Layout Optimization of Small-Size Ferroelectric Parallel-Plate Varactors
Journal article, 2010

The extremely high permittivity of ferroelectric varactors (typically epsilon(r) >) imposes specific design and fabrication constraints for microwave and millimeter-wave applications. In this paper, small-size parallel-plate ferroelectric varactors insensitive to fabrication misalignment tolerances are studied experimentally. It is shown that the total resistance of the varactors strongly depends on the shape factor of the plates. Moreover, due to the small sizes of the varactors, the interconnecting strips become narrow and their contribution to the total resistance dominates. A simple procedure for optimization of the shape factor to minimize the varactor resistance is proposed.


layout optimization

passive circuits




Ferroelectric capacitors


Martin Norling

Chalmers, Applied Physics, Physical Electronics

Dan Kuylenstierna

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Andrei Vorobiev

Chalmers, Applied Physics, Physical Electronics

Spartak Gevorgian

Chalmers, Applied Physics, Physical Electronics

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN) 15579670 (eISSN)

Vol. 58 6 1475-1484 5458047

Areas of Advance

Information and Communication Technology

Nanoscience and Nanotechnology

Materials Science

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Sustainable development

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Materials Engineering

Physical Sciences

Electrical Engineering, Electronic Engineering, Information Engineering


Basic sciences



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