GB850036A - Improvements in or relating to travelling wave amplifiers - Google Patents
Improvements in or relating to travelling wave amplifiersInfo
- Publication number
- GB850036A GB850036A GB17710/58A GB1771058A GB850036A GB 850036 A GB850036 A GB 850036A GB 17710/58 A GB17710/58 A GB 17710/58A GB 1771058 A GB1771058 A GB 1771058A GB 850036 A GB850036 A GB 850036A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pumping
- wave
- frequency
- channels
- idler
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F7/00—Parametric amplifiers
- H03F7/02—Parametric amplifiers using variable-inductance element; using variable-permeability element
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F7/00—Parametric amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Microwave Amplifiers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
850,036. Parametric amplifiers. WESTERN ELECTRIC CO. Inc. June 3, 1958 [June 6, 1957], No. 17710/58. Class 40 (9). A travelling-wave parametric amplifier comprises separate channels for a signal wave of frequency #1 and an idler wave of frequency f2. The two channels are coupled by a variable parameter such as reactance controlled by a pumping wave of frequency fp in a third channel where fp = f1 + f2. There is no need for any harmonic relation between #1, #2 and #p but if fp = 2#1 a single channel may carry both signal and idler frequencies. The channels and the couplings may be built up of either lumped or distributed impedances. For optimum results, it is desirable that the phase constants of the waves should satisfy the relations where P 1 # 2 , # p are phase constants and w is angular velocity. The terms " impedance " and " reactance " are used in the broad sense described by Schelkunoff. Low frequencies 60 c/s. to 10<SP>6</SP> c/s., lumped impedances.-Signal, idler and pumping channels 1, 2, 3, Fig. 1, comprise iterative networks of impedances L1, L2, L3 and C1, C2, C3. Channels 1 and 2 are linked by saturable inductors 8 controlled by the pumping wave in channel 3 which in effect produces a reactance wave in the line of inductors. The channels 1 and 2 are terminated with their characteristic impedances 6 and 7 to avoid reflections. An amplified version of the signal frequency f1 may be derived from the terminal load 6 at frequency f1 or from the terminal load 7 at frequency f2. The output of the pumping channel is fed back to the input through buffer amplifiers 13, 11. A third buffer amplifier 10 is included in the pumping input circuit. Alternatively, the line may be terminated so as to reflect the pumping wave and thereby to form standing waves. In Fig. 2 (not shown) the variable inductors of Fig. 1 are replaced by variable capacitors or reactance valves. High frequencies, distributed impedance.-In an amplifier, Figs. 3, 4, using a pumping frequency of about 9 X 10<SP>9</SP> c/s., the pumping channel is a circular waveguide 23. The signal and idler frequencies #1, #2 are guided on pairs of conductors 21a, 21b and 22a, 22b. The channels are coupled by a filling 25 of manganese ferrite, of yttrium iron garnet or of a rare earth iron garnet. The guides are placed between the poles N, S of an electromagnet which is adjusted so that a gyromagnetic resonance frequency of the filling material 25 falls in the region of the pumping frequency. The arrangement satisfies the three necessary conditions for amplification set out in Specification 839,596. From Fig. 4 it can be seen that (1) the magnetic vector of one (fl) of the two lower frequency waves has a component parallel to the magnetic field H, (2) the magnetic vector of the other (2f) of the two lower frequency waves has a component perpendicular to H. To satisfy the third condition (3) the magnetic vector loops of the pumping wave (not shown) are in planes parallel to the plane of conductors 22a, 22b and have components perpendicular to H. As shown, the three channels for the signal idler and pumping waves are terminated by their characteristic impedances 6, 7, 24. The ends of the circular waveguide may be closed by conductive sheets 26, Fig. 5, so as to form a standing pumping wave. The terminating impedance 7 of the idler line is embedded in the material 25 and the pumping wave may be introduced at any electric node by means of a coaxial line 27 and a probe terminating the inner conductor. In another arrangement, Fig. 6, the signal and idler waves travel along a rectangular waveguide 31 in different nodes, the magnetic vector loops of one wave lying parallel to the horizontal face of the guide, as shown, and the loops of the other wave parallel to the vertical face. The pumping wave is fed to a second rectangular guide 32. The guides are coupled by a ferrite rod 33 filling a longitudinal slot in the common walls of the two guides. Specification 652,155 is referred to.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66400657A | 1957-06-06 | 1957-06-06 | |
US850707XA | 1957-10-30 | 1957-10-30 | |
US893082XA | 1958-03-26 | 1958-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB850036A true GB850036A (en) | 1960-09-28 |
Family
ID=31982224
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17710/58A Expired GB850036A (en) | 1957-06-06 | 1958-06-03 | Improvements in or relating to travelling wave amplifiers |
GB31802/58A Expired GB850707A (en) | 1957-06-06 | 1958-10-06 | Improvements in or relating to travelling wave amplifiers |
GB9701/59A Expired GB893082A (en) | 1957-06-06 | 1959-03-20 | Improvements in or relating to travelling wave amplifiers |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31802/58A Expired GB850707A (en) | 1957-06-06 | 1958-10-06 | Improvements in or relating to travelling wave amplifiers |
GB9701/59A Expired GB893082A (en) | 1957-06-06 | 1959-03-20 | Improvements in or relating to travelling wave amplifiers |
Country Status (6)
Country | Link |
---|---|
BE (2) | BE572020A (en) |
CH (1) | CH391799A (en) |
DE (2) | DE1094313B (en) |
FR (1) | FR1208249A (en) |
GB (3) | GB850036A (en) |
NL (3) | NL237429A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215941A (en) * | 1960-07-13 | 1965-11-02 | Hazeltine Research Inc | Traveling-wave parametric amplifier with idler frequency much higher than signal frequency and propagating on same line therewith |
DE1275160B (en) * | 1961-12-29 | 1968-08-14 | Siemens Ag | Device for parametric excitation or amplification of electromagnetic waves |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR890345A (en) * | 1941-12-01 | 1944-02-04 | Telefunken Gmbh | Improvements to amplifier systems with several electronic tubes |
US2698398A (en) * | 1949-04-07 | 1954-12-28 | Univ Leland Stanford Junior | Traveling wave electron discharge device |
-
0
- BE BE567285D patent/BE567285A/xx unknown
- BE BE572020D patent/BE572020A/xx unknown
- NL NL228439D patent/NL228439A/xx unknown
- NL NL232219D patent/NL232219A/xx unknown
- NL NL237429D patent/NL237429A/xx unknown
-
1958
- 1958-05-22 DE DEW23385A patent/DE1094313B/en active Pending
- 1958-05-30 FR FR1208249D patent/FR1208249A/en not_active Expired
- 1958-06-03 GB GB17710/58A patent/GB850036A/en not_active Expired
- 1958-06-05 CH CH6024958A patent/CH391799A/en unknown
- 1958-10-02 DE DEW24201A patent/DE1099007B/en active Pending
- 1958-10-06 GB GB31802/58A patent/GB850707A/en not_active Expired
-
1959
- 1959-03-20 GB GB9701/59A patent/GB893082A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB893082A (en) | 1962-04-04 |
NL237429A (en) | |
BE572020A (en) | |
NL232219A (en) | |
FR1208249A (en) | 1960-02-22 |
GB850707A (en) | 1960-10-05 |
DE1094313B (en) | 1960-12-08 |
CH391799A (en) | 1965-05-15 |
BE567285A (en) | |
DE1099007B (en) | 1961-02-09 |
NL228439A (en) |
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