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Materials 2018, 11(1), 39; doi:10.3390/ma11010039

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

1
Department of Electronics and Computer Engineering, Universidad Politécnica de Cartagena, Plaza del Hospital No. 1, 30202 Cartagena, Spain
2
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.
Received: 15 November 2017 / Revised: 22 December 2017 / Accepted: 27 December 2017 / Published: 28 December 2017
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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