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|Title:||Effect of polyimide layers on the permittivity tuning range of liquid crystals|
|Citation:||Proceedings of the 6th European Conference on Antennas and Propagation, held in Prague on 26-30 March, 2012, pp.3579-3582|
|Conference Name:||European Conference on Antennas and Propagation (6th : 2012 : Prague)|
|Pouria Yaghmaee, Thomas Kaufmann, Bevan Bates and Christophe Fumeaux|
|Abstract:||Liquid crystals have potential applications in the design of tunable microwave devices. Polyimide films are commonly incorporated in designs to achieve reproducible molecule alignment in the unbiased state. In this investigation two separate resonator elements are designed and investigated: One is fabricated with polyimide layers and one without. Experimental results obtained with a patch resonator illustrate that about half of the maximum tuning range is achieved without polyimide layers. Since substrates able to sustain a temperature range of 180-300 °C are required for the polyimide film curing process, avoiding polyimide enables using even lower heat resistant substrates for various tunable microwave applications and can lead to faster fabrication processes.|
|Keywords:||Component; tunable devices; liquid crystal (LC); polyimide film; tunable resonator|
|Rights:||© 2012 IEEE|
|Appears in Collections:||Electrical and Electronic Engineering publications|
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