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A Frequency-Reconfigurable Microstrip Antenna with Constant Dipole-Like Radiation Patterns Using Single Bias, Triple Varactor Tuning with Reduced Complexity

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Abstract

This work proposes a novel frequency-reconfigurable circular patch antenna incorporated with a rectangular slot and a narrow slot capable of producing constant dipole-like radiation patterns. The antenna compactness is achieved with the integration of the rectangular slot defected ground structure (DGS) on the ground. The proposed antenna is able to perform continuous frequency tuning between 1.91 and 2.77 GHz with a frequency ratio of 1.5:1, in addition to stable dipole-like radiation patterns. The resonant frequency of the antenna is controlled by tuning a simple DC biasing network that consists of three RF varactor diodes located on the narrow slot DGS. Implementing the DC biasing network at the narrow slot DGS while maintaining the large slot DGS helps the antenna miniaturization and maintains the constant dipole-like radiation pattern over all frequency tuning range. The results are validated via simulations and experimental validations in terms of reflection coefficients and the radiation patterns. Measurements indicated that an impedance bandwidth of 85 MHz is featured for each tuned frequency band, with dipole-like patterns and an average gain of 1.57 dBi.

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Funding

The author would like to acknowledge the support from the Short-Term Research Grant (Mentorship) under a grant number of 9001–00600 from the Universiti Malaysia Perlis.

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Authors and Affiliations

  1. Advanced Communication Engineering (ACE), Centre of Excellence, Universiti Malaysia Perlis (UniMAP), Arau, Perlis, Malaysia

    Kabir Hossain, Thennarasan Sabapathy, Muzammil Jusoh, Mohamed Nasrun Osman, Mohd Najib Mohd Yasin & Hasliza A. Rahim

  2. Faculty of Electronic Engineering Technology, Universiti Malaysia Perlis (UniMAP), Arau, Perlis, Malaysia

    Kabir Hossain, Thennarasan Sabapathy, Muzammil Jusoh, Ping Jack Soh, R. Badlishah Ahmad, Mohd Ilman Jais, Mohamed Nasrun Osman, Mohd Najib Mohd Yasin & Hasliza A. Rahim

  3. Centre for Wireless Communications (CWC), University of Oulu, P.O. Box 4500, 90014, Oulu, Finland

    Ping Jack Soh

  4. Centre of Excellence Advance Computing (AdvComp), Universiti Malaysia Perlis (UniMAP), Arau, Perlis, Malaysia

    R. Badlishah Ahmad & Mohd Ilman Jais

  5. Chitkara University Institute of Engineering and Technology, Chitkara University Punjab, Chandigarh, India

    Nitin Saluja

  6. James Watt School of Engineering, University of Glasgow, Glasgow, UK

    Qammer H. Abbasi

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  1. Kabir Hossain
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  2. Thennarasan Sabapathy
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Contributions

Conceptual design: KH, TS, MJ and PJS. Investigation and Methodology: RBA, MIJ and MNO. Supervision: TS, MJ and MNO. Concept visualization: MNMY, HAR. Writing and editing: KH, PJS, NS and QHA.

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Correspondence to Thennarasan Sabapathy.

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Hossain, K., Sabapathy, T., Jusoh, M. et al. A Frequency-Reconfigurable Microstrip Antenna with Constant Dipole-Like Radiation Patterns Using Single Bias, Triple Varactor Tuning with Reduced Complexity. Wireless Pers Commun 123, 1003–1024 (2022). https://doi.org/10.1007/s11277-021-09167-8

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