improving the pass-band return loss in liquid crystal dual-mode bandpass filters by microstrip patch reshaping
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2014
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Abstract
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.
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torrecilla2014materialsimproving
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| Authors | ;Javier Torrecilla;Virginia Urruchi;José Manuel Sánchez-Pena;Noureddine Bennis;Alejandro García;Daniel Segovia |
| Journal | Nature Materials |
| Year | 2014 |
| DOI |
10.3390/ma7064524
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