Communications: radio wave antennas – Antennas – Slot type
Patent
1996-01-11
1998-09-29
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Slot type
343770, 343895, H01Q 1310, H01Q 136
Patent
active
058151222
ABSTRACT:
A slot spiral antenna with a planar integrated balun and feed. The slot spiral is produced using standard printed circuit techniques and comprises a dielectric substrate having a conductive layer which is etched to form the radiating slot spiral. An integrated microstrip feed is included to provide a balanced feed to the slot spiral. Impedance matching is performed between the microstrip feed and the slotline of the slot spiral to maximize energy transfer. A shallow reflecting cavity is included to limit the spiral radiation to one direction. The described antenna apparatus provides a simple, broadband spiral antenna suitable for incorporating into the skin of a moving vehicle.
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Dual-Spiral Slot Antennas, K. Hirose, Prof. H. Nakano, IEE Proceedings-H, vol. 138. No. 1 Feb. 1991.
Nurnberger Michael W.
Volakis John L.
Le Hoanganh T.
The Regents of the University of Michigan
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