Antenna system for a jamming transmitter
First Claim
1. An antenna for a jammer which is to protect both a distant object for external protection as well as itself or an object located in its immediate proximity for self-protection, comprising a first antenna provided for external protection and a second antenna for self-protection, and said two antennas exhibit a sharply focused radiation pattern in the horizontal azimuth plane and a radiation pattern (7, 8) optimized for external protection or, respectively, self-protection in the vertical elevation plane in such a manner that the radiation pattern (7) of the first external protection antenna is a cosec2 pattern in the vertical plane or is at least an approximation to a cosec2 pattern and the radiation pattern (8) of the second self-protection antenna is a pattern having essentially the shape of a semicircle whose diameter extends in the direction of the zenith but which breaks off at the mean elevation angle range, and said first and second antennas, are structurally combined and means connected to said antennas for rotating them in the horizontal plane about a vertical axis such as surveillance radar antennas.
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Accused Products
Abstract
This invention relates to an antenna system for a jamming transmitter which is intended to protect a remote object which is remote from the jamming transmitter as well as itself or an object in the immediate vicinity of the jamming transmitter. Known jammer antennas for this purpose radiate either a pencil beam which presents considerable problems in the alignment and orientation and tracking in two planes or alternatively such known antennas are designed as omni directional antenna which however have low antenna gain and are easily detected. In the present invention the difficulties of the prior art are eliminated in that a separate antenna is provided for external or foreign protection and a separate antenna for self protection which antennas produced in the first plane a sharply focused pattern and in a plane perpendicular thereto a radiation pattern (7, 8) which is optimized for external or foreign protection or self protection, respectively. The two antennas can be switched and are structurally combined and designed to be jointly rotatable in the first plane. A single antenna can also be provided which can be tilted between two positions one for external or foreign protection and the other position for self protection so as to transmit and radiate instead of two separately optimized patterns a single pattern which is a mean of the two desired patterns.
41 Citations
14 Claims
- 1. An antenna for a jammer which is to protect both a distant object for external protection as well as itself or an object located in its immediate proximity for self-protection, comprising a first antenna provided for external protection and a second antenna for self-protection, and said two antennas exhibit a sharply focused radiation pattern in the horizontal azimuth plane and a radiation pattern (7, 8) optimized for external protection or, respectively, self-protection in the vertical elevation plane in such a manner that the radiation pattern (7) of the first external protection antenna is a cosec2 pattern in the vertical plane or is at least an approximation to a cosec2 pattern and the radiation pattern (8) of the second self-protection antenna is a pattern having essentially the shape of a semicircle whose diameter extends in the direction of the zenith but which breaks off at the mean elevation angle range, and said first and second antennas, are structurally combined and means connected to said antennas for rotating them in the horizontal plane about a vertical axis such as surveillance radar antennas.
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14. An antenna system for a jamming transmitter which is intended to provide remote protection for a remote object as well as protect itself or an object in its immediate proximity characterized in that a single antenna is provided for external protection and for self-protection which, in a first horizontal azimuth plane produces a sharply focused radiation pattern, and, in a second vertical elevation plane, which is perpendicular to the first plane, produces a radiation pattern which, although not optimized to external or foreign protection, or self-protection, respectively, has a mean radiation pattern which is common for both types of protection, and a tilt control for said antenna to tilt it in said second vertical plane to a first position such that its direction of primary radiation corresponds to a direction which is optimum for external protection, and, in the other position corresponds to a direction which is optimum for self-protection, means for rotating said antenna about a vertical axis and tilting it and switch means for switching between external protection and self-protection and controlled commonly with said antenna tilt control.
Specification