In this letter the advantages offered by ε‐near‐zero materials as substrates for horizontal dipole antennas near a ground plane are theoretically studied. From the previous work it is known that substrates with extremely low values of permittivity dramatically enhance radiation from horizontal currents over a ground plane. On the other hand, as reported in this letter, frequency dispersion and the finite size of the substrate limit the achievable enhancement in antenna performance.
- dipole antenna
- conducting surface
- near-zero permittivity
- quality factor
Hirvonen, M., & Tretyakov, S. A. (2008). Near-zero permittivity substrates for horizontal antennas: Performance enhancement and limitations. Microwave and Optical Technology Letters, 50(10), 2674-2677. https://doi.org/10.1002/mop.23739