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Open AccessArticle

Improving the Pass-Band Return Loss in Liquid Crystal Dual-Mode Bandpass Filters by Microstrip Patch Reshaping

1
Departamento de Tecnología Electrónica, Universidad Carlos III de Madrid, C.\Butarque n° 15, Leganés 28911, Spain
2
Institute of Applied Physics, Military University of Technology, Kaliskiego 2, Warsaw 00-908, Poland
3
Departamento de Teoría de la Señal y Comunicaciones, Universidad Carlos III de Madrid, C.\Butarque n° 15, Leganés 28911, Spain
*
Author to whom correspondence should be addressed.
Materials 2014, 7(6), 4524-4535; https://doi.org/10.3390/ma7064524
Received: 28 February 2014 / Revised: 1 April 2014 / Accepted: 3 June 2014 / Published: 13 June 2014
(This article belongs to the Special Issue Liquid Crystals)
In this paper, the design and experimental characterization of a tunable microstrip bandpass filter based on liquid crystal technology are presented. A reshaped microstrip dual-mode filter structure has been used in order to improve the device performance. Specifically, the aim is to increase the pass-band return loss of the filter by narrowing the filter bandwidth. Simulations confirm the improvement of using this new structure, achieving a pass-band return loss increase of 1.5 dB at least. Because of the anisotropic properties of LC molecules, a filter central frequency shift from 4.688 GHz to 5.045 GHz, which means a relative tuning range of 7.3%, is measured when an external AC voltage from 0 Vrms to 15 Vrms is applied to the device. View Full-Text
Keywords: liquid crystals; tunable devices; dual-mode filters; inverted-microstrip structure; microwave frequencies liquid crystals; tunable devices; dual-mode filters; inverted-microstrip structure; microwave frequencies
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Torrecilla, J.; Urruchi, V.; Sánchez-Pena, J.M.; Bennis, N.; García, A.; Segovia, D. Improving the Pass-Band Return Loss in Liquid Crystal Dual-Mode Bandpass Filters by Microstrip Patch Reshaping. Materials 2014, 7, 4524-4535.

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