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US 4,225,869 AGranted
Multislot bicone antenna
AssigneeThe United States of America as represented by the Secretary of the Army
InventorDieter R. Lohrmann
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Abstract
A compact multi-cone antenna is disclosed wherein quarter wavelength cones re utilized at each slot of a slotted ring antenna. The cones are selected to be quarter wavelength in order to provide an impedance transformation for better impedance matching with free space. The individual cones are chosen to have different characteristic impedances in order to provide the antenna with a sharp disc-like radiation pattern.
Claims9
An antenna comprising:
- (a) wave conducting means having a characteristic impedance;
- (b) a plurality of interruptions in the form of a slot in said wave conducting means for radiating electromagnetic waves;
- (c) matching means associated with said interruptions for providing impedance transformation of free space transmission impedance to a value more compatable with said characteristic impedance of said wave conducting means, said matching means comprising bi-conical segments having a predetermined opening angle and extending from said wave conducting means substantially by one-quarter electrical wavelength;
- and
- (d) means for shaping the radiation pattern of said antenna to minimize side lobes and to provide a flattened disc-like radiation pattern comprising a plurality of said bi-conical matching means associated with at least two of said plurality of interruptions, said at least two bi-conical matching means having different opening angles and thereby having differing characteristic impedances, for achieving said disc-like radiation pattern.
2 more elements
Dependencies are inferred from the claim text.