Summary
International Symposium on Antennas and Propagation
2006
Session Number:1A2a
Session:
Number:1A2a-3
Excitation of Dipole Mode in Asymmetrical Ultra Low Profile Dipole Antenna
Takehiro Imura, Midori Okumura, Kazuhiro Kumamaru, Damri Radenamad, Yukio Kamata, Tadashi Takano,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
We have studied characteristics of the ULPD (Ultra low profile dipole) antenna in regard to the mode, the gain and the pattern. There are various problems in designing the ULPD antenna loaded on a satellite. The ULPD antenna is symmetry like a conventional half-wave dipole antenna, and has the vertical part on the center of the horizontal part. Sometimes, this is a serious limitation for the design of a satellite. Therefore, we want to improve the flexibility of the antenna. It is difficult that an asymmetrical ULPD (a-ULPD) antenna is driven a dipole mode only. In this research, by installation of a sperrtopf to vertical part of an a-ULPD antenna, the antenna is driven in a dipole mode only similar to the ULPD antenna. This is because the sperrtopf chokes the current on the vertical part and flow the current only on the horizontal part. The experimental result shows that it is possible to be driven in a dipole mode by the sperrtopf regardless of the location of the vertical part. This a-ULPD antenna with the sperrtopf gives the gain of 7.5??9.1 dBi and the radiation pattern similar to the ULPD antenna.