US3131367A - Variable phase shift selector - Google Patents

Variable phase shift selector Download PDF

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Publication number
US3131367A
US3131367A US207169A US20716962A US3131367A US 3131367 A US3131367 A US 3131367A US 207169 A US207169 A US 207169A US 20716962 A US20716962 A US 20716962A US 3131367 A US3131367 A US 3131367A
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phase shift
transmission line
switch
connector
selector
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US207169A
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Fred T Pitts
Tommy S Weaver
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/18—Phase-shifters
    • H01P1/185—Phase-shifters using a diode or a gas filled discharge tube

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  • the present invention relates to a phase shifter selector and more particularly to a Variable phase shifter selector that will rapidly select or 180 relative phase.
  • Another object of the present invention is to provide an improved selector for selecting either 0 or 180 degrees relative phase shift -of a transmitted signal wave.
  • Still another object of the present invention is to provide a relative phase shift selector that has an extremely fast switching time.
  • FIGURE 1 is a diagrammatic View of one type of phase shift selector
  • FIGURE 2 is a diagrammatic view of a preferred embodiment of t-he present invention.
  • FIGURE 3 is an isometric view of a preferred embodiment of the present invention.
  • FIG- URE 1 a power divider 11 having an input line 12 and two transmission lines 13 and 14 connected thereto.
  • Transmission line 14 is an integral number of half wavelengths (180 electrical degrees) longer than transmission line 13.
  • Isolators 15 and 16 are provided in lines 13 and 14, respectively.
  • switches 17 and 18 are provided in lines 13 and 14, as shown, and the two transmission lines are connected to a single output line 19.
  • FIGURES 2 and 3 of the drawing show a preferred embodiment of the present invention
  • Connectors 21 and 22 might be of the coaxial type, and are supported by a suitable frame or housing 25.
  • Transmission lines 23 and 24 are supported by suitable cross-braces 26 and 27, which can be secured to frame 25.
  • Switches 28 and 29 are provided in transmission lines 23 and 24, respectively.
  • switch 28 might be comprised of crystal diodes 31 and 32 which are connected to a bias pulse source through connector 33; and likewise switch 29 might be comprised of crystals diodes 34 and 35 that are connected to a bias pulse source through connector 36.
  • the distance between input connector 21 and switch 28 is equal to an integral number of half wavelengths, and the distance between input connector 21 and switch 29 is one half wavelength longer than the distance between input connector 21 and switch 28.
  • a trimmer bar 37 is provided near transmission line 24, and this bar 37 is threadedly engaged with shaft 38 that is provided with a knob 39.
  • Trimmer bar 37 is provided with a pair of feet 41 and 42 that slidably engage with transmission line 24 in order to prevent rotation of trimmer bar 37 when knob 39 is rotated.
  • the diodes in switches 28 and 29 are polarized such that the application of a bias pulse at a common point Will energize one switch. That is, a bias pulse applied at connector 33 will energize diodes 31 and 32 and a bias pulse applied at connector 36 will energize diodes 34 and 35. Direct current returns for the diodes consist of quarter wavelength short circuits which are assembled into the input and output connectors.
  • the present invention provides an improved phase shifter selector that will rapidly select one of two relative phases.
  • a variable phase shift selector comprising: an input connector, an output connector, a first transmission line of predetermined length, a second transmission line having a length which is a half wavelength longer than the length of said first transmission line, i rst and second crystal diode switches connected one each in each said transmission line, said first crystal diode switch being connected an integral number of wavelengths from said input connector and said second switch being connected an integral number ⁇ of References Cited in the le of this patent UNITED STATES PATENTS Dicke May 15, 1955 Wright et al, Apr. 22, 1958 Arditi Sept. 30, 1958 speakg et al. Aug. 30, 1960 Pan Sept. 6, 1960 Pritchard July 4, 1961 Ring May 1, 1962

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Description

April 28, 1964 F. T. PITTs ETAL VARIABLE PHASE SHIFT SELECTOR Filed June 29, 1962 United States Patent Office 3,131,367 Patented Apr. 28, 1964 3,131,367 VARIABLE PHASE SHIFT SELECTOR Fred T. Pitts, Rockville, and Tommy S. Weaver, Arnold, Md., assignors, by mesne assignments, to the United States of America as represented by the Secretary of the Navy Filed .Tune 29, 1962, Ser. No. 207,169 1 Claim. (Cl. 333-31) The present invention relates to a phase shifter selector and more particularly to a Variable phase shifter selector that will rapidly select or 180 relative phase.
Various devices and schemes have been employed in the past for selecting a relative phase shift of a transmitted signal wave. In one method, the input power is divided equally into two lines, one of which is an integral number of half wavelengths (180 electrical degrees) longer than the other. The appropriate shift of either 0 or 180 electrical degrees is accomplished by means of switches, one of which is in each line. This method, however, has several inherent disadvantages. For one thing, there is considerable power loss in such a device, and also, the use of isolators is required. Furthermore, there is considerable difficulty in achieving phase accuracy.
In the present invention, a pair of transmission lines are provided between an input connector and an output connector with one transmission line being a half wavelength longer than the length of the other transmission line. A diode switch is provided in each transmission line and the lengths of each line between the input connector and the diodes are integral numbers of half wavelengths. Thus each switch, when off, will present an open circuit at the input point and thus not introduce any shunt reactance on the selected line. Therefore, it is possible to eliminate the power divider and the isolators. In order to avoid extremely close tolerances on the mechanical parts of the selector, the phase shifter selector is made variable by providing a movable trimmer bar for one of the transmission lines.
It is therefore a general object of the present invention to provide an improved phase .shift selector.
Another object of the present invention is to provide an improved selector for selecting either 0 or 180 degrees relative phase shift -of a transmitted signal wave.
Still another object of the present invention is to provide a relative phase shift selector that has an extremely fast switching time.
Yet another object of the present invention is to provide an improved phase shifter that is simple to manufacture and has a minimum number of parts.
Other objects and advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing in which like reference numerals designate like parts throughout the figures thereof and where- 1n:
FIGURE 1 is a diagrammatic View of one type of phase shift selector;
FIGURE 2 is a diagrammatic view of a preferred embodiment of t-he present invention; and
FIGURE 3 is an isometric view of a preferred embodiment of the present invention.
Referring now to the drawing, there is shown in FIG- URE 1, a power divider 11 having an input line 12 and two transmission lines 13 and 14 connected thereto. Transmission line 14 is an integral number of half wavelengths (180 electrical degrees) longer than transmission line 13. Isolators 15 and 16 are provided in lines 13 and 14, respectively. Also, switches 17 and 18 are provided in lines 13 and 14, as shown, and the two transmission lines are connected to a single output line 19.
In operation of the embodiment shown in FIGURE 1 of the drawing, input power is divided equally by the power divider 11 into each of the transmission lines 13 and 14. With switch 18 in the open position and switch 17 in a closed position, the power being transmitted through transmission line 13 has a relative phase shift of zero degrees at the output line 19. When it is desired to provide a relative phase shift of degrees, switch 17 is opened and switch 18 is closed, and the input power is transmitted from power divider 11 through transmission line 14 to output line 19.
Referring now to FIGURES 2 and 3 of the drawing, which show a preferred embodiment of the present invention, there is shown an input connector 21 and an output connector 22 to which transmission lines 23 and 24 are connected. Connectors 21 and 22 might be of the coaxial type, and are supported by a suitable frame or housing 25. Transmission lines 23 and 24 are supported by suitable cross-braces 26 and 27, which can be secured to frame 25. Switches 28 and 29 are provided in transmission lines 23 and 24, respectively. By Way of example, switch 28 might be comprised of crystal diodes 31 and 32 which are connected to a bias pulse source through connector 33; and likewise switch 29 might be comprised of crystals diodes 34 and 35 that are connected to a bias pulse source through connector 36. As shown in FIGURE 2 of the drawings, the distance between input connector 21 and switch 28 is equal to an integral number of half wavelengths, and the distance between input connector 21 and switch 29 is one half wavelength longer than the distance between input connector 21 and switch 28. A trimmer bar 37, of suitable metal, is provided near transmission line 24, and this bar 37 is threadedly engaged with shaft 38 that is provided with a knob 39. Trimmer bar 37 is provided with a pair of feet 41 and 42 that slidably engage with transmission line 24 in order to prevent rotation of trimmer bar 37 when knob 39 is rotated.
In operation of the embodiment shown in FIGURES 2 and 3 of the drawing, when switch 28 is in a closed position and switch 29 is in an open position, an input signal wave at input connector 21 will be transmitted through transmission line 23 to output connector 22. The transmitted signal will have a relative phase shift of zero degrees. When it is desired to provide a relative phase shift of 180 degrees, switch 28 is opened and switch 29 is closed, and the input signal is transmitted from input connector 21 through transmission line 24 to output connector 22. As the accuracy of the phase shift is a function of the length of transmission line 24, trimmer bar 37 is provided to adjust the effective lengt-h of transmission line. As handwheel 39 is rotated and trimmer bar 37 is moved nearer to transmission line 23, the effective length of transmission line 23 is shortened, and likewise, when trimmer bar 37 is moved away from transmission line 37 the effective length of transmission line 23 is lengthened.
The diodes in switches 28 and 29 are polarized such that the application of a bias pulse at a common point Will energize one switch. That is, a bias pulse applied at connector 33 will energize diodes 31 and 32 and a bias pulse applied at connector 36 will energize diodes 34 and 35. Direct current returns for the diodes consist of quarter wavelength short circuits which are assembled into the input and output connectors.
It can thus be seen that the present invention provides an improved phase shifter selector that will rapidly select one of two relative phases.
While there has been described a preferred embodiment of the present invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention and it is to be understood, that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
What is claimed is: A variable phase shift selector comprising: an input connector, an output connector, a first transmission line of predetermined length, a second transmission line having a length which is a half wavelength longer than the length of said first transmission line, i rst and second crystal diode switches connected one each in each said transmission line, said first crystal diode switch being connected an integral number of wavelengths from said input connector and said second switch being connected an integral number `of References Cited in the le of this patent UNITED STATES PATENTS Dicke May 15, 1955 Wright et al, Apr. 22, 1958 Arditi Sept. 30, 1958 Grieg et al. Aug. 30, 1960 Pan Sept. 6, 1960 Pritchard July 4, 1961 Ring May 1, 1962
US207169A 1962-06-29 1962-06-29 Variable phase shift selector Expired - Lifetime US3131367A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192530A (en) * 1962-10-24 1965-06-29 Bernard I Small Electronically scanned array with diode controlled delay network
US3317860A (en) * 1964-04-20 1967-05-02 Robert V Garver Diode limiter
US3346822A (en) * 1963-02-15 1967-10-10 Cubic Corp Hybrid ring structure for reversing the phase of an rf signal in accordance with the level of a two-voltage level signal producing means
US3387217A (en) * 1966-04-08 1968-06-04 Air Force Usa Phase detector
US3445772A (en) * 1965-09-22 1969-05-20 Hughes Aircraft Co Rf phase shift power coder
US3471808A (en) * 1966-06-09 1969-10-07 Itt Phase shifter having different length conductors inserted into circuit by reed relays
US3638032A (en) * 1970-02-04 1972-01-25 Atomic Energy Commission Fast-acting magnetic switching device for high-level electrical signals and diverter incorporating same
US4001734A (en) * 1975-10-23 1977-01-04 Hughes Aircraft Company π-Loop phase bit apparatus
US4056792A (en) * 1975-11-11 1977-11-01 Westinghouse Electric Corporation Wideband diode switched microwave phase shifter network
US4833429A (en) * 1987-05-29 1989-05-23 Elscint, Ltd. Quadrature combiner
US4931734A (en) * 1988-04-26 1990-06-05 U.S. Philips Corporation Magnetic resonance apparatus having a quadrature RF coil system
JPH0432301A (en) * 1990-05-29 1992-02-04 Mitsubishi Electric Corp Phase shifter
US6191735B1 (en) * 1997-07-28 2001-02-20 Itt Manufacturing Enterprises, Inc. Time delay apparatus using monolithic microwave integrated circuit
US6542051B1 (en) 1999-10-29 2003-04-01 Nec Corporation Stub switched phase shifter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704351A (en) * 1945-03-08 1955-03-15 Robert H Dicke Wave guide junction matching device
US2831974A (en) * 1954-09-10 1958-04-22 Marconi Wireless Telegraph Co Automatic frequency control systems
US2854645A (en) * 1956-08-27 1958-09-30 Itt Wide band waveguide circuitry
US2951149A (en) * 1960-01-04 1960-08-30 Itt Microwave radio receiver
US2951996A (en) * 1957-08-29 1960-09-06 Gen Electric Variable transmission network
US2991471A (en) * 1958-10-24 1961-07-04 Raytheon Co Transmitting and receiving circuits for wave transmission systems
US3032723A (en) * 1960-05-31 1962-05-01 Bell Telephone Labor Inc High speed microwave switching networks

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704351A (en) * 1945-03-08 1955-03-15 Robert H Dicke Wave guide junction matching device
US2831974A (en) * 1954-09-10 1958-04-22 Marconi Wireless Telegraph Co Automatic frequency control systems
US2854645A (en) * 1956-08-27 1958-09-30 Itt Wide band waveguide circuitry
US2951996A (en) * 1957-08-29 1960-09-06 Gen Electric Variable transmission network
US2991471A (en) * 1958-10-24 1961-07-04 Raytheon Co Transmitting and receiving circuits for wave transmission systems
US2951149A (en) * 1960-01-04 1960-08-30 Itt Microwave radio receiver
US3032723A (en) * 1960-05-31 1962-05-01 Bell Telephone Labor Inc High speed microwave switching networks

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192530A (en) * 1962-10-24 1965-06-29 Bernard I Small Electronically scanned array with diode controlled delay network
US3346822A (en) * 1963-02-15 1967-10-10 Cubic Corp Hybrid ring structure for reversing the phase of an rf signal in accordance with the level of a two-voltage level signal producing means
US3317860A (en) * 1964-04-20 1967-05-02 Robert V Garver Diode limiter
US3445772A (en) * 1965-09-22 1969-05-20 Hughes Aircraft Co Rf phase shift power coder
US3387217A (en) * 1966-04-08 1968-06-04 Air Force Usa Phase detector
US3471808A (en) * 1966-06-09 1969-10-07 Itt Phase shifter having different length conductors inserted into circuit by reed relays
US3638032A (en) * 1970-02-04 1972-01-25 Atomic Energy Commission Fast-acting magnetic switching device for high-level electrical signals and diverter incorporating same
US4001734A (en) * 1975-10-23 1977-01-04 Hughes Aircraft Company π-Loop phase bit apparatus
US4056792A (en) * 1975-11-11 1977-11-01 Westinghouse Electric Corporation Wideband diode switched microwave phase shifter network
US4833429A (en) * 1987-05-29 1989-05-23 Elscint, Ltd. Quadrature combiner
US4931734A (en) * 1988-04-26 1990-06-05 U.S. Philips Corporation Magnetic resonance apparatus having a quadrature RF coil system
JPH0432301A (en) * 1990-05-29 1992-02-04 Mitsubishi Electric Corp Phase shifter
JP2962771B2 (en) 1990-05-29 1999-10-12 三菱電機株式会社 Phase shifter
US6191735B1 (en) * 1997-07-28 2001-02-20 Itt Manufacturing Enterprises, Inc. Time delay apparatus using monolithic microwave integrated circuit
US6542051B1 (en) 1999-10-29 2003-04-01 Nec Corporation Stub switched phase shifter

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