A half-moon antenna

Author

Nakano, Hisamatsu ; Yamamoto, Yusuke ; Seto, Masaaki ; Hitosugi, Kazuo ; Yamauchi, Junji

Author_Institution

Coll. of Eng., Hosei Univ., Tokyo, Japan

Volume

52

Issue

12

fYear

2004

Firstpage

3237

Lastpage

3244

Abstract

This work presents a half-moon antenna (HMA), which is composed of two semi-circular top and bottom conducting plates joined by a rectangular conducting plate. The HMA has a wide radiation beam. Radiation in the y-z plane (in the E plane) is hemispherical with a half-power beam width (HPBW) of more than 200°. Radiation in the x-y plane (in the H plane) forms a sector beam with an HPBW of more than 100°. To reduce the backward radiation and improve the gain, chokes are added to the HMA. An increase in the gain of approximately 1 dB is obtained. In order to obtain a tilted beam, the radius of the bottom plate is reduced. The maximum beam direction of the tilted beam θ_max is not sensitive to frequency. Within a frequency range of 11 to 14 GHz (24%), θ_max=167°±2°. The gain is found to be G=9.5±0.5 dBi within this same frequency range.

Keywords

antenna radiation patterns; aperture antennas; conducting bodies; microwave antennas; 11 to 14 GHz; FDTD; HMA; HPBW; cylindrical finite-difference time-domain method; half-moon antenna; half-power beam width; rectangular conducting plate; small aperture antenna; tilted beam formation; wide radiation beam; Antenna radiation patterns; Aperture antennas; Finite difference methods; Frequency; Inductors; Performance analysis; Probes; Rectangular waveguides; Time domain analysis; Wireless LAN; 65; Cylindrical finite-difference time-domain; FDTD; method; small aperture antenna; tilted beam formation; wide radiation;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2004.836427

Filename

1364139