Evaluation of input impedance of a bidirectional antenna using a probe excited rectangular ring

Author

Kosulvit, Sompol ; Phongcharoenpanich, Chuwong ; Krairiksh, Monai ; Wakabayashi, Toshio

Author_Institution

Fac. of Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand

fYear

2000

fDate

15-18 Aug. 2000

Firstpage

650

Lastpage

653

Abstract

This paper presents the impedance characteristics of a bidirectional antenna using a probe excited rectangular ring. The field at the aperture is derived from the field inside the ring by using Green´s functions. The impedance of this antenna is realized by using the induced EMF method. The impedance of a probe with optimum ring length that provides the single mode is firstly determined. Then, the resultant input impedance of the antenna is the reciprocal of the combination of the probe admittance and both apertures admittance. Experimental results, verifying the impedance of the antenna, agree very well with the theoretical predictions. This antenna is suitable for a bidirectional base-station antenna in a street cell.

Keywords

Green´s function methods; UHF antennas; aperture antennas; directive antennas; electric admittance; 1.9 GHz; Green´s functions; aperture admittance; base-station antenna; bidirectional antenna; cellular radio; impedance characteristics; induced EMF method; input impedance; microcellular radio; probe admittance; probe excited rectangular ring; street cell; Admittance; Aperture antennas; Costs; Dielectric substrates; Directive antennas; Impedance; Information technology; Microcell networks; Mobile communication; Probes;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas, Propagation and EM Theory, 2000. Proceedings. ISAPE 2000. 5th International Symposium on

Conference_Location

Beijing, China

Print_ISBN

0-7803-6377-9

Type

conf

DOI

10.1109/ISAPE.2000.894870

Filename

894870