A technique is presented for improving the performance of low-profile, circularly polarized (CP) radiating-line antennas. The essential elements of the technique pertain to establishing a single traveling wave on an annular sector of conducting strip that is positioned parallel and close to a large conducting surface. The antenna is named the annular sector, radiating-line (ANSERLIN) antenna. Using this technique, the impedance bandwidth becomes so large that it no longer has any bearing on the operating bandwidth. Instead, the pattern shape and axial ratio become the factors that limit the bandwidth. Both senses of circular polarization can be transmitted or received from the same structure. Experimental results for two-port ANSERLIN antennas are presented. The method of exciting a traveling wave on the annular sector is discussed. Design parameters are given for an antenna that will produce a broadside axial ratio that is less than 0.5 dB at a specified frequency
J. L. Drewniak and P. E. Mayes, "ANSERLIN. A Broad-Band, Low-Profile, Circularly Polarized Antenna," IEEE Transactions on Antennas and Propagation, vol. 37, no. 3, pp. 281-288, Institute of Electrical and Electronics Engineers (IEEE), Mar 1989.
The definitive version is available at http://dx.doi.org/10.1109/8.18723
Electrical and Computer Engineering
Keywords and Phrases
ANSERLIN; Bandwidth; Broad-Band; Circularly Polarized Antenna; Dielectric Loading; Dielectric-Loaded Antennas; Radiating-Line Antennas; Polarization; Bandwidth; Impedance; Feeds; Conductors; Frequency; Microstrip Antennas; Spirals; Vehicles; Slot Antennas
International Standard Serial Number (ISSN)
Article - Journal
© 1989 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.