Патент USA US2408904код для вставки
'Oct- 8, 1946- ' O. HIBlGGé ETAL ULTRA HIGH FREQUENCY GENERATOR Filed June 12, 1943' ‘ MID-=1 1' / _2,408,903 ’ z'sneets-sheet 1 I . 7 ‘ k j ' I v ORRICK H. 61 Gas‘ ' fig-‘56" ‘ v HAROLD Hams v INVENTORS Oct. 8, 1946. O. H_ BlGGs ETAL I 2,408,903 ULTRA HIGH FREQUENCY GENERATOR Filéd June 12, 1943 2 Sheets-Sheet 2 ORRICK H. BIG-GS BY Hmom Hams ' - AT‘WRNEY ‘ 2,408,03 Patented Oct. 8, 1946 UNITED STATES PATENT orrics 2,408,903 ULTRA HIGH FREQUENCY GENERATOR Orrick H. Biggs, Beverly, and Harold Heins, Mar hlehead, Mass, assigncrs to Sylvania Electric Products Inc., Salem, Mass, a corporation of Massachusetts Application .lune 12, 1943, Serial No. 490,698 4 Claims. (Cl. 250—-27.5) 1 This invention relates to electrical devices with particular reference to the generation of ultra high frequency oscillations. An object of this invention is to provide im proved means and method in the generation of ultra high frequency oscillations. Another object is to provide a device for gen~ crating high frequency electrical oscillations, with 2 since such achievement depends on the accuracy of the metal forming processes. In a generator such as described, a current flow is set up between electrodes, and this ?ow is passed adjacent the oscillatory circuit to en ergize it into oscillation. This arrangement ordinarily operates with the current flowing past the mouth of an opening, the edges of which pick up the energy to set up means for adjusting said device to a particular 10 oscillations in the circuit. This has the disad frequency. vantage that much of the energy of the current Another object is to provide a device for gen flow does not affect the circuit. erating high frequency electrical oscillations, with The power ordinarily necessary to set up the means for producing increased strength in the current flow in such a generator is considerable, oscillations. and in many instances this is a real disadvan Another object is to provide a device for gen tage. erating high frequency electrical oscillations, with This invention obviates the above difficulties means for reducing the power input necessary to in that it provides means for adjusting the wave produce a particular strength of. oscillation. length of the output of the generator so that the Other objects, advantages, and features will be apparent from the following speci?cation taken 20 device may be formed to relative broad toler ances, and thereafter adjusted to the particular in conjunction with the accompanying drawings wavelength desired; in that it provides a grid ar in which: rangement in the oscillatory circuit to utilize more Figure 1 is a perspective in partial section, of a of the current ?ow; and in that it provides a grid generator unit for the embodiment of this in arrangement and bias to aid in setting up the 25 vention; current flow, making it possible to materially re Figure 2 is a schematic diagram of the basic duce the input power necessary to operate the operation of such a generator; generator. ‘Figure 3 is a view similar to Figure 2 showing The unit used to illustrate an embodiment of the use of grids in accordance with this inven this invention is shown in Figure 1, with a sche 30 tion; matic illustration of its operation shown in Fig Figure 4 is a schematic illustration of the fre ure 2. quency adjustment of this invention; The device is based on the Hertz oscillator prin Figure 5 is an enlarged partial view of the de ciple in which oscillation in an adjacent circuit vice of Figure 1, taken on line 5-5 of Figure 1; Figure 6 is a view in illustration of the relation of Figures 1 and 3 taken in part on line 6 of Fig ure 5; and ' Figure 7 is a view taken in part on line ‘I of Fig ure 5 in further illustration of the frequency adjustment of this invention. I In the generation of ultra high frequency elec causes like oscillation to be set up in a circuit of the general form of circuit l, Figure 2. In this device, a space current is made to flow between a pair of electrodes, of which the cath ode 2 is one, and the body 3 of the unit is the other. Circuits comparable to l, of 1Figure 2, are formed in the body 3, Figure 1, as cylindrical openings ti, having slotted openings 5 communi cating with a central, cathode containing open trical waves, a method is to set up oscillations in a small oscillatory circuit, and to pick up ultra ing in the body 3. The current flow is made to pass the outer high frequency waves from the ?eld thus set up 45 adjacent the oscillatory circuit. A device for carrying out such a method may be in the form of a generator unit in which the oscillatory circuit is formed by machining or mouths of the slotted openings 5, and this action sets up oscillations about the openings 42 com parable to those which would be produced in the Hertzian type circuit I, Figure 2. The current ?ow is thus controlled by setting other suitable metal forming operation. Such a 50 up a magnetic ?eld vertically centrally through circuit is capable of producing electrical waves the central opening of the body 3, with ?eld at a ?xed natural frequency, limited by the form, lines in substantial parallelism with the cathode dimensions, and electrical characteristics of the 2 and represented generally by arrows 6. The metal. It has the disadvantage that a partic path of current flow thus set up is generally in 55 ular frequency is dif?cult to achieve precisely, 2,408,903 3 the form of a spiral as at ‘I. This spiral ‘I shows only the main form of the current flow. Actually it is full of loops and whorls within the general path of flow; when oscillations are thus set up in the loop of circuit 1, or correspondingly, in the body 3 of the generator, about the openings 4, oscillatory ?elds are set up within the loop I and openings 4 and the impulses thereof are 4 ances and thereafter the unit made to produce a precisely particular frequency by bending the various thin portions of the ring l1. This ring is split at one point, as at Hi, to avoid the for mation of an undesirable closed circuit there through. Possible adjustments of the thin portions of ring I‘! are shown in Figure 7. In this ?gure picked up by pick-up loops 8 and 9 respectively. the member 20 represents one of the thin portions In the unit of Figure l the body 3 is enclosed 10 of the ring I‘! and the member 2| one of the by a top 9' and bottom l0 and in spaced rela peninsulas of the body 3 which the ring overlies tion with each. Thus the ?elds set up in the but does not touch. The slot 22 is formed in all openings 4 are coupled with each other and may the peninsulas and is for the reception and mount be picked off by the single loop 9 in one of the ing of the thick portions of the ring IT. openings 4. This loop is arranged at right angles 15 As in Figure 7, the preferable adjustment is to the lines of force of these ?elds for the maxi in the directions of the arrow 23, that is, verti mum pick-up e?ect. The lead wires for the oath cally or in substantial parallelism with the oath ode 2 are shown at H and I2 and for the pick ode 2. Lateral adjustment, as indicated by ar up coil 9, one lead is at I3, and the other is the rows 24 and 25, may readily be used, with slight surrounding sleeve I 4. Heat dispersing ?ns 15 20 ly less effect. In practice, a combination of ver are formed about the unit as shown in Figure 1. tical and lateral adjustment is commonly used. The feature of adiustability to a particular The ring I] need have no particular cross-sec wavelength is illustrated in Figures 4, 5 and '7. tional form. A circular cross section wire, for ex As previously stated, the generator of Figure 1 ample, may be used instead of the ring shown. will produce oscillations of a particular frequency, 25 'The features of increasing the strength of the as governed by the formed contour of the metal oscillations in the oscillatory circuits of this gen body. This frequency, however, may not be pre erator and of setting up the ?ow of current be cisely that which is desired, due to the natural tween the cathode 2 and body 3, are illustrated in tolerance limitations of forming tools and proc Figures 3 and 6 by use of grids 26 and 21 re esses. When this happens it becomes necessary 30 spectively. to vary the capacitance-inductance relation of the The grids 25 are mounted at the ends of the oscillatory circuits to bring about the precise pro oscillatory circuit I in Figure 3 to increase the duction of the frequency desired. effect of thecurrent ?ow, represented by spiral 1, This adjustment is schematically illustrated in in setting up oscillations in circuit I by increasing Figure 4, showing the oscillatory circuit I and il the interception of the current ?ow. lustrating by arrow I6 the action of varying the The grid 21 is cylindrical in form and posi spacing between the ends of the circuit l to vary tioned about the cathode 2 with a bias to aid the the capacitance therebetween and therefore the current flow from the cathode and thus reduce frequency characteristic of the circuit. This ad the power necessary to set up this current. justment feature is accomplished in the genera» The arrangement of these grids is shown in tor of Figure 1, through the use of a split ring Figure 6, with the grid 21 about the cathode 2 l1, Figures 5, 6, and 7, mounted on the body 3 and the grids 26 mounted as extensions of one in encirclement of the cathode 2. It may be of the slots 5 toward the cathode 2 and thus into seen that the slots 5 provide peninsular por the path of current ?ow as represented at 1 in tions [8 of the body 3 between the slots, and ad Figure 3. jacent peninsular portions e?‘ectively represent What I claim is: opposing plates of the capacitance of the oscil 1. An ultra-high frequency generator compris latory circuits de?ned by openings 4 and their ing: a radially-slotted annular conducting mem associated slots 5. ber having a concentric groove near its inner The split ring I‘! is formed in alternate sec- ' edge; a cylindrical cathode mounted inside said tions of vertically thin and thick portions with annular member, concentric therewith and spaced the thick portions engaging alternate peninsu therefrom; and a deformable ring in said groove las of the body 3, and the thin portions overly contacting alternate conducting pieces between ing but not contacting the other series or alter the slots. nate peninsulas. Thus the ring l1 contacts one 2. The combination of claim 1, and a concen peninsula, skips the next, contacts the next, and tric grid between the cathode and annular mem~ so on, so that for any two adjacent peninsulas, ber. the capacitance effect of the oscillatory circuit 3. The combination of claim 1, and grids ex of the opening 4 enclosed thereby, is in part rep tending radially inward from the edges of the resented by the spacing of the thin portion of slotted portions of the annular member. the ring I‘! from the peninsula which it overlies, 4. The combination of claim 1, in which the but does not touch. Thus bending of a thin deformable ring is split to avoid the formation of portion of ring I‘! would be comparable to the a closed circuit therethrough. adjustment indicated by arrow I6 in Figure 4. With this arrangement, the body 3 of the gen erator may be formed to relatively wide toler O. H. BIGGS. HAROLD HEINS.