Electrically tunable materials for microwave applications

Aftab Ahmed, Irene A. Goldthorpe, Amir K. Khandani

Research output: Contribution to journalReview articlepeer-review

132 Scopus citations


Microwave devices based on tunable materials are of vigorous current interest. Typical applications include phase shifters, antenna beam steering, filters, voltage controlled oscillators, matching networks, and tunable power splitters. The objective of this review is to assist in the material selection process for various applications in the microwave regime considering response time, required level of tunability, operating temperature, and loss tangent. The performance of a variety of material types are compared, including ferroelectric ceramics, polymers, and liquid crystals. Particular attention is given to ferroelectric materials as they are the most promising candidates when response time, dielectric loss, and tunability are important. However, polymers and liquid crystals are emerging as potential candidates for a number of new applications, offering mechanical flexibility, lower weight, and lower tuning voltages.

Original languageEnglish (US)
Article number011302
JournalApplied Physics Reviews
Issue number1
StatePublished - Mar 1 2015
Externally publishedYes

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© 2015 AIP Publishing LLC.


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