DocumentCode :
587640
Title :
The off-axis, time-domain response of conical log spiral antennas
Author :
McLean, James ; Sutton, Robert ; Foltz, Heinrich
Author_Institution :
TDK R&D Corp., Cedar Park, TX, USA
fYear :
2012
fDate :
12-13 Nov. 2012
Firstpage :
1
Lastpage :
4
Abstract :
The time-domain response of the wire conical log spiral antenna is examined for directions off of the principal axis using numerical simulation. The impetus for this is that the wire conical log spiral antenna, which incorporates an infinite balun, is a single-port, circularly-polarized antenna which does not contain any mechanisms that intrinsically limit the frequency response, e.g. transformer-based balancing networks or 90-degree hybrid networks. It is shown that the time-domain pulse distortion is similar to that of other frequency-independent antennas and that antenna-to-antenna transmission is not rotation invariant in the time domain, but rather undergoes a fractional Hilbert transform with rotation angle. The fractional Hilbert transform due to rotation about the line of sight is shown to hold off the bore sight axis.
Keywords :
Hilbert transforms; spiral antennas; time-domain analysis; 90-degree hybrid networks; antenna-to-antenna transmission; conical log spiral antennas; fractional Hilbert transform; frequency response; frequency-independent antennas; infinite balun; numerical simulation; rotation angle; single-port antenna; time-domain pulse distortion; time-domain response; transformer-based balancing networks; Broadband antennas; Broadband communication; Polarization; Spirals; Time domain analysis; Conical Log Spiral; circular polarization; dispersion; distortion; pulse fidelity; pulse response;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Conference (LAPC), 2012 Loughborough
Conference_Location :
Loughborough
Print_ISBN :
978-1-4673-2218-8
Electronic_ISBN :
978-1-4673-2219-5
Type :
conf
DOI :
10.1109/LAPC.2012.6402987
Filename :
6402987
Link To Document :
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