[특허]Variable microwave cold/warm noise source

[미국특허] Variable microwave cold/warm noise source 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01K-015/00 G01K-007/30
출원번호	US-0319520 (1999-08-23)
국제출원번호	PCT/US97/20969 (1997-11-28)
§371/§102 date	19990823 (19990823)
국제공개번호	WO-9827414 (1998-06-25)
발명자 / 주소	Roeder Robert S. Smith Matthew C. Dunleavy Lawrence P. Lardizabal Steven M.
출원인 / 주소	University of South Florida
대리인 / 주소	Baker Botts L.L.P.
인용정보	피인용 횟수 : 15 인용 특허 : 8

초록 ▼

A radiometer calibrating system utilizes an adjustable noise source for calibrating a radiometer. The noise source includes a transistor configured as a noise equivalent circuit having a gate port, drain port and source port. A source inductance providing series feedback for the noise source has one end coupled to the source port of the noise equivalent circuit and another end connected to the ground. A bias circuit controls the amount of DC bias applied to the noise equivalent circuit. In order to match the impedances in the noise source, an output impedance matching network in connected to the drain port and an input impedance matching network is connected to the gate port of the noise equivalent circuit. The output and input impedance networks have an output port and input port, respectively. Included in the noise source is a port switch that terminates a matched load to the output port when a cold thermal radiation temperature is generated at the input port, and alternatively, the port switch terminates the matched load to the input port when the warm thermal radiation temperature is generated at the output port.

대표청구항 ▼

[ We claim:] [1.]1. An adjustable noise source, for calibration of a radiometer, comprising:a noise equivalent circuit having a first port, a second port and a third port;a source inductance providing series feedback and having one terminal coupled to the third port of the noise equivalent circuit and another terminal connected to ground;an output impedance matching network terminated at the second port of the noise equivalent circuit, said output impedance matching network includes an output port;an input impedance matching network connected to the first port of the noise equivalent circuit, said input impedance matching network includes an input port;a bias circuit for applying a DC bias to the output impedance matching network and the input impedance matching network;a matched load having a first terminal connected to the ground; anda port switch having a first position for connecting a second terminal of the matched load to the input port and for connecting a calibration line to the output port, and a second position for connecting the second terminal of the matched load to the output port and for connecting the calibration line to the input port to generate a warm thermal radiation temperature output from the output port when the matched load terminates the input port and generate a cold thermal radiation temperature output from the input port when the matched load terminates the output port.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

Prager Kenneth E. (9037 Gibson St. Los Angeles CA 90034), Black body calibration using image processing techniques.
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Van De Velde Jean-Claude (Mons-En-Baroeul FRX) Constant Eugne (Villeneuve D\Ascq FRX), Method for measuring the temperature of a material by using microwave radiation.
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Chiv Maurice (Villeneuve d\Asco FRX) Sozanski Jean-Pierre (Lille Cedex FRX) Moschetto Yves (Lille Cedex FRX) VanLoot Daniel (Villeneuve d\Asco FRX), Method for the measurement of temperatures by microwave radiometry, with automatic calibration of the measurement, and d.
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Ogikubo Kazuhiro (Tokyo JPX), Radiometer with correction device.
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Chive Maurice (Villeneuve d\Ascq FRX) Sozanski Jean-Pierre (Thumeries FRX) Moschetto Yves (Haubourdin FRX) Vanloot Daniel (Calais FRX), System for internal heat treatment of a specific body and its use.
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Sterzer Fred, Temperature-measuring microwave radiometer apparatus.
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Sterzer Fred (Princeton NJ) Mawhinney Daniel D. (Livingston NJ), Temperature-measuring microwave radiometer apparatus.
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Day W. Baldwin (Dunedin FL) Strenglein Harry F. (Clearwater FL), Thin film resistor microwave noise generator.
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이 특허를 인용한 특허 (15) 인용/피인용 타임라인 분석

Huang, Chun-Yen; Nien, Chin-Chung; Chang, Li-Yuan; Li, Chen-Ming; Yu, Ya-Chung, Calibration devices and calibration methods.
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Roeder, Robert S.; O'Connor, Kenneth A.; Smith, Matthew C.; O'Brien, Shawn K., Cold noise source system.
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Suzuki, Yasunori; Narahashi, Shoichi, Cryogenic receiving amplifier and amplifying method.
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Gritz, Michael Aidan; Lardizabal, Steven Marc; Wang, Zhaoyang Charles, Loss-less frequency dependent dicke-switched radiometer.
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Sezai, Toshihiro, Method for calibrating a total-power microwave radiometer for a satellite.
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Shylo, Sergiy; Sydorenko, Yuriy, Method for formation of radiometric images and an antenna for implementation of the method.
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Shylo, Sergiy; Sydorenko, Yuriy, Method for formation of radiometric images and an antenna for implementation of the method.
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Shylo, Sergiy; Sydorenko, Yuriy, Method for formation of radiometric images and an antenna for implementation of the method.
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Shylo, Sergiy; Sydorenko, Yuriy; Wheeler, Dana; Dundonald, Douglas, Millimeter and sub-millimeter wave radar-radiometric imaging.
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Shylo, Sergiy; Sydorenko, Yuriy; Wheeler, Dana; Dundonald, Douglas, Millimeter and sub-millimeter wave radar-radiometric imaging.
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Yip, Jim; Rice, Paul; Black, Mark, Package for high frequency circuits.
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Floyd, Brian Allan; Greenberg, David Ross; Malladi, Ramana Murty; Orner, Bradley Alan; Reynolds, Scott Kevin, Radio frequency integrated circuit with on-chip noise source for self-test.
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Roeder, Robert S., Radiometer with programmable noise source calibration.
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Tsai, Roger S., Semi-physical modeling of HEMT high frequency small signal equivalent circuit models.
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Roeder, Robert S.; Weller, Thomas M.; Herzig, Paul A., Subsurface temperature measurement system.
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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] Variable microwave cold/warm noise source 원문보기