US2066674A - Multistage ultra high radio frequency amplifier - Google Patents

Description

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F. W. DUNMORE ET AL MULTISTAGE ULTRAHIGH RADIO FREQUENCY AMPLIFIER Filed Dec. 27, 1935 3 Sheets-Sheet l PT M DUNMO/PE A. 1.. HUQNEfi HTTOIP/Vfy jam 5, 1193?. F. W. DUNMORE ET AL m a MULTISTAGE ULTRA HIGH RADIO FREQUENCY AMPLIFIER Filed Dec. 27, 1935 5 Sheets-Sheet 2 hm, 137 DUNMORE ET AL 2,@@,@74

MULTISTAGE ULTRA HIGH RADIO FREQUENCY AMPLIFIER Filed Dec. 27, 1935 5 Sheets-Sheet 5 W m ws'n'roms 1-? W nwwwomf 1.; 1.. HuQ fi' FTTO/PNE'V Patented it... 5, 1 937 UN ES PATENT OFFICE" MULTISTAGE ULTRA HIGH RADIO FREQUENCY AMLIFIER tary of Commerce Application December 27, 1935, Serial No. 56,350 9 Claims. (Cl. l'l9--1"l1) (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 757) This invention relates to an arrangement of concentriclines of multistage ultra high radio frequency amplifiers.

The invention described herein, if patented, may be manufactured and used by orfor the Government for governmental purposes without the payment to us of any royalty thereon.

The structure about to be described is designed as a practical physical embodiment of the electrical features disclosed and illustrated in the application of Francis W. Dunmore, filed December 27, 1935, Serial No. 56,349.

It is recognized as of great importance that the wiring to various tube elements in ultra high radio frequency circuits be reduced to a minimum. length, and the object of this invention primarily is to accomplish this, which we do by arranging the axes of the concentric lines in parallel planes about a common center, or in as close proximity to a common center as is substantially feasible, the arrangement also reducing the over-all dimensions of the amplifier to a minimum.

It is to be understood that these drawings are for the purpose of illustration only and are not designed for a definition of the limits of our invention.

In the drawings- Figure 1 is a perspective view of an ultra high radio frequency amplifier constructed in accordance with our invention, the concentric trans mission lines being arranged in a circle about a common center.

Figure 2 is a similar view of the lower portion or frame of the amplifier, or that portion that contains the electron tubes, shielding partitions, etc., when disposed in accordance with the arrangement shown in Figure 1.

Figure 3 is a bottom view which is more or less diagrammatic showing the concentric lines in rectangular arrangement.

Figure 4 is a view showing the same arrangement of lines as in Figure 3, there being shown a supporting plate for the outer ends of the concentric lines.

Figure 5 is a vertical section of a portion of one of the concentric lines, intended to show the manner of operating the tuning plunger in the line.

Referring to Figure 1 of the drawings, wherein there is shown a 4-stage amplifier, numerals I, 2, 3, 4, and 5 designate, respectively, the concentric line tuning impedances arranged about a common center, the central point in the arrangement being occupied by a central shielding tube or cylinder 6 for the reception of a voltage divider or power pack. The concentric lines l-5 and the power pack tube 6 aresupported at their lower ends in circular openings 1 in a frame 8 which will be described in a little more detail later on, the frame being surrounded by a shielding cover 9, there being provided a suitable bottom plate lil,having legs i l to raise the amplifier the desired distance above its support. These lines l-S and tube 6 are supported at their upper ends in openings l2 in a disk I3, the lines being fitted with similar caps l4 and the power pack with a cap l5. Each of the caps of the concentric lines is provided with two diametrically opposite holes l8 for the passage of con- .trol rods ll of insulating material, which rods are secured at their lower ends to a tuning plunger l8 best shown in Figure 5, and by means of which rods, as will appear, the plunger is moved with relation to the elements that are included in each concentric line or line assembly. We have mentioned the outer element of the concentric line and this is the outer tube of each line such as l-5. The other concentric line element designated by the numeral I9 is a tube around which the plunger l8 fits, and upon which it slides for the purpose of varying the electrical length of the concentric line when moved by the control rods, as intimated.

Above the disk I3 is another disk with holes 2! therein for the passage of the control rods, and the ends of each pair of rods are connected by a cross piece 22 so that each pair will be moved in unison.

Around the periphery of the upper disk are provided radially threaded apertures extending from the periphery of the disk to the holes for the outer rod of each pair of rods, and set-screws 23 are in the apertures and arranged for engagement with a rod of each set by which, it is obvious, the rods may be fastened temporarily the disk E3 in any adjusted tuning position so that when the disk as a whole is raised or lowered, all the control rods, and consequently all the plungers, are moved accordingly in all of the concentric line tubes l-5, there being a knob 24 centrally located in the upper disk whereby after all tuning adjustments of the individual concentric lines are satisfactorily made, all of the control rods may be moved when the disk is moved. a

The tube or cylinder of the concentric line I is slotted, as indicated at 25, for the passage and movement of one of the input terminals 26 which is carried by an additional rod 21 of insulating material which extends through an opening in the top of line I, and through the plunger in said line, the arrangement being for antenna adjustments, the other input terminal being indicated by the numeral 28, Figure 1, the output terminals of the amplifier in the same figure, being designated by the numerals 29 and 30.

Since the invention here resides in the main in the novel arrangement of the concentric lines, used in ultra high radio frequency amplifiers, using quarter wave concentric line impedance couplings between the stages, with the wiring to the ultra high frequency parts of the circuit reduced to minimum length, it is not necessary to describe the various circuits and elements that go to make up such amplifiers.

Figure 2 is provided to give a general idea of the construction of the base of the amplifier that adapts it to receive the ends of the concentric line tubes, the power pack cylinder or tube, and the electron or vacuum tubes a, b, c, d, and e, and to give a clearer understanding of the modifications and arrangement of the lines as shown in Figures 3 and 4. The numeral 3| designates a plurality of shielding partitions radially arranged around the central well 32, and extending to the periphery of the frame 8. Each partition, with the exception of the one designated 33, has an opening 34 therein and other arrangements for the passage and support of the electron tubes tb-e, which in the assembled amplifier, are appropriately connected with the elements constituting the concentric lines, the shielding partition 33 serving with an adjoining partition 3| to form an extra shielding compartment for the detector output apparatus.

In Figures 3 and 4 what would correspond to the base in Figure l is designated by the numeral 35. This is a rectangular frame provided with interior shielding partitions 39, which, together with the top 40, ends 4|, sides 42 and bottom 43, form shielding compartments 44, 45, 46, 41, and 41 for amplifier elements that coact with the concentric lines I 5 and other essentials of the amplifier assembly. The compartment 48 at the corner of Figure 3 may be utilized for the elements of the output circuit of detector tube a, and the vacant space 48 in Figure 4 may be so used for the voltage divider or power pack.

In the arrangement shown in Figure 4, there is provided a supporting plate 49 for the outer ends of the lines, the plate itselfv being supported at any suitable distance from the shielding compartments, by a number of rods 50.

By referring to the more or less diagrammatic view, Figure 3, it will be seen that the manner of connecting the electron tubes 11, b, c, d, and e is suggested, there being centrally arranged in each of the outer concentric line tubes l-5 the inner concentric line tubes l9, Figure 5, upon which the plungers slide. The plates of the electron tubes are connected to the D. C. voltage wire by means of an insulated wire 5| that passes through the tube; whereas the lead or wire 52 to the control grid of the electron tubes are connected directly to the central line.

We claim:

1. A multistage ultra high radio frequency amplifier using plunger type tuned concentric transmission lines as coupling impedances between stages, with the longest axis of each line parallel to the longest axis of the other lines and equidistant from a common center, whereby the wiring to the various tube elements is reduced to a minimum.

2. A multistage ultra high radio frequency amplifier with plunger type tuned concentric transmission lines as coupling impedances between stages, with the longest axis of each line parallel to the longest axis of the other lines and arranged about a common center, whereby the wiring to the various tube elements is reduced to a minimum.

3. A multistage ultra high radio frequency amplifier with plunger type tuned concentric transmission lines as coupling impedances between stages, with the longest axis of each line parallel to the longest axis of the other lines, whereby the wiring to the various tube elements is reduced to a minimum.

4. A multistage ultra high radio frequency amplifier with variable length concentric transmission lines as coupling impedances between stages, with the longest axis of each line parallel to the longest axis of the other lines and equidistant from a common center about which is disposed a shielding compartment containing the wiring to the various electron tube elements whereby the wiring to the said elements is reduced to a minimum.

5. A multistage ultra high radio frequency amplifier with plunger type tuned variable length concentric transmission lines as coupling impedances between stages with the longest axis of each line parallel to the longest axis of the other lines, whereby the wiring to the various tube elements is reduced to a minimum.

6. A multistage ultra high radio frequency amplifier with plunger type tuned concentric transmission lines as coupling impedances between stages, with the longest axis of each line parallel to the longest axis of the other lines and equidistant from a common center, and with one end of each line terminating in a separate shielding compartment, whereby the wiring to the various tube elements is reduced to a minimum.

7. A multistage ultra high radio frequency amplifier with plunger type tuned concentric transmission lines as coupling impedances between stages with the longest axis of each line parallel to the longest axis of the other lines and with one end of each line terminating in a separate shielding compartment, whereby the wiring to the various tube elements is reduced to a minimum.

8. In a multistage ultra high radio frequency amplifier with each stage having an input and output circuit, the combination of concentric transmission lines as interstage coupling impedances consisting in each interstage of a concentric transmission line comprising an outer grounded tube and an inner concentric tube with the longest axis of each inner tube parallel to the longest axes of the other inner tubes and equidistant from a common center, plunger type tuning means associated with each inner tube and. movable along its length, additional means associated with each inner tube for supplying the input and output circuits of each of said amplifier stages with the proper direct current voltages, whereby the wiring to each of said input and output circuits is reduced to a minimum.

9. In a multistage ultra high radio frequency amplifier with each stage having an input and output circuit, the combination of concentric transmission lines as interstage coupling impedances consisting in each interstage of a concentric transmission line comprising an outer grounded tube and an inner concentric tube each of said amplifier stages with theproper diwith the longest axis of each inner tube paralrect current voltages, whereby the wiring to lei to the longest axes of the other inner tubes, each of said input and output circuits is reduced plunger type tuning means associated with each to a minimum.

inner tube and movable along its length, addi- FRANCIS W. DUNMORE. 5 tional means associated with each inner tube LEO L. HUGHES.

i'or supplying the input and output circuits of

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