Communications: radio wave antennas – Antennas – Microstrip
Patent
1990-09-18
1992-06-23
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
343846, H01Q 138, H01Q 2124
Patent
active
051247135
ABSTRACT:
A planar antenna is described which employs a thin patch of conductive material supported above and substantially parallel to a closely spaced thin conductive ground surface. Two or more narrow slots are positioned in the ground surface beneath the conductive patch. A microstrip transmission line, placed below the ground surface, excites the slots in series. The length of the microstrip line between the slots, the position of the microstrip line across the slots, and the dimensions of the slots are chosen to excite two orthogonal modes in the conductive patch in phase quadrature. This excitation results in a planar antenna which receives and transmits electromagnetic waves of circular polarization. The antenna may also employ a coplanar waveguide transmission line instead of the aformentioned microstrip transmission line. The coupling apertures then form slot discontinuities in series with the coplanar transmission line, which are positioned under the conductive patch. The antenna may also employ several conductive patches stacked over each other in a parallel fashion to enhance antenna performance.
REFERENCES:
patent: 2654842 (1953-10-01), Engelmann
patent: 4903033 (1990-02-01), Tsao et al.
Breithaupt, "Conductance Data for Offset Series Slots in Stripline", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-16, No. 11, Nov. 1968, pp. 969-970.
John L. Kerr, "Microstrip Polarization Techniques", Sep., pp. 1-17, U.S. Army Surveillance and Target Acquision Laboratory, Fort Monmouth, N.J. 07703.
M. Irsadi Aksun et al. "On Slot-Coupled Microstrip Antennas and Their Application to CP Operation-Theory and Experiment", IEEE Transactions on Antennas and Propagation, Aug. 1990, pp. 1224-1230.
Andrew Adrian, "Investigation of Some Antenna Elements for Advanced Phased Arrays", May 1987, pp. 1-137, Master of Science, Electrical and Computer Engineering, Univ of Mass.
Gentle James R.
Mayes Paul E.
Smith Hugh K.
Koffsky David N.
Wimer Michael C.
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