[특허]Scan compensation for array antenna on a curved surface

[미국특허] Scan compensation for array antenna on a curved surface 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01Q-003/22
출원번호	US-0904295 (1992-06-24)
발명자 / 주소	Schuss Jack J. (Sharon MA) Hanfling Jerome D. (Framingham MA) Upton Jeffrey C. (Groton MA) O\Shea Richard L. (Holliston MA) Chang Kaichiang (Northborough MA)
출원인 / 주소	Raytheon Company (Lexington MA 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

A low array antenna having transmit/receive (T/R) modules, which contain a digitally-controlled variable attenuator, for each of the two polarizations (horizontal and vertical). The array has a cylindrically curved surface which closely conforms to the shape of the fuselage of an airborne vehicle or another structure. Each polarization feeds into an elevation beamformer apparatus which provides both a uniform taper and a Bayliss/Taylor taper. As the beam is scanned in elevation, the amplitude taper is adjusted via the variable attenuator to control the taper of a sum pattern and thereby achieve low sidelobe far field sum patterns. The same attenuators that are used for the sum pattern also feed a difference network. The T/R module attenuators are set to yield the desired low sidelobe sum illumination for a desired elevation scan angle. As the array is steered in elevation, the Bayliss difference taper is distorted since the fixed elevation beamformer cannot adjust the difference pattern for the new scan angle. A T/R module is provided at each column of the array to combine the distorted Bayliss difference pattern with the compensated Taylor sum pattern output. This combining permits the distorted Bayliss array illumination to be resymmetrized thereby producing a high quality, low sidelobe, compensated Bayliss far field pattern. This apparatus provides for complete compensation of both sum and difference patterns with only a single attenuator at each element of the array and a simple monopulse feed network.

대표청구항 ▼

An apparatus for use in a phased array radar system, and apparatus comprising: an antenna including N radiating elements disposed on a curved surface; means for steering a beam of said antenna to an angle comprising only one phase shifter means and one attenuator means coupled to each of said radiating elements for each polarization excited or received by said antenna; elevation beamformer means coupled to said steering means for shaping and producing two illuminations at said radiating elements according to a sum taper and a difference taper; means coupled to said elevation beamformer means for collecting sum outputs of said elevation beamformer means to form a sum beam collimated in azimuth and elevation; means coupled to said elevation beamformer means for maintaining said difference taper as said beam is steered to said angle, said difference taper maintaining means comprises a conformal compensation network; and azimuth beamformer means coupled to is conformal compensation network for collecting difference outputs from said conformal compensation network to form a difference beam collimated in azimuth and elevation.

이 특허를 인용한 특허 (41) 인용/피인용 타임라인 분석

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Scan compensation for array antenna on a curved surface 원문보기