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Journal Articles IEEE Transactions on Microwave Theory and Techniques Year : 2007

A 360 degrees BST phase shifter with moderate bias voltage at 30 GHz

Abstract

Paraelectric BaSrTiO 3 films deposited by sol-gel have been investigated from 1 kHz to 40 GHz using coplanar waveguides, resonators, and inter-digitated capacitances. At room temperature and without bias, the dielectric constant epsiv r is around 300 and the loss tangent is 5times10 -2 . Tunability is 40% for a 40-V bias voltage. Analog phase-shifter circuits were subsequently fabricated in order to obtain a 360deg phase shift in the Ka-band with a moderate bias voltage. The lowest bias value was 17 V at 40 GHz, whereas 40 V were necessary at 30 GHz. For the latter condition, the insertion loss was -6dB. The best figure-of-merit of the phase shifters with a loading factor of 1.4 was 27deg/dB. These results show an improvement in terms of voltage-controlled tunability
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Dates and versions

hal-00255772 , version 1 (14-02-2008)

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Gabriel Vélu, Karine Blary, Ludovic Burgnies, Aurélien Marteau, Gregory Houzet, et al.. A 360 degrees BST phase shifter with moderate bias voltage at 30 GHz. IEEE Transactions on Microwave Theory and Techniques, 2007, 55, pp.438-444. ⟨10.1109/TMTT.2006.889319⟩. ⟨hal-00255772⟩
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