US2159937A - Electrical device - Google Patents

Electrical device Download PDF

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Publication number
US2159937A
US2159937A US8100436A US2159937A US 2159937 A US2159937 A US 2159937A US 8100436 A US8100436 A US 8100436A US 2159937 A US2159937 A US 2159937A
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Grant
Patent type
Prior art keywords
tubes
beam
radio
gas
means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Vladimir K Zworykin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
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RCA Corp
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Filing date
Publication date
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H15/00Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/48Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
    • F16H15/50Gearings providing a continuous range of gear ratios
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C23/00Other surface treatment of glass not in the form of fibres or filaments
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00Glass compositions
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/02Refracting or diffracting devices, e.g. lens, prism
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03CMODULATION
    • H03C7/00Modulating electromagnetic waves
    • H03C7/02Modulating electromagnetic waves in transmission line, waveguide, cavity resonator or radiation field of antenna
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/26Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference

Description

May 23,` QSQ. VV K ZWORYWN 2,l59,937

ELECTRICAL DEVICE Original Filed Aug. 5l, 1933 il f f i@ .wow/JL Patented May 23, 1939 PAT OFFICE ELECTRICAL DEVICE Vladimir K. Zworykin, Philadelphia, Pa., assignor to Radio Corporation of America, a corporation of Delaware Original application August 31, 1933, Serial No. 687,575, now Patent No. 2,085,406, dated June Divided and this application May 21,

1936, Serial No. 81,004

7 Claims.

application Serial No. 687,575, led August 31,

1933, Patent No. 2,085,406 dated June 29, 1937, and entitled Electrical devices.

It is well known that radio energy having a short wave length (of'the order of 10 centimeters, for example) can be focused, reected, dispersed, etc. much the same as light by utilizing lenses, prisms, or the like, made of a proper material such as paraiiin.

An object of my invention is to provide devices of the above mentioned type which will be efcient in operation and comparatively cheap to manufacture.

A further object of my invention is to provide devices of the above mentioned type having quasioptical properties which can be controlled in y accordance with a voltage.

More specifically, an object of my invention is to provide ionized gas or space-charge devices for causing radio energy to be refracted, dispersed, reected, and the like.

Other features and advantages of my invention will appear from the following description taken in connection with the accompanying drawing, in which Figure 1 is a side view of a lens constructed in accordance with my invention and designed to diverge a radio beam;

Fig. 2 is a view of a modified form of a, lens embodying my invention;

Fig. Bis a view taken on the line of 3--3 looking in the direction ofthe arrows; y

Fig. 4 is a view of one embodiment of my'inv'ention designed for reflecting a radio beam;

Fig. 5 is a view of a refracting device utilizing the elements shown in Fig. 4;

Fig. 6 is a view illustrating one of the uses for my improved devices.

The embodiment of my invention illustrated in Fig. l comprises an envelope I which is approximately spherical in form and which is filled with a gas which can be readily ionized. One electrode of the device consistsof a metal band 3 in the form of a circle painted or deposited in any suitable manner upon the inside of the glass ionized, this region having the shape indicated by the dotted lines. By preference the pressure should be such that the ionized glow will be of the uniform type found in that region called the positive column. This characteristic discharge is well known to those skilled in the art; it is found at gas pressures varying from several tenths of a millimeter to several centimeters of mercury. It will be evident that these dotted lines indicate the distributionof the electric iield inside the container, and, since it is the region within this electric field which is ionized, the dotted lines also indicate the portion of the gas which is ionized. The electrodes are shaped and positioned to produce an electrostatic field of shape corresponding to the required lens action.

It Will be seen that this portion of ionized gas is in the shape of a disc which is thick in the middle and thin at the edge. Since ionized gas has an index-of refraction which is less than unity for the radio waves, such. waves will travel through the center of this gas lens more rapidly than through air, and the radio beam will be diverged by the lens.

Various gases or gas mixtures may be used in my lens but in general, one of the noble gases, such as neon, or a mixture of such gases, will be preferred.

'Ihe gas pressure may vary within wide limits, but preferably it should be low enough so that the ionized region of the gas will be uniformly ionized. Under this condition, it will be apparent that the lens properties of the device shown in Fig. 1 will depend mainly upon the shape of the ionized gas region.

From the foregoingdescription it will be understood that the lens properties of the device shown in Fig. 1 are substantially independent of the shape of' the envelope l, the eiective lens shape being determined by the distribution of the electric iield.

Fig. 2 shows a form of lens utilizing a plurality of circular ,gasllled tubes 23. Each tube has two electrodes 25 therein, one at each end of the tube, for impressing an ionizing potential upon the gas. This form of lens may be made either converging or diverging by changing the intensity of the discharge in each tube 23.

If a diverging lens is desired, the intensity of the discharge in the outer tube will be made Ygreater than that in any of the other tubes. The intensity of discharge will be graduated from a heavy discharge in the outer tube, through a diminishing discharge in the intermediate tubes, to a small discharge in the center tube. If a converging lens is desired, the discharge in the center tube will be made the heaviest, and the discharge in the outer tube the smallest.

Fig. 3 indicates how the degree of discharge or ionization in the different tubes 23 may be adjusted. All the tubes may be connected in parallel, as shown, each tube having a different value of resistance in series with it. Thus, as shown in Fig. 3, the outer tube is connected directly across a voltage source, and the next tubes have resistance units 21 of increasing value in series with them, the center tube having the largest value of resistance in series with it so that the ionization discharge in this tube will be small.

Fig. 4 illustrates a cylindrical mirror comprising a plurality of gas-filled tubes 29, eachtube having an electrode 3i at each end. When the gas in tubes 29 is ionized, they will act as a mir-1 ror to reflect any radio energy striking them. They may be designed to focus the parallel rays of a radio beam, as indicated in the figure.

Fig. 5 illustrates a prism made up of elements 4I constructed the same as the tubes shown in Fig. 4. Each tube 4I has an intensity of discharge which is different than that of the other tubes, and by means of a plurality of resistors 2l these intensities of discharge are graduated in the manner described in connection with Figs. 2 and 3.

Fig. 6 illustrates a signaling device it for airplanes or the like. A group of gas-lled tubes @9 such as shown in Fig. 5 are connected in parallel and supplied with an ionizing voltage modulated by anidentifying signal. This group of tubes is located on or near the earth at a point where an airplane pilot may wish to determine his position. For example, the device may be placed at one corner of a landing eld.

The airplane will carry means for transmitting and receiving a radio beam. In Fig. 6 there is shown a transmitting reflector il with its dipole antenna i3 and a receiving reflector l5 with a receiving dipole antenna Ti. To locate the corner of the landing field, a radio beam will be transmitted from reiiector li. This beam will be reected from the ground and received by rehector l5. If the airplane passes over the device im, the reiiected beam will be modulated by the identifying signal and the pilot will then know his exact position.

The same apparatus may be employed for locating and identifying ships in the dark or in a fog. The modulating device i@ will be placed on a side of a ship and on the outside so that a radio beam reflected from the side of the ship will pass through device 'lil and be modulated by a signal identifying the ship.

It will be understood that a portion of the radio beam will be reflected from the modulating de vice itself instead of from the earth. This portion of the beam also will be modulated since both the absorbing ability and the reflecting ability of the tubes will vary with the degree of ionization.

Various other modications may be made'in my invention without departing from the spirit and scope thereof, and I desire, therefore, that only such limitations shall be placed thereon as are necessitated by the prior art and set forth in the appended claims.

I claim as my invention:

1. An electrical mirror for ultra high radio frequency energy comprisingl a plurality of straight gas-filled tubes arranged in juxtaposed relation with their longitudinal axes parallel so as to form a semi-cylindrical surface, means for ionizingsaid gas, a beam' of ultra high radio frequency energy, and means for impressing said beam on said tubes whereby parallel rays of said ultra high frequency radio energy striking said surface will be brought into a desired focus.

2. In an electrical device, means for reflecting or refracting ultra high radio frequency energy, said means comprising a plurality of straight gas-filled tubes placed in juxtaposed relation with their longitudinal axes parallel to each other, each of said tubes having a pair of electrodes, means connecting respective electrodes in parallel, means for ionizing said gas, a source of ultra high radio frequency energy, and means for impressing at least a portion of said energy on said tubes whereby said energy is reflected or retracted a desired amount.

3. An electrical reflector for ultra high radio frequency energy comprising a plurality of straight gas-filled tubes arranged in juxtaposed relation with their longitudinal axes parallel so as to form a semi-cylindrical surface, each of said tubes having a pair of electrodes, means connecting respective electrodes in parallel, means for ionizing said gas, a source of ultra high radio frequency energy, and means for impressing at least a portion of said energy on said surface, whereby the rays o said energy will be brought to a desired focus.

4. In aV device for changing the course of a beam of ultra high radio frequency energy, a plurality of straight tubes filled with gas and placed in juxtaposed position with their longitudinal axes parallel, means for ionizing said gas, and a beam of ultra high radio frequency energy, said tubes being so positioned and arranged in said beam that the course of said beam is changed a desired amount.

5. A. device for altering a beam of ultra high radio frequency energy comprising a plurality of straight gas-filled tubes placed in juxtaposed ren lation with their longitudinal axes parallel to each other, said tubes being in the same plane, means for producing discharges of different relative intensities in said tubes, a beam of ultra high radio frequency energy, and means for impressing said beam on said tubes whereby said beam is altered a desired amount by said device.

6. A device for altering a beam of ultra high radio frequency radio energy .comprising a plurality of straight gas-lled tubes placed in juxtaposed relation with their longitudinal axes in a plane, means for producing discharges of different relative intensities in said tubes, said intensity of discharge being graduated from a middle tube to an outer tube, a beam of ultra high radio frequency energy, and means for impressing said l beam on said tubes so as to alter said beam a desired amount.

7. In combination, means forv radiating a beam of ultra high radio frequency energy, means for reflecting at least a portion of said beam, a plurality of gas-filled tubes containing free electric charges positioned between said radiating means and said reflecting means, means for controlling said electric charges in accordance with an identifying signal to thereby modulate said reflected portion of said beam, and means for receiving said reected and modulated portion of said beam.

VLADIMIR K. ZWORY'KIN.

US2159937A 1933-08-31 1936-05-21 Electrical device Expired - Lifetime US2159937A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US2085406A US2085406A (en) 1933-08-31 1933-08-31 Electrical device
US2047930A US2047930A (en) 1933-08-31 1933-08-31 Radio apparatus
US2159937A US2159937A (en) 1933-08-31 1936-05-21 Electrical device
US2106149A US2106149A (en) 1933-08-31 1936-06-09 Radio apparatus
US2173234A US2173234A (en) 1933-08-31 1936-06-09 Radio apparatus
US2142648A US2142648A (en) 1933-08-31 1936-06-09 Radio apparatus

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
BE354930A BE354930A (en) 1933-08-31
NL43272C NL43272C (en) 1933-08-31
FR35989E FR35989E (en) 1933-08-31 1928-10-11 transparent substances to ultraviolet rays and their manufacturing process
US2085406A US2085406A (en) 1933-08-31 1933-08-31 Electrical device
GB1750734A GB425571A (en) 1933-08-31 1934-06-13 Improvements in or relating to short wave radio apparatus
GB2454834A GB443426A (en) 1933-08-31 1934-08-25 Improvements in or relating to very short wave radio systems and apparatus
FR777801A FR777801A (en) 1933-08-31 1934-08-29 radio-electric device
DE1934R0091312 DE678078C (en) 1933-08-31 1934-08-31 Method of modulating microwaves
US2064582A US2064582A (en) 1933-08-31 1934-10-31 Radio apparatus
DE1935R0094597 DE690438C (en) 1933-08-31 1935-10-31
US2159937A US2159937A (en) 1933-08-31 1936-05-21 Electrical device
US2106149A US2106149A (en) 1933-08-31 1936-06-09 Radio apparatus
US2142648A US2142648A (en) 1933-08-31 1936-06-09 Radio apparatus
US2173234A US2173234A (en) 1933-08-31 1936-06-09 Radio apparatus

Publications (1)

Publication Number Publication Date
US2159937A true US2159937A (en) 1939-05-23

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ID=32074826

Family Applications (5)

Application Number Title Priority Date Filing Date
US2085406A Expired - Lifetime US2085406A (en) 1933-08-31 1933-08-31 Electrical device
US2159937A Expired - Lifetime US2159937A (en) 1933-08-31 1936-05-21 Electrical device
US2142648A Expired - Lifetime US2142648A (en) 1933-08-31 1936-06-09 Radio apparatus
US2173234A Expired - Lifetime US2173234A (en) 1933-08-31 1936-06-09 Radio apparatus
US2106149A Expired - Lifetime US2106149A (en) 1933-08-31 1936-06-09 Radio apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US2085406A Expired - Lifetime US2085406A (en) 1933-08-31 1933-08-31 Electrical device

Family Applications After (3)

Application Number Title Priority Date Filing Date
US2142648A Expired - Lifetime US2142648A (en) 1933-08-31 1936-06-09 Radio apparatus
US2173234A Expired - Lifetime US2173234A (en) 1933-08-31 1936-06-09 Radio apparatus
US2106149A Expired - Lifetime US2106149A (en) 1933-08-31 1936-06-09 Radio apparatus

Country Status (6)

Country Link
US (5) US2085406A (en)
BE (1) BE354930A (en)
DE (2) DE678078C (en)
FR (2) FR35989E (en)
GB (2) GB425571A (en)
NL (1) NL43272C (en)

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US2461005A (en) * 1940-04-05 1949-02-08 Bell Telephone Labor Inc Ultra high frequency transmission
US2503412A (en) * 1945-04-12 1950-04-11 Rca Corp Navigational system with beacon for determining angular position and distance
US2520008A (en) * 1940-04-05 1950-08-22 Bell Telephone Labor Inc Radio marker system
US2537102A (en) * 1944-07-26 1951-01-09 Stokes Irving Radio system for identifying friendly aircraft and the like
US2539594A (en) * 1948-07-17 1951-01-30 Robert H Rines System and method of communication
US2543130A (en) * 1946-07-03 1951-02-27 Bell Telephone Labor Inc Reflecting system
US2563990A (en) * 1944-09-23 1951-08-14 Bell Telephone Labor Inc Wave guide switching arrangement
US2592777A (en) * 1946-08-21 1952-04-15 Williams Frederic Calland Pulse-echo identifying system
US2641702A (en) * 1948-10-22 1953-06-09 Int Standard Electric Corp Control of wave length in wave guide and coaxial lines
US2656256A (en) * 1946-03-18 1953-10-20 Max L Yeater Method of testing a metallic sample
US2716746A (en) * 1950-10-31 1955-08-30 Rca Corp Focusing of radar beams for a tracking radar
US3287729A (en) * 1961-12-14 1966-11-22 Marconi Co Ltd Polarisers for very high frequency electro-magnetic waves
US3375519A (en) * 1960-05-19 1968-03-26 Litton Ind Of Maryland Inc Scanning reflector
US3955199A (en) * 1974-08-21 1976-05-04 The United States Of America As Represented By The Secretary Of The Navy Method of and apparatus for ground testing doppler navigation sets-a doppler radar simulator
US4347512A (en) * 1968-04-18 1982-08-31 Allied Corporation Communications systems utilizing a retrodirective antenna having controllable reflectivity characteristics
WO1988004876A1 (en) * 1986-12-23 1988-06-30 Milton Richard M An illuminated aerial marker
US6313802B1 (en) * 1992-11-10 2001-11-06 Stig Anders Petersson Waveguide lens and method for manufacturing the same

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US2733411A (en) * 1956-01-31 Microwave amplitude modulator-i
US2538062A (en) * 1940-03-22 1951-01-16 Touvet Guy Light communication system
US2432984A (en) * 1940-04-05 1947-12-23 Bell Telephone Labor Inc Electromagnetic wave reflection system
US2885665A (en) * 1941-05-29 1959-05-05 Rca Corp Pulse echo recognition systems
US2464269A (en) * 1942-06-12 1949-03-15 Raytheon Mfg Co Method and means for controlling the polarization of radiant energy
US2524292A (en) * 1944-04-18 1950-10-03 Rca Corp Radio vision system with high-speed scanner for short radio waves
BE474864A (en) * 1944-04-22
US2483768A (en) * 1944-06-15 1949-10-04 Rca Corp Microwave-acoustic wave translator
US2441749A (en) * 1944-08-07 1948-05-18 Carl M Brainard Electrically energized visible unit
US2463297A (en) * 1944-12-21 1949-03-01 Gulf Research Development Co Apparatus for testing insulating materials
US2599864A (en) * 1945-06-20 1952-06-10 Robertson-Shersby-Ha Rob Bruce Wave front modifying wave guide system
US2444060A (en) * 1945-07-27 1948-06-29 Bell Telephone Labor Inc Wave translating device
US2457601A (en) * 1945-07-27 1948-12-28 Bell Telephone Labor Inc Wave translating apparatus
BE471100A (en) * 1945-07-31
US2524765A (en) * 1945-07-31 1950-10-10 Standard Telephones Cables Ltd Radio beacon
US2703882A (en) * 1946-01-09 1955-03-08 Wilkes Gilbert Radiant energy transmission system
US2538063A (en) * 1946-07-11 1951-01-16 Touvet Guy Search and orientation system
US2707235A (en) * 1947-04-26 1955-04-26 Bell Telephone Labor Inc Frequency selective systems
US2510020A (en) * 1947-10-28 1950-05-30 Rca Corp Reflector for radar navigation
NL144629B (en) * 1948-02-06 Shell Int Research A process for the preparation of soluble condensation products, and in water-thinnable paint binders.
US2959783A (en) * 1948-03-16 1960-11-08 Iams Harley Scanning antennas using dielectric with variable refraction
US2538035A (en) * 1948-04-03 1951-01-16 Int Standard Electric Corp Absorbing screen for directive radiation
US2605428A (en) * 1948-04-22 1952-07-29 Henry P Kalmus Device for the amplification of minute space currents
US2576146A (en) * 1948-08-17 1951-11-27 Ruze John Rapid scanning system
US3404401A (en) * 1948-10-01 1968-10-01 Int Standard Electric Corp Directive beam rotating means
US2688744A (en) * 1948-11-12 1954-09-07 Philco Corp Means for controlling antenna characteristics in object locating systems of the reflection type
NL85466C (en) * 1951-04-06
DE969289C (en) * 1951-06-27 1958-05-14 Rundfunkschutzrechte Ev An arrangement for transmitting signals
FR1094934A (en) * 1953-11-19 1955-05-25 Antenna lobe scanning microwave
US3262118A (en) * 1959-04-28 1966-07-19 Melpar Inc Scanning antenna with gaseous plasma phase shifter
US3067420A (en) * 1959-04-28 1962-12-04 Melpar Inc Gaseous plasma lens
US3176227A (en) * 1959-09-23 1965-03-30 Bendix Corp Control of ions in ionic media for communication and other purposes
US3081432A (en) * 1960-04-27 1963-03-12 William W Balwanz Electromagnetic energy measurement apparatus and method
US3251997A (en) * 1961-02-10 1966-05-17 Varian Associates Optical communication system
US3155924A (en) * 1961-04-20 1964-11-03 Thompson Ramo Wooldridge Inc Plasma guide microwave selective coupler
DE1286593B (en) * 1962-08-09 1969-01-09 Philips Patentverwaltung Arrangement for controlling the reflection of radar waves using arranged as a plate dielectric and ferromagnetic material
US3245008A (en) * 1963-02-27 1966-04-05 Gen Electric Gas tube reflective surface ionizable by high energy electromagnetic waves
US3372394A (en) * 1963-07-29 1968-03-05 Trw Inc Electronically steerable antenna system utilizing controllable dipolar resonant plasma column
US3930715A (en) * 1973-05-24 1976-01-06 Brumlik George C Optical plasma devices
US4399403A (en) * 1981-09-22 1983-08-16 Strandberg Engineering Laboratories, Inc. Microwave moisture measuring, indicating and control apparatus
EP0230969A1 (en) * 1986-01-24 1987-08-05 Siemens Aktiengesellschaft Phased array antenna
GB8706340D0 (en) * 1987-03-17 1987-04-23 Ferranti Plc Object identification system
GB8927905D0 (en) * 1989-12-09 1990-02-14 Lucas Ind Plc Detection device
DE4336841C1 (en) * 1993-10-28 1995-05-04 Deutsche Aerospace Cover for radar antennas
US20080000232A1 (en) * 2002-11-26 2008-01-03 Rogers James E System for adjusting energy generated by a space-based power system

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520008A (en) * 1940-04-05 1950-08-22 Bell Telephone Labor Inc Radio marker system
US2461005A (en) * 1940-04-05 1949-02-08 Bell Telephone Labor Inc Ultra high frequency transmission
US2537102A (en) * 1944-07-26 1951-01-09 Stokes Irving Radio system for identifying friendly aircraft and the like
US2563990A (en) * 1944-09-23 1951-08-14 Bell Telephone Labor Inc Wave guide switching arrangement
US2503412A (en) * 1945-04-12 1950-04-11 Rca Corp Navigational system with beacon for determining angular position and distance
US2656256A (en) * 1946-03-18 1953-10-20 Max L Yeater Method of testing a metallic sample
US2543130A (en) * 1946-07-03 1951-02-27 Bell Telephone Labor Inc Reflecting system
US2592777A (en) * 1946-08-21 1952-04-15 Williams Frederic Calland Pulse-echo identifying system
US2539594A (en) * 1948-07-17 1951-01-30 Robert H Rines System and method of communication
US2641702A (en) * 1948-10-22 1953-06-09 Int Standard Electric Corp Control of wave length in wave guide and coaxial lines
US2716746A (en) * 1950-10-31 1955-08-30 Rca Corp Focusing of radar beams for a tracking radar
US3375519A (en) * 1960-05-19 1968-03-26 Litton Ind Of Maryland Inc Scanning reflector
US3287729A (en) * 1961-12-14 1966-11-22 Marconi Co Ltd Polarisers for very high frequency electro-magnetic waves
US4347512A (en) * 1968-04-18 1982-08-31 Allied Corporation Communications systems utilizing a retrodirective antenna having controllable reflectivity characteristics
US3955199A (en) * 1974-08-21 1976-05-04 The United States Of America As Represented By The Secretary Of The Navy Method of and apparatus for ground testing doppler navigation sets-a doppler radar simulator
WO1988004876A1 (en) * 1986-12-23 1988-06-30 Milton Richard M An illuminated aerial marker
US4839567A (en) * 1986-12-23 1989-06-13 Milton R M Illuminated aerial marker
US6313802B1 (en) * 1992-11-10 2001-11-06 Stig Anders Petersson Waveguide lens and method for manufacturing the same

Also Published As

Publication number Publication date Type
GB443426A (en) 1936-02-25 application
FR35989E (en) 1930-04-05 grant
NL43272C (en) grant
FR777801A (en) 1935-03-01 grant
US2142648A (en) 1939-01-03 grant
DE678078C (en) 1939-07-08 grant
BE354930A (en) grant
US2173234A (en) 1939-09-19 grant
US2085406A (en) 1937-06-29 grant
US2106149A (en) 1938-01-18 grant
GB425571A (en) 1935-03-18 application
DE690438C (en) 1940-04-25 grant

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