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Tunable Terahertz Circularly Polarized Dielectric Resonator Antenna with the Higher Order Modes

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Abstract

A tunable terahertz (THz) dielectric resonator (DR) antenna (DRA) with circular polarization operating with multiple higher order modes is numerically studied and implemented. A rectangular DRA (RDRA) is designed with a length to width aspect ratio of the DR allowing the operation with the higher order modes. The RDRA provides the triple band response. The corners of the rectangular DR are perturbed diagonally and the generated electric and magnetic dipoles are controlled in the manner that the operating bands can be merged. The merging of the operating bands provides a wide impedance bandwidth. Also, the diagonal perturbation of the rectangular DR generates the orthogonal degenerate components of the operating modes which results in circular polarization. The different faces of the perturbed DR are coated with the graphene material. This allows the controlling of impedance matching and helps in achieving the wide overlapping impedance and axial ratio (AR) bandwidth along with the tunability. The antenna provides \(9.99\mathbf{\%} (3.3688-3.7232 \boldsymbol{T}\boldsymbol{H}\boldsymbol{z})\) impedance bandwidth and \(1.814\mathbf{\%} \left(3.6707-3.7379 \boldsymbol{T}\boldsymbol{H}\boldsymbol{z}\right)\) 3 dB AR bandwidth. The higher order modes result in providing the high gain of around 8 dBi and radiation efficiency around 80 %.

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Authors and Affiliations

  1. ECE Department, National Institute of Technology Patna, Patna, 800005, India

    Vishwanath, Gaurav Varshney & Bikash Chandra Sahana

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  1. Vishwanath
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  2. Gaurav Varshney
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Vishwanath, Varshney, G. & Sahana, B.C. Tunable Terahertz Circularly Polarized Dielectric Resonator Antenna with the Higher Order Modes. Silicon 14, 6279–6289 (2022). https://doi.org/10.1007/s12633-021-01398-5

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