US3500252A - Signal splitter comprising an autotransformer having flat windings - Google Patents

Signal splitter comprising an autotransformer having flat windings Download PDF

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Publication number
US3500252A
US3500252A US701662A US3500252DA US3500252A US 3500252 A US3500252 A US 3500252A US 701662 A US701662 A US 701662A US 3500252D A US3500252D A US 3500252DA US 3500252 A US3500252 A US 3500252A
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United States
Prior art keywords
limbs
winding
autotransformer
circuit
parallel
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Expired - Lifetime
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US701662A
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English (en)
Inventor
Bastiaan Petrus Johanne Wakker
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US Philips Corp
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US Philips Corp
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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
    • H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
    • H03H7/485—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source particularly adapted as input circuit for receivers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • 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
    • H03H7/38—Impedance-matching networks
    • 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
    • H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/067—Core with two or more holes to lead through conductor

Definitions

  • a device for coupling a high-frequency voltage source to a pair of independent loads includes first and second thin flat metal winding components each having a pair of parallel limbs and a transverse leg interconnecting corresponding ends of the limbs.
  • the winding components are mounted in two parallel bores in a ferrite block from opposite sides with the limbs oppositely directed and overlapping.
  • At least one winding component has a branch extending outside of the ferrite block and electrically interconnecting the transverse legs of the two winding components.
  • This invention relates to a splitter device, especially adapted for use at the television frequency bands, for connecting a high-frequency voltage source to two identical consumer impedances which are not interconnected, by means of a coupling coil the ends of which are connected to the impedances and the centre of which is connected to a tap on an autotransformer to which the highfrequency voltage is applied.
  • a splitter device may be used, for example, in communal antenna systems, the two impedances which are not interconnected then being two consumer devices connected to the system.
  • An object of the invention is to provide a device which can be manufactured in quantity at low cost and which needs substantially no trimming after the manufacture.
  • a device according to the invention is characterized in that the winding of the coupling coil and that of the autotransformer, together with the connection between them, are combined into an assembly comprising at least two flat winding components punched from sheet material, each consisting of at least two limbs extending approximately in parallel and a transverse connecting piece connecting two corresponding ends of the limbs, at least one transverse connecting piece having an extension which reaches beyond one of the limbs.
  • FIGURE 1 shows a known circuit which underlies the device according to the invention
  • FIGURE 2 and FIGURE 3 show respectively a perspective view and a circuit which serves to explain the invention
  • FIGURE 4 shows two embodiments of the device according to the invention.
  • FIGURE 5 serves to clarify the second embodiment of FIGURE 4.
  • the known circuit shown in FIGURE 1 serves to connect a high-frequency voltage source, for example, the output circuit of the amplifier of a communal aerial system, to two identical consumer impedances 1 and 3, for example, two television receivers which are not coupled together.
  • a high-frequency voltage source for example, the output circuit of the amplifier of a communal aerial system
  • This is elIected by means of a coupling coil 7 shunted by a resistor 5.
  • the ends of the coil are connected to the impedances 1 and 3 and the center tap of the coil is connected by means of a connection 9 to a tap .on an autotransformer 11.
  • the high-frequency voltage from the voltage source represented by two connecting terminals 13 and 15, is applied to the ends of the autotransformer.
  • the currents produced by said voltage source in the two halves 17 and 19 of the coupling coil 7 are oppositely directed and the magnetic fields produced in said coil halves neutralise each other so that the impendance of the two coil halves, for the current from the voltage source, is substantially nil, and said currents are supplied to the consumer impedances 1 and 3 without attenuation, and with a suitable choice of the impedance of the consumers 1, 3 and that of resistor 5 and of the voltage source 13, 15, the coupling between the consumer impedances 1 and 3 through the coupling coil 7 and the resistor 5 is substantially negligible.
  • the autotransformer 11 in fact a tapped coilserves to match the impedance of the voltage source to the impedance of the assembly 1, 3, 5, 7.
  • FIGURE 2 shows diagrammatically the form in which the circuit of FIGURE 1 is fundamentally obtained in accordance with the invention.
  • the resistor 5, which is not an essential part of the device according to the invention, has been omitted in FIGURE 2 for the sake of clarity.
  • This figure shows that the coupling coil 7 and the autotransformer 11 each substantially comprise the straight portions 17, 19 and 21, 23, respectively, of each two turns arranged approximately in a horizontal plane.
  • the straight portions are surrounded pairwise by closed ferromagnetic circuits in the form of ferrite tubes 25 and 27, respectively.
  • the closure parts, to be described hereinafter, which form the said straight portions into complete turns, extend externally of the ferromagnetic circuits, as shown, and thus contribute very little to the inductance of the coils 7 and 11, respectively.
  • the connection 9 (see FIGURE 1) between the coils 7 and 11 could be formed by a short connecting wire in the manner shown in FIGURE 2, which connecting wire is likewise indicated by reference numeral 9 in FIGURE 2.
  • the said connection can be extended to the full length of the portions of the coils 7 and 11 indicated by three accolades 29, 31 and 33 in FIGURE 2, producing in fact the circuit shown in FIGURE 3.
  • the said extension is permissible only if all of the coils are made of sheet material so that their conductors (turns) have a comparatively great width and hence may have a low inductance per unit length.
  • the inductance of the portion 29, 31, 33 common to the two coils 7 and 11, which portion lies outside the ferromagnetic circuit is
  • Each winding component comprises at least two limbs 19, 21 and 17, 23, respectively, which extend approximately in parallel (see also FIGURE 2), and a transverse connecting piece 36 and 37, respectively, which connects two corresponding ends of the limbs 19, 21 and 17, 23, respectively.
  • At least one of the connecting pieces 36 and 37 both in the case shown, has an extension 29, 31a and 33, 31b, respectively, which extends beyond one of the limbs, in this example beyond the limbs 21 and 23, respectively (see also FIGURE 2).
  • the components 34 and 35 are placed on one another with their limbs oppositely directed and mutually insulated in such manner that the limbs 21, 23 and 17, 19, respectively, and preferably also the extensions 29, 31a and 33, 31b-which, as shown in FIGURE 4, have rectangularly bent portions 31a and 31bpartly overlap.
  • Each pair of overlapping limb portions 19, 17 and 21, 23, respectively, are surrounded by a closed ferromagnetic circuit and the overlapping portions 31a and 31b of the extensions are electrically connected together externally of the said circuit.
  • the ferromagnetic circuit is preferably in the form of a ferrite block 39 having two bores 41 and 43 into which the winding components 34 and 35 may readily be introduced from opposite sides.
  • FIG- URE 4 shows the two winding components 34 and 35 with some spacing one below the other and only the limbs 19 and 21 of the winding component 34 are shown within the bores 41 and 43.
  • the cross-hatched terminal portions of the winding components may be tin-plated and serve as soldering tongues for connection to the impedances 1 and 3 and to the voltage source 13, 15.
  • the broken line 44 indicates that the extensions 31a and 3112 are electrically connected together. All elements of the device of FIGURE 4 can readily be identified by comparison with FIGURE 2.
  • winding components 34 and 35 punched from sheet metal consists in that their shape is accurately reproducible and that the manufactured device, after assembly of the components, is fully identical with all those previously manufactured. This implies that, assuming of course that the dimensions are matched to one another in the proper way, all manufactured devices have the required predetermined properties without any subsequent processing or trimming.
  • This turn constitutes a third component punched from sheet material (also indicated by reference numeral 45 in FIGURE 4) which, as can be seen from FIGURE 4, forms a complete turn and comprises a portion which extends substantially in accordance with the two interconnected extensions 29, 31a, 31b, 33 and is connected at its free end 16 to the adjacent limb 23 of the winding component-preferably due to the two cross-hatched ends located one above the other in FIGURE 4 being soldered together, see broken line 47-and also comprises a limb 48 which substantially overlaps the adjacent limb 23.
  • the end of the voltage source which is connected to ground and represented by the connecting terminal 15, is connected to the free end of the limb 48.
  • the component 45 it may be punched in a slightly different shape, as shown in broken line in FIG- URE 4, whereafter the punched component is shaped by bending into the form shown in full line in FIGURE 4. This bending operation may readily be effected with an accuracy sufficient to fulfil the required tolerances.
  • the said parasitic capacitance may be varied by providing a strip of insulating material of a greater or smaller thickness and/or dielectric constant between the limbs 17 and 19 of the punched winding components 35 and 34.
  • the dimensions required for using the described device for the UHF- television bands are found in practice to be such that it is readily possible to tune the said oscillatory circuit to a frequency close to the highest frequency (approximately 900 mc./s.) of the UHF-region, for example, to a frequency of 800 mc./s.
  • the parasitic capacitance between the conductors 17 and 19 then occurs in a parallel resonance circuit having a very high impedance so that the parasitic capacitance cannot detrimentally affect the uncoupled state of the consumers 1 and 3.
  • the said parallel circuit is no longer in resonance, but in this case the impedance of the parasitic capacitance in itself is already sufficiently high relative to that of resistor 5 so that it prevents the uncoupled state of the consumers 1 and 3 from being alfected to any appreciable extent.
  • winding portion 29, 31, 33 can be situated to the right of the conductors 17 and 19 instead of (as shown in FIGURE 2) to the left of the conductors or limbs 21 and 23.
  • the inductance of the oscillatory circuit of which the said parasitic capacitance forms part can be even a little lower since the turn located to the right of the conductors 17 and 19 need not include the turn portions 36 and 37 (see FIG URE 2).
  • a splitter device for connecting a high-frequency voltage source to two identical non-connected load impedances by means of a coupling coil the ends of which are connected to the impedances and the center of which is connected to a tap on an autotransformer to which the high-frequency voltage is applied, said coupling coil and said autotransformer together with the connection between them comprising the following assembly: at least two flat winding components formed from sheet material, each winding component including at least two limbs extending approximately in parallel and a transverse connecting piece connecting two corresponding ends of the limbs, at least one of said transverse connecting pieces having a branch which extends beyond one of the limbs, the winding components bei g placed on one another with their limbs oppositely directed in such manner that corresponding limbs partly overlap one another, a closed ferromagnetic circuit surrounding each two overlapping limb portions, and means including said extension branch for electrically connecting together the transverse connecting pieces externally of the ferromagnetic circuit.
  • the ferromagnetic circuit comprises a ferrite block having two parallel bores through which the limbs of the winding components extend from opposite sides, and wherein the other one of said transverse connecting pieces has a branch extending beyond one of the limbs, the two extension branches being interconnected and extending externally of the ferrite block.
  • a device as claimed in claim 2 comprising a further winding component formed from sheet material so as to form one complete turn, said further winding component comprising a first limb which extends adjacent the two interconnected branch extensions of the other two winding components and having its free end connected to the adjacent limb of one of said two winding components, and a second limb which substantially overlaps the adjacent limb of said one winding component.
  • a device for coupling a high-frequency voltage source to two independent load impedances comprising, a first thin fiat metal winding component having first and second parallel limbs and a transverse leg interconnecting two corresponding ends of the limbs, a second thin fiat metal winding component having third and fourth parallel limbs and a transverse leg interconnecting two corresponding ends of the limbs, one of said winding components having a branch extension of said transverse leg that extends beyond one of the parallel limbs, said first and second winding components being positioned with said first and second limbs adjacent said third and fourth limbs, respectively, with said limbs being oppositely directed so as to partly overlap oneanother, a ferromagnetic core surrounding said overlapping limbs, means including said branch extension for connecting together the transverse legs of said first and second winding com- 6 ponents externally of the ferromagnetic core, means connecting the free ends of said first and third limbs to individual ones of said two load impedances, and means connecting the
  • branch extension comprises a thin fiat metal leg integral with said transverse leg and extending parallel thereto and a fifth limb extending perpendicularly from the free end of said integral leg and parallel to the parallel limbs, and wherein said other winding component has an identical branch extension including a sixth limb, but oppositely directed so that said fifth and sixth limbs are in alignment and electrically connected externally of the ferromagnetic core.
  • a device as claimed in claim 4 further comprising a third thin fiat metal winding component having two pairs of parallel limbs arranged to form a rectangle, said third winding component being positioned adjacent said first and second winding components so that one pair of parallel limbs thereof overlap said second and fourth limbs and a part of said branch extension, respectively, and means electrically connecting said third winding component to one of said second and fourth overlapping limbs.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US701662A 1967-02-01 1968-01-30 Signal splitter comprising an autotransformer having flat windings Expired - Lifetime US3500252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6701517A NL6701517A (ja) 1967-02-01 1967-02-01

Publications (1)

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US3500252A true US3500252A (en) 1970-03-10

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US (1) US3500252A (ja)
BE (1) BE710112A (ja)
DE (1) DE1616291C2 (ja)
ES (1) ES349926A1 (ja)
FR (1) FR1554160A (ja)
GB (1) GB1143915A (ja)
NL (2) NL6701517A (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619504A (en) * 1967-01-13 1971-11-09 Ibm Directional nonreturn to zero computer bussing system
US4538132A (en) * 1981-10-06 1985-08-27 Alps Electric Co., Ltd. Impedance converting transformer formed of conductors extending through a magnetic housing
US4789845A (en) * 1988-01-20 1988-12-06 Prabhakara Reddy Broad band hybrid signal splitter
US5220297A (en) * 1991-03-22 1993-06-15 J.E. Thomas Specialties Limited Transmission line transformer device
US5293145A (en) * 1989-09-19 1994-03-08 Onan Corporation Switch battery charger with reduced electromagnetic emission
WO2000062420A1 (en) * 1999-04-14 2000-10-19 General Instrument Corporation Rf transformer with compensation transmission line
US20030155991A1 (en) * 2002-02-19 2003-08-21 Daxiong Ji Miniature 180 degree power splitter
US20050052331A1 (en) * 2003-09-08 2005-03-10 Pds Electronics Balun for an antenna
US10998123B2 (en) * 2017-12-05 2021-05-04 Murata Manufacturing Co., Ltd. Balun and method for manufacturing same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2457522C2 (de) * 1974-12-05 1985-04-18 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zum Aufteilen von Hochfrequenzsignalenergie
DE2930190A1 (de) * 1979-07-25 1981-02-05 Siemens Ag Einrichtung zur gleichmaessigen aufteilung von hochfrequenzenergie auf zwei verbraucher
DE3425153A1 (de) * 1984-07-07 1986-01-16 Robert Bosch Gmbh, 7000 Stuttgart Elektrischer uebertrager
GB8613314D0 (en) * 1986-06-02 1986-07-09 Era Patents Ltd Microwave apparatus
FR2628584B1 (fr) * 1988-03-11 1990-11-09 Portenseigne Radiotechnique Repartiteur de puissance pour signal h.f.
AU3394195A (en) * 1994-09-06 1996-03-27 Walter Rose Gmbh & Co. Kg. Device for dividing the output of broad-band hf-signals
DE29716058U1 (de) * 1997-09-06 1997-10-23 Wollnitzke, Helmut, 95100 Selb Magnetisierbares elektrisches Bauelement
DE102005037616A1 (de) * 2005-08-09 2007-02-15 Rohde & Schwarz Gmbh & Co. Kg Leitungstransformator zur Impedanzanpassung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539928A (en) * 1922-09-02 1925-06-02 Donald J Angus Reactance
US3311850A (en) * 1964-01-31 1967-03-28 Anzac Electronics Inc Low loss hybrid connector utilizing high permeability magnetic core material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539928A (en) * 1922-09-02 1925-06-02 Donald J Angus Reactance
US3311850A (en) * 1964-01-31 1967-03-28 Anzac Electronics Inc Low loss hybrid connector utilizing high permeability magnetic core material

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619504A (en) * 1967-01-13 1971-11-09 Ibm Directional nonreturn to zero computer bussing system
US4538132A (en) * 1981-10-06 1985-08-27 Alps Electric Co., Ltd. Impedance converting transformer formed of conductors extending through a magnetic housing
US4789845A (en) * 1988-01-20 1988-12-06 Prabhakara Reddy Broad band hybrid signal splitter
US5293145A (en) * 1989-09-19 1994-03-08 Onan Corporation Switch battery charger with reduced electromagnetic emission
US5515021A (en) * 1989-09-19 1996-05-07 Onan Corporation Switching battery charger for reducing electromagnetic emussions having separately-mounted circuit boards
US5220297A (en) * 1991-03-22 1993-06-15 J.E. Thomas Specialties Limited Transmission line transformer device
WO2000062420A1 (en) * 1999-04-14 2000-10-19 General Instrument Corporation Rf transformer with compensation transmission line
US6239668B1 (en) 1999-04-14 2001-05-29 General Instrument Corporation RF balun and transformer with shunt compensation transmission line
US20030155991A1 (en) * 2002-02-19 2003-08-21 Daxiong Ji Miniature 180 degree power splitter
US6806790B2 (en) * 2002-02-19 2004-10-19 Scientific Components, Inc. Miniature 180 degree power splitter
US20050052331A1 (en) * 2003-09-08 2005-03-10 Pds Electronics Balun for an antenna
US7319435B2 (en) * 2003-09-08 2008-01-15 Pdseelectronics, Inc. Balun for an antenna
US10998123B2 (en) * 2017-12-05 2021-05-04 Murata Manufacturing Co., Ltd. Balun and method for manufacturing same

Also Published As

Publication number Publication date
GB1143915A (en) 1969-02-26
DE1616291C2 (de) 1974-05-16
NL133284C (ja)
ES349926A1 (es) 1969-04-16
BE710112A (ja) 1968-07-30
DE1616291B1 (de) 1970-04-23
NL6701517A (ja) 1968-08-02
FR1554160A (ja) 1969-01-17

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