Electrically small superconducting antennas with bandpass filters

Susumu Oda, S. Sakaguchi, H. Kanaya, R. K. Pokharel, K. Yoshida

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


In order to reduce the size of a wireless system, we have proposed the design formulas for an electrically small antenna (ESA), i.e. an antenna whose dimension is much smaller than a wavelength, with a miniaturized matching circuit which connects to a 50 Ω external circuit. Theoretical performances of the slot dipole antenna with the impedance matching circuit designed by the present theory are studied by the electrical circuits using transmission lines (Transmission Line Model) as well as the electromagnetic (EM) field simulator. We designed a slot dipole antenna with the aid of the simulations using the electrical circuits as well as the EM field simulator. The size of the designed antenna including the matching circuit is 4.1mm × 1.9mm on MgO substrate with relative permittivity of 9.6 at the center frequency of 5GHz, and the designed fractional bandwidth is 13% @RL (Return Loss) = -3 dB. In order to demonstrate the theory, we also carried out experiments on the slot dipole antenna with the matching circuits of pole number n = 2 using high temperature superconductors YBCO on MgO substrates in the 5 GHz band.

Original languageEnglish
Pages (from-to)878-881
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - Jun 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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