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US 4,047,179 AGranted
IFF antenna arrangement
AssigneeRaytheon Company
InventorsAlfred J. Appelbaum, Michael J. Collins, Jerome D. Hanfling
Life of this patent
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Abstract
An improved IFF antenna arrangement is shown to comprise two linear arrays, each one of the arrays being made up of a plurality of similar cavity-backed radiating slots fed by a stripline feed. The impedance of each radiating slot is matched, at two different operating frequencies, to the impedance of a combination of the impedances of the corresponding cavity and stripline feed.
Claims7
An antenna arrangement adapted to transmit radio frequency energy at a first frequency, f.sub.1, and to receive radio frequency at a second frequency, f.sub.2, such arrangement comprising:
- (a) a stripline having a center conductor disposed between opposing ground planes and a radiating slot formed in one of such ground planes, the resonant frequency of such slot being equal to the average of the frequencies f.sub.1 and f.sub.2 ;
- and
- (b) electrically conductive means connecting the opposing ground planes to form a generally rectangular cavity into which the center conductor projects and the radiating slot opens, said slot being coupled to said cavity at an end opposite the electrically conductive means the resonant frequency of such cavity being equal to the average of the frequencies f.sub.1 and f.sub.2.
Dependencies are inferred from the claim text.