Multiband, phased-array antenna with interleaved tapered-element and waveguide radiators
First Claim
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1. A multiband, phased array antenna, comprising:
- a first subarray of tapered-element radiators, each of said tapered-element radiators having a pair of tapered wings which are dimensioned to radiate energy in a lower microwave frequency band and in a middle microwave frequency band;
a second subarray of waveguide radiators, each of said waveguide radiators having a launch end and dimensioned to radiate energy from said launch end in an upper microwave frequency band;
said first subarray and said second subarray arranged in an interleaved relationship with the tapered wings of said tapered-element radiators extending past the launch ends of said waveguide radiators by a distance which establishes a predetermined tapered wing radiation impedance;
a first microwave feed network configured to receive microwave signals in said lower microwave frequency band and in said middle microwave frequency band and to distribute them to said tapered-element radiators;
a plurality of lower microwave frequency band phase shifters positioned in said first microwave feed network to selectively phase shift said microwave signals in said lower microwave frequency band;
a plurality of middle microwave frequency band phase shifters positioned in said first microwave feed network to selectively phase shift said microwave signals in said middle microwave frequency band;
a plurality of diplexers positioned in said first microwave feed network to couple said lower microwave frequency band phase shifters and said middle microwave frequency band phase shifters with said tapered-element radiators;
a second microwave feed network configured to receive microwave signals in said upper microwave frequency band and to distribute them to said waveguide radiators; and
a plurality of upper microwave frequency band phase shifters positioned in said second microwave feed network to selectively phase shift said microwave signals in said upper microwave frequency band.
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Abstract
A multiband phased-array antenna interleaves tapered-element radiators with waveguide radiator to facilitate the simultaneous radiation of antenna beams across a bandwidth in excess of two octaves. The launch ends of the waveguide radiators collectively define a ground plane. The tapered-element radiators have pairs of tapered wings which are extended past the ground plane by a distance which is selected to establish a predetermined tapered wing radiation impedance. The radiators of each type are spaced apart by a span which insures that they will not generate grating lobes at the highest frequency which they respectively radiate.
147 Citations
12 Claims
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1. A multiband, phased array antenna, comprising:
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a first subarray of tapered-element radiators, each of said tapered-element radiators having a pair of tapered wings which are dimensioned to radiate energy in a lower microwave frequency band and in a middle microwave frequency band; a second subarray of waveguide radiators, each of said waveguide radiators having a launch end and dimensioned to radiate energy from said launch end in an upper microwave frequency band; said first subarray and said second subarray arranged in an interleaved relationship with the tapered wings of said tapered-element radiators extending past the launch ends of said waveguide radiators by a distance which establishes a predetermined tapered wing radiation impedance; a first microwave feed network configured to receive microwave signals in said lower microwave frequency band and in said middle microwave frequency band and to distribute them to said tapered-element radiators; a plurality of lower microwave frequency band phase shifters positioned in said first microwave feed network to selectively phase shift said microwave signals in said lower microwave frequency band; a plurality of middle microwave frequency band phase shifters positioned in said first microwave feed network to selectively phase shift said microwave signals in said middle microwave frequency band; a plurality of diplexers positioned in said first microwave feed network to couple said lower microwave frequency band phase shifters and said middle microwave frequency band phase shifters with said tapered-element radiators; a second microwave feed network configured to receive microwave signals in said upper microwave frequency band and to distribute them to said waveguide radiators; and a plurality of upper microwave frequency band phase shifters positioned in said second microwave feed network to selectively phase shift said microwave signals in said upper microwave frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneeRaytheon Company (Rtx Corporation)
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Original AssigneeHughes Aircraft Company (Rtx Corporation)
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InventorsChu, Ruey-shi, Lee, Kuan M., Wang, Allen T. S.
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Primary Examiner(s)LE, HOANGANH T
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Application NumberUS08/451,084Time in Patent Office481 DaysField of Search343/770, 343/771, 343/727, 343/725, 343/729, 343/767, 343/772, 343/776, 343/700 MS, 343/777, 343/778, 343/785, 343/768, 343/795US Class Current343/725CPC Class CodesH01Q 13/085 Slot-line radiating endsH01Q 5/42 using two or more imbricate...
