Note: Tunable notch filter based on liquid crystal technology for microwave applications Articles uri icon

publication date

  • February 2013

issue

  • 2

volume

  • 84

international standard serial number (ISSN)

  • 0034-6748

electronic international standard serial number (EISSN)

  • 1089-7623

abstract

  • In this work, a compact design of an electrically tunable notch filter, based on liquid crystal (LC) technology, has been designed, manufactured, and characterized. The proposal has been achieved through particular configuration schemes with low cost inverted-microstrip structures and conventional spurlines structures due to its ease of integration. Central frequency tunability has been induced by applying low ac voltages, thus involving low power consumption. For these devices, filter responses have been approached specifically at microwave C-band frequency allocated for many satellite communications applications. Also, it has taken advantage of new highly anisotropic nematic LC mixtures at those frequency ranges.

keywords

  • liquid crystals; microwaves; notch filters; permittivity; anisotropy; liquid crystal devices; liquid dielectrics; materials properties; radiowave and microwave technology; telecommunications