GB539194A - Improvements in electric circuits for coupling unequal impedances - Google Patents
Improvements in electric circuits for coupling unequal impedancesInfo
- Publication number
- GB539194A GB539194A GB3712/40A GB371240A GB539194A GB 539194 A GB539194 A GB 539194A GB 3712/40 A GB3712/40 A GB 3712/40A GB 371240 A GB371240 A GB 371240A GB 539194 A GB539194 A GB 539194A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- frequency
- impedances
- lengths
- band
- 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
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
Abstract
539,194. Impedance networks. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 28, 1940, No. 3712. Convention date, Feb. 28, 1939. [Class 40 (iii)] A transducer for coupling an output device O to an input device I of different impedance comprises two lengths of transmission line in tandem, each of a quarter the wave length corresponding to a mid-frequency f0 of the band to be transmitted, and their characteristic impedances Z 0 , Z 1 being such that the impedance Zm at the junction point is equal to the geometric mean of the terminal impedances R 0 , R 1 . The curves R, X represent the resistance and reactance components of the impedance as seen from the input device I, and it is shown mathematically that when the condition just stated holds, the slope of the reactance curve X is zero at the critical frequency f0, so that the impedance is substantially constant over a band of which that is the mid-frequency. It follows that the characteristic impedances are related to the terminal impedances by the equations Zo<SP>4</SP>= Ro<SP>3</SP>R 1 and Z 1 4=RoR 1 <SP>3</SP>. The frequency band may be widened further by using four lengths of line, in which case the characteristic impedances form a geometrical progression. According to the Specification as published under Sect. 91, equivalent ladder networks may be substituted for the lengths of transmission line.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US259069A US2249597A (en) | 1939-02-28 | 1939-02-28 | Coupling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB539194A true GB539194A (en) | 1941-09-01 |
Family
ID=22983383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3712/40A Expired GB539194A (en) | 1939-02-28 | 1940-02-28 | Improvements in electric circuits for coupling unequal impedances |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2249597A (en) |
| GB (1) | GB539194A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2490957A (en) * | 1945-06-30 | 1949-12-13 | Rca Corp | Antenna system |
| US2633531A (en) * | 1946-03-29 | 1953-03-31 | Jessie A Nelson | Broad band antenna system |
| US2938209A (en) * | 1956-12-10 | 1960-05-24 | Brueckmann Helmut | Antenna curtain array with coupling network |
| US2979677A (en) * | 1957-03-14 | 1961-04-11 | Jean H Clark | Quarter wave limiter circuit |
| US4813047A (en) * | 1987-10-05 | 1989-03-14 | General Electric Company | High frequency signal driver for a laser diode and method of forming same |
-
1939
- 1939-02-28 US US259069A patent/US2249597A/en not_active Expired - Lifetime
-
1940
- 1940-02-28 GB GB3712/40A patent/GB539194A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2249597A (en) | 1941-07-15 |
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