=l/tanδ) between 30 and 40, while (001) oriented BST films have a lower tunability (∼20%) but higher dielectric Q (∼50). A coplanar waveguide transmission line was fabricated from a (001) oriented BST film on (111)YIG which exhibited a 17° differential phase shift with an applied dc bias of 21 kV/cm. An equivalent differential phase shift was achieved with a magnetic field of 160Guass.

Influence of Grain and Grain-Boundary Resistances on Dielectric Properties of KNbO3 Under Small DC Bias Field

2013 ◽  
Vol 96 (10) ◽  
pp. 3127-3132
Author(s):  
Sankaramangalam Ulhas Sharath ◽  
Rajesh Kumar Singh ◽  
  Raghvendra ◽  
Bheeshma Pratap Singh ◽  
Pravin Kumar ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Grain Boundary ◽  
Bias Field ◽  
Dc Bias ◽  
Dc Bias Field

scholarly journals Effects of AC- and DC-bias field poling on piezoelectric properties of Bi-based ceramics

2019 ◽  
Vol 127 (6) ◽  
pp. 353-356
Author(s):  
Sangwook KIM ◽  
Gopal Prasad KHANAL ◽  
Hyunwook NAM ◽  
Ichiro FUJII ◽  
Shintaro UENO ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Bias Field ◽  
Dc Bias ◽  
Dc Bias Field

Effect of a dc bias field on the dynamic hysteresis of single-domain ferromagnetic particles

2010 ◽  
Vol 107 (7) ◽  
pp. 073914 ◽  
Author(s):  
P. M. Déjardin ◽  
Yu. P. Kalmykov ◽  
B. E. Kashevsky ◽  
H. El Mrabti ◽  
I. S. Poperechny ◽  
...  
Keyword(s):  
Bias Field ◽  
Single Domain ◽  
Dynamic Hysteresis ◽  
Dc Bias ◽  
Ferromagnetic Particles ◽  
Dc Bias Field
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