Airborne IFF antenna with switchable multiple patterns
First Claim
1. An IFF airborne antenna comprising:
- a single primary radiating element formed by a wide-band bent-back monopole;
a plurality of nuisance elements proximal to said primary radiating element; and
switching means connected between each of said nuisance elements and ground wherein said switching means switch each of said nuisance elements selectively between an inert state and a grounded state wherein the electrical and geometric characteristics of said radiating element and of said nuisance elements and the switching of said switching means provide modification of a characteristic pattern of said primary radiating element in order to provide an antenna output which is one of an omnidirectional pattern corresponding to pattern of an IFF surveillance mode, a first directional pattern corresponding to a fore directional pattern in an IFF interrogation mode in accordance with a first IFF standard on a first frequency band, a second directional pattern corresponding to said fore directional pattern in said IFF interrogation mode in accordance with a second IFF standard on a second frequency band which said second frequency band is different from said first frequency band, a third directional pattern corresponding to monitoring pattern in said IFF interrogation mode in accordance with said first IFF standard and a fourth directional pattern corresponding to said monitoring pattern in said IFF interrogation mode in accordance with said second IFF standard.
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Accused Products
Abstract
An IFF airborne antenna including a single primary radiating element 20 with a plurality of nuisance elements 30, 40, 50 associated with the primary radiating element is disclosed in conjunction with a switching device for switching respective nuisance elements so as to selectively modify the characteristics pattern of the primary radiating element in order to obtain either an omnidirectional pattern corresponding to the pattern of the IFF surveillance mode or a first directional pattern corresponding to the fore directional pattern in the IFF interrogation mode or a second directional pattern corresponding to the monitoring pattern in the IFF interrogation mode. The switching of the nuisance elements makes it possible to selectively obtain the fore directional pattern corresponding either to a first IFF standard (Western standard) on a first frequency band or to a second IFF standard (Eastern standard) on a second frequency band which is different from the first frequency band.
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Citations
9 Claims
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1. An IFF airborne antenna comprising:
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a single primary radiating element formed by a wide-band bent-back monopole; a plurality of nuisance elements proximal to said primary radiating element; and switching means connected between each of said nuisance elements and ground wherein said switching means switch each of said nuisance elements selectively between an inert state and a grounded state wherein the electrical and geometric characteristics of said radiating element and of said nuisance elements and the switching of said switching means provide modification of a characteristic pattern of said primary radiating element in order to provide an antenna output which is one of an omnidirectional pattern corresponding to pattern of an IFF surveillance mode, a first directional pattern corresponding to a fore directional pattern in an IFF interrogation mode in accordance with a first IFF standard on a first frequency band, a second directional pattern corresponding to said fore directional pattern in said IFF interrogation mode in accordance with a second IFF standard on a second frequency band which said second frequency band is different from said first frequency band, a third directional pattern corresponding to monitoring pattern in said IFF interrogation mode in accordance with said first IFF standard and a fourth directional pattern corresponding to said monitoring pattern in said IFF interrogation mode in accordance with said second IFF standard. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification