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An impedance matched phase shifter using BaSrTiO3 thin film

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10 Author(s)
Qingduan Meng ; Inst. of Phys. & Beijing Nat. Lab. for Condensed Matter Phys., Chinese Acad. of Sci., Beijing, China ; Xueqiang Zhang ; Fei Li ; Jiandong Huang
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We present a distributed phase shifter with an equal ripple return loss at its operation frequency range. The phase shifter is based on a periodic structure and consists of a coplanar waveguide (CPW) line periodically loaded with voltage-variable barium strontium titanate (BST) interdigitated capacitors. Measurements show that its return loss is better than -15dB at frequencies from direct current to 16GHz, and at 9.4GHz, its phase shift is 41° under 120-V applied bias voltage.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 6 )