US1603806A - Filter chain - Google Patents

Filter chain Download PDF

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Publication number
US1603806A
US1603806A US580470A US58047022A US1603806A US 1603806 A US1603806 A US 1603806A US 580470 A US580470 A US 580470A US 58047022 A US58047022 A US 58047022A US 1603806 A US1603806 A US 1603806A
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United States
Prior art keywords
chain
curve
resonance
peaks
coupling
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Expired - Lifetime
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US580470A
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English (en)
Inventor
Riegger Hans
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.)
Siemens and Halske AG
Siemens Corp
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Siemens Corp
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Publication date
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Publication of US1603806A publication Critical patent/US1603806A/en
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    • 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
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

Definitions

  • AKTIENGESELLSCHAFT OF SIEMENSSTADT, NEAR BERLIN, GERMANY, A CORPORA- TION 0F GERMANY.
  • Fig. 1 shows a resonance curve of the simplest form, characteristic of a damped circuit
  • Fig. 2 shows an ideal resonance curve of rectangular form
  • Fig. 3 shows the resonance curve of a five-link filter chain
  • Fig. 4 shows the resonance curves of a chain with two oscillatory circuits and of a chain with three oscillatory circuits
  • Fig. 5 shows the curve produced by the chain of fivelinks
  • Fi 6 represents a circuit'diagram of a five-llnkchain referred to in Fig. 5;
  • Fig. 7 shows the damping curve and the damping and coupling curve of a cham, one part of which consists of one link and the other part ofv two links
  • Fig. 8 is a diagramof aresonance curve FILTER CHAIN.
  • Fig. 9 shows the resonance curves of the different parts of an improved filter chain
  • Fig. 10 shows the resonance curve of the entire chain.
  • Fig. 1 I designates the resonance curve at smaller'damping and II the resonance curve at greater damping.
  • abscissac the frequencies, and as ordinates the amplitudes of current, are plotted.
  • the oscillatory circuit is tuned to the period of vibrations (0 The requirement is that the frequencies within the range w--o" freely pass through the circuit, but that frequencies below or above that range should be excluded.
  • the figure shows that an oscillatory circuit with the resonance curve II produced by increased damping is not a satisfactory expedient. For,- it will be observed that those frequencies' which correspond exactly to the desired frequency are considerably reduced in oscillation amplitude, whereas the undesired frequencies are not sufliciently suppressed.
  • the ideal would be a resonance curve of rectangular form as shown in Fig. 2. With this curve, all frequencies between a and or would be transmitted equally well, but all other fre quencies would' be almost entirely suppressed.
  • the frequency range to be transmitted can be enlarged by providing a close coupling of the individual I that this curve is already much more similar to the rectangular curve shown in Fig.2 than the resonance curve II of Fig. 1.
  • the present invention relates to a special kind of filter chain, in which, by calculation or by designing, a favourable form of the resonance curvecan be produced.
  • the filter chains are characterized by the feature that the degree of coupling between two of their links is so loose that between these two links no noticeable efiiect of coupling resonance is produced, while the coupling between all other links is closer, e. g. so close that distinct couplingrresonance points are produced.
  • The; looserci'o'upling point separates thus the chain-'iainto two parts, each part by itself possessing its individual resonance curve.
  • Each of the twocurves shows a number of peaks which are the more pronounced the closer the coupling is between the individual links of the corresponding part of the chain. The greater the damping is made at the same degree of cou pling, thecloser will the peaks come together.
  • the number of and the distance between the peaks can be determined by calculation.
  • the calculation becomes specially simple if each part per se of the chain is made homogenous, e. g. if all the links of the correspondin part of the chain are tuned to the'same requency and have the same damping andv if the different links possess the same degree of coupling. i Even if the decrements .do not agree , a common average decrement can be used for the calculation, provided, of course, that the number of links is not too large.
  • a resonance curve is obtained which resembles very nearly the rectangular curve, provided the peaks and the valleys of each part are selected in such a manner'that the peaks of one resonance curve are located between the peaks of the other resonance curve.
  • This can be car-- ried out in a particularly easy manner if one part Ofzthe' chain has an even number of linksand the other part an odd number of links. In thiscase, a valley will occur at the middle of the first Chfilll part and a peak at;the middle. of the other chain part.
  • III is the resonance curve of a chain with two oscillatory circuits, and IV that of a chain with three oscillatory circuits.
  • the circuits are diagrammatically shown in Fi 6.
  • the first part of the chain consists of the oscillatory circuits 1 and 2 which are closely coupled with each other and excited by the windings 6.
  • the second part of the chain consists of the oscillatory circuits 3, 4, 5.
  • the fifth oscillatory circuit 5 transmits the energy to the windings 7 whichconduct the same to any receiving device desired.
  • the coupling between 1 and 2 is so close that a distinct two peak curve is produced such as shown at III in Fig. 4E.
  • the oscillatory circuits 3, 4, 5 are also coupled with each other so closely that the effect of the coupling resonance is distinctly perceivable (curve IV, Fig. 4), although the formation of several peaks has not yet been attained. If now the first part of the chain and the second part are coupled with each other by loosely coupling the oscillatory circuits 2 and 3, the curves III and IV will coincide. In order to find out, as function.
  • Fig. 9 shows the resonance curves VII and VIII of the individual parts of a chain by the superposition of which portions the resonance curve of the entire chain shown in Fig. 10 is produced.
  • the curve portion of Fig. 10 drawn, in full hnes is. the resonance curve with loose couplmg between the two parts of the chain. The figure shows that the two lateral peaks e and f are considerablyhigher than the middle peak g.
  • Filter chain for transmitting oscillations within a limited range of frequencies comprising at least two coupled groups of oscillatory circuits, at least one of said groups comprising at least two adjacent oscillatory circuits, coupled with each other suificiently close to produce a resonance curve of that group having at least two peaks, the resonance peaks of one group of circuits occurring at frequencies different from those at which the peaks of the other group occur.
  • Filter chain for transmitting oscillations within a limited range of frequencies comprising at least two coupled groups of oscil atory circuits, at least one of said groups comprising at least two adjacent oscillatory circuits, coupled with each other sufliciently close to produce a resonance curve of that group having at least two peaks, the resonance peaks of one group of circuits coinciding wlth the resonance valleys of the other group.
  • a filter chain for transmitting oscilla-v tions within a limited range of frequencies comprising at least two groups of osclllatory circuits, eachof said two groups comprising at least two adjacent oscillatory circuitscoupled with each other sufiiciently closeto produce a resonance curve group having at least two peaks, and means for loosely coupling said groups with each other.
  • a filter chain according to claim 4 in which the resonance peaks of one group of circuits occur at frequencies different from those'at which the peaks of the other group occur.
  • a filter, chain according to claim. 4 in which the resonance peaks of one group of circuits substantially coincide with the resonance valleys of the other group.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Vibration Prevention Devices (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US580470A 1921-09-01 1922-08-08 Filter chain Expired - Lifetime US1603806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES57426D DE393469C (de) 1921-09-01 1921-09-01 Siebkette zur UEbertragung von Schwingungen eines bestimmten Frequenzbereiches

Publications (1)

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US1603806A true US1603806A (en) 1926-10-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US580470A Expired - Lifetime US1603806A (en) 1921-09-01 1922-08-08 Filter chain

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US (1) US1603806A (de)
AT (1) AT97599B (de)
DE (1) DE393469C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617882A (en) * 1950-05-29 1952-11-11 Rca Corp Maximal flatness filter
US2710315A (en) * 1950-11-03 1955-06-07 Ben H Tongue Wide-band amplifying system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617882A (en) * 1950-05-29 1952-11-11 Rca Corp Maximal flatness filter
US2710315A (en) * 1950-11-03 1955-06-07 Ben H Tongue Wide-band amplifying system

Also Published As

Publication number Publication date
DE393469C (de) 1924-04-04
AT97599B (de) 1924-08-11

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