Reconfigurable coplanar waveguide (CPW) and half-mode substrate integrated waveguide (HMSIW) band-stop filters using a varactor-loaded metamaterial-inspired open resonator

Journal ar
  • Volumen: 11
  • Número: 1
  • Fecha: 28 December 2017
  • ISSN: 19961944
  • Source Type: Journal
  • DOI: 10.3390/ma11010039
  • Document Type: Article
  • Publisher: MDPI AG Postfach Basel CH-4005
© 2017 by the authors. An open ring resonator (ORR) loaded with a varactor diode is designed and implemented in order to achieve high-performance tunable band-stop filters in planar technology with a compact size. This varactor-loaded ORR (VLORR) is versatile. It allows a shunt connection with different planar waveguide sections. In this paper, it has been connected to a coplanar waveguide (CPW) and a half-mode substrate integrated waveguide (HMSIW). As a reverse bias voltage is applied to the VLORR, a continuous tuning over the resulting stop-band can be achieved. To illustrate the possibilities of the VLORR, three prototypes have been designed, fabricated, and characterized. The three prototypes show an outstanding performance, with a rejection level at the resonant frequency and a tuning range greater than 12 dB and 85%, respectively. This VLORR has high potential value in microwave communication systems to eliminate unwanted signals.

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