US1778395A - Coupling device - Google Patents

Coupling device Download PDF

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Publication number
US1778395A
US1778395A US264132A US26413228A US1778395A US 1778395 A US1778395 A US 1778395A US 264132 A US264132 A US 264132A US 26413228 A US26413228 A US 26413228A US 1778395 A US1778395 A US 1778395A
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United States
Prior art keywords
lines
line
impedance
oscillator
points
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
US264132A
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English (en)
Inventor
Nils E Lindenblad
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RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Priority to NL30417D priority Critical patent/NL30417C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US264132A priority patent/US1778395A/en
Priority to DER77483D priority patent/DE495354C/de
Priority to GB9621/29A priority patent/GB308664A/en
Application granted granted Critical
Publication of US1778395A publication Critical patent/US1778395A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling

Definitions

  • This invention relates to coupling devices, and more particularly to a method and means for so coupling circuits having different impedances that their impedances are matched.
  • I couple the lines to be matched symmetrically to a linear oscillator. and so space the points of coupling of each of the lines to the oscillator that the desired impedance between the points of coupling is obtained.
  • This arrangement is exceedinglv simple. comprising merely a piece of conductor arm ranged transversely of the line. but it. tends to radiate energy. and to overcome this ditli cultv is a further object of mv invention. which I fulfill by bending the oscillator in the direction of the line. or in the case of an ungrounded oscillator. in bifilar form. which effectively prevents radiation.
  • the impedance matching device may be left exposed without serious effect, but to avoid even the slight detuning which might be caused by considerable formation of sleet I provide the oscillator itself forsleet melting.
  • I utilize two linear oscillators connected at their ends or current nodal points, and each having a blocking condenser at the center or the potential nodal point, so that the oscillators are connected in parallel with respect to the high frequency energy, and in series with respect to the sleet melting current.
  • One of the transmission lines is synnnetically coupled directly to one of the oscillators at points so spaced that the impedance therebetween matches the impedance of the line coupled thereto.
  • each half of the oscillator is made like a hairpin. so that the. sleet melting current flows up and back in each half of the oscillator.
  • a further object of my invention is to make the device self-supporting under tension when connected directlv in the line. It has already been mentioned that to prevent radiation the oscillator is bent in bifilar form. lVith two oscillators such as has been described to provide for sleet melting the oscillators may be bent into bifilar form in opposite directions. and the U shaped portions connected end to end.
  • the impedance matching device consists simply of an insulated section of transmission line directly tensioned between the lines which are to be coupled together through four tension insulators. with means including blocking condensers connecting the two lines of the insulated section of line together at their ends. the length of the insulated or closed trap circuit being suitable to resonate the energy being carried on the lines. and
  • FIG. 6 shows my invention in preferred form
  • Figure 7 is a modification applied to a single wire transmission line.
  • a line 2- -4 which is to be coupled to another line 6-8, of different natural impedance.
  • This difference may be caused by a difference in dimension, or by reason of several lines join-
  • a simple linear oscillator such as the wire 10 approximately a half wave long or tuned to the frequency of the energy being carried on the lines, is positioned transversely of the lines, and the latterare each coupled to the oscillator at points symmetrically located with respect to its mid-point, and so spaced that the impedance between the points of coupling of the lines 2-4 matches the impedance of the line 24, while the impedance between the points of coupling of the line 6-8 matches the impedance of the line 68.
  • a blocking condenser may be provided at the potential node or midpoint of the oscillator, as is indicated by the blocking condenser at the mid-point of the oscillator 10 in Figure 2.
  • the oscillator may itself be provided for sleet melting by slight additional complication, as in the arrangement indicated in Figure 2,'in which the linear oscillator 10 is connected in parallel, with respect to the high frequency energy, with another similar linear oscillator 20, the two being joined at their ends or cur- .rent nodal points, and each being provided connected in series, and are therefore heated by the sleet melting current.
  • the center portion where no. melting takes place is at low potential, and chan es in c pacitance there have little or no e ect on t e tuning.
  • the arrangement shown in Figures 1 and 2 radiate energy, and to overcome this the arrangement shown in Figure 1 may be rearranged as in Figure 3, the oscillator being bent in bifilar form, so that it is substantially non-radiating.
  • the oscillator in order to be an electrical half wave in length, may have to be slightly different from a half wave in physical length, but the true requirement is, of course, that it should be in tune with the wave being carried by the line. 7
  • the arrangement shown in Figure 3 may be provided for sleet melting, like the arrangement shown in Figure 2, by bending the double oscillator, as has been indicated in Figure 4.
  • the impedance matching device is an insulated section of line 40, of variable effective length, which is directly tensioned between the lines 24 and the lines 68, which may be a branched line, as shown, through-tension insulators 22, 24, 26 and 28.
  • the two wires of the insulated section 40 are connectedtogether at their ends by short pieces of conductor 42 and 44, which are overlapped and electrically separated to form the blocking condensers 30.
  • the electrical length of the insulated circuit is preferably two half waves, but may be a greater number, to form a trap circuit which resonates the energy being carried by the lines.
  • portion 10, 42, 30, 42, 10, and the portion 20, 44, 30, 44, 20, are respectively equivalent to the oscillators 10 and 20 in any of Figures 2, 4 and 5.
  • the line 24 is connected to the oscillator 10 by the jumpers 32 and 34, the points of connection of the jumpers 32 and 34 to the lines 1010 being so adjusted by movement of the connectors that the impedance of the oscillator 10 between the points of connection matches the impedance of the line 2-4.
  • the line 6-8 is connected to the oscillator 20 by jumpers 36 and 38, the points of connection of which are so chosen by movement of the connectors 52'that the impedance therebe tween matches the impedance of the line 68.
  • Either or both of the cross connections are made movable, as is indicated by the dotted position of the cross connection 42 at 62, in order to tune the trap circuit.
  • the upper half may be used to match impedances when employing a single wire transmission line, as is illustrated in Figure 7.
  • the oscillators 10 and 20 in this case are preferably quarter wave oscillators. but extra half waves of line may be inserted between the insulators 22 and 26 without deleterious effect other than to increase the length of conductor in which circulating currents flow.
  • An arrangement for matching line impedances comprising input and output lines to be matched and a linear oscillator each of said lines being directly symmetrically coupled to the oscillator at points so spaced that the desired impedance therebetween is obtained.
  • An arrangement for matching line impedances comprising input and output lines to be matched and a linear oscillator a half wave long. each of said lines being directly symmetrically coupled to the oscillator at points so spaced that the desired impedance therebetween is obtained.
  • a sleet melting arrangement for matching line impedances comprising the lines to be matched, a plurality of linear oscillators each a half wave long connected at their current nodal points so as to be in parallel for the high frequency current and in series i for the sleet melting current, blocking condensers inserted at the potential nodal points of the oscillators.
  • one of said lines being directly symmetrically coupled to one of the oscillators at points so spaced that the impedance therebetween equals the impedance of the line coupled thereto and the other of said lines being directly symmetrically coupled to another of said oscillators at points so spaced that the impedance therebetween matches the impedance of the line coupled thereto.
  • a non-radiating arrangement for matching line impedances comprising the lines to be matched, a linear oscillator bent in bifilar relation and of proper length to tune to the frequency of the energy being carried by the lines, each of said lines being directly symmetrically coupled to the oscillator at points so spaced that the desired impedance therebetween is obtained.
  • a non radiating arrangement for matching line impedances provided for sleet melting comprising the lines to be matched, a plurality of linear oscillators bent in bifilar relation and connected together at their ends, each being proper in length to tune to the frequency of the energy being carried by the lines, blocking condensers inserted at the potential nodal points of the oscillators, one of said lines being directly symmetrically coupled to one of said oscillators at points so spaced that the impedance therebetween matches that of the line coupled thereto, and the other of said lines being directly sym metrically coupled to another of the oscillators at points so spaced that the impedance therebetween matches the impedance of the line coupled thereto.
  • a non radiating arrangement for matching line impedances provided for sleet melting comprising the lines to be matched, a plurality of linear oscillators bent in bifilar relation in opposite directions, and connected together at their ends, each being proper in length to tune to the frequency of the energy being carried by the lines, blocking condensers inserted at the potential nodal points of the oscillators, one of said lines being directly symmetrically coupled to one of said oscillators at points so spaced that the impedance therebetween matches that of the line coupled thereto, and the other of said lines being symmetrically coupled to another of the oscillators at points so spaced that the impedance therebetween matches the impedance of the lines coupled thereto.
  • An arrangement for matching line impedance comprising an insulated section of line tensioned between the lines to be matched thru tension insulators, means connecting the insulated section of line at its ends to resonate the energy being connected by the line, and jumpers coupling each line outside the insulator to the line inside the insulator at points so chosen that the impedances of the lines are matched.
  • An arrangement for matching line impedance comprising an insulated section of line tensioned between the lines to be matched through tension insulators, means including blocking condensers connecting the two lines of the insulated section of line together at their ends, the length of the insulated trap circuit thus formed being proper to resonate the energy being carried by the lines, and jumpers coupling each of the lines outside the insulator to the trap circuit inside the insulators at points so spaced that the impedance therebetween matches the impedance of the line connected thereto.
  • An arrangement for matching line impedances com rising an insulated section of line tensioned tween the lines to be matched through tension insulators, means including blockin condensers connecting the two lines of the insulated section of line together at their ends, the len h of the insulated trap circuit thus forme being an electrical wave in length for the energy being carried by the lines, and jumpers coupling each of the lines outside the insulator to the trap circuit inside the insulators at points so spaced that the impedance therebetween matches the impedance of the line connected thereto.

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Transmitters (AREA)
US264132A 1928-03-23 1928-03-23 Coupling device Expired - Lifetime US1778395A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL30417D NL30417C (da) 1928-03-23
US264132A US1778395A (en) 1928-03-23 1928-03-23 Coupling device
DER77483D DE495354C (de) 1928-03-23 1929-03-14 Verfahren, um elektrische Schwingungskreise von verschiedenen Impedanzen so zu koppeln, dass ihre Impedanzen aneinander angepasst werden
GB9621/29A GB308664A (en) 1928-03-23 1929-03-25 Improvements in or relating to impedance matching devices suitable for use in high frequency transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US264132A US1778395A (en) 1928-03-23 1928-03-23 Coupling device

Publications (1)

Publication Number Publication Date
US1778395A true US1778395A (en) 1930-10-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US264132A Expired - Lifetime US1778395A (en) 1928-03-23 1928-03-23 Coupling device

Country Status (4)

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US (1) US1778395A (da)
DE (1) DE495354C (da)
GB (1) GB308664A (da)
NL (1) NL30417C (da)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530329A (en) * 1947-04-24 1950-11-14 Motorola Inc Television receiver antenna input circuit
US2705737A (en) * 1951-01-09 1955-04-05 Brueckmann Helmut Transmission line support
US2765444A (en) * 1950-06-02 1956-10-02 Marconi Wireless Telegraph Co High frequency circuit arrangements
EP0037413A1 (en) * 1979-10-11 1981-10-14 Western Electric Co TRIPLE LINE TUNING.
US4999642A (en) * 1988-03-01 1991-03-12 Wells Donald H Transmission line coupling device with closed impedance matching loop
US5083136A (en) * 1989-11-16 1992-01-21 Wells Donald H Transmission line coupling device with closed impedance matching loop
US5463405A (en) * 1994-05-20 1995-10-31 Valor Enterprises, Inc. Cellular telephone coupling network

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530329A (en) * 1947-04-24 1950-11-14 Motorola Inc Television receiver antenna input circuit
US2765444A (en) * 1950-06-02 1956-10-02 Marconi Wireless Telegraph Co High frequency circuit arrangements
US2705737A (en) * 1951-01-09 1955-04-05 Brueckmann Helmut Transmission line support
EP0037413A1 (en) * 1979-10-11 1981-10-14 Western Electric Co TRIPLE LINE TUNING.
EP0037413A4 (en) * 1979-10-11 1982-01-26 Western Electric Co TRIPLE LINE TUNING.
US4999642A (en) * 1988-03-01 1991-03-12 Wells Donald H Transmission line coupling device with closed impedance matching loop
US5083136A (en) * 1989-11-16 1992-01-21 Wells Donald H Transmission line coupling device with closed impedance matching loop
US5463405A (en) * 1994-05-20 1995-10-31 Valor Enterprises, Inc. Cellular telephone coupling network

Also Published As

Publication number Publication date
GB308664A (en) 1930-01-30
NL30417C (da)
DE495354C (de) 1930-04-07

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