GB539444A - Improvements in electrical networks - Google Patents

Improvements in electrical networks

Info

Publication number
GB539444A
GB539444A GB436140A GB436140A GB539444A GB 539444 A GB539444 A GB 539444A GB 436140 A GB436140 A GB 436140A GB 436140 A GB436140 A GB 436140A GB 539444 A GB539444 A GB 539444A
Authority
GB
United Kingdom
Prior art keywords
resistance
shunt
sections
inductance
rsh
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
Application number
GB436140A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE476737D priority Critical patent/BE476737A/xx
Priority to FR956090D priority patent/FR956090A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB436140A priority patent/GB539444A/en
Priority to GB918740A priority patent/GB541380A/en
Publication of GB539444A publication Critical patent/GB539444A/en
Priority to ES0177213A priority patent/ES177213A1/en
Priority to FR57894D priority patent/FR57894E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0066—Constructional details of transient suppressor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/2039—Galvanic coupling between Input/Output
    • 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
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors
    • H03H7/07—Bridged T-filters
    • 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
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1716—Comprising foot-point elements
    • H03H7/1725—Element to ground being common to different shunt paths, i.e. Y-structure
    • 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
    • H03H7/01—Frequency selective two-port networks
    • H03H7/075—Ladder networks, e.g. electric wave filters

Abstract

539,444. Impedance networks. STANDARD TELEPHONES & CABLES, Ltd., and JACOBSEN, B. B. March 8, 1940, No. 4361. [Class 40 (iii)] A band-elimination filter comprises two or more sections of the form shown in Fig. 2,.or its equivalent shown in Fig. 8, the resistance r being inherent in the inductance L and the resistance y being chosen to give infinite attenuation at a certain frequency. Since the value of the inductance L depends to some extent on the current therethrough, the first section is dimensioned to give maximum attenuation at the desired frequency for the maximum input current it is likely to receive, while the second and any succeeding sections are correspondingly adjusted for the lower input thereto. In addition the discrimination effect is improved by a series resistance Rs, Fig. 2, or a shunt resistance RSH, Fig. 8, at the junction of two sections in order to bring about a reflection loss at that point. To prevent the impedance of the filter of Fig. 2 becoming too high at low frequencies, a shunt resistance may be connected to the mid-point of Rs, or a pair of shunt resistances may be bridged across the terminals. Fig. 9 shows a modification employing one section of each of the types used in Figs. 2, 8, with both series and shunt resistances Rs, RSH, such that their product is equal to the square of the terminating resistance.
GB436140A 1940-03-08 1940-03-08 Improvements in electrical networks Expired GB539444A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE476737D BE476737A (en) 1940-03-08
FR956090D FR956090A (en) 1940-03-08
GB436140A GB539444A (en) 1940-03-08 1940-03-08 Improvements in electrical networks
GB918740A GB541380A (en) 1940-03-08 1940-05-24 Improvements in or relating to electric transmission networks
ES0177213A ES177213A1 (en) 1940-03-08 1947-03-13 IMPROVEMENTS IN ELECTRICAL DEVICES
FR57894D FR57894E (en) 1940-03-08 1947-12-23 Electrical networks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB436140A GB539444A (en) 1940-03-08 1940-03-08 Improvements in electrical networks

Publications (1)

Publication Number Publication Date
GB539444A true GB539444A (en) 1941-09-10

Family

ID=9775714

Family Applications (2)

Application Number Title Priority Date Filing Date
GB436140A Expired GB539444A (en) 1940-03-08 1940-03-08 Improvements in electrical networks
GB918740A Expired GB541380A (en) 1940-03-08 1940-05-24 Improvements in or relating to electric transmission networks

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB918740A Expired GB541380A (en) 1940-03-08 1940-05-24 Improvements in or relating to electric transmission networks

Country Status (4)

Country Link
BE (1) BE476737A (en)
ES (1) ES177213A1 (en)
FR (2) FR57894E (en)
GB (2) GB539444A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959752A (en) * 1959-03-25 1960-11-08 Hycon Eastern Inc Selective low distortion crystal filter

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558748A (en) * 1945-12-14 1951-07-03 Andrew V Haeff Radio-frequency filter
US2676309A (en) * 1950-04-05 1954-04-20 William J Armstrong High-frequency power transmission line for cyclotrons and the like
US2841771A (en) * 1951-04-18 1958-07-01 Frank S Dunleavey Four-terminal filter embodying an ionized medium
US2683862A (en) * 1951-07-11 1954-07-13 Raytheon Mfg Co Tunable resonant structure
BE542180A (en) * 1953-01-21
NL202113A (en) * 1954-03-05
US2926317A (en) * 1954-03-11 1960-02-23 Sanders Associates Inc Transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959752A (en) * 1959-03-25 1960-11-08 Hycon Eastern Inc Selective low distortion crystal filter

Also Published As

Publication number Publication date
GB541380A (en) 1941-11-25
FR57894E (en) 1953-09-18
BE476737A (en)
FR956090A (en) 1950-01-24
ES177213A1 (en) 1947-04-16

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