GB488254A - Improvements in or relating to electrical wave filters - Google Patents
Improvements in or relating to electrical wave filtersInfo
- Publication number
- GB488254A GB488254A GB35295/36A GB3529536A GB488254A GB 488254 A GB488254 A GB 488254A GB 35295/36 A GB35295/36 A GB 35295/36A GB 3529536 A GB3529536 A GB 3529536A GB 488254 A GB488254 A GB 488254A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuned
- circuits
- circuit
- sound
- carrier
- 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
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
488,254. Impedance networks. CORK, E. C., and PAWSEY, J. L. Dec. 23, 1936, No. 35295. [Class 40 (iii)] Two circuits tuned to the same frequency are connected by a transmission line, an odd number of quarter-wavelengths long at the frequency to which the circuits are tuned, so that one circuit presents an impedance inverse to the other, and a constant input impedance is obtained. The networks are used in band stop or separator filters, and frequencies in the pass ranges are transferred with equal time delay. In Fig. 1, the circuits 1, 2 are tuned to the sound-carrier of a television system and are spaced a quarter of the sound-carrier wavelength apart ; the filter suppresses the sound carrier ; the equivalent circuit comprises a shunt connected series tuned circuit and a series connected parallel tuned circuit, Fig. 2 (not shown). The shunt connected series tuned circuits of Fig. 1, may be replaced by series connected parallel tuned circuits, Fig. 3 (not shown), and the quarter-wavelength line may be tapped onto the parallel tuned circuits, Fig. 6 (not shown). The network of Fig. 1 may have series connected parallel tuned circuits associated with each of the circuits 1, 2, Fig. 4 (not shown). An inverse network for accepting the sound-carrier comprises shunt connected parallel tuned circuits 4, 5, Fig. 5, associated with series connected series tuned circuits 1, 2 separated by a quarterwavelength line. As applied to a separator, one of the tuned circuits of Fig. 1, is connected in shunt, Fig. 7, so that circuit 1 accepts the sound-carrier while circuit 2 and the quarter wavelength line accepts the vision-carrier ; the equivalent circuit comprises a series tuned circuit in parallel with a parallel tuned circuit, Fig. 8 (not shown). The circuits 1, 2 of Fig. 7 may be replaced by inversely connected parallel tuned circuits, Fig. 9 (not shown) ; the circuit 1, Fig. 7, may be replaced by a shunt connected parallel tuned circuit in conjunction with a quarter-wavelength line, Fig. 10 (not shown). When the network is used to suppress the sound carrier, by coupling the sound-receiver to the first tuned circuit, the sound-carrier may be obtained, Fig. 11 (not shown). The tuned circuits may be replaced by long lines Figs. 15, 16 (not shown). U.S.A. Specification 1,933,669 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB35295/36A GB488254A (en) | 1936-12-23 | 1936-12-23 | Improvements in or relating to electrical wave filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB35295/36A GB488254A (en) | 1936-12-23 | 1936-12-23 | Improvements in or relating to electrical wave filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB488254A true GB488254A (en) | 1938-06-23 |
Family
ID=10376095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB35295/36A Expired GB488254A (en) | 1936-12-23 | 1936-12-23 | Improvements in or relating to electrical wave filters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB488254A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2490622A (en) * | 1941-01-15 | 1949-12-06 | Emi Ltd | High-frequency transmission line or cable and connector therefor |
-
1936
- 1936-12-23 GB GB35295/36A patent/GB488254A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2490622A (en) * | 1941-01-15 | 1949-12-06 | Emi Ltd | High-frequency transmission line or cable and connector therefor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2270416A (en) | Electrical wave system | |
GB579414A (en) | Improvements in or relating to electric wave filters | |
GB515739A (en) | Improvements in electrical frequency selective apparatus | |
US20170222293A1 (en) | Microstrip multiplexer | |
US2768351A (en) | Multipole network | |
GB517052A (en) | High frequency transmission networks | |
GB488254A (en) | Improvements in or relating to electrical wave filters | |
GB502499A (en) | Improvements in or relating to electrical coupling circuits | |
GB533171A (en) | Wave filter | |
GB835575A (en) | An improved multiplexing and filtering device for the u.h.f. band | |
GB476799A (en) | Improvements in or relating to electric signal transmission systems | |
GB502722A (en) | Improvements in or relating to electrical wave filters | |
GB534176A (en) | Modifying networks for the transmission of high frequency currents | |
US1690153A (en) | Selective echo suppressor | |
GB384747A (en) | Improvements in or relating to electric telecommunication systems | |
US1752461A (en) | Transmission network | |
US2081861A (en) | Band-pass filter | |
GB524550A (en) | Wide band amplifier sytems for electrical carrier-wave signals | |
GB397571A (en) | Improvements in electrical wave filters | |
GB390565A (en) | System of electrical picture transmission | |
GB516252A (en) | Improvements in television and like receivers | |
US2248754A (en) | Band-filter device | |
GB365053A (en) | Improvements in or relating to wave filters | |
GB817962A (en) | Electrical filter networks | |
GB485618A (en) | Improvements in or relating to electric wave filters |