US2415242A - Switching in wave guide transmission system - Google Patents

Switching in wave guide transmission system Download PDF

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US2415242A
US2415242A US477176A US47717643A US2415242A US 2415242 A US2415242 A US 2415242A US 477176 A US477176 A US 477176A US 47717643 A US47717643 A US 47717643A US 2415242 A US2415242 A US 2415242A
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wave
guide
wave guide
resonant
switching
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US477176A
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William D Hershberger
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RCA Corp
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RCA Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/10—Auxiliary devices for switching or interrupting
    • H01P1/12—Auxiliary devices for switching or interrupting by mechanical chopper
    • H01P1/122—Waveguide switches

Definitions

  • This invention relates generally to ultra-high frequency wave transmission systems and more particularly to switching means for ultra-high frequency wave guides.
  • the instant invention is an improvement upon the device described in applicant's U. S; Patent 2,189,549, granted February 6, 1940, which discloses a thermionic tube circuit for providing switching in concentric high frequency transmission lines.
  • Positive switching in wave guide ultra-high frequency transmission systems is especially use- I ful in systems employing branched wave guides which are connected to corresponding load devices.
  • a branched wave guide transmission system may be connected to a plurality of ultra-high frequency radiators which are energized alternately or successively by switching the wave guides in the transmission circuit.
  • the apparatus disclosed in detail hereinafter provides means for inserting effectively a substantially infinite impedance in one branch of a branched wave guide transmission system to close this branch, while at the same time permitting substantially unimpeded transmission of the ultra-high frequenc waves in the other branch of the wave guide system.
  • the insertion of an infinite impedance is meant herein to comprise the insertion of a wave reflecting or wav attenuating device to prevent wave transmission beyond the point of insertion in the guide.
  • the common characteristic of all of theswitching systems disclosed herein is th insertion of a substantially infinite impedance at a point which is substantially an integral number of half wave lengths in the guide at the operating frequency along the selected wave guide branch from the junction thereof with the remainder of the wave guide transmission system.
  • a high impedance thus placed provides reflections which effectively present a similar substantially infinite impedance at the junction of the branched wave guides.
  • Another object is to provide an improved method of and means for switching ultra-high frequency waves in a wave guid transmission system. Another object is to provide an improved method of and means for selectively switching guide waves in a branched wave guide transmission system. A further object is to provide an improved method'of and means for guiding waves alternately through separate branches of a branched wave guide transmission system to apply energy to separate load devices. Another object is to provide an improved method of and means for inserting substantially infinite impedances in a branched wave guide transmission system at points which are substantially integral numbers of halfwave lengths in the guide at the operating frequency from the branch point of the wave guide system.
  • Another object is to provide an improved high impedance device for a wave guide transmission system which comprises a resonant aperture which may be ionized selectively upon the application of an externally derived voltage.
  • a further object is to provide an improved substantially infinite impedance device for insertion in a wave guide transmission system which comprises a resonant chamber including an ionizing device for ionizing selectively a portion of the resonant chamber and aperture devices for controlling the coupling between the wave guide and the resonant chamber to control effectively the selectivity 1 thereof.
  • Figure 1 is a schematic plan diagram of one embodiment thereof;
  • Figure 2 is a sectional view of Figure 1;
  • Figure 3 is a schematic diagram of a second embodiment of the invention;
  • Figure 4 is an elevational view of a, resonant aperture device utilized in Figure 3;
  • Figure 5a. is a fragmentary elevational view of a third embodiment of the invention,
  • Figure 5b is a fragmentary elevational view of a modification of Figure 5a
  • Figure 6 is an equivalent circuit diagram for the device of Figure 5. Similar reference numerals are applied to similar elements throughout the drawing.
  • a. transmitter l which may, for example, consist of a magnetron oscillator, is coupled in any conventional manner to one end of a first wave guide 2.
  • the remaining end of the wave guide 2 terminates in two branched wave guides 3 and 4. .
  • the remaining endsv of the branched wave guides 3 and 4 may b terminated in load devices, such as antennas or the like which are not shown.
  • a flat vane 5 is pivoted on a shaft 6 to be inserted transversely through a slot I in the firstbranched wave guide 3 or a slot 8 in the second branched wave guide 4.
  • the slots I and 8 are preferably located any integral number of half wave lengths at the operating frequency from the junction with the first wave guide 2.
  • the slots should be only slightly wider than the thickness of the vane 5.
  • the vane i may be semi-circular as indicated in Figure 2 and equipped with stops to providev pled to a similar first wave guide l alternate interruption of either wave guide branch.
  • Figure 3 includes a similar transmitter l con- 2 which terminates in branched wave guides 3 and 4.
  • the open ends of the wave guides 3 and 4 may be coupled to any suitable load devices, not shown.
  • First and second resonant aperture devices il i and I2 are'inserted in the branch wave guides 3 and 4, respectively at points which are preferably an integral number of half wave lengths at the from the junction of the with the first wave guide 2.
  • devices Ii and I2 willbe operating frequency branch wave guides The resonant aperture described in detail hereinafter. They are connected through switches l3 and I4 respectively to a keying generator or other source of high potential IS. The keying voltages thus applied to the resonant aperture'devices cause ionization of the gas in the narrow aperture therein which thereby introduces a substantially infinite impedance in the branch wave guide at that point. when no ionization of the gas in the resonant aperture device occurs, substantially unimpeded wave transmission through the resonant aperture is provided.
  • the resonant aperture devices H and I2 of Figure 3 comprise two complementary conducting elements 2
  • the complete unit is supe ported by any suitable clamping member 23.
  • , 22 determines the frequency at which the aperture resonates.
  • the device may be considered to consist of two highly inductive elements 2i, 22in series with a capacitor formed by the fiat faces 21, 23 which are separated by a narrow air gap 23. It is this narrow air gap 23 which is ionized by the keying voltage derived from the keying generator l5.
  • the resonant chamber 34 includes first and second fixed aperture stop devices 35 and 33 disposed transversely with respect to the wave guide 3.'
  • the resonant chamber 34 should preferably be tuned to resonance by means of a tuning screw 31 which is adJusted by a tuning knob 38.
  • the walls of the resonant chamber 34 are bent outwardly to support a gaseous discharge tube 39 in a position which permits a small portion of the gas containing envelope to be within the resonant chamber. If the guide 3 is conveying a wave of the H01 type, and the guide is rectangular in cross-section, the flared out portion 45 is excited in its E0 mode. That is,
  • the resonant cavity behaves as a transformer for guided waves to convert Hm waves into either E0 waves leaving by the guide section 45 or Hm waves leaving the cavity 34 by the aperture 36.
  • the aperture 35 is the input aperture.
  • the guide section 45 is then preferably operated as a cut-ofl guide for E0 waves. Coupling between the lamp 33 and the cavity 34 then is varied in a simple and effective manner by varying the penetration. of the lamp 39 in the section of cut-off guide 45.
  • the gaseous discharge tube 33 should be so located that no ionization therein occurs due to the normal wave transmission through the resonant chamber 34.
  • the electrodes of the gaseous discharge tube are connected through a switch 43 to a source of high potential 4
  • the device of Figure 5 may be substituted for both of the resonant aperture devices of Figure 3, and that the gaseous dicsharge tubes of each resonant cham# ber device may be ionized by any suitable external voltage source.
  • therresonant' characteristics'of the resonant chamber device 34 may be changed by electronic or mechanical means which are actuated by the keying element.
  • Such expedients for varying the resonantcharacteristics of resonant chambers are wellknown in the art.
  • An example of suchan expedient, shown in Figure 5b, is the periodic introduction in the resonant cavity of a cylindrical plug 41 of metal or dielectric material, such as styrol, having low losses and a high dielectric constant with respect to air. To be most eflective this material is introduced in the cavity at a high potential point such as is occupied by the lamp 38 in' Figure 50.
  • the invention described comprises a new and improved method of and means for switching guided waves in a wave guide ultra-high frequency transmission system.
  • first ultra-high frequency wave guide means for introducing ultra-high frequency waves into said first guide,- second and third wave guides connected in branched operative relation to one end of said first waveguide,
  • first wave switching means comprising a first resonant aperture device in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant aperture device in said thirdwave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means for selectively providing ionization of the gas in the apertures of said first and said second switching 'means providing selective introduction of asubstantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
  • firstultra-high frequency means for introducing ultra-high irequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means for selectively providing ionization of at least a portion of the gas in said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one Of said second and said third wave guides.
  • first ultra-high frequency wave guide means for introducing ultra-high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including an externally excited gaseous discharge tube disposed in each of said resonant chambers for selectively providing ionization of at least a portion of the gas in said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
  • Apparatus of the type described in claim 2 including tuning means for said resonant chambers.
  • Apparatus of the type described in claim 2 including fixed aperture devices between said wave guides and said resonant chambers for controlling the selectivity characteristics of said chambers.
  • first-ultra-high frequency wave guide means for introducing ultra-high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide
  • first wave switching means comprising a first resonant aperture device in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide
  • second wave switching means comprising a second resonant aperture device in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide
  • means including a keying generator for selectively providing ionization of the gas in the apertures of said first and said second switching means providing selective introduction of a substantially infinite impedance frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of saidfirst wave guide
  • first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating
  • first ultra-high frequency wave guide means for introducing ultra high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including movable dielectric elements in each of said resonant chambers for adjusting selectively the resonant characteristics of said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.

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Description

1947. I w. D. HERSHBERGER 5, 4
SWITCHING IN WAVE GUIDE TRANSMISSION SYSTEM- Filed Feb. 25, 1943 E iq ii I/ "gll Patented Feb. 4, 1947 SWITCHING IN WAVE GUIDE TRANSMISSION SYSTEM William D. Hershberger, or to Radio Corporatio tion of Delaware Princeton, N. J assignn of America; a corpora- Application February 25, 1943, Serial No. 477,176
Claims. (01. 178-44) This invention relates generally to ultra-high frequency wave transmission systems and more particularly to switching means for ultra-high frequency wave guides. A
The instant invention is an improvement upon the device described in applicant's U. S; Patent 2,189,549, granted February 6, 1940, which discloses a thermionic tube circuit for providing switching in concentric high frequency transmission lines.
Positive switching in wave guide ultra-high frequency transmission systems is especially use- I ful in systems employing branched wave guides which are connected to corresponding load devices. For example, a branched wave guide transmission system may be connected to a plurality of ultra-high frequency radiators which are energized alternately or successively by switching the wave guides in the transmission circuit.
The apparatus disclosed in detail hereinafter provides means for inserting effectively a substantially infinite impedance in one branch of a branched wave guide transmission system to close this branch, while at the same time permitting substantially unimpeded transmission of the ultra-high frequenc waves in the other branch of the wave guide system. The insertion of an infinite impedance is meant herein to comprise the insertion of a wave reflecting or wav attenuating device to prevent wave transmission beyond the point of insertion in the guide. The common characteristic of all of theswitching systems disclosed herein is th insertion of a substantially infinite impedance at a point which is substantially an integral number of half wave lengths in the guide at the operating frequency along the selected wave guide branch from the junction thereof with the remainder of the wave guide transmission system. A high impedance thus placed provides reflections which effectively present a similar substantially infinite impedance at the junction of the branched wave guides.
Among the objects of the invention ar to provide an improved method of and means for switching ultra-high frequency waves in a wave guid transmission system. Another object is to provide an improved method of and means for selectively switching guide waves in a branched wave guide transmission system. A further object is to provide an improved method'of and means for guiding waves alternately through separate branches of a branched wave guide transmission system to apply energy to separate load devices. Another object is to provide an improved method of and means for inserting substantially infinite impedances in a branched wave guide transmission system at points which are substantially integral numbers of halfwave lengths in the guide at the operating frequency from the branch point of the wave guide system. Another object is to provide an improved high impedance device for a wave guide transmission system which comprises a resonant aperture which may be ionized selectively upon the application of an externally derived voltage. A further object is to provide an improved substantially infinite impedance device for insertion in a wave guide transmission system which comprises a resonant chamber including an ionizing device for ionizing selectively a portion of the resonant chamber and aperture devices for controlling the coupling between the wave guide and the resonant chamber to control effectively the selectivity 1 thereof.
The invention will be described in greater detail by referenc to the accompanying drawing of which Figure 1 is a schematic plan diagram of one embodiment thereof; Figure 2 is a sectional view of Figure 1; Figure 3 is a schematic diagram of a second embodiment of the invention; Figure 4 is an elevational view of a, resonant aperture device utilized in Figure 3; Figure 5a. is a fragmentary elevational view of a third embodiment of the invention, Figure 5b is a fragmentary elevational view of a modification of Figure 5a, and Figure 6 is an equivalent circuit diagram for the device of Figure 5. Similar reference numerals are applied to similar elements throughout the drawing.
Referring to Figure 1, a. transmitter l which may, for example, consist of a magnetron oscillator, is coupled in any conventional manner to one end of a first wave guide 2. The remaining end of the wave guide 2 terminates in two branched wave guides 3 and 4. .The remaining endsv of the branched wave guides 3 and 4 may b terminated in load devices, such as antennas or the like which are not shown. A flat vane 5 is pivoted on a shaft 6 to be inserted transversely through a slot I in the firstbranched wave guide 3 or a slot 8 in the second branched wave guide 4. The slots I and 8 are preferably located any integral number of half wave lengths at the operating frequency from the junction with the first wave guide 2. Preferably the slots should be only slightly wider than the thickness of the vane 5. The vane i may be semi-circular as indicated in Figure 2 and equipped with stops to providev pled to a similar first wave guide l alternate interruption of either wave guide branch.
Figure 3 includes a similar transmitter l con- 2 which terminates in branched wave guides 3 and 4. The open ends of the wave guides 3 and 4 may be coupled to any suitable load devices, not shown.
First and second resonant aperture devices il i and I2 are'inserted in the branch wave guides 3 and 4, respectively at points which are preferably an integral number of half wave lengths at the from the junction of the with the first wave guide 2. devices Ii and I2 willbe operating frequency branch wave guides The resonant aperture described in detail hereinafter. They are connected through switches l3 and I4 respectively to a keying generator or other source of high potential IS. The keying voltages thus applied to the resonant aperture'devices cause ionization of the gas in the narrow aperture therein which thereby introduces a substantially infinite impedance in the branch wave guide at that point. when no ionization of the gas in the resonant aperture device occurs, substantially unimpeded wave transmission through the resonant aperture is provided. v
Referring to Figure 4, the resonant aperture devices H and I2 of Figure 3 comprise two complementary conducting elements 2|, 22 which are insulated from each other by transverse insulating members 23, 24. The complete unit is supe ported by any suitable clamping member 23. The size and shape of the aperture 23 formed by the complementary conformations of the conducting members 2|, 22 determines the frequency at which the aperture resonates. The device may be considered to consist of two highly inductive elements 2i, 22in series with a capacitor formed by the fiat faces 21, 23 which are separated by a narrow air gap 23. It is this narrow air gap 23 which is ionized by the keying voltage derived from the keying generator l5.
Referring to Figure 5a, a section of the branch wave guide 3, for example, includes a resonant chamber'34 instead of the resonant aperture device l I shown in Figure 3. The resonant chamber 34 includes first and second fixed aperture stop devices 35 and 33 disposed transversely with respect to the wave guide 3.' The resonant chamber 34 should preferably be tuned to resonance by means of a tuning screw 31 which is adJusted by a tuning knob 38. The walls of the resonant chamber 34 are bent outwardly to support a gaseous discharge tube 39 in a position which permits a small portion of the gas containing envelope to be within the resonant chamber. If the guide 3 is conveying a wave of the H01 type, and the guide is rectangular in cross-section, the flared out portion 45 is excited in its E0 mode. That is,
the resonant cavity behaves as a transformer for guided waves to convert Hm waves into either E0 waves leaving by the guide section 45 or Hm waves leaving the cavity 34 by the aperture 36. The aperture 35 is the input aperture. The guide section 45 is then preferably operated as a cut-ofl guide for E0 waves. Coupling between the lamp 33 and the cavity 34 then is varied in a simple and effective manner by varying the penetration. of the lamp 39 in the section of cut-off guide 45.
The gaseous discharge tube 33 should be so located that no ionization therein occurs due to the normal wave transmission through the resonant chamber 34. The electrodes of the gaseous discharge tube are connected through a switch 43 to a source of high potential 4|. when the 75 wave guide,
- -4 switch 43 is closed, ionization occurs within the gaseous discharge tube 33 and the ionized portion of the tube within the resonant chamber 34 changes the resonant characteristics thereof snfiiciently to offer a substantially infinite impedance to the. waves transmitted through the system. The selectivity of the system is greatly enhanced by selecting a suitable aperture size in the aperture devices 33, 33.
The equivalent electrical circuit for the device described in Figure 5a is shown in Figure 6 whereby the inductances 42 and 43 and the varicircuit so that the impedance of this circuit viewed at the input terminals becomes highlyreactive at the operating frequency.
It should be understood that the device of Figure 5:: may be substituted for both of the resonant aperture devices of Figure 3, and that the gaseous dicsharge tubes of each resonant cham# ber device may be ionized by any suitable external voltage source.
It should also be understood that therresonant' characteristics'of the resonant chamber device 34 may be changed by electronic or mechanical means which are actuated by the keying element. Such expedients for varying the resonantcharacteristics of resonant chambers are wellknown in the art. An example of suchan expedient, shown in Figure 5b, is the periodic introduction in the resonant cavity of a cylindrical plug 41 of metal or dielectric material, such as styrol, having low losses and a high dielectric constant with respect to air. To be most eflective this material is introduced in the cavity at a high potential point such as is occupied by the lamp 38 in'Figure 50.
Thus the invention described comprises a new and improved method of and means for switching guided waves in a wave guide ultra-high frequency transmission system.
I claim as my invention:
1. In combination, a. first ultra-high frequency wave guide, means for introducing ultra-high frequency waves into said first guide,- second and third wave guides connected in branched operative relation to one end of said first waveguide,
first wave switching means comprising a first resonant aperture device in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant aperture device in said thirdwave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means for selectively providing ionization of the gas in the apertures of said first and said second switching 'means providing selective introduction of asubstantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
2. In combination, a firstultra-high frequency means for introducing ultra-high irequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means for selectively providing ionization of at least a portion of the gas in said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one Of said second and said third wave guides.
3. In combination, a first ultra-high frequency wave guide, means for introducing ultra-high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including an externally excited gaseous discharge tube disposed in each of said resonant chambers for selectively providing ionization of at least a portion of the gas in said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
4. Apparatus of the type described in claim 2 including tuning means for said resonant chambers.
5. Apparatus of the type described in claim 2 including fixed aperture devices between said wave guides and said resonant chambers for controlling the selectivity characteristics of said chambers.
6. In combination, a first-ultra-high frequency wave guide, means for introducing ultra-high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant aperture device in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant aperture device in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including a keying generator for selectively providing ionization of the gas in the apertures of said first and said second switching means providing selective introduction of a substantially infinite impedance frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of saidfirst wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a secondresonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including separate externally excited gaseous discharge tubes in each of said chambers for adjusting selectively the resonant characteristics of said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
10. In combination, a first ultra-high frequency wave guide, means for introducing ultra high frequency waves into said first guide, second and third wave guides connected in branched operative relation to one end of said first wave guide, first wave switching means comprising a first resonant chamber in said second wave guide disposed substantially an integral number of half wave lengths in the guide at the operating frequency from said one end of said first wave guide and second wave switching means comprising a second resonant chamber in said third wave guide disposed substantially an integral number of half wave lengths in the guide at said operating frequency from said one end of said first wave guide, and means including movable dielectric elements in each of said resonant chambers for adjusting selectively the resonant characteristics of said resonant chambers of said first and said second switching means providing selective introduction of a substantially infinite impedance to said waves in the corresponding one of said second and said third wave guides.
WILLIAM D. HERSHBERGER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS
US477176A 1943-02-25 1943-02-25 Switching in wave guide transmission system Expired - Lifetime US2415242A (en)

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US2745072A (en) * 1952-02-18 1956-05-08 Itt Wave guide gas switching device
US2762973A (en) * 1946-01-24 1956-09-11 Heinz E Kallmann Matchmeter
US2805415A (en) * 1952-08-02 1957-09-03 Sperry Rand Corp Microwave antenna system
US2831171A (en) * 1946-02-21 1958-04-15 Brown Allan Harvey Echo box having constant transient decay time
US2903652A (en) * 1952-03-11 1959-09-08 Itt Ultra-high frequency amplitude modulator
US3192530A (en) * 1962-10-24 1965-06-29 Bernard I Small Electronically scanned array with diode controlled delay network
EP0867964A1 (en) * 1997-03-24 1998-09-30 Raytheon Company Electrically switched multiport microwave launcher
US5841327A (en) * 1996-03-08 1998-11-24 Raytheon Company Electrically switched multiport microwave launcher
US20060244671A1 (en) * 2003-05-15 2006-11-02 Nec Corporation Feeder waveguide and sector antenna

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US2571156A (en) * 1951-10-16 Ultra high frequency field
US2618777A (en) * 1943-08-27 1952-11-18 Mini Of Supply Radio transmission and reception
US2487547A (en) * 1943-11-20 1949-11-08 Sylvania Electric Prod Wave shielding arrangement
US2484822A (en) * 1944-04-24 1949-10-18 Sperry Corp Switching apparatus for ultra high frequencies
US2577118A (en) * 1944-06-02 1951-12-04 Gen Electric Wave guide filter
US2567701A (en) * 1944-06-02 1951-09-11 Gen Electric Ultra high frequency coupling device for wave guides
US2500430A (en) * 1944-07-28 1950-03-14 Bell Telephone Labor Inc Cavity resonator oscillator device
US2521732A (en) * 1944-10-25 1950-09-12 Kline Morris Rotating antenna scanning system
US2530694A (en) * 1944-10-26 1950-11-21 Csf Device for guiding and landing aircraft by means of decimetric radio waves
US2480189A (en) * 1944-10-30 1949-08-30 Us Sec War Antenna system
US2515225A (en) * 1944-12-30 1950-07-18 Rca Corp Transceiver having switch controlled frequency compensator
US2480181A (en) * 1945-01-24 1949-08-30 Us Sec War Directive high-frequency antenna
US2576943A (en) * 1945-01-31 1951-12-04 Sperry Corp Wave guide modulation apparatus
US2623207A (en) * 1945-02-07 1952-12-23 Csf Radio obstacle detector
US2573713A (en) * 1945-02-21 1951-11-06 Bell Telephone Labor Inc Electrical wave guide switch
US2540148A (en) * 1945-03-22 1951-02-06 Sperry Corp Ultra high frequency powerselective protective device
US2573148A (en) * 1945-04-03 1951-10-30 Bell Telephone Labor Inc Tunable resonance chamber
US2597862A (en) * 1945-05-03 1952-05-27 John H Greig Electronic lobing
US2491971A (en) * 1945-07-13 1949-12-20 Raytheon Mfg Co Switch tube device for wave guides
US2647952A (en) * 1945-08-02 1953-08-04 Us Navy High power transmit-receive box
US2544715A (en) * 1945-08-30 1951-03-13 Sperry Corp Wave guide modulating and switching apparatus
US2530979A (en) * 1945-09-27 1950-11-21 Westinghouse Electric Corp Radio frequency control system
US2572088A (en) * 1945-12-22 1951-10-23 Sperry Corp Ultra high frequency coded transmitter system utilizing stored energy received by the system
US2762973A (en) * 1946-01-24 1956-09-11 Heinz E Kallmann Matchmeter
US2831171A (en) * 1946-02-21 1958-04-15 Brown Allan Harvey Echo box having constant transient decay time
US2708222A (en) * 1946-03-14 1955-05-10 Melvin A Herlin Wide tuning stabilizer
US2577511A (en) * 1946-05-24 1951-12-04 Seymour B Cohn Tunable radio frequency filter
US2588103A (en) * 1946-09-14 1952-03-04 Bell Telephone Labor Inc Wave guide coupling between coaxial lines
US2617032A (en) * 1946-10-18 1952-11-04 Donald K Allison Navigational device
US2668276A (en) * 1947-01-17 1954-02-02 Allen H Schooley Waveguide switch
US2575804A (en) * 1947-12-05 1951-11-20 Bell Telephone Labor Inc Microwave hybrid junction
US2660711A (en) * 1948-12-17 1953-11-24 Westinghouse Electric Corp Self-tuning resonant cavity
US2624002A (en) * 1949-08-19 1952-12-30 Maurice G Bouix Dielectric antenna array
US2664560A (en) * 1949-12-01 1953-12-29 Sperry Corp Radio aid to navigation
US2728050A (en) * 1950-05-20 1955-12-20 Hartford Nat Bank & Trust Co Device for modulating ultra-short waves in a transmission line
US2684410A (en) * 1951-02-21 1954-07-20 Gilfillan Bros Inc Blanking switch associated with variable wave guide antenna
US2703866A (en) * 1951-04-23 1955-03-08 Bendix Aviat Corp Wave guide switch
US2697209A (en) * 1951-07-13 1954-12-14 Itt Tunable band pass filter
US2745072A (en) * 1952-02-18 1956-05-08 Itt Wave guide gas switching device
US2903652A (en) * 1952-03-11 1959-09-08 Itt Ultra-high frequency amplitude modulator
US2805415A (en) * 1952-08-02 1957-09-03 Sperry Rand Corp Microwave antenna system
US3192530A (en) * 1962-10-24 1965-06-29 Bernard I Small Electronically scanned array with diode controlled delay network
US5841327A (en) * 1996-03-08 1998-11-24 Raytheon Company Electrically switched multiport microwave launcher
EP0867964A1 (en) * 1997-03-24 1998-09-30 Raytheon Company Electrically switched multiport microwave launcher
US20060244671A1 (en) * 2003-05-15 2006-11-02 Nec Corporation Feeder waveguide and sector antenna

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