Microstrip Patch Radiating Elements for Circularly-Polarized Phased Array
November 2005
Paul G. Elliot, The MITRE Corporation
Mohamed S. Mahmoud, The MITRE Corporation
ABSTRACT
This report evaluates circularly-polarized single-probe fed
microstrip patch radiating elements for a low profile
phased array antenna. The design, measurements, and
computer modeling results are described for two designs:
one is a patent pending dual-slot on each side of the patch,
and the other is a conventional single slot design. Antenna
requirements also include: 14.40 to 15.35 GHz frequency
band, 2 dB axial ratio, and low VSWR with scan. The
patches were arrayed with 7 driven elements in an
equilateral triangular lattice. Electromagnetic computer
models accurately predicted performance. In particular,
the measured directivity was extremely close to the
computer model prediction, as was the frequency of best
axial ratio. However, the computer model usually
predicted better axial ratio and wider axial ratio
bandwidth than was realized in the measurements.
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phased-array antennas, microstrip
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