US2583773A - Diplex antenna feed system - Google Patents

Diplex antenna feed system Download PDF

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Publication number
US2583773A
US2583773A US41628A US4162848A US2583773A US 2583773 A US2583773 A US 2583773A US 41628 A US41628 A US 41628A US 4162848 A US4162848 A US 4162848A US 2583773 A US2583773 A US 2583773A
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Prior art keywords
container
transmitter
point
points
feed
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Expired - Lifetime
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US41628A
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English (en)
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Michael E Hiehle
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General Electric Co
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General Electric Co
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Priority to BE490398D priority Critical patent/BE490398A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US41628A priority patent/US2583773A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies

Definitions

  • DIPLEX ANTENNA FEED SYSTEM I Filed July 30, 194B Inverwtor; Mitzh'ael B. Hiehle,
  • H Attorrwey referretl to as diplexers.
  • the diplexers embodying this invention operate on the principle ofsimultaneously feeding energy from two transmitters to a common load through anintermedi'ate circuit. Briefly, energy from one transmitter is fed, in a push-pull relationship, to two utilization points, While that from theother transmitter is fed, in a parallel relationship, through the midpoint or a half wavelength loop connecting the utilization points. By proper selection of the characteristic impedances of the sections, both transmitters may feed into the same. load and yet remain completely decoupled. These principles are well known in the art and will not he described indetail. My invention resides in certain improved constructional features of the diplexer assembly, and more particularly in "the utilization of the outside sheaths ofsingle coaxial transmission lines to perform functions separatefrom thoseof the inside conductors.
  • Oneiof 'the objects of the present inven'tion'is toi provide a new and-improved diplexer to enable twortransmitterS, operating at different. frequencies, tofeed'simultaneously to the same antenna, in such a manner that there is no reaction between the transmitters over a wide range of fre- 'quencies.
  • a further object of this invention is to provide a'new and improved diplexer for guiding energy from a pair of'transmitters to apair of antennae through single concentric transmission lines in such a manner that there is no reaction between
  • Fig. l is a perspective view of adiplexer embodying my invention, with part of its container cut away to facilitate understanding of itsinternal arrangement
  • Fig. 21 similarly shows another diplexer embodying my in-.- vention in modified form
  • Fig. 3 shows a modification of the diplexer of Fig.1.
  • the symbol refers to a quarter wavelength at'the operating frequency of the visual transmitter, while the symbol branches at a.point 3l from whence. two concentric lines .3f3 ,and 34 feed energy into the system-
  • the transmission-lineli is adaptedto be energized from aneural televisionttransmitter at. the aural input point 4.. .They parallel branches are terminated at theright end wall of. a. conductive container 10, and the branches and .34 are of such length thattogether they .form
  • Two concentric transmission lines 24' and'lli withinner conductor 23 and 2"5" also terminate in the right' end wall ofthe container.
  • For the-purpose of obtaining a phase I quadrature relationship in the cutputof one'antenna'with respect to the "output of the-othenaloop 21 is introducedin the concentric line 26.
  • This”loop isa quarter oi 'a wavelength long-attire mean-operating frequency of the system, taking into account the frequencies of hoth' the "visual and aural transmitters.
  • the linesections H and: It: within: container I'D are: arranged to provide: two intermediate :points 1 and 8 f fromwhich energy. from the visual transjvoltage relations at these points.
  • sheath I3 at the left end wall of the container it I is curved at this wall to join the outer sheath I I, and its left section is actually a concentric line containing .an inner conductor I4 which is connected to the visual input line at a point I6.
  • a shorting plug I5 provides a conductive connection between the inner conductor I4 and the sheath I 3.
  • the section of transmission line from point I8 to the shorting plug considered solely as a concentric line and without reference to the function of the outer sheath in the container,
  • the container I0 surrounding sheath II, isolates it from ground at the operating frequency so that the voltage between the inner conductor I2 and sheath II is approximately balanced to ground at the intermediate point 1.
  • the inner conductor I2 of the .visual input line is connected by a short conductive link 2
  • These sheaths II and I3 together constitute a two-wire transmission line.
  • a shorting bar 22, for which a capacitance may be substituted incertain cases, is mounted so that it can he slid over the sheaths II and I3 so as-to adjust their electrical length.
  • the sliding 'bar is normally adjusted so that the quarter wave stub constituted by sheaths I I and I3 constitutes a very high impedance at the visual input frequency, as seen from points I and 8.
  • Two pairs of capacitor plates and 36, mounted at the free 'ends of sheaths I I and I3, provide additional flumped capacity to broaden the aural frequency bandwidth of the system and to insure electrical Since the Accordir'ig'ly, if the terminals are connected to two points carrying out-of-phase voltages, such as points I and 8, there will be no disturbance of the Moreover. such voltages applied at the input terminals arrive at the junction point 3
  • the length of the conducting path is close enough to a quarter wavelength at the operating frequency of the aural transmitter so as to ofler a comparatively high impedance between points I and 8 in parallel, to the boundary of the container. Accordingly the voltage from the aural input line exists between points I and 8 in parallel and the container boundary. This voltage cannot affect the visual transmitter, because the same voltage exists on point I as on point 8 and hence there can be no difierence of potential between point I and the inner conductor I2 of the visual input line at the aural frequency.
  • the visual transmitter supplies voltages to points I and 8 in a push-pull relationship and yet remains completely decoupled from the aural transmitter.
  • a pair of short connectors I1 and I8 couple the voltages existing at points, I and 8 to the inner conductors 23 and 25 of the antenna output lines.
  • the antenna output lines are thus supplied with voltages in a push-pull relationship from the visual transmitter and in a parallel relationship from the aural transmitter.
  • An external quarter wavelengthloop in theconcentric line 26 provides a phase retardation of in that line so that the voltages arrive at the antennae in phase quadrature.
  • Fig. 1 The arrangement of Fig. 1, as thus far described, has the advantage of utilizing single concentric lines to perform all the functions required in the diplexer.
  • tainer perform multiple functions: as a concentric matching stub, considering the inner section of line I3 from point I6 to shorting plug I5; as atwo-wire transmission line, considering sheaths I I and I3 as a pair of linear conductors; and
  • the parallel branches are terminated at the right end wall'of a rectangular conductive container 45, and "they are of such length, that together they .form a loop one-half wavelength long at the mean.operating frequency of the visual transmitter.
  • Two concentric lines 46 and 48 enter the container through the left" end wall and .terminate at points 11 and 18 at a distance from the left end wall, of approximately one-quarter of a wavelength at the operating frequency of the visual transmitter.
  • the inner conductors 41 The lines inside the con single concentric lines.
  • the outer sheathiil and dummy sheath 52 form elements of an openwire transmission line section, shorted at its left end-by means of adjustable shorting straps 51.
  • the pairs of sheaths are excited inpushpull from the visual input and in parallel from the aural input.
  • This diplexer is intended to operate at a higher frequency than that of Fig. l and it has been found expedient to neutralize the inductance inherently present in the connecting link 55, by means of a series capacitance.
  • This inductance is shown in dotted outline in Fig. 2.
  • the neutralization is effected by running an inner conductor 53 into the dummy sheath 52.
  • the short length of inner conductor 53 into sheath 52 can be considered as an open-ended transmission line and accordingly provides a capacitance whose value can be altered by adenergy.
  • a small coil is connected between link 56 and the right end wall of the container and is chosen *to provide parallel resonance in conjunction with the stray capacity.
  • the inner conductors of the antenna output lines are connected directly to the right wall of the grounded container, the voltages existing on the outer sheaths at points 11 and 18 are transferred to the inner conductor through the length of the quarter wave section going to the left wall of the tube. Thence the output voltages are transmitted to the antenna through regular A quarter wave loop 65 is introduced in one of the lines to provide a quadrature relationship in the voltages at the antenna.
  • the construction shown in the embodiment of Fig. 2 also has the advantage of using ordinary "concentric lines to perform all the necessary functions.
  • the inversion of the feed to the antenna by the grounding of the inner conductors inside the tube has the advantage of more easily achieving the low impedance match required.
  • Fig. 3 shows a modification of the diplexer of Fig. 1 in which the inherent inductance of the connecting link 2! is neutralized in the same This is tion of this modification are the same as for the diplexer of Fig. 1.
  • Adiplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall ofsaid container approximately an odd multiple of a quarter-wavelength at the operating frequency of said first transmitter, said outer sheath being connected to said wall of said container at its point of entrance and having a free end within said container constituting a first feed point, a linear-conductor in said container substantially parallel to said portion, said linear conductor having one end connected to said wall adjacent said point of entrance and having a free end forming a second feed point adjacent said first feed point, said outer sheath and linear conductor together forming an open-wire transmission line section, means comprising an adjustable shorting member bridging said section for independently adjusting the efiective length of said section atthe operating frequency of said first transmitter, circuit connections for supplying wave energy
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall of said container approximately an odd multipleoi a quarter-wavelengthat the operating frequency of said first transmitter, said outer sheath being connected to said Wall of said container at its point of entrance and having a free end within said container constituting a first feed point, a conductive tube in said container, said tube having an unsupported section extending substantially parallel to said portion and a bent end section conductively connected to said sheath near said point'of entrance soas to form a branch sheath, an inner wire within said tube joined at one end to the inner conductor of said line and at the other end to an adjustable short-circuiting member' Within said tube, whereby said tubeencloses a concentric impedance-matching stub for
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line'having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall of said container approximately an odd multiple of a quarter-wavelength at the operating frequency of said first transmitter, said outer sheath being connected to said wall of said container at its point of entrance and having a free end within'said container constituting a first feed point, a conductive tube positioned in said container substantially parallel to said portion, said tube being conductively supported only at one end at said wall adjacent said point of entrance and providing a second feed point at its free end adjacent said first feed point, a linear conductor positioned within the free end of said tube and having a direct connection to said inner conductor, said linear conductor penetrating said tube a sufficient distance to provide a capacity reactance substantially resonating with series inductive reactance inherent
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a'concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall of said container approximately an odd multiple of a quarter-wavelength at the operating frequency of said first transmitter, said outer sheath being connected to said wall of said container at its pointof entrance and having a free end within said container constituting a first feed point, a conductive tube positioned in said container substantially parallel to said portion, said tube being conductively supported only at one end at said wall adjacent said point of entrance and providing a second feed point at its free end adjacent said first feed point, a linear conductor positioned within the free end of said tube and having a direct connection to said inner conductor, said linear conductor penetrating said tube a sufiicient distance to provide a capacity reactance substantially resonating with series inductive reactance
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall of said container approximately an odd multiple of a quarter-wavelength at the operating frequency of said first transmitter, said outer sheathbeing connected to said wall of said container at its point of entrance and having a free end within said container constituting a first feed point, a conductive tube in said container, said tube having a straight unsupported section extending substantially parallel to said portion and a bent end section conductively connected to said sheath near said point of entrance so as to form a branch sheath, said outer sheath and said tube together forming an open wire transmission line section means comprising a shortthe free end of said tube and having a directconnection to said inner conductor, said linear conductor penetrating said tube a sufiicient distance
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a wall of said container approximately an odd multiple of a quarter-wavelength at the operating frequency of .said first transmitter, said outer sheath being connected to said wall of said container at its point of entrance and having a free end within said container constituting a first feed point,
  • said means comprising a pair of unbalanced transmission line sections energized in parallel, said line sections each having a length substantially equal to an odd number of quarter-wavelengths at the operating frequency of said first transmitter, and a pair of transmission lines energized from said respective feed points for supplying energy from said points to said pair of load circuits.
  • a diplexer structure for supplying electrical wave energy to a common pair of load circuits from two separate high-frequency transmitters, comprising a closed conductive container, a concentric transmission line having an inner conductor and an outer sheath energized from a first one of said transmitters, said line having an end portion penetrating a Wall of said container approximately an odd multiple of a quarter-wavelength at the operating frequency of said first transmitter, said outer sheath being connected to said wall of said container at its point of entrance and having a free end within said container constituting a first feed point, a
  • linear conductor positioned in said container substantially parallel to said sheath, said linear conductor being electrically connected to said container near said point of entrance and having a free end forming a second feed point adjacent said first feed point, means electrically con necting the inner end of said inner conductor the free end of said linear conductor to maintain them at the same potential at said frequency, said outer sheath and linear conductor together forming an open wire transmission line section.
  • means comprising a shorting member bridging said section for independently determining the effective length of said section at the operating frequency of said first transmitter, said feed points being energized in opposite phase from said first transmitter, means for energizing said feed points in the same phase from said second transmitter, and a pair of transmission lines energized from said respective feed points for supplying energy from said points to said pair of load circuits.

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  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US41628A 1948-07-30 1948-07-30 Diplex antenna feed system Expired - Lifetime US2583773A (en)

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BE490398D BE490398A (en(2012)) 1948-07-30
US41628A US2583773A (en) 1948-07-30 1948-07-30 Diplex antenna feed system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661424A (en) * 1951-01-22 1953-12-01 Rca Corp Diplexer arrangement
US2903653A (en) * 1955-02-09 1959-09-08 Rodney E Grantham Broad-band hybrid junction
US3497832A (en) * 1967-08-24 1970-02-24 Emerson Electric Co Radio frequency transmission line tee hybrid
US20130050047A1 (en) * 2009-08-05 2013-02-28 William N. Carr RFID antenna with asymmetrical structure and method of making same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318237A (en) * 1940-06-08 1943-05-04 Rca Corp Antenna feed system
US2473328A (en) * 1944-12-19 1949-06-14 Rca Corp Line balance converter
US2495589A (en) * 1947-07-21 1950-01-24 Rca Corp Radio frequency transmission network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318237A (en) * 1940-06-08 1943-05-04 Rca Corp Antenna feed system
US2473328A (en) * 1944-12-19 1949-06-14 Rca Corp Line balance converter
US2495589A (en) * 1947-07-21 1950-01-24 Rca Corp Radio frequency transmission network

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661424A (en) * 1951-01-22 1953-12-01 Rca Corp Diplexer arrangement
US2903653A (en) * 1955-02-09 1959-09-08 Rodney E Grantham Broad-band hybrid junction
US3497832A (en) * 1967-08-24 1970-02-24 Emerson Electric Co Radio frequency transmission line tee hybrid
US20130050047A1 (en) * 2009-08-05 2013-02-28 William N. Carr RFID antenna with asymmetrical structure and method of making same
US8581793B2 (en) * 2009-08-05 2013-11-12 William N. Carr RFID antenna with asymmetrical structure and method of making same

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