Split Coaxial Cable Medium for Tunable Artificial Dielectrics and Plasmas
Abstract
We introduce the Split Coaxial Cable Medium (SCCM), a mechanically tunable, capacitively loaded wire medium supporting artificial-dielectric and artificial-plasma Bloch regimes with high in-plane isotropy. Its unit cell comprises coaxial conductors interrupted by axial gaps. Relative axial displacement continuously varies their capacitive overlap and series capacitance while preserving the transverse lattice geometry and leaving the unit-cell inductance approximately unchanged. Equivalent RLC parameters are derived directly from the geometry and incorporated into complementary analytical models. A spatially dispersive local-field model predicts the Bloch dispersion and isofrequency contours, whereas a multilayer homogenization model provides the modal impedance, closed-form estimates of the low-frequency Bloch refractive index and plasma frequency, and loss-inclusive finite-slab scattering. Full-wave eigenmode and finite-slab simulations validate the predictions. Over the investigated displacement range, simulations yield tunabilities of 46% in the low-frequency Bloch refractive index, from n0,min=1.42 to n0,max=2.28, and 21% in the plasma frequency, from fp,min=9.45 GHz to fp,max=11.61 GHz, while confirming high in-plane isotropy near the Γ point in both regimes. These characteristics make the SCCM promising for gradient-index devices, directive antennas, and tunable plasma haloscopes.
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BibTeX
@misc{zhuravlev2026split,
title = {{Split Coaxial Cable Medium for Tunable Artificial Dielectrics and Plasmas}},
author = {Alexander Zhuravlev and Jim A. Enriquez and Pavel A. Belov and Juan D. Baena},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.26815},
eprint = {2608.26815},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.26815},
}
RIS
TY - UNPB
TI - Split Coaxial Cable Medium for Tunable Artificial Dielectrics and Plasmas
AU - Alexander Zhuravlev
AU - Jim A. Enriquez
AU - Pavel A. Belov
AU - Juan D. Baena
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2608.26815
UR - https://arxiv.org/abs/2608.26815
AB - We introduce the Split Coaxial Cable Medium (SCCM), a mechanically tunable, capacitively loaded wire medium supporting artificial-dielectric and artificial-plasma Bloch regimes with high in-plane isotropy. Its unit cell comprises coaxial conductors interrupted by axial gaps. Relative axial displacement continuously varies their capacitive overlap and series capacitance while preserving the transverse lattice geometry and leaving the unit-cell inductance approximately unchanged. Equivalent RLC parameters are derived directly from the geometry and incorporated into complementary analytical models. A spatially dispersive local-field model predicts the Bloch dispersion and isofrequency contours, whereas a multilayer homogenization model provides the modal impedance, closed-form estimates of the low-frequency Bloch refractive index and plasma frequency, and loss-inclusive finite-slab scattering. Full-wave eigenmode and finite-slab simulations validate the predictions. Over the investigated displacement range, simulations yield tunabilities of 46% in the low-frequency Bloch refractive index, from n_0,min=1.42 to n_0,max=2.28, and 21% in the plasma frequency, from f_p,min=9.45 GHz to f_p,max=11.61 GHz, while confirming high in-plane isotropy near the Γ point in both regimes. These characteristics make the SCCM promising for gradient-index devices, directive antennas, and tunable plasma haloscopes.
ER -