US2201338A - Wave filter - Google Patents

Wave filter Download PDF

Info

Publication number
US2201338A
US2201338A US177867A US17786737A US2201338A US 2201338 A US2201338 A US 2201338A US 177867 A US177867 A US 177867A US 17786737 A US17786737 A US 17786737A US 2201338 A US2201338 A US 2201338A
Authority
US
United States
Prior art keywords
frequencies
bridge
circuits
series
circuit
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 - Lifetime
Application number
US177867A
Other languages
English (en)
Inventor
Hassler Gerhard
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.)
General Electric Co
Original Assignee
General Electric Co
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
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2201338A publication Critical patent/US2201338A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/175—Series LC in series path
    • 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
    • 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
    • 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
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • 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
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1783—Combined LC in series path
    • 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
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1791—Combined LC in shunt or branch path

Definitions

  • damping poles denotes a frenot be increased indefinitely, the antieresonant quency at which the attenuation is very high, impedances of the flywheel circuits cannot be fly theoretically speaking, at which the attenuation made sufiiciently high to produce very pronounced or damping becomes infinitely high. damping poles.
  • Such wave filters can be obtained in various In order to avoid this difficulty, it is proposed ways. They may be formed of bridge circuits in accordance with the invention, that the filter or equivalent circuits. In these circuits the sections which are to produce the damping poles damping poles are produced in that the bridge is lying in the proximity of the limit frequencies, be
  • Figure 2 shows the bridge member which is balanced. l the equivalent of the vr-member of Figure 1 It It is known that such wave filters may also be has the same wave resistance characteristic imbuilt up by the series connection of sections or pedance as the 1r-member.
  • the energy is supchain parts of the typeknown as T- or w-circuit. plied to the terminals 1, I and derived at the In this type of circuit, the various damping terminals 2, 2.
  • the two perfectly identical fly poles are arranged to occur in the different secwheel circuits S1 and S2 are connected to the tions.
  • the damping poles are produced in that symmetrical differential transformer Us.
  • Figure 2 is the equivalent bridge cirbalance of thebridge, there is placed in parallel cult of the filter of Figure 1
  • Figure 3 is another to the fiy wheel circuit S1 an ohmic resistor R form of the invention applied to a T type section which corresponds with the anti-resonance reof a filter
  • Figure 4 is the equivalent bridge sistance of the fly wheel circuits S3 and S4.
  • FIG. 3 shows a T -section, in which series resonance circuits are inserted in the series branch and parallel branch.
  • Figure 4 shows the equivalent bridge circuit.
  • the energy is again supplied to the. terminals 5, I.
  • the differential transformer Ue has the two series resonance circuits S1 and S2 connected thereto.
  • S2 has in series therewith two further series resonance circuits S3 and S4 having at the pole frequencies a negligibly low ohmic resistance. This low resistance is reproduced at the otherside'of the bridge by the ohmic resistor R.
  • a corresponding resistor r can be connected in series to the one. If an extremely accurate balance is required then in amanner analogous to the above-described example, the reactance of the series resonance circuit S3 or S4 which is not in resonance must likewise bereproduced on the other side of the bridge. At the terminals 2 and 2 the energy is derived from the filter.
  • a transmission network adapted to be connected in series with a band pass filter having a pair of cut-off frequencies and large attenuation at frequencies remote from the range of frequencies between said cut-01f frequencies but relatively little attenuation at frequencies closely adjacent said cut-off frequencies, said network being in the form of a Wheatstone bridge having arms so constituted as to produce a substantial reactance balance at two rejection frequencies,
  • a transmission network adapted to be connected in series with a band pass filter having a pair of cut-off frequencies and large attenuation at frequencies remote from the range of frequencies between said cut-off frequencies but relatively little attenuation at frequencies closely adjacent said cut-off frequencies said network being in the form of a Wheatstone bridge having a parallel resonant circuit in one arm and a similar circuit shunted by a pair of series-connected parallel circuits resonant to the rejection frequencies forming a second arm of the bridge, the bridge arms being so constituted as to produce a substantial reactance balance at the two rejection frequencies, one of which is closely adjacent one of said cut-off frequencies and the other of which is closely adjacent the other of said cut-olf frequencies, a resistance in shunt to the circuit in the first arm and a second resistance in shunt to one of the circuits in the second arm, said resistances producing a resistance balance of said bridge at said two rejection frequencies.
  • a transmission network adapted to be connected in series with a band pass filter having a pair of cut-off frequencies and large attenuation at frequencies remote from the range of frequencies between said cut-off frequencies but relatively little attenuation at frequencies closely adjacent said cut-01f frequencies, said network being in the form of a Wheatstone bridge having a series resonant circuit in one arm and a similar circuit having serially connected thereto a pair of parallel connected series resonant circuits resonant to the rejection frequencies forming the conjugate arm of the bridge, the bridge arms being so constituted as to produce a substantial reactance balance at the two rejection frequencies, one of which is closely adjacent one of said cut-off frequencies and the other of which is closely adjacent the other of said outoff frequencies, a resistance in series with the circuit in the first arm and a second resistance in series with one of parallel connected series circuits in the second arm, said resistances producing a resistance balance of said bridge at said two rejection frequencies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US177867A 1936-12-09 1937-12-03 Wave filter Expired - Lifetime US2201338A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201426X 1936-12-09
DE20337X 1937-03-02

Publications (1)

Publication Number Publication Date
US2201338A true US2201338A (en) 1940-05-21

Family

ID=25748709

Family Applications (1)

Application Number Title Priority Date Filing Date
US177867A Expired - Lifetime US2201338A (en) 1936-12-09 1937-12-03 Wave filter

Country Status (4)

Country Link
US (1) US2201338A (xx)
CH (1) CH201426A (xx)
FR (1) FR829577A (xx)
NL (1) NL55872C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475706A (en) * 1966-08-24 1969-10-28 Jewel D Browder Signal-to-noise ratio enhancer utilizing bridge circuit having two arms of differing resonant frequency but similar inductance and resistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475706A (en) * 1966-08-24 1969-10-28 Jewel D Browder Signal-to-noise ratio enhancer utilizing bridge circuit having two arms of differing resonant frequency but similar inductance and resistance

Also Published As

Publication number Publication date
NL55872C (xx)
FR829577A (fr) 1938-06-30
CH201426A (de) 1938-11-30

Similar Documents

Publication Publication Date Title
US3581122A (en) All-pass filter circuit having negative resistance shunting resonant circuit
US2199921A (en) Wave filter
US2122748A (en) Four-pole device containing nonlinear resistors
US2718622A (en) Attenuation equalizer
US3868604A (en) Constant resistance adjustable slope equalizer
US2147728A (en) Phase changer
US2201338A (en) Wave filter
US3271705A (en) Electric wave filter
US2567380A (en) Parallel telectrical wave transmission network
US3569873A (en) Insertion loss equalization device
US2029014A (en) Wave transmission network
US2452114A (en) Balanced wave filter
US2459019A (en) Piezoelectric crystal filter
US2204702A (en) Piezoelectric crystal filter with inductive shunt
US3344369A (en) Tee-network having single centertapped high-q inductor in its series branches and a low-q inductor in shunt
US1615252A (en) Electrical wave filter
US3231837A (en) All-pass transformer coupling network utilizing high frequency and low frequency transformers in parallel connection
US2623945A (en) Adjustable electrical phaseshifting network
US2240142A (en) Wave filter
US3496495A (en) Adjustable attenuation equalizer having equalizing branches inductively coupled to the transmission path
US2198684A (en) Wave filter
RU171584U1 (ru) Перестраиваемый режекторный фильтр
US2991433A (en) Adjustable attenuation correcting networks
US2281621A (en) Band pass filter
US3051920A (en) Active two-port network