RF & Microwave Power Sensor Patents

Brooke Clarke, N6GCE 2003 - 2016


These are some patents related to measuring the power level of RF and Microwave signals.

7830134 Power meter with means to eliminate the need to zero and calibrating, Richard R. Hawkins, Jon R. Sigler, Ladybug Technologies Llc, Nov 9, 2010 - all about temperature stability and measurement
7884596 Self-balancing frequency determining bridge, Richard R. Hawkins, Jon R. Sigler, Feb 8, 2011 - pwr meter measures frequency

6548999 RMS power sensor with 84 dB dynamic range April 15, 2003 324/132; 324/95; 324/115; 324/119 Anritsu Company (Morgan Hill, CA)

6407540 Switched attenuator diode microwave power sensor June 18, 2002 324/95; 250/250; 324/76.14; 324/119; 343/703 Agilent Technologies, Inc. (Palo Alto, CA)

6331769 RMS power sensor with 84 dB dynamic range December 18, 2001 324/132; 324/95; 324/115; 324/119 Anritsu Company (Morgan Hill, CA)

6291984 Dual mode diode power sensor with square law and linear operating regions September 18, 2001 324/132; 324/95; 324/115; 324/119 Anritsu Company (Morgan Hill, CA)

6291982 True average wide dynamic range power sensor September 18, 2001 324/95 Agilent Technologies, Inc. (Palo Alto, CA)

6242901 True average wide dynamic range microwave power sensor using diode stack attenuator-diode stack June 5, 2001 324/95; 324/76.14; 324/115 Agilent Technologies Inc. (Palo Alto, CA)

5302024 Monolithic microwave power sensor using a heat sensing diode junction April 12, 1994 374/122; 324/95; 324/106; 374/178 Lockheed Sanders, Inc. (Nashua, NH)

5204614 Broad-band microwave power sensor using diodes above their resonant frequency April 20, 1993 324/95; 324/652; 333/113; 333/250 Hewlett-Packard Company (Palo Alto, CA)  - Waveguide

5204613 RF power sensor having improved linearity over greater dynamic range April 20, 1993 324/95; 324/119 Wavetek Microwave, Inc. (Sunnyvale, CA)

4943764 Wide dynamic range radio-frequency power sensor July 24, 1990 324/95; 324/114; 324/115; 324/132 Hewlett-Packard Company (Palo Alto, CA)

4873484   Extended range composite head power sensor with three circuit branches having a common node October 10, 1989 324/95; 324/115 Lucas Weinschel, Inc. (Gaithersburg, MD)

4789823 Power sensor for RF power measurements December 6, 1988 324/95; 257/470; 324/106 Rohde & Schwarz GmbH & Co. KG (DE)

4628256 Thermocouple power meter December 9, 1986 324/95; 324/106; 324/118; 330/10 Weinschel Engineering Co., Inc. (Gaithersburg, MD)

4360865 Broad band microwave detector November 23, 1982 363/126; 324/95; 329/322; 333/247 Pacific Measurements, Inc. (Sunnyvale, CA)

4104583 Six-port measuring circuit August 1, 1978 324/638; 324/95; 324/650 (U.S.A.)
I learned about the 6-port during a visit to NBS (now NIST) around 1970 +/- 10 years.  This circuit uses 6 scalar power detectors to make vector measurements of microwave components.  This is very different from a vector network analyzer that processes the microwave signals as vectors.

3947706 Voltage and temperature compensated linear rectifier March 30, 1976 327/538; 324/119; 327/513 U.S. (Sec of Navy)

3739269 Precision Self-Contained D.C. Substitution Bridge for R.F. Measurements June 12, 1973 324/106; 324/95 (Weinschel Engineering)

3694746 Thin Film Thermoelectric Calorimeter for Measuring Large Values of Microwave Power Sept. 26, 1972 324/95; 324/106 (General Microwave)

3678395 Broadband Planar balanced Circuit July 18, 1972 455/327; 332/164; 333/238; 455/330  (GTE Sylvania)

3611130 Power Measuring and Leveling System using a self Balancing Bridge Oct. 5, 1971 324/106; 324/95; 324/98 (U.S. Sec. of commerce)

3212015 Broadband Crystal Diode Decetor Oct. 12, 1965 327/583; 257/727; 327/1; 333/245; 439/578; 439/620; 439/641 (Fred Kruse to Alfred Electronics)

3270282  Precision Direct Current Substitution Bridge for Measuring R.F. Values Aug. 30, 1966 324/106; 324/95; 324/98 (Weinschel Engineering)

3142017 Precision Direct Current Substitution Bridge for Measuring R.F. Values July 21, 1964 324/106; 324/95; 324/98 (Weinschel Engineering)

3081430 Microwave Power Meter of the Calorimeter Type Mar. 12, 1963 324/95; 324/106 (PRD Electronics)

2799826 Wattmeter Self Balancing Bridge Apaaratus July 16, 1957 324/95; 324/132 (Sperry Rand)

2577543 Power Measuring System Dec. 4, 1951 324/98; 324/95; 324/106 (U.S. Sec. of War) - thermistor bridge power meter

2565922 High Frequency Thermistor Wattmeter Aug. 28, 19651 324/106; 324/95; 324/123R; 324/706; 330/143 (Sec of Navy)

2417820 Power Measuring Bridge March 25, 1947  324/95; 188/153R; 324/98; 324/106; 324/601; 324/616 (Sperry Gyroscope)

2415823 Electrical Equipment Feb. 18, 1947 324/101; 324/106 (Bell Telephone Labs) - Wheatstone bridge with thermistor for comparing AC power to dc power

2399481 Ultra High Frequency System April 30, 1946 324/95; 324/98; 324/106; 331/44; 331/64; 331/67; 331/99; 333/33; 333/81R  (RCA) - bolometer employing Wollaston wire

2398606 UHF Power Measurement April 16, 1946 324/92; 136/224; 159/DIG26; 219/687; 324/95; 324/98; 324/106; 333/22F; 333/22R; 374/113; 374/179 (Westinghouse)

2366618 Measuring and Control Aparatus Jan. 2 1945  236/74R; 60/39.282; 236/69; 318/676; 324/99R; 324/118; 327/50; 327/100; 330/9; 330/10; 330/114; 330/173; 374/168 (Brown Instrument Co.) - self balancng thermocoouple

2278687 Radio Frequency Wattmeter April 7, 1942 324/106; 324/126; 363/13 (RCA) - in line wattmeter for R.F.

2278686 Radio Frequency Wattmeter April 7, 1942 324/95; 324/142; 363/13 (RCA) -

2140364 Radio Frequency Wattmeter Dec. 13, 1938 324/106; 363/13 (Westinghouse) - uses 3 or 5 thermocouples

2005986 Impedance Set June 25, 1935 338/128; 338/202 (Leeds & Northrup) - Decade box that does not "jump" when switching settings

1957454 Power Output Indicator for High Frequency Aparatus May 8, 1934 324/106; 136/224; 324/77.11; 324/157 (L. Gebhard) - thermocouples located in cooling fluid

1791563 Electrical Semipotentiometer Feb 10, 1931 324/723; 324/157; 374/179 (Wilson-Maeulen Co.) - thermocouple temperature measurement

1590420 Comparator June 29, 1926 324/98; 324/72; 324/140R (Westinghouse) - bridge compars ac and dc currents

1472125 Measuring Aparatus Oct. 30, 1923 324/443; 99/DIG11; 324/442; 340/870.43 (Leeds & Northrup) - Weatstone bridge used to measure the resistance of boiler water to determine of there's too much salt and the boiler needs to be blown down.

1407147 Thermal Ammeter 21 Feb. 1922 324/106; 136/222; 363/13 (Weston Electrical Inst. Co.) - hot wire method

1379266 Compensation Method and Aparatus May 24, 1921 324/721; 324/443; 324/706; 374/174 (Leeds & Northrup) - temperature compensated Wheatstone bridge for measuring electrolytes

1039925 Alternating Current Measuring Aparatus Oct. 1, 1912 324/101; 324/106 (B. Gati) - barretter with nulling current applied to measure AC

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