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Vol.27 No.2(1992.6)
Research Report
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| Phased Array Antenna
System for Land Vehicle Satellite Communications |
Kunitoshi Nishikawa, Kazuo Sato,
Tomoaki Hirako, Mitoshi Fujimoto,
Takatoshi Kato, Yuichi Tanaka
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A planar phased array
antenna has been developed as one of land vehicle
antennas to conduct various experiments for future
satellite communication services. The antenna has
a 19 elements array with stacked circular micro-strip
patches and is arranged in a triangular lattice
fashion. The beam is controlled by using 3-bit phase
shifters. In order to realize thin configuration,
the antenna has a layer structure consisting of
an array antenna element layer, a phase shifter
layer and a drive circuit layer. The total height
is less than 30mm. A gain is 10.5dBi minimum throughout
the beam coverage of 30 to 90 in elevation, while
an axial ratio is less than 3dB. Furthermore we
have confirmed by testing with the satellite ETS-V
that the phased array antenna and beam tracking
system functions very well. The phased array antenna
has advantages such as its conformability to a car
roof and beam agility. Although it is still expensive,
the manufacturing cost will be reduced by increasing
the production quantity and enhancing research efforts
in the future.
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