DocumentCode :
1431649
Title :
Calibratable adaptive antenna combiner at 5.2 GHz with high yield for laptop interface card
Author :
Ellinger, Frank ; Vogt, Rolf ; Bächtold, Werner
Author_Institution :
Lab. for Electromagnetic Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland
Volume :
48
Issue :
12
fYear :
2000
fDate :
12/1/2000 12:00:00 AM
Firstpage :
2714
Lastpage :
2720
Abstract :
This paper presents a calibratable adaptive antenna combiner with three branches for high-performance radio local area network at 5.2 GHz. The system was mounted on a reinforced duroid substrate and enables the integration in a laptop interface card. Each branch consists of a bent stacked slot antenna, a low-noise-amplifier monolithic microwave integrated circuit (MMIC) with antenna/calibration switching and a vector modulator MMIC with an amplitude control range of 15 dB and 3600 phase control range. The signals of the three branches are combined by an active adder MMIC. A calibration is proposed to significantly improve the phase and amplitude control resolution and the yield of the designed MMIC circuits, which were fabricated using a commercial GaAs process. Each branch has a maximum power gain of 16 dB, a noise figure of 3.3 dB, and a 1-dB output compression point of -4 dBm. The whole system draws less than 28 mA from a 2.7-V voltage supply. The total required MMIC chip size is 10.8 mm2
Keywords :
MMIC amplifiers; adaptive antenna arrays; calibration; power combiners; slot antennas; wireless LAN; 16 dB; 2.7 V; 28 mA; 3.3 dB; 5.2 GHz; MMIC chip size; active adder MMIC; amplitude control range; amplitude control resolution; antenna/calibration switching; bent stacked slot antenna; calibratable adaptive antenna combiner; laptop interface card; low-noise-amplifier monolithic microwave integrated circuit; maximum power gain; output compression point; radio local area network; reinforced duroid substrate; vector modulator MMIC; yield; Adaptive arrays; Calibration; Local area networks; MMICs; Microwave antennas; Microwave integrated circuits; Monolithic integrated circuits; Portable computers; Slot antennas; Switching circuits;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.899035
Filename :
899035
Link To Document :
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