US3200355A - Electrical connector having rf filter - Google Patents

Electrical connector having rf filter Download PDF

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Publication number
US3200355A
US3200355A US154807A US15480761A US3200355A US 3200355 A US3200355 A US 3200355A US 154807 A US154807 A US 154807A US 15480761 A US15480761 A US 15480761A US 3200355 A US3200355 A US 3200355A
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United States
Prior art keywords
terminal
bore
filter
contact
inductor
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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
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US154807A
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English (en)
Inventor
Theodore E Dahlen
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.)
TDK Micronas GmbH
International Telephone and Telegraph Corp
Original Assignee
Deutsche ITT Industries GmbH
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 Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to US154807A priority Critical patent/US3200355A/en
Priority to BE648570D priority patent/BE648570A/xx
Application granted granted Critical
Publication of US3200355A publication Critical patent/US3200355A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
    • H01R13/7197—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters with filters integral with or fitted onto contacts, e.g. tubular filters

Definitions

  • the invention relates more particularly to such a multicontact electrical connector wherein one or more RF filter elements comprising either a capacitor or an inductor, or both, are electrically coupled with contact terminals of one of the connector members so as to attenuate or ground out unwanted RF signals which might otherwise pass through the connector.
  • RF filter which may include one or more capacitors, and which preferably also includes at least one inductor, and it is frequently particularly desirable to embody such RF filter components in an electrical connector so that the circuit is not interrupted by the filter at any other point.
  • RF filter components in many circuits it is necessary or desirable to include and RF filter which may include one or more capacitors, and which preferably also includes at least one inductor, and it is frequently particularly desirable to embody such RF filter components in an electrical connector so that the circuit is not interrupted by the filter at any other point.
  • the embodying of RF filter components in one or more electrical connectors eliminates the necessity for a large amount of expensive shielding which would otherwise be required.
  • an object of the present invention to provide an electrical connector member having one or more contact terminals mounted therein, and which embodies one or more RF filter elements or components electrically coupled with each of the contact terminals so as to suppress or ground out unwanted RF signals which may be applied to the terminals.
  • Another object of the present invention is to provide an electrical connector of the character described wherein one of the connector members embodies one or more RF filter elements or components electrically associated with one or more contact terminals therein, and wherein the contact terminals and the RF filter elements are removable and replaceable in the connector member so that damaged parts can be removed and replaced and the values of the filter elements or components can be changed.
  • Another object of the invention is to provide an electrical connector member of the character described having one or more contact terminals mounted therein, wherein at least one capacitor component is arranged so as to shunt RF signals from each contact terminal to a conducting shell of the connector so as to ground out RF signals which may be applied to the contact terminals, and which may also include inductor means associated with each contact terminal so as to present a barrier to RF signals which may be applied to the terminals.
  • a further object of the present invention is to provide an electrical connector member of the character described having RF filter components therein, wherein the RF filter components are mounted on the individual contact terminals, and these contact terminals are removably supported in the body of the connector member, whereby the RF filter components can be replaced merely by removal and replacement of the contact terminals themselves.
  • FIG. 1 is an axial sectional view, partly in elevation, illustrating a presently preferred embodiment of the invention wherein the RF filter elements or components are mounted on removable contact terminals.
  • FIG. 2 is a greatly enlarged fragmentary section of a part of FIG. 1, illustrating details of construction of one of the contact terminals and its mounting in the connector member.
  • FIG. 3 is a schematic diagram illustrating the RF electrical circuit associated with the contact terminal shown in FIG. 2.
  • FIG. 4 is an enlarged fragmentary section showing a connector member having an external shell similar to that of FIG. 1, but embodying an alternative contact terminal and terminal supporting structure wherein the RF filter components are primarily embodied in the body portion of the connector member.
  • FIG. 5 is an enlarged fragmentary sectional view illustrating a further embodiment of the invention which is a variation of the embodiment shown in FIG. 4.
  • a connector member 10 is shown, and comprises the receptacle portion of an electrical connector which also includes a mating plug portion (not shown).
  • the connector member 10 includes a tubular outer metal shell 12 having a rearward portion 14 and a forward skirt portion 16, with an inwardly directed flange 18 between the portions 14 and 16.
  • a contact terminal supporting body 20 is removably mounted in the rearward portion 14 of shell 12, being retained against forward movement in the shell by abutment of a forwardly facing shoulder 22 on the body 20 against flange 18 in the shell.
  • a rearwardly facing shoulder 24 on the body 20 is engaged by a retainer 26 to prevent rearward movement of body 20 in the shell, the retainer 26 being fastened to the shell by means of screws 28.
  • the contact terminal supporting body 26 is made in two parts, a rearward body portion 39 composed of a conducting material and a forward body portion 32 composed of insulation material.
  • the body portions 30 and 32 may be bonded together as by means of a suitable bonding cement.
  • Suitable conducting materials of which the rearward body portion 30 may be composed are solid metal, which may be die cast or machined, sintered metal, or a resin modified by inclusion of a powdered metallic filler so as to be conductive, such as diallyl phthalate embodying finely powdered copper.
  • a resin modified to be conductive is that it can be molded much in the manner of an ordinary connector insulation body.
  • the contact terminal supporting body has a plurality of terminal receiving bores 34 extending therethrough from the rearward face 36 of the body 20 to the forward face 38 of body 20.
  • Each of the bores 34 has a generally cylindrical forward constricted portion 40 disposed in the forward insulation portion 32 of the body, and an enlarged rearward portion 42, the bore including a rearwardly facing shoulder 44 between the generally cylindrical forward portion 40 and the enlarged rearward portion 42. Additionally, a constriction is provided at the rear end of the enlarged rearward portion 42 of the bore so as to present a forwardly facing shoulder 46.
  • a contact retention sleeve 48 is seated in the enlarged rearward portion 42 of the bore, the sleeve 48 comprising a split spring sleeve member that can be contracted and inserted into the bore through the rear end thereof and then permitted to expand into position as best shown in FIG. 2 so that its forward edge is abuttable against the rearwardly facing shoulder 44 to prevent forward movement of sleeve 48 and its rearward edge is abuttable against the forwardly facing shoulder 46 to prevent rearward movement of sleeve 48 in the bore.
  • One or more spring retention fingers 50 are struck inwardly from the wall of the contact retention sleeve 48 so as to incline forwardly and radially inwardly.
  • spring retention fingers 50 preferably are integrally joined with the body of sleeve near the rear end of the sleeve. Additionally, one or more spring contacting fingers 52 are struck inwardly from the wall of the retention sleeve 48 forwardly of the retention fingers 50. Electrical connection is present from the contacting fingers 52 through the sleeve 48 and through the conducting rearward body portion to the outer metal shell 12, so that when the outer shell 12 is grounded, the spring contacting fingers 52 will likewise be at ground potential.
  • the bores 34 extending through the terminal supporting body 20 are adapted to receive respective socket contact terminals 54.
  • the invention is equally applicable to pin contact terminals, or to any other type of terminal capable of mating with an opposing terminal in another connector member, as for example a hermaphrodite type of terminal.
  • Each of the socket contact terminals 54 includes a generally cylindrical tubular forward socket portion 56 which fits into the forward bore portion and is adapted to receive a mating pin, a reduced cylindrical intermediate portion 58, and a generally cylindrical tubular rearward portion 60 within which a conductor wire may be soldered or crimped.
  • annular RF filter unit 62 Mounted on the reduced cylindrical intermediate portion 58 of the contact terminal 54 is an annular RF filter unit 62.
  • This unit includes a generally cylindrical capacitor barrel 64 composed of conducting material and which, like the conducting rearward body portion 30, may be composed of solid or sintered metal or a resin that is modified to be conductive. If the conducting capacitor barrel 64 is of this modified conductive resin type, it can readily be molded in position about the reduced cylindrical portion 58 of the contact terminal.
  • the barrel 64 has a cylindrical inner wall 66 and a cylindrical outer wall 68, and includes a forward surface 70 and a reduced rearward portion 72 presenting a rearwardly facing shoulder 74.
  • An annular inductor bead 76 is disposed within the barrel 64 of RF filter unit 62 intermediate the ends of the barrel 64, the inductor bead 76 having a cylindrical inner surface 78.
  • the inner surface 78 of head 76 may either be in direct contact with the reduced cylindrical intermediate portion 58 of the contact terminal, or it may be slightly spaced outwardly therefrom. Even if the head 76 is in direct contact with the portion 58 of the terminal, the volume resistivity of the bead is so high that there is no substantial DC. leakage between the terminal 54 and the barrel 64.
  • Inductor bead 76 is composed of a ferromagnetic material having a suitable permeability.
  • Ferrite is the presently preferred material for the inductor bead 76, this being a ceramic ferromagnetic material. It is to be understood, however, that the invention is not limited to the use of any particular type of ferromagnetic material for the inductor bead 76.
  • a pair of dielectric sleeves $0 and 82 are disposed,
  • I respectively, rearwardly and forwardly of the inductor bead 76 between the cylindrical intermediate portion 58 of the terminal and the cylindrical inner wall 66 of the barrel 64.
  • a presently preferred dielectric material is barium titanate, which has a relatively high dielectric constant. Examples of other materials which can be used are Teflon and nylon. Even an air gap could be employed as the dielectric if desired.
  • Each end of the capacitor barrel 64 is electrically isolated from the adjacent opposed shoulder on the contact terminal 54 by a layer 83 of insulating material.
  • the RF filter unit 62 provides an RF circuit arrangement like that illustrated diagrammatically in FIG. 3, which is a 1r type of filter.
  • the contact terminal 54 is represented in FIG. 3 as a conductor 84.
  • Disposition of the inductor bead 76 about the reduced intermediate portion 58 of the terminal has the electrical effect of the inductor 86 in the conductor 84 in FIG. 3.
  • the gap defined by dielectric sleeve 80 between the reduced intermediate portion 58 of the contact terminal and the barrel 64 has the effect of the capacitor 88 shown in the diagram of FIG. 3, while the similar gap defined by the dielectric sleeve 82 at the other side of the inductor head 76 has the electrical effect of the capacitor 89 shown in the diagram of FIG. 3.
  • Grounding of the capacitors is effected by the electrical connection between the spring cont-acting fingers 52 of the retention sleeve 48 and the cylindrical outer wall 68 of the capacitor barrel 64.
  • the capacitance across each of the dielectric sleeves 80 and 82 can be varied by variation of the type of dielectric material used, width of the dielectric gap, length of the dielectric gap, and diameter of the dielectric gap.
  • the amount of inductance of the inductor head 76 may be varied by varying the composition of the ferromagnetic material employed therein, and by varying the size and configuration of the head.
  • the contact terminal 54 is removably mounted in the bore of the supporting body 20 merely by insertion of the terminal into the bore from the rearward end of the bore. 'For ward travel of the terminal in the bore is limited by abutment of the forward surface 70 of barrel 64 against the rearwardly facing shoulder 44 in the bore.
  • the annular enlargement presented by the barrel 64 will deflect the spring retention fingers 5t outwardly until the rearwardly facing shoulder 74 on the barrel 64 passes the free ends of the fingers 50, at which time the fingers 50 will spring back inwardly behind the shoulder 74 on the barrel 64 to releasably lock the contact in its operative position in the bore. In this position, the spring contacting fingers 52 will be resiliently engaged against the outer cylindrical wall 68 of the barrel 64 in electrical contact therewith.
  • Removal of the contact terminal 54 from the bore is effected by insertion of a suitable tool into the rear end of the bore so as to deflect the retention fingers 50 outwardly past the rearwardly facing shoulder 74 on the barrel 64, permitting manual withdrawal of the contact from the bore.
  • This removable mounting of the contact terminals 54 in the bore permits replacement of one or more of the terminals for any desired reason, such as in the event of damage to a terminal or to the parts, thereof effecting the electrical characteristics of the RF filter unit, or for changing the values of the capacitor or induct or components of one or more of the RF filter units, or for re constituting one or more circuits associated with the connector.
  • FIG. 4 illustrates an alternative embodiment of the invent-ion wherein the :RF filter unit is carried principally in the body of the connector member rather than in the contact terminal itself.
  • the connector body designated generally by the numeral 90 in FIG. 4, may be mounted in an outer metal shell 91 generally similar to the shell 12 shown in FIG. 1. However, the shell 91 is shown as a plug shell rather than a receptacle shell as in FIG. 1.
  • the body 90 is made up principally of a series of plates which are bonded together as a unit, and including, from rear to front, a rearward insulator plate 92 a first conductive plate 94, an inductor plate 96, a second conductive plate 98, and a forward insulator plate 100.
  • a plurality of parallel terminal receiving bores 102 extend through the body 90 from its rearward face 104 to its forward face 106.
  • the rearward insulator plate 92 has an enlarged rear- Ward portion 108 of each of the bores 102 therein, each bore presenting a rearwardly facing shoulder 110 at the forward end of the enlarged portion 108.
  • An inwardly directed lip is provided proximate the rear end of each enlarged bore portion 108 presenting a forwardly facing shoulder 11-2.
  • a contact retention sleeve 114 comprising a split spring sleeve is engaged in the enlarged bore portion 108, and is prevented from moving forwardly by the shoulder 110 and from moving rearwardly by the shoulder 112.
  • the contact retention sleeve 114 has one or more spring retention fingers 116 struck inwardly from the wall thereof so as to extend forwardly and radially inwardly from their connections with the body of the sleeve 114.
  • the contact terminal 118 shown in FIG. 4 is again one of a plurality of socket contact terminals mounted in the respective bores 102, although it is to be understood that a pin contact terminal or any other desired type of terminal may be employed.
  • the contact terminal 118 has an elongated body portion 120 of general- 1y cylindrical external configuration which is disposed primarily in the portion of the bore 102 which extends through the plates 94, 96, 98 and 100, and this elongated Ibody portion 120 has a tubular forward socket portion 122 adapted to receive a mating pin.
  • the contact terminal 118 includes an annular collar 124 immediately to the rear of the elongated body portion 120, and the rearward end of contact terminal 113 comprises a tubular portion 126 within which a wire conductor may be soldered or crimped.
  • the contact terminal 118 is engaged in the bore 102 by insertion from the rear end thereof, and the forward limit of travel of the terminal 118 is defined by engagement of the annular collar 124 against the rearwardly facing shoulder 110 in the bore.
  • the terminal may then be removed by insertion of a suitable tool into the rear end of the bore so as to deflect the fingers 116 radially outwardly past the outer extremity of the annular collar 124, which permits extraction of the contact terminal from the rear end of the bore.
  • the conductive plates 94 and 98 may be die cast or machined of metal, or may comprise sintered metal or a resin modified to be conductive, such as the aforesaid diallyl phthalate which includes finely powdered metallic filler, and the outer peripheries of these conductive plates 6 94 and 98 are electrically contacted to the metallic outer shell by means of a suitable annular contacting spring 128.
  • the inductor plate 96 is composed of a suitable ferromagnetic material having the desired permeability, as for example a ferrite composition.
  • the volume resistivity of inductor plate 96 is so high that there is substantially no D'.C. leakage between the terminal 118 and either of the conductive plates 94 and 98, even if the inductor plate 96 were to touch the terminal.
  • the portion of the bore 102 lying within the first conductive plate 94 is lined with a dielectric sleeve 130, while the portion of bore 102 within the second conductive plate 98 is lined with a dielectric sleeve 132, the dielectric sleeves 130 and 132 being composed of any suitable dielectric material having the desired dielectric characteristics, as for example barium titanate, Teflon, nylon, or if desired simply an air gap.
  • FIG. 4 provides a 1r type of RF filter similar to the structure of FIGS. 1 and 2, as diagrammatically illustrated in FIG. 3.
  • the contact terminal 118 is represented by the conductor 84 in FIG. 3, and the portion of the inductor plate 96 immediately surrounding the contact terminal functions as the inductor 86 of FIG. 3.
  • the gap defined by dielectric sleeve 130 between the contact terminal 118 and the bore portion which extends through the first conductive plate 94 is represented by the capacitor 88 in FIG. 3, while similarly the gap defined by dielectric sleeve 132 between the contact terminal 118 and the bore portion within the second conductive plate 98 is represented by the capacitor 89 in FIG. 3.
  • FIG. 5 The structure shown in FIG. 5 is similar to that of FIG. 4, with the exception that the inductor plate 96 of FIG. 4 has been replaced in FIG. 5 by an insulator plate 134 which supports a plurality of inductor beads 136 in annularly disposed relationship about the respective contact terminals 118, with an inner cylindrical surface 138 of each inductor bead 136 defining a portion of the respective bore 102.
  • an insulator plate 134 which supports a plurality of inductor beads 136 in annularly disposed relationship about the respective contact terminals 118, with an inner cylindrical surface 138 of each inductor bead 136 defining a portion of the respective bore 102.
  • An electrical connector and filter assembly comprising a body member having a conductive outer portion and having a bore extending therethrough, a contact terminal slidably mounted in said bore and adapted to be separably connected to a mating terminal in a second body, an electrically conducting capacitor member mounted on said contact terminal in encircling relationship to a portion thereof, electrically insulated therefrom and having a surface spaced from an opposed surface of said terminal to define a capacitor gap therewith, inductor means composed of ferromagnetic material mounted on said terminal in encircling relationship to a portion thereof, electrically conducting spring means supported on one of said members and releasably engaging the other member to releasably lock said terminal in said bore, said spring means conductively engaging said capacitor member and being electrically connected to said conductive outer portion of said body member whereby upon release of said spring means said terminal, capacitor member and inductor means may be removed as a filter unit from said body.
  • capacitor member comprises a unitary sleeve, said inductor means comprising an annular ring seated in the inner periphery of said sleeve.
  • An electric connector and filter assembly as defined in claim 1 including a dielectric sleeve between said opposed surfaces to provide capacitance reactance.

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US154807A 1961-11-24 1961-11-24 Electrical connector having rf filter Expired - Lifetime US3200355A (en)

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US3275954A (en) * 1963-08-20 1966-09-27 Erie Technological Prod Inc Multiple connector wherein pins have limited movement within housing and each pin has integral low-pass filter
US3275953A (en) * 1963-08-20 1966-09-27 Erie Technological Prod Inc Multiple pin connector having ferrite bead-capacitor filter
US3289118A (en) * 1962-03-29 1966-11-29 Globe Union Inc Filter
US3297969A (en) * 1964-02-12 1967-01-10 Gen Instrument Corp Low pass filter which dissipatively and reactively attenuates high frequencies
US3320557A (en) * 1963-04-02 1967-05-16 Globe Union Inc Feed-through capacitor
US3324426A (en) * 1964-10-08 1967-06-06 Brueckmann Helmut Variable impedance transmission line
US3329911A (en) * 1963-02-25 1967-07-04 Allen Bradley Co Low transfer impedance capacitor with resistive electrode
US3335396A (en) * 1964-09-14 1967-08-08 Pyle National Co Electrical connector with collet retention means
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US3435387A (en) * 1965-09-01 1969-03-25 Allen Bradley Co Solderless mounting filter connection
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US3456215A (en) * 1964-09-02 1969-07-15 Peter A Denes High frequency low pass filter
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US3521200A (en) * 1961-04-28 1970-07-21 Tdk Electronics Co Ltd Combined unit of impedance
US3539954A (en) * 1969-07-29 1970-11-10 Itt Removable electrical connector filter assembly
US3582862A (en) * 1969-01-22 1971-06-01 Bunker Ramo Connector device with integral reference plane
US3597711A (en) * 1969-01-23 1971-08-03 Itt Removable electrical connector filter
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US3678341A (en) * 1970-08-05 1972-07-18 Del Electronics Surge voltage protection system
US3721869A (en) * 1971-11-22 1973-03-20 Hubbell Inc Harvey Filter contact connector assembly with contact pins having integrally constructed capacitors
US3743979A (en) * 1971-07-15 1973-07-03 Amp Inc Filtered connector with barrel spring contact
US3743925A (en) * 1970-11-27 1973-07-03 Thomas & Betts Corp Adapter for terminating multiconductor signal transmission cable
US3753168A (en) * 1972-03-09 1973-08-14 Amp Inc Low pass filter network
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US4260966A (en) * 1977-12-23 1981-04-07 Bunker Ramo Corporation High current filter connector with removable contact members
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US4397517A (en) * 1981-05-22 1983-08-09 Amp Incorporated Repairable connector
US4421378A (en) * 1979-11-07 1983-12-20 The Bendix Corporation Electrical contact retention insert and means for molding same
DE3410331A1 (de) * 1983-03-29 1984-10-04 Deutsche Itt Industries Gmbh, 7800 Freiburg Elektrischer steckverbinder
US4500159A (en) * 1983-08-31 1985-02-19 Allied Corporation Filter electrical connector
US4572600A (en) * 1985-02-28 1986-02-25 Itt Corporation Electrical connector for transient suppression
US4666222A (en) * 1985-10-31 1987-05-19 Allied Corporation Grounded contact connector
US4699590A (en) * 1985-10-31 1987-10-13 Amp Incorporated Modular connector assembly and filtered insert therefor
US4820174A (en) * 1986-08-06 1989-04-11 Amp Incorporated Modular connector assembly and filtered insert therefor
US4829235A (en) * 1987-04-01 1989-05-09 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Four-terminal connector for measuring resistance of a pyrotechnic initiator
US4930200A (en) * 1989-07-28 1990-06-05 Thomas & Betts Corporation Method of making an electrical filter connector
US4992061A (en) * 1989-07-28 1991-02-12 Thomas & Betts Corporation Electrical filter connector
US5112253A (en) * 1991-08-15 1992-05-12 Amphenol Corporation Arrangement for removably mounting a transient suppression or electrical filter device in an electrical connector
US5188543A (en) * 1991-08-15 1993-02-23 Amphenol Corporation Electrical connector including a removable circuit component
US5242318A (en) * 1991-06-14 1993-09-07 Filtec Filtertechnologie Fur Die Elektronikindustrie Gmbh Multipole connector for electronic signal lines
US5246387A (en) * 1989-10-12 1993-09-21 Siemens Aktiengesellschaft Filter plug connector
US5248266A (en) * 1992-09-15 1993-09-28 Itt Coporation Connector with sealed component contact
US20080299832A1 (en) * 2007-05-29 2008-12-04 Japan Aviation Electronics Industry, Limited Connector
US20120309237A1 (en) * 2011-06-03 2012-12-06 Greatbatch Ltd. Feedthrough Wire Connector for Use in a Medical Device
US9692173B2 (en) 2011-06-03 2017-06-27 Greatbatch Ltd. Feedthrough wire connector for use in a medical device
US11211741B2 (en) 2011-06-03 2021-12-28 Greatbatch Ltd. Removable terminal pin connector for an active electronics circuit board for use in an implantable medical device
US11296456B2 (en) * 2019-09-03 2022-04-05 Yazaki Corporation Electrical connector with shield shell for connecting to case
US11664163B2 (en) * 2018-06-14 2023-05-30 Knowles (UK) Ltd. Capacitor having an electrical termination

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Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521200A (en) * 1961-04-28 1970-07-21 Tdk Electronics Co Ltd Combined unit of impedance
US3289118A (en) * 1962-03-29 1966-11-29 Globe Union Inc Filter
US3329911A (en) * 1963-02-25 1967-07-04 Allen Bradley Co Low transfer impedance capacitor with resistive electrode
US3320557A (en) * 1963-04-02 1967-05-16 Globe Union Inc Feed-through capacitor
US3275953A (en) * 1963-08-20 1966-09-27 Erie Technological Prod Inc Multiple pin connector having ferrite bead-capacitor filter
US3275954A (en) * 1963-08-20 1966-09-27 Erie Technological Prod Inc Multiple connector wherein pins have limited movement within housing and each pin has integral low-pass filter
US3297969A (en) * 1964-02-12 1967-01-10 Gen Instrument Corp Low pass filter which dissipatively and reactively attenuates high frequencies
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