Bi-directionally fed phased-array antenna downsized with variable impedance phase shifter for ISM band

A novel bi-directionally fed phased-array antenna (BiPA) is presented. A BiPA can operate at half the phase shift of the conventional antenna with the same performance, leading to smaller size and lower cost. Main components of a BiPA are antenna elements and variable impedance phase shifters (VIPSs...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-07, Vol.54 (7), p.2962-2969
Main Authors: Tsuji, M., Nishikawa, T., Wakino, K., Kitazawa, T.
Format: Article
Language:English
Subjects:
Antenna accessories
Antenna array feeds
Antennas
Applied sciences
Bidirectional control
Capacitors
Circuit properties
Circuit simulation
Costs
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Impedance
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Performance evaluation
Phase shift
Phase shifters
phased arrays
Power dividers
RLC circuits
Sidelobes
Simulation
varactors
Voltage
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Summary:A novel bi-directionally fed phased-array antenna (BiPA) is presented. A BiPA can operate at half the phase shift of the conventional antenna with the same performance, leading to smaller size and lower cost. Main components of a BiPA are antenna elements and variable impedance phase shifters (VIPSs). The VIPS consists of three resonant circuits that include variable capacitors, it is applicable for both functions as a power divider and as an impedance-matching device, since the input/output impedance and the phase shift can be independently varied. The BiPA with a VIPS is simulated and evaluated at a 2.45-GHz industrial-scientific-medical band. The measured results agree well with the simulated ones. The performances of the VIPSs are confirmed as 1.4 dB in insertion loss, and -17dB in return loss for a phase shift of 0/spl sim/80/spl deg/ with the control voltage from 0- to 3.5-V DC, and the measured radiation pattern of the BiPA is /spl plusmn/30/spl deg/ in the steering angle, 24/spl deg/ in beamwidth, and -9dB in the sidelobe. Furthermore, an enhancement of the sidelobe suppression can be expected by changing the power ratio of each antenna element.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.877420