GB644290A - Improvements in and relating to microwave power measuring instruments - Google Patents
Improvements in and relating to microwave power measuring instrumentsInfo
- Publication number
- GB644290A GB644290A GB18140/46A GB1814046A GB644290A GB 644290 A GB644290 A GB 644290A GB 18140/46 A GB18140/46 A GB 18140/46A GB 1814046 A GB1814046 A GB 1814046A GB 644290 A GB644290 A GB 644290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- bolometer
- conductor
- lines
- stub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
644,290. Power measurements. BRITISH THOMSON-HOUSTON CO., Ltd. June 17, 1946. No. 18140. Convention date, June 19, 1944. [Class 37] [Also in Group XL (b)] In a microwave-power-meter wherein the H.F. concentric transmission line for the electromagnetic wave to be measured is series connected with a bolometer resistance across which a voltage is developed proportional to the wave power, a stub-transmission line (or lines) connected across the main line effects reactance compensation at the mean operative frequency so that the impedance presented to the line by the bolometer and matching section is purely resistive, and a further tunable stubtransmission line connected across the main line between the stub-line and the bolometer resistance provides reactance compensation at other frequencies on the band of operation. As shown, the main transmission line 1 comprises concentric conductors 4, 5 and the bolometer 2 is mounted in a cartridge 7 resiliently held between fingers 6 terminating the conductor 4 and fingers 8 of a contact block 9 which is supported by insulation 11 within a conducting ring 10 secured to the end of conductor 5 to form a concentric capacitor short-circuiting the main transmission line for H.F. currents. Two identical stub-lines 12, 13 are connected across the main line 1. Each comprises an outer tubular conductor 17 seated in a block 18 supported by conductor 5, and an inner hollow conductor 14 screwed at 15 to the inner conductor 4. Tuning plugs threaded at 22 into the conductors 14 are adjusted to cancel out the input reactance of the transmission line 1 at the point of connection of lines 12, 13 at the mid-frequency of the operating band. Between the bolometer 2 and the stub-lines 12, 13 a tunable concentric transmission line 24 is connected across the main line 1. Tuning is effected by a capacitortype plunger 29 of length=“γ at the midband frequency, slidable along the inner conductor 25 in spaced relation with the outer conductor 27. The plunger 27 is carried by a piston 30 supported by an anchor block 32 and is adjusted through a rack 34 and pinion 35 by manually rotating a shaft 36. The length of line 24 is adjusted to a quarter wavelength of the operating frequency which may be indicated on a graduated disc 39 by a pointer 38 on the shaft 36. The length of the main line between the stub-lines 12, 13 and the line 24 is chosen so as to transform the conductance of bolometer 2 to the characteristic conductance of the line 1 at the point of connection of lines 12, 13 thereto, so assuring that the wave power is all absorbed in the bolometer 2. The voltage developed in the bolometer 2 and hence the power of the wave, is measured by a bridge 3 the meter 46 of which may be used to check the voltage of the battery 43 supplying the bridge by operating a push-button 49.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US644290XA | 1944-06-19 | 1944-06-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB644290A true GB644290A (en) | 1950-10-11 |
Family
ID=22055907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18140/46A Expired GB644290A (en) | 1944-06-19 | 1946-06-17 | Improvements in and relating to microwave power measuring instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB644290A (en) |
-
1946
- 1946-06-17 GB GB18140/46A patent/GB644290A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2423416A (en) | Nonfrequency-selective reflectometer | |
US2423506A (en) | Wavemeter for centimeter waves | |
US2468125A (en) | Standing wave indicator | |
US2719262A (en) | Electrical measuring apparatus | |
US2434610A (en) | Microwave power measuring instrument | |
GB644290A (en) | Improvements in and relating to microwave power measuring instruments | |
US2556607A (en) | Wave-signal translating arrangement | |
US3243704A (en) | Coaxial line reflectometer having a resistance connected between sections of the outer conductor | |
US2456679A (en) | High-frequency impedance bridge | |
US2526846A (en) | Impedance-transforming arrangement | |
US2762971A (en) | Impedance measuring system | |
US2456770A (en) | Impedance matching device | |
US2473495A (en) | Microwave wattmeter | |
US2335486A (en) | High frequency measuring circuit | |
GB633609A (en) | Improvements in or relating to devices for measuring ultra-high-frequency electric power | |
GB567639A (en) | Improvements in or relating to electrical apparatus for the measurement of electrical impedances at high frequencies | |
Dunn et al. | A wide-band balun | |
GB782450A (en) | Improvements relating to microwave power measuring systems | |
SU150890A1 (en) | Method of calibrating voltmeters in the microwave range | |
GB745424A (en) | Improvements in and relating to goniometers | |
GB583981A (en) | Improvements in and relating to electrical measuring instruments of the bridge type | |
GB584668A (en) | Improvements in or relating to apparatus for measuring voltages in high frequency electrical transmission lines | |
GB598198A (en) | Improvements in and relating to micro-wave wattmeters | |
Stewart | A Proposed Standard Dummy Antenna for Testing Aircraft-Radio Transmitters | |
GB624706A (en) | Electrical testing systems |