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Electronically tunable microstrip bandstop filters using a varactor-loaded open ring resonator (VLORR)

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Abstract

A compact microstrip bandstop filter (BSF) with a wide electronically tunable frequency range and a constant absolute bandwidth is presented. It consists of an open ring resonator (ORR) loaded with a varactor diode and connected to a section of a microstrip transmission line. As a reverse bias is applied to the proposed varactor-loaded ORR (VLORR), the value of the resulting capacitor is controlled and the resonant frequency can be varied to the desired position. The measured tunable BSF achieves 92.6 \(\,\%\) tuning range with a constant 15 dB absolute bandwidth of 0.27 GHz and a minimum rejection level of 37 dB. This reconfigurable microstrip BSF can be useful in microwave communication systems.

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Acknowledgements

This work was supported by Ministerio de Economía y Competitividad, Fundación Séneca (Murcia) of Spain and European Regional Development Funds (TEC2013-47037-C05-5-R, TEC2016-75934-C04-4-R, and 19494-PI-14).

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Authors and Affiliations

  1. Department of Electronics and Computer Engineering, Universidad Politécnica de Cartagena, Plaza del Hospital nº1, 30202, Cartagena, Murcia, Spain

    Juan Hinojosa, Adrián Saura-Ródenas & Félix L. Martínez-Viviente

  2. Department of Communications and Information Technologies, Universidad Politécnica de Cartagena, Plaza del Hospital nº1, 30202, Cartagena, Murcia, Spain

    Alejandro Alvarez-Melcon

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  1. Juan Hinojosa
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  2. Adrián Saura-Ródenas
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  3. Alejandro Alvarez-Melcon
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  4. Félix L. Martínez-Viviente
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Correspondence to Juan Hinojosa.

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Hinojosa, J., Saura-Ródenas, A., Alvarez-Melcon, A. et al. Electronically tunable microstrip bandstop filters using a varactor-loaded open ring resonator (VLORR). Appl. Phys. A 123, 477 (2017). https://doi.org/10.1007/s00339-017-1094-z

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