Title :
Carrier power to intermodulation-distortion power-ratio-increasing technique in active phased-array antenna systems
Author :
Kaho, Takana ; Nakagawa, Tadao ; Araki, Katsuhiko ; Horikawa, Kohji
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Yokosuka, Japan
fDate :
12/1/2002 12:00:00 AM
Abstract :
This paper describes a novel technique to compensate for the intermodulation (IM) distortion components of high-power amplifiers in an active phased-array antenna system. This technique uses IM phase control to break the strong association between carriers and IM components, and can make the radiation patterns of carriers and IM components different on active phased-array antenna systems. As a result, carrier power to IM power ratio (CAM) is increased in the carrier-beam direction. A newly developed IM controller can increase the C/IM of near-saturated solid-state power amplifiers and, therefore, achieve high power efficiency. This paper shows experimental results confirming this technique using a six-element linear array.
Keywords :
MMIC; UHF antennas; UHF power amplifiers; active antenna arrays; antenna phased arrays; antenna radiation patterns; intermodulation distortion; linear antenna arrays; microwave antenna arrays; microwave power amplifiers; phase control; satellite antennas; GaAs; GaAs chip; IM controller; IM distortion components; IM phase control; MMIC; active phased-array antenna system; carrier power to IM power ratio; carrier-beam direction; high power efficiency; high-power amplifiers; intermodulation distortion components; mobile satellite communication systems; near-saturated solid-state power amplifiers; radiation patterns; satellite communication on-board systems; six-element linear array; Antenna accessories; Antenna radiation patterns; Control systems; High power amplifiers; MMICs; Nonlinear distortion; Predistortion; Radiofrequency amplifiers; Satellite broadcasting; Satellite communication;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2002.805136