GB694634A - Improvements in or relating to wide-band two-phase networks - Google Patents
Improvements in or relating to wide-band two-phase networksInfo
- Publication number
- GB694634A GB694634A GB2123949A GB2123949A GB694634A GB 694634 A GB694634 A GB 694634A GB 2123949 A GB2123949 A GB 2123949A GB 2123949 A GB2123949 A GB 2123949A GB 694634 A GB694634 A GB 694634A
- Authority
- GB
- United Kingdom
- Prior art keywords
- networks
- network
- degree
- frequency
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
- H03H7/21—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
694,634. Impedance networks. POSTMASTER GENERAL. Aug. 29, 1951 [Aug. 15, 1949], No. 21239/49. Class 40 (viii). A wide band twophase network comprises a pair of transmission networks of all pass type, having equal and constant attenuations independent of frequency, and with a difference between their phase shifts which oscillates with frequency between (#/2 -#m) and, (#/2+#m) radians over the frequency range, wherein tan(#m/2)=2q<SP>n</SP>, where q=exp(- #k<SP>1</SP>/k), k and k<SP>1</SP> are the quarter periods of an elliptical function with modulus k, and n is the degree of the network, the poles of less being determined from the equation where # assumes all integral values from 1 to (n - 1), the values of the inductive components L of the networks being derived from the equation L=Ro/poWo, and those of the capacities C from the equation Ro being the characteristic impedance of the network and Wo being the geometric mean of the frequency limits of the band of the network. The networks used in the invention are lattice networks, Fig. 2a, showing one of the first degree, and Fig. 2b one of the second. Despite their simplicity the first degree networks have a disadvantage as several joined in tandem must be used and the resonances due to self capacity of the coils in the low frequency sections lie inside the pass band. By combining the highest frequency section with the lowest to form a second degree network, and the next highest with the next lowest, and so on, it is possible to avoid this trouble. A practical example is shown in Fig. 11 where a second degree lattice forms each network. They are connected to common input terminals shown on the left of the Figure and they are terminated in their impedances Ro at the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2123949A GB694634A (en) | 1949-08-15 | 1949-08-15 | Improvements in or relating to wide-band two-phase networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2123949A GB694634A (en) | 1949-08-15 | 1949-08-15 | Improvements in or relating to wide-band two-phase networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB694634A true GB694634A (en) | 1953-07-22 |
Family
ID=10159549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2123949A Expired GB694634A (en) | 1949-08-15 | 1949-08-15 | Improvements in or relating to wide-band two-phase networks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB694634A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1232286B (en) * | 1954-11-17 | 1967-01-12 | Standard Elektrik Lorenz Ag | Method for correcting the attenuation curve in the passband of high-pass filters and bandstop filters implemented as bridge filters |
| CN117313293A (en) * | 2023-11-30 | 2023-12-29 | 山东大学 | Small signal equivalent modeling method, system, terminal and medium for direct-drive wind farm |
-
1949
- 1949-08-15 GB GB2123949A patent/GB694634A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1232286B (en) * | 1954-11-17 | 1967-01-12 | Standard Elektrik Lorenz Ag | Method for correcting the attenuation curve in the passband of high-pass filters and bandstop filters implemented as bridge filters |
| CN117313293A (en) * | 2023-11-30 | 2023-12-29 | 山东大学 | Small signal equivalent modeling method, system, terminal and medium for direct-drive wind farm |
| CN117313293B (en) * | 2023-11-30 | 2024-02-27 | 山东大学 | Small signal equivalent modeling method, system, terminal and medium for direct-drive wind farm |
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