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Open AccessArticle

Reconfigurable Coplanar Waveguide (CPW) and Half-Mode Substrate Integrated Waveguide (HMSIW) Band-Stop Filters Using a Varactor-Loaded Metamaterial-Inspired Open Resonator

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Department of Electronics and Computer Engineering, Universidad Politécnica de Cartagena, Plaza del Hospital No. 1, 30202 Cartagena, Spain
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Department of Information and Communications Technology, Universidad Politécnica de Cartagena, Plaza del Hospital No. 1, 30202 Cartagena, Spain
*
Author to whom correspondence should be addressed.
Materials 2018, 11(1), 39; https://doi.org/10.3390/ma11010039
Received: 15 November 2017 / Revised: 22 December 2017 / Accepted: 27 December 2017 / Published: 28 December 2017
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. View Full-Text
Keywords: coplanar waveguide (CPW); metamaterials; microwave filters; substrate integrated waveguide (SIW); tunable devices; varactor diode coplanar waveguide (CPW); metamaterials; microwave filters; substrate integrated waveguide (SIW); tunable devices; varactor diode
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Hinojosa, J.; Saura-Ródenas, A.; Alvarez-Melcon, A.; Martínez-Viviente, F.L. Reconfigurable Coplanar Waveguide (CPW) and Half-Mode Substrate Integrated Waveguide (HMSIW) Band-Stop Filters Using a Varactor-Loaded Metamaterial-Inspired Open Resonator. Materials 2018, 11, 39.

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