NDLI: Improved feed system design for a wideband dipole array

Content Provider	IEEE Xplore Digital Library
Author	London, S.Y. Leonov, V.P. Koert, P. Susman, L.
Copyright Year	1998
Description	Author affiliation: Adv. Power Technol. Inc., Washington, DC, USA (London, S.Y.)
Abstract	A high power, wideband HF phased array is being constructed as part of the High Frequency Active Auroral Research Program (HAARP) in Galkona, Alaska. Extensive testing of a demonstration prototype (DP) version of the array discovered undesirable feed resonance effects at discrete frequencies and excessive tower currents under simulated scanned conditions. Analyses and subsequent measurements pointed to even mode excitations of the dipole as the cause of these difficulties. To solve this problem the feed system was modified with the goal of controlling both the even and odd mode excitations. A novel wideband high efficiency hybrid-balun and balanced AMU (antenna matching unit) was designed and tested confirming the superiority of the new feed arrangement. A low-band version is being incorporated into the DP testbed and extends the low-band performance by 20%, with lower loss and reduced tower currents. The feed design is further evaluated by calculating the average efficiency of the array system, which is within 0.25 to 1.5 dB of its theoretical maximum, depending on frequency.
Starting Page	97
Ending Page	100
File Size	290649
Page Count	4
File Format	PDF
ISBN	0780349555
DOI	10.1109/APWC.1998.730664
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-11-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feeds Wideband Frequency Testing Phased arrays Poles and towers Broadband antennas Hafnium Virtual prototyping Resonance
Content Type	Text
Resource Type	Article

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