High-T/sub c/ superconducting small antennas

Author

Itoh, K. ; Ishii, O. ; Nagai, Y. ; Suzuki, N. ; Kimachi, Y. ; Michikami, O.

Author_Institution

NTT Interdisciplinary Res. Lab., Ibaraki, Japan

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2836

Lastpage

2839

Abstract

The authors describe the designs of and report experimental results for one- and two-element high-T/sub c/ superconducting small antennas composed of self-resonant helical radiators and quarter-wave matching circuits. A 500-MHz-band antenna using a lambda /40 ( lambda is the free-space wavelength) radiator fabricated with Bi(Pb)SrCaCuO bulk realized a gain of -1.2 dBi, which indicates that this antenna achieves a high frequency of 70%. A 900-MHz-band two-element array antenna using lambda /20 radiator with a lambda /11 element spacing was designed to obtain a superdirective radiation pattern. The array antenna thus fabricated with YBaCuO bulk realized both a higher efficiency than a Cu antenna and a unidirectional radiation pattern. Furthermore, by adopting EuBaCuO thin-film meander lines as the matching circuit, the total length could be reduced to about 1/4 that of an antenna using a linear circuit.<>

Keywords

bismuth compounds; calcium compounds; high-temperature superconductors; microwave antennas; strontium compounds; superconducting microwave devices; 500 MHz; 900 MHz; BiPbSrCaCuO; band antenna; high temperature superconductor; quarter-wave matching circuits; self-resonant helical radiators; superconducting small antennas; superdirective radiation pattern; Antenna arrays; Antenna radiation patterns; Dipole antennas; Directive antennas; Equivalent circuits; Feeds; Helical antennas; Impedance; Linear antenna arrays; Resonance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233992

Filename

233992