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http://dx.doi.org/10.12673/jkoni.2013.17.6.720

The Effect of Top-electrode Perimeter on the Tunability of Tunable Varactors Based on a BZN/BST/BZN Thin Film  

Lee, Young Chul (Department of Electronics, Mokpo National Maritime University)
Lee, Baek Ju (Department of Materials Science and Engineering, Ajou University)
Ko, Kyung Hyun (Department of Materials Science and Engineering, Ajou University)
Publication Information
Journal of Advanced Navigation Technology / v.17, no.6, 2013 , pp. 720-725 More about this Journal
Abstract
This paper has presented that fringing-electric fields enhanced by a finger-type electrode can improve the tunability of the tunable capacitor. Its top electrodes with different area and line width are designed in types of the finger for a long conducting perimeter. The tunable varactors were fabricated on a quartz substrate employing a multi-layer dielectric of a para/ferro/para-electric thin film. Compared to the conventional capacitor, finger-type capacitors are analyzed in terms of effective capacitance and tunablility. Their effective capacitance and tunability of the varactors with the long perimeter increase 24~40 % and 7~12 %, respectively, due to enhanced fringing electric fields from 1 to 2.5 GHz.
Keywords
Ferroelectric; Paraelectric; Tunable capacitor; Multi-layer dielectric;
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