US2129714A - Wave type converter for use with dielectric guides - Google Patents

Wave type converter for use with dielectric guides Download PDF

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Publication number
US2129714A
US2129714A US43795A US4379535A US2129714A US 2129714 A US2129714 A US 2129714A US 43795 A US43795 A US 43795A US 4379535 A US4379535 A US 4379535A US 2129714 A US2129714 A US 2129714A
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United States
Prior art keywords
waves
lines
type
guide
force
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Expired - Lifetime
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US43795A
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English (en)
Inventor
George C Southworth
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US43795A priority Critical patent/US2129714A/en
Priority to GB26068/36A priority patent/GB468548A/en
Priority to FR818503D priority patent/FR818503A/fr
Priority to NL47517D priority patent/NL47517C/xx
Priority to DEI56087D priority patent/DE738361C/de
Priority to US133810A priority patent/US2180950A/en
Priority to GB2808/38A priority patent/GB491196A/en
Priority to NL49995D priority patent/NL49995C/xx
Priority to FR49564D priority patent/FR49564E/fr
Priority to FR49566D priority patent/FR49566E/fr
Application granted granted Critical
Publication of US2129714A publication Critical patent/US2129714A/en
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/26—Punching reheated glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/06—Cutting or splitting glass tubes, rods, or hollow products
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/02—Local etching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/163—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion specifically adapted for selection or promotion of the TE01 circular-electric mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/52—Systems for transmission between fixed stations via waveguides

Definitions

  • the principal objectof my invention is to provide new and improved apparatus and a corresponding method by which electromagnetic waves of a certain type under propagation in a dielectric guide may be modified or reshaped so that they will go on as waves of a difierent type.
  • Another object of my invention is to provide for the introduction of conductive baflies or deflectors in a dielectric guide, such baffles being so shaped and proportioned that they will bend the lines of force of incoming electromagnetic waves in the guide and reshape them to'give outgoing waves of another type.
  • Figures 1, 3, 5 and '1 are longitudinal sections of a 'dielectric guide showing wave shapes of different types;
  • Figs. 2 4, 6 and 8 are respective cross sections;
  • Fig. 9 is a longitudinal section, partly in elevation, showing a converter for changing asymmetric magnetic waves to symmetric magnetic waves;
  • Figs. 10a to 100 comprise a set of cross sections of Fig. 9;
  • Figs. 11a and 11b are a pair of diagrammatic cross sections showing a modification of the device of Fig. 9;
  • Fig. 12 is a longitudinal section, partly in elevation, showing a converter for changing second order asymmetric magnetic waves to first order symmetric magnetic waves;
  • Figs. 13a to 13f comprise a set of cross sections of Fig.
  • Fig. 14 is'a diagram indicating one way in which second order asymmetric magnetic waves may be generated;
  • Fig. 15 is a longitudinal section of a converter for changing electromagnetic waves from asymmetric magnetic type to asymmetric electric type;
  • Figs. 16a to 160 comprise a set of cross sections of Fig. 15;
  • Fig. 17 is a longitudinal section showing a converter for changing asymmetric electric waves to asymmetric magnetic waves;
  • Figs. 18a to 180 comprise a set of cross sections of Fig. 1'7;
  • Fig. 19 is a longitudinal section, partly in elevation, showing a converter for changing asymmetric electric waves to symmetric magnetic waves;
  • Figs. 20 and 21 are cross sections taken on the correspondingly numbered lines of Fig. 19;
  • Fig. 22 is a perspective side view, partly in section, of
  • Figs. 23a to .23 comprise a set of cross sections corresponding to Fig. 22;
  • Fig. 24 is a longitudinal section showing a converter for changing asymmetric magnetic waves to symmetric magnetic waves;
  • Figs. 25a to 250 comprise a set of cross sections of Fig. 24;
  • Fig. 26 is a perspective side view, partly in section, showing a converter for changing symmetric electric waves to asymmetric magnetic waves;
  • Figs. 27a to 27 comprise a set of .cross sections of Fig. 26;
  • Fig. 28 is a perspective side view, partly in section, showing a converter for changing symmetric electric waves to asymmetric magnetic waves;
  • Figs. 29a to 29g comprise a set of cross sections of Fig. 28;
  • FIG. 30 is a perspective side view, partly in section showing a converter for changing symmetric electric waves to asymmetric magnetic waves;
  • Figs. 31m to 31f comprise a set of cross sections of Fig. 30;
  • Fig. 32- is a side elevation, partly insection, showing a converter adapted to change symmetric electric waves to symmetric magnetic waves;
  • Figs. 33 and 34 are cross sections indicated by corresponding lines on Fig. 32;
  • Fig. 35 is a perspective view, partly in section, showing a converter for changing symmetric electric waves to symmetric magnetic waves;
  • Figs. 36a to 36d comprise a set of cross sections of Fig. 35.
  • dielectric guide is meant to indicate a wave guide comprising a body of dielectric extending from one place to another place and bounded laterally by a dielectric discontinuity. v Such a dielectric guide functions by the generation therein at the one place of electromagnetic waves and their propagation therein to the other place.
  • a form of dielectric guide which will be convenient for consideration in this connection consists of a cylindrical body of air or empty space as the dielectric,
  • Waves of this character within a dielectric guide I term dielectrically guided waves, and a dielectric guide system is to be understood to mean a system adapted for or utilizing such waves.
  • dielectrically guided wavesthere may be identified different types, that is, waves of different characteristic field pattern.
  • waves have substantial components of electric force parallel to the axis of the guide they are called electric, but if they have substantial components of magnetic force in that direction they are called magnetic.
  • lines of force electric .guide with the thickness of the sheath greatly exaggerated to facilitate the disclosure.
  • continuous lines represent lines of electric force
  • dotted lines represent lines of magnetic force.
  • the present invention has to do in great measure with the provision of a method and apparatus for converting one type of wave into an-' other type of wave.
  • a conversion may be useful when one has a generator associated with the dielectric guide at the transmitting end so waves of one type are produced and it is desired to transmit waves 'of a different type; or when waves of one type are received through a dielectric guide and it is more convenient toreceive another type, into which, accordingly, the first type may be converted.
  • a wave converter of the present invention may be employed.
  • a screen of radial wires like those shown at H15 in Fig. 250, which will purify the outgoingwave to the symmetric magnetic type. Since the lines of electric force of the outgoing symmetric magnetic waves will cut the radial wires of the screen I05 each at a right angle, there will be no tendency to develop electromotive forces in those radial conductors; there will be no loss of energy this way the screen I05 may be called a purifier for the symmetric magnetic waves passing through it.
  • the waves considered hereinbefore may be thought of as being of first order type. But it is possible to generate waves in dielectric guides with more elaborate or 'cornplex grouping of the lines of force in what may properly be called wave types of, higher order.
  • the waves of asymmetric magnetic type of the first order may be generated by an oscillator connected to--two diametrically opposite points within a dielectric guide at the left, as shown in Fig. 9. But if the oscillator is connected to points a quadrant distance around thecircumference, as shown in Fig. 14, the oscillatory currents will develop lines of force as shown in that figure,,corresponding to what may properly be called asymmetric magnetic waves of the second order.
  • Asymmetric magnetic waves coming'from the ammm left in Fig. 15 have their lines of electric force in cross section.
  • FIGs. 17 and 18a to 180 Another converter to operate either way between asymmetric electric waves and asymmetric magnetic waves is shown in Figs. 17 and 18a to 180.
  • Incoming asymmetric electric waves from the left fix the ends of their lines of force upon the left-hand ends of the opposite kidney-shaped electrodes I06 and I01. These electrodes going from left to right are spread apart and opened out into part cylindrical shells, and the lines of force are stretched out between them so that on the right they are launched forth as asymmetric magnetic waves.
  • Asymmetric electric waves coming from the left in Fig. 19 have their lines of force picked up by the two kidney-shaped electrodes 46 'having the cross section shown in Fig. 20.
  • the conductors from these kidney-shaped electrodes are gradually deformed, going from left to right, as indicated in Fig. 19, until they make a coaxial conductor system as shown at 44 and 43.
  • the inner and outer conductors 44 and 43 are connected, respectively, at the middle points of the two intersecting parts of the figure-0 frame shown at in Figs. 19 and 21 In this frame it will be seen that when the currents circulate clockwise in the upper member they also circulate clockwise in the lower member.
  • the ratio of the inner and outer radii is chosen at such a value as to give a proper impedance match between the dielectric guide D on the left and this coaxial conductor system having the inner conductor 51. Going on to the right, the lines of force are gradually redirected, extending across between the two conductors 55" and 51',
  • Fig. 22 The system of Fig. 22 has been described as for conversion from symmetric electric to asym-' metric electric, going from left to right. It will readily be apparent that the system may be employed for converting from asymmetric electric to symmetric electric, going from rightto left.
  • a wave type converter will be reversible; that is, if it converts from one type to another type going from left to right, it will conmethod or apparatus of each such claim may be employed either way.
  • the lines of electric force of asymmetric magnetic waves coming from the left are received on the conductors I54 which lie in a plane transverse to the axis of the dielectric guide D.
  • These lines of force acting on the intermediate parts I54 of these conductors generate series-assisting electromotive forces in the circumferential parts I52 and I53 between which the parts I54 are connected.
  • these currents in the parts I52 and I53 are directed alike around the guide axis. From these circumferential segments, such as I52 and I53, the lines of force are detached and radiated on along the guide core, linking together in the form of the desired symmetric magnetic waves.
  • a sieve of radial wires I05 is provided on the right to purify the symmetric magnetic waves, in other words, to block-any component at that place which may be present corresponding to the input asymmetric magnetic waves which might tend to break through on the output side.
  • a sieve of horizontal wires I06 at the left purifies the incoming waves against other components than those belonging to the asymmetric" on the coaxial inner conductor 59 as coaxial conductor waves with their lines of electric force extending radially between the two conductors 59 and D. Each of these two conductors is split, one on one side and theother on the other side, as in Fig. 270.
  • the gap 60 in the outer shell may be filled with dielectric material as at 6
  • FIGs. 30 and 31a to 311 Yet another converter between the same two types is shown in Figs. 30 and 31a to 311.
  • the incoming symmetric electric waves from the left are converted into coaxial conductor system waves with radial lines of force as shown in Fig. 31a.
  • the central conductor is split as one goes from left to right and given a spiral cross section, with the outer end of the spiral connected eventually to the shell of the dielectric guide. 'I'hen going on from left to right, the inner part of the spiral is gradually cut away and the transverse lines of electric force of the waves are brought more and more to an approximately horizontal direction, until finally the wave is launched at the right as an asymmetric magnetic wave.
  • the system of Figs. 32, 33 and 34 may be employed.
  • the incoming symmetric electric waves from the left are received on the coaxial conductor system having the central core and the outer shell D which is the shell of the dielectric guide.
  • the lines of force extend radially between these two conductors.
  • ends at the right in two arms bent around as shown in the cross section of Fig. 33.
  • the radial lines of force coming from the left are deflected by the extensions 52-53 and radiated therefrom to the right in the form of symmetric magnetic waves.
  • the sieve of radial wires 54' blocks any superposed remnant of the symmetric electric waves and permits the passage to the right of only the purified resultant symmetric magnetic waves.
  • Fig. 35 shows apparatus for the conversion of symmetric electric waves to symmetric magnetic waves.
  • Symmetric electric waves of the character indicatedv in Figs. 1 and 2 are to be thought of as coming along the dielectric guide D of Fig. 35 from the left toward the right.
  • At 15 there are flat members arranged side by side to form a cylindrical contour.
  • the radii of the shell D and of the compositecylinder 15 are appropriate to match the impedances of the dielectric guide D on the left to the combination D'
  • each strip or plate I5 is given a progressive helical twist and at the same time is made wider; also, going from left to right over this same stretch from D to D, the diameter of the enclosing metallic sheath is increased gradually.
  • each strip 15 has been twisted 90 degrees so that in a cross section at 15' each section is radial.
  • the members extend radially, they merely touch the inside wall of the metallic sheath D, but are spaced slightly therefrom.
  • a dielectric guide and conductive baffles therein adapted to engage the ends of lines of force of incoming dielectrically guided waves of one type in said guide and to deflect and reconnect such lines of force and detach them from the bailles in the shape of lines of force of another type of waves.
  • a dielectric guide and conductive bailles therein adapted to cut into the lines of force of incoming'dielectrically guided waves of,a certain type, said baffles being bent as one goes along them in the direction of wave transmission so as to reshape the lines of force on them and discharge them in the direction of the outgoing waves to form such waves of a different desired type.
  • a converter to change electromagnetic waves in a dielectric guide from one dielectrically guided type to another comprising a plurality of helical baflles side by side to act on different parts of the incoming wave front and rotate their lines of force so that at the discharge ends of the baservers they will link together to form waves of the desired output type.
  • a dielectric guide means to convert incoming dielectrically guided waves of one type therein to outgoing waves substantially of another type, and a screen across the guide on the output side to purify the waves of the outgoing type.
  • a dielectric guide,awavetype converter therein adapted to deliver symmetric magnetic waves on its output side, and a screen of radial wires on the output side to purify such waves.
  • a dielectric guide andmeans therein to convert incoming dielectrically guided waves of one type to outgoing waves of another type, said guide having a diiferent diameter each way from said means, the greater diameter being associated with the wave type'oi higher cut-ofi frequency.
  • a converter for changing asymmetric magnetic Waves to symmetric magnetic waves consisting of a main guide for the incoming asymmetric magnetic waves, a plurality of smaller parallel branch guides, respective helical bailles in said branch guides adapted to rotate the lines of electric force so that at the discharge ends of the said baflles they will link together in sequence in coaxial circles, and an outgoing dielectric guide connected around such discharge ends.
  • a dielectric guide, helical battles therein side'by side adapted at their ends one way to receive respective groups of lines of force of second order asymmetric magnetic waves and rotate those lines of force so that at the discharge end they will be directedjn sequence around the axis so as to link together and form coaxial circular lines of force of symmetric magnetic waves.
  • a dielectric guide and means therein to convert electromagnetic waves from one to the other of the two types, asymmetric magnetic and asymmetric electric, such means consisting of two conductors inside the guide with opposed kidney-shaped cross sections at one end and opening out to opposed arc-shaped cross sections at the other end.
  • a dielectric guide means core and a cylindrical conductive shell, said core being graded trough-like into a semi-cylindrical shell, and said cylindrical shell being beveled to an opposite semi-cylindrical shell, and the resultant two semi-cylindrical shells being fused together.
  • the method of operating a dielectric guide system which comprises generating dielectrically guided waves of a first type, converting said waves to dielectrically guided waves of a second type, and propagating said waves of the second type along a dielectric guide.
  • the method 1 which comprises generating dielectrically guided waves of a certain type, distorting said waves to produce dielectrically guided waves of another type, and propagating said waves of another type along a dielectric guide.
  • a generator of dielectrically guided waves of a first type means in the vicinity of said generator for progressively modifying said waves to produce dielectrically guided waves of a second type, a dielectric guide and means for applying said waves of said second verting one type of dielectrically guided wave into another comprising a pair of metallic members within the guide, said members being oi. progressively different cross-section along the guide, sub.- stantially arcuate and peripheral at one point and more nearly axial and oval at another point.
  • means for converting one type of dielectrically guided wave into another comprising a metal-sheathed section of guide and a metallic core therein which progressively along the section of guide is coaxial at one point, eccentric at another and joined to the sheath at another, whereby symmetric waves at the one point and asymmetric waves at the lastmentioned point are inter-convertible.
  • a cylindrical metalsheathed dielectric guide carrying dielectrically guided waves of the symmetric magnetic type and a purifier of waves of that type comprising a multiplicity of radial conductors electrically connected at the axis of said guide to each other and at their peripheral ends to the sheath.
  • a metal-sheathed dielectric guide carrying dielectrically guided waves of a certain type and means for attenuating said waves comprising a plurality of conductors lying in planes containing the axis of said guide and interconnected to provide a plurality of closed transverse loops.
  • means for purifying dielectrically guided waves of a certain type therein comprising a screen of conductors that are substantially orthogonally disposed with respect to the electric field of said waves.
  • means for attenuating dielectrically guided waves of a certain type therein comprising a plurality of conductors disposed obliquely with respect to the lines of electric intensity of said Waves and connected to form a plurality of conductive loops for the circulation of current.
  • a screen of parallel wires extending across said structure in the path of said waves.
  • a screen comprising a multiplicity of parallel conductors extending across said guide in the path of said waves and interconnected to form a plurality of electrically closed circuits.
  • a wave guide means within the guide to generate dielectrically guided waves having a substantial component of a certain type of waves, and a sieve across the guide consisting of conductors extending transversely to the lines of force of waves of that type, whereby undesired components will be suppressed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Waveguides (AREA)
  • Magnetic Treatment Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Particle Accelerators (AREA)
US43795A 1935-10-05 1935-10-05 Wave type converter for use with dielectric guides Expired - Lifetime US2129714A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US43795A US2129714A (en) 1935-10-05 1935-10-05 Wave type converter for use with dielectric guides
GB26068/36A GB468548A (en) 1935-10-05 1936-09-25 Improvements in or relating to high frequency signalling systems or apparatus
FR818503D FR818503A (fr) 1935-10-05 1936-10-03 Systèmes de signalisation à hautes fréquences
DEI56087D DE738361C (de) 1935-10-05 1936-10-05 Dielektrischer Wellenleiter
NL47517D NL47517C (enrdf_load_stackoverflow) 1935-10-05 1936-10-05
US133810A US2180950A (en) 1935-10-05 1937-03-30 Guided wave transmission
GB2808/38A GB491196A (en) 1935-10-05 1938-01-28 Improvements in or relating to high frequency signalling systems or apparatus
NL49995D NL49995C (enrdf_load_stackoverflow) 1935-10-05 1938-03-29
FR49564D FR49564E (enrdf_load_stackoverflow) 1935-10-05 1938-03-29
FR49566D FR49566E (fr) 1935-10-05 1938-05-18 Systèmes de signalisation à hautes fréquences

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43795A US2129714A (en) 1935-10-05 1935-10-05 Wave type converter for use with dielectric guides
US133810A US2180950A (en) 1935-10-05 1937-03-30 Guided wave transmission

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US2129714A true US2129714A (en) 1938-09-13

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US43795A Expired - Lifetime US2129714A (en) 1935-10-05 1935-10-05 Wave type converter for use with dielectric guides
US133810A Expired - Lifetime US2180950A (en) 1935-10-05 1937-03-30 Guided wave transmission

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US133810A Expired - Lifetime US2180950A (en) 1935-10-05 1937-03-30 Guided wave transmission

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DE (1) DE738361C (enrdf_load_stackoverflow)
FR (3) FR818503A (enrdf_load_stackoverflow)
GB (2) GB468548A (enrdf_load_stackoverflow)
NL (2) NL47517C (enrdf_load_stackoverflow)

Cited By (134)

* Cited by examiner, † Cited by third party
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US2439285A (en) * 1945-08-01 1948-04-06 Us Sec War Wave guide mode transformer
US2453760A (en) * 1945-03-02 1948-11-16 Bell Telephone Labor Inc Cavity resonator
US2455158A (en) * 1944-08-15 1948-11-30 Philco Corp Wave guide coupling device
US2472213A (en) * 1945-10-03 1949-06-07 George E Hulstede Antenna system
US2476034A (en) * 1945-07-16 1949-07-12 Bell Telephone Labor Inc Conformal grating resonant cavity
US2540839A (en) * 1940-07-18 1951-02-06 Bell Telephone Labor Inc Wave guide system
US2544923A (en) * 1942-05-07 1951-03-13 Csf Device intended for the transmitting of energy by means of a hollow electromagnetic guide
US2560353A (en) * 1945-03-16 1951-07-10 Bell Telephone Labor Inc Cavity resonator
US2567210A (en) * 1947-07-23 1951-09-11 Sperry Corp Ultra-high-frequency attenuator
US2584717A (en) * 1945-11-28 1952-02-05 Westinghouse Electric Corp Method of forming a cavity resonator
US2593155A (en) * 1947-03-07 1952-04-15 Bell Telephone Labor Inc Cavity resonator
US2611087A (en) * 1946-01-29 1952-09-16 Alford Andrew Device for radiating circularly polarized waves
US2656513A (en) * 1949-12-29 1953-10-20 Bell Telephone Labor Inc Wave guide transducer
US2706278A (en) * 1948-07-19 1955-04-12 Sylvania Electric Prod Wave-guide transitions
US2735092A (en) * 1955-04-04 1956-02-14 Guide space
US2762981A (en) * 1951-11-10 1956-09-11 Bell Telephone Labor Inc Mode conversion in wave guides
US2779923A (en) * 1946-05-06 1957-01-29 Edward M Purcell Mode transformer for wave guides
US2816271A (en) * 1950-11-22 1957-12-10 Gen Electric Microwave mode converter
US2963662A (en) * 1960-12-06 Sampling device for teoi mode in
US3002163A (en) * 1960-01-08 1961-09-26 Polytechnic Inst Brooklyn Mode coupler for circular waveguides
US3136965A (en) * 1960-09-22 1964-06-09 Boeing Co Electromagnetic wave guide of lunate cross section
US4673946A (en) * 1985-12-16 1987-06-16 Electromagnetic Sciences, Inc. Ridged waveguide to rectangular waveguide adaptor useful for feeding phased array antenna
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DE738361C (de) 1943-08-12
FR818503A (fr) 1937-09-30
NL47517C (enrdf_load_stackoverflow) 1939-08-15
GB468548A (en) 1937-07-07
FR49566E (fr) 1939-05-11
GB491196A (en) 1938-08-29
FR49564E (enrdf_load_stackoverflow) 1939-05-11
US2180950A (en) 1939-11-21
NL49995C (enrdf_load_stackoverflow) 1940-10-15

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