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Title: US4547728: RF Wattmeter
[ Derwent Title ]

Country: US United States of America

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12 pages

Inventor: Mecklenburg, Frank H.; Chagrin Falls, OH

Assignee: Bird Electronic Corporation, Solon, OH
other patents from BIRD ELECTRONIC CORPORATION (66570) (approx. 18)
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Published / Filed: 1985-10-15 / 1982-08-31

Application Number: US1982000413537

IPC Code: Advanced: G01R 21/00; G01R 21/01; G01R 21/12; H04B 1/02; H04B 17/00;
Core: more...
IPC-7: G01R 21/04;

U.S. Class: Current: 324/095; 324/099.R; 324/119;
Original: 324/095; 324/099.R; 324/119;

Field of Search: 324/58 B,58 A,58 R,95,99 R,99 D,119,132

Priority Number:
1982-08-31  US1982000413537

Abstract: An RF wattmeter is disclosed of the type using an "insertion-type" pick-up element to produce a voltage wave signal corresponding to the measured power in the coaxial transmission line. The induction loop in the pick-up element is connected to a principal detector, and a secondary detector is connected in opposition to the principal detector. Both detectors are located in close proximity to each other and are subject to the same thermal environment. A sine wave generator supplies a wave signal to the secondary detector in opposition to the wave signal supplied to the principal detector from the inductive loop. The d.c. portion of the resulting signal representing the difference between the opposed signals is integrated, and the integrated output is used as the amplitude in the generated sine wave. When the circuit is in balance, the integrated output matches the amplitude of the inductive wave form and can be used as an output indicating measured power in the coaxial transmission line.

Attorney, Agent or Firm: Pearne, Gordon, Sessions, McCoy, Granger & Tilberry ;

Primary / Asst. Examiners: Levy, Stewart J.; Baker, S.

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Designated Country: DE FR GB IT 

Family: Show 11 known family members

First Claim:
Show all 20 claims
What is claimed is:     1. An electronic instrument for measuring RF power levels on a coaxial transmission line comprising:
    means for sensing the RF voltage levels on the transmission line and producing a first voltage wave signal proportional thereto;
  • first detector means for translating the first voltage wave signal from the sensing means into a sensed voltage wave signal corresponding to power in the transmission line;
  • means for generating a second voltage wave signal;
  • second detector means connected in opposition to the first detector means for translating the second voltage wave signal and supplying it in opposition to the sensed voltage wave signal to produce a difference signal;
  • means connecting the generating means and the second detector means, the connecting means comprising a line carrying a single composite signal, the second voltage wave signal and the difference signal forming parts of the single composite signal; and
  • means connected to the connecting means for integrating the difference signal to produce an output signal.

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Forward References: Show 4 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (4)   |   Backward references (3)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 4pp US3142799* 1964-07 Kovalevski    
Get PDF - 7pp US4080566  1978-03 Mecklenburg  Bird Electronic Corporation RF directional wattmeter
Get PDF - 11pp US4359682  1982-11 Winslow  Hewlett-Packard Company Method and apparatus for testing the output reflection coefficient of an automatic level controlled source
  * some details unavailable
Foreign References: None

Other References:
  • News From Rhode & Schwarz 60, Burkhart, D., "Directional Power Meter NAUS", vol. 13, 1973, pp. 13-15.

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