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Патент USA US2110448

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March 8, 1938.
E. G. Ll NDER
OSCILLATOR
Filed Aug. 20, 1935
FMIAEGLTD/c’
2,110,448
Patented Mar. 8, 1938
UNITED STATES PATENT other I 1
2,110,448
OSCILLATOR
Ernest G. Linder, Surf City, N. J., assignor to
Radio Corporation of America, a corporation
of Delaware
Application August 20, 1935, Serial No. 36,974
(Cl. 250—36)
spacing between the two circuits. If the coupling
12 Claims.
My invention relates to oscillators. More spe
ci?cally, my invention is a multiple magnetron,
is too loose, the transfer of energy is inefficient.
If the coupling is too close, the currentsin the
separate resonant circuits will react deleteriously
or a multiple electronic ultrahigh frequency os
cillator.
_
I
on each other.
One of the objects of my invention is to ar
range a number of magnetron oscillators within
a common envelope.
the required e?iciency.
'
netron or electronic oscillators to a single reso
10 nant circuit to increase the power, developed
therein.
A further object is to connect a number of
ultra high frequency oscillators across a number
of nodal points in a resonant circuit.
.
.
Ultra high frequency oscillations have been
generated by magnetron and other types of elec
tronic oscillators. Although it has been feasible
20 to generate extremely high frequencies, it has
not been practical to generate large amounts of
oscillatory energy.
An increase in size of the
electronic tube elements increases their vinterelec
trode capacity and decreases their oscillatory
25 frequency. My invention overcomes these diffi
culties by connecting a number of ultrahigh fre
quency oscillators to a single tank or- resonant
circuit.
.
o
ber of half wave lengths.’ The dotted lines I‘!
represent the oscillatory voltage along a section l0,
of the tank circuit 13, and the polarities indicated
areinstantaneous values- Each ‘of the resonant
circuits H is symmetrically arrangedabout a‘
nodal point in the tank circuit and each of the
resonant circuits H is properly phased.
Other objects will appear in the accompany
ing speci?cation.
nected to the cathode 9 and its positive terminal
to the center of the nodal connection. l9, An
antenna 23 may be connected to the resonant ‘“
tank circuit (3.
>
,
tially parallel to their cathodes .9, the several
magnetrons will generate oscillations. The fre
quency of each of these oscillations is determined
by each of the several resonant circuits II and
the equation
’
v
H
I
Figure II is a detailed perspective illustration
of one of the magnetron oscillators and its mag
netic circuit, and
v
If a magnetic ?eld‘of suitable strength is ap
plied to each magnetron in a position substan
30 schematic diagram of one embodiment of my in
95
At a 15
nodal point a connection I9 is made to the par
allel wires of the resonant tank circuit l3. An
anode. battery 2! has its negative terminal con
_
In the accompanying ?gures, Figure I is a
vention,
‘
The tank circuit I3 is resonant to a whole num
Another object is to connect a number of mag
15
The coupling is determined by
the desired width of the transmitted band and
'
where x=wave length, 7c=a consta‘ntyand H=the
magnetic ?eld strength. Thus it will beseen that
each separate oscillator‘ is generating oscillations
Figure III is a diagram and a perspective show
ing of a positive grid oscillator which may be
which may be adjusted to the same frequency.
used in my invention.
the proper phaseinto the tank or resonant cir
_
In Figure I, within evacuated envelope I are a
plurality of high frequency oscillators'3. Each
40 of these oscillators consists of two anodes 5, 1
and a cathode 9. The cathodes may be ?laments
or the like and are energized in parallel or series
by any suitable source of current which is not
shown. vA resonant loop circuit “connects the
45 anodes 5 and 1. Each of the resonant circuits
l l is coupled to a resonant tank circuit [3, across
a nodal voltage point IS. The couplingbetween
3 and I3 is the common portion of the circuits.
Instead of coupling directly as shown, the several
50 resonant circuits 3 may be spaced from the single
tank circuit l3. In this case the positive connec
tion, represented as I9, must be made directly
The several separate oscillations’ may be fed in
cuit
I3.
'
.
>
The magnetic ?elds have been illustrated by
circular broken lines labelled magnetic ?eld in 40
Figure I. The ?elds may be created by a single
magnetic circuit having the required number of
pole pieces. I prefer to use several separate ?elds
or ‘adjustable pole pieces to facilitate individual
adjustment of the magnetrons. In Figure II a 45
magnetic ?eld structure of one type is shown.
A magnetic core 3| is energized by a solenoid
33 which is connected through arheostat 35 to a
battery 3?. The magnetic ?eld is established be—
tween the pole pieces N and S. The ?eld is sub 50
stantially parallel to the filament 39 of the mag-,
netron. The ?lament is energized by a battery
to each of the several resonant circuits 3 at their
4! or any suitable powerusource. , Adjacent the
mid-points. The coupling may be adjusted by
?lament or cathode 39 are the anodes 43, 45. . The
55 varying the length of the common portion. or the
anodes are preferablyshaped into a hollow half 5.5.
2,110,448
cylindrical i’orm whose central axis is substantial
ly coaxial with the cathode. The anodes are
6. In a device of the character described in
claim 4, a single evacuated envelope enclosing
connected by a link circuit 41 which is preferably
resonant. A wire or rod 49 represents a section
of the resonant tank circuit ll of Figure I. A
fragmentary portion of the evacuated envelope
which surrounds the magnetron has been shown
10
said plurality of positive grid oscillators.
'7. In an oscillatory system, a plurality of mag
netron oscillators, means for creating a magnetic
?eld for said oscillators, a separate resonant cir
‘ V cult connected to each of said magnetrons, a sin
to simplify the illustration. The anode battery
gle resonant circuit havingxa-ipluralityvoi' nodal
has
points, and means coupling each of said separate
resonant circuits across single nodal points on 10
been
omitted.
.
1
. ,
>
'
Although I have illustrated the oscillators as
magnetrons, any ultrahigh frequency generator; .7. said single resonant circuit.
may be employed. In Figure III a positive’ grid
‘ ‘8.. In an oscillatory system a plurality of elec
°s°mat°r is shown with the evacuated envelo‘hé. *mme oscillation generators, said generators each
in fragmentary form. A suitablev cathode¢5iis
including a single electronic oscillator and means
tioned around the grid and cathode.
fort-imparting anloscillatory movement to the
electronscreating‘said oscillations; a plurality of
circuits each connectedpto said generators and
15 energized by a battery 53. ‘Surrounding the
.- cathode is a grid 55. The anodes 51-59 are posi
The anodes’ .
are joined by a resonantjcircuit'tl.
The ‘reso
nant circuit is coupled to the tank circuit "163.
20
15
resonant to said oscillations; a single circuit res
onant to a; frequency which is a multiple oi’ the
This circuit is similar to the resonant tanlrjcir-v resonant, frequency of each of said plurality of 20
cult’ lat: Figure I. A bridging circuit 65 is con circuits and further characterized by its adapta
nected‘tofnodal‘ points on the tank circuit“; bility for' the’est'ablishment ‘therein of standing
The center of the nodal connection 65 is joined to waves of‘o'pposite phases including voltage nodal
a biasing battery 61. lThislbattery biases 'the and antinodal points; means for mutual coupling
25 anodes {either ' slightlyl positive or negative ‘ with‘ ' each‘lofisaid plurality of ‘circuits to'said single 25
respect to the cathode 5| ._ The grid 55 is con
nected to the positive terminal of a battery '69
and ‘the negative tenninal'of this battery is con
nected totthe nodal, connection. 65. ‘The ultra
30
high fi'requency ‘positive grid oscillator’ is [well
known‘ito those ‘skilled in the art. This oscilla
tor,jper‘ se, is not my, invention, and a detailed
description of 'thetheory' of operation is not _re-,
quired. ‘- It’shouldbe understood‘that the oscilla- .
35
tor of Figure In doesnot require a magnetic ?eld.
Theelementsjof the, positive grid or the magne
tron oscillator,:or;both, may be used as the sepa
rategener'atdrs- of‘oscillatlons shown‘ in Figure I.
40
I prefer to'have separate means for adjusting the
several‘v biases of: the. separate positive grid oscil
lators.
‘
'
_
q
'
tions’of voltage waves, of" opposite phase and a
single voltage nodal point‘, and whereby each said
generator impresses oscillations‘on'said single 30
circuit in phasal' relations which create ‘said
standingwaves, and a‘ single evacuated envelope
for enclosing said plurality of'generators and res
onant
circuits.
I‘
'
t
i
‘
,
_9. In; an oscillatory system a plurality of elec 35
tronic oscillationgenerators, said‘generators each
including'a single‘electronicoscillator and means
for imparting an oscillatory ‘movement to the
electrons creating said oscillations; a plurality of
circuits each‘ connected'to said generators and
_Vari_ousm_odi?cations may be made in my in
resonanttoa-whole number of half wave lengths
scope thereof, and I desire, therefore, that only
correspondingto the resonant frequency of each
of s'aid'plurality of circuits and further charac-'
45 such‘ limitations shall ' be placed thereon as are
necessitated ‘by thev prior, art and set forthin the
apb‘endedclaims'.
I'claim:
‘
'
.
"
"
I,
‘
'1"
p
..
‘-
“
v
v 1. In an oscillatory system, a plurality of mag
netron oscillators, a plurality of magnetic ?elds
for said oscillators, a separate resonant circuit
oonnected-to'each of said magnetrons,~a single
resonant- circuit [having a' plurality ofi'nodal
points,‘ and means coupling each of said separate
55. resonant. circuits across separate nodal points on
said single. resonant circuit.
'
.. 2. In j'atdevice :of the ‘Y character ‘described in
claim 1, means‘ for separately adjusting several of
saidplu-rality‘of-magnetic ?elds. '
40
resonant to '~ said oscillations; a single circuit
ventionjwithout departing from the “spiritand
60
circuit in aiserial arrayfwhereby each said mu
tual coupling includes in said single circuit por
1
3.? In: a ‘device of the character describedv in
claim'1,.an 'anten~na,-iand~means coupling said
antenna :to said- single resonant circuit.
, 14. ‘In an oscillatory-system,~a plurality of posi
tive'gridcoscillators, aplurality of resonant cir
65 cuits, 'means connecting-separate circuits of said
plurality or resonant ‘circuits to separate ' oscilla
> tors of'said plurality ofv oscillators, a single reso
terized bylits-adaptability‘for the establishment
therein-of standing waves of opposite phases in,
cluding voltage ~nodal' and antinodal points;
means, i'or‘mutual coupling} each of said plu-‘
ralit‘yr'of ‘circuits tosaid single circuit in a serial
array,‘ whereby each said mutual coupling in-‘
cludes in said single circuit portions of voltage
waves of ‘ ‘opposite ‘phase and a single voltage
nodal point-and whereby each‘ said generator im
presses oscillations on said single circuit in phasal
relations which create said standing waves, and
,a single evacuated envelope for enclosing said
plurality of generators and‘ resonant circuits.
10. In an oscillatory system, a plurality of elec
tronic oscillators including a single electronic os
cillator , and ' means
for
imparting
oscillatory 60
movements‘ to the .electrons in each of said os
cillators whereby oscillations of substantially the
same oscillatory frequency are created; a plural- ‘
ity 'ofresonant'circuits respectively connected to
said plurality/‘of oscillators; a_sing1e circuit ‘res 65
onant to a multiple of'said oscillatory frequency
‘and characterized byhaving a length adaptable
nantTcircuithavingi a numberof nodal points, for?th'e’creation of? standing potential waves of
and means "coupling said separate resonant cit-'7 opposite ” phase ‘and potential nodal points;
70 cults across. separate nodal points on‘ said reso
means for conductivel'y coupling each of said plu
nant/circuit. 1
-
A
'
.
"
.
5.5In a device 'oi'hthe'character described in
7 claim 4, a’numberof sources of voltage for bias
ing’i’or each of said positive grid oscillators and
15
means-for varying!said-biases.v
'
a
r
'
rality of circuits across/ditlerent sections of said
circuit wherebyr'said coupling includes portions
of said'potential. waves of opposite phase ‘and‘a
single .- potential "nodal point, and wherebyfsaid
plurality-'of'oscillators create and maintain said it
2,1 10,448
3
11. In an oscillatory system, a plurality of mag
netron oscillators, a’ plurality of magnetic ?elds
for said oscillators, means for imparting oscilla
tory movements to the electrons in said oscil
12. In an oscillatory system, a plurality of mag
netron oscillators, a plurality of magnetic ?elds
for said oscillators, means for imparting oscil
latory movements to the electrons in said oscil
lators, a separate circuit resonant to the period
of said oscillatory movements and connected to
each of said magnetrons, a single circuit resonant
lators, a separate circuit resonant to the period
to a multiple number of half wave lengths cor
standing waves in said single circuit; and an
evacuated envelope including said plurality of
generators and said circuits.
of said oscillatory movements and connected to
10 each of said magnetrons, a single resonant cir
cuit having a plurality of nodal points, and means
coupling each of said separate resonant circuits
across separate nodal points on said single res
onant circuit.
responding to said oscillatory movements and
having a plurality of nodal points, and means 10
coupling each of said separate resonant circuits
across separate nodal points on said single res
onant circuit.
ERNEST G. LINDER.
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