Spirapole antenna for communication systems utilizing both satellite and terrestrial assets

• Published in: IEEE transactions on antennas and propagation 2005-02, Vol.53 (2), p.866-869
• Main Authors: Colburn, J.S., Lynch, J.J., Obatoyinbo, A., Talty, T.
• Format: Article
• Language: English
• Subjects: Antenna radiation patterns; Antennas; Applied sciences; Arm; Artificial satellites; Dielectrics; Direct broadcast satellite; dual pattern antenna; Exact sciences and technology; Loaded antennas; Polarization; Radiocommunications; Satellite antennas; Satellite broadcasting; Satellite telecommunications. Space telecommunications; spiral; Spirals; Telecommunications; Telecommunications and information theory; top loaded monopole; Transmitting antennas
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2004.841270

In this paper an antenna is presented that satisfies the two-fold radiation pattern requirement of communication systems utilizing both geostationary satellites and terrestrial transponders for coverage of mobile terminal away from the equator. A typical requirement for such a system is a low profile antenna that maximizes left-hand circularly polarized radiation in the satellite viewing angle, from 30/spl deg/ to 70/spl deg/ from zenith, and vertically polarized radiation in the terrestrial station viewing angle, from 70/spl deg/ to 90/spl deg/ from zenith. This dual radiation pattern coverage is achieved by integrating a small four arm spiral with a top loaded monopole into a single compact volume, an antenna termed a spirapole.