Slot spiral antenna with integrated balun and feed
First Claim
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1. A slot spiral antenna apparatus comprising:
- a non-conductive substrate having first and second sides;
a conducting layer on said first side of said substrate, said conducting layer including at least one slotline having a slot arranged along a spiral curve;
a microstrip on said second side of said substrate, said microstrip configured to wind toward the center of said slotline and to provide a balanced feed to said slotline at a feed point to form a radiating element.
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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.
67 Citations
20 Claims
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1. A slot spiral antenna apparatus comprising:
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a non-conductive substrate having first and second sides; a conducting layer on said first side of said substrate, said conducting layer including at least one slotline having a slot arranged along a spiral curve; a microstrip on said second side of said substrate, said microstrip configured to wind toward the center of said slotline and to provide a balanced feed to said slotline at a feed point to form a radiating element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification