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Патент USA US2408904

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'Oct- 8, 1946-
'
O. HIBlGGé ETAL
ULTRA HIGH FREQUENCY GENERATOR
Filed June 12, 1943'
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_2,408,903
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ORRICK H. 61 Gas‘
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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.
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