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Патент USA US2405519

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Aug. 6, 1946.
J. A. RAJCHMAN
, 2,405,519
FREQUENCY MULTIPL‘IER
Filed April 30, 1942
Gttorneg
Patented Aug. 6, 1946
STA E
2,405,519
FREQUENCY MYULTIPLIER
Jan A. Rajchman, Philadelphia, Pa., assignor to
Radio Corporation of America, a corporation
of Delaware
Application April 30, 1942, Serial No. 441,168
2 Claims.
1
.
This invention .relates generally to frequency
multiplier-s and particularly to apparatus in which
frequency multiplication is obtained by control
of an electron beam in a cathode ray tube Where
by the frequency of a voltage impressed upon the
de?ecting elements of such a tube may be'mul~
(Cl. 315—5)
2
from the battery or other source 3, through a
variable resistor t. Electrons emitted from the
cathode 5 are accelerated and focused by the
anode 6, which is vconnected to a point on the
voltage divider 93, connected across the source
tiplied to any other desired frequency, harmonic
of high potential M. A grid-aperture electrode
l I, connected to a source of negative potential is
or otherwise.
The invention is an improvement on the sys
disposed between the cathode and anode to. con
?ne the electron beam to useful proportions.
tem described in 'U. S. Patent 2,086,994 granted
Horizontal and vertical de?ection elements 1' and
to John Evans on July 13, 1937, in that the in~
8 are connected to a source of phase quadrature
stant invention is adapted more efficiently to de
currents which are derived from a source of os~
rive extremely high output frequencies. The in
cillation-s H! of the fundamental frequency to be
vention has particular utility in the generation
multiplied. An accelerating electrode l2, which
of ultra high frequencies where an economical 15 is optional, is connected to a second positive point
system of satisfactory frequency stabilization is
on the voltage divider iii. A disc shaped elec
desired. It permits the use of a crystal controlled
trode l5, having a plurality of apertures 25 of
oscillator, or other generator, of a fundamental
predetermined size, shape and relative spacing,
frequency which can be accurately regulated, and
is placed in the path of the deflected electron
the development of oscillations of any desired 20 beam in such a manner that the apertures in
multiple of the fundamental frequency. The de
terrupt the beam a predetermined number of
sired factor of frequency multiplication is ob
times during each rotation of the beam by the
tained by suitable design of one of the electrodes
deflecting voltages.
of a cathode ray tube. Likewise, the wave form
In order to converge the path of the interrupt
of the multiplied frequency may be controlled by ' ed rotating beam to a small cross sectional area,
the design of the multiplying electrode.
the electrostatic focusing elements it, I1, and
The use of a cathode ray tube for frequency
it, which are connected respectively to proper
multiplication is highly desirable since thg elec~
points on the voltage divider l3, are disposed in
tron beam is substantially devoid of inertia and
axial relation with the electrode l5. The con—
therefore enables the generation of extremely 30 stantly interrupted beam is thereby focused
high output frequencies. Energy may be applied
through an aperture 22 of a cavity resonator
to the de?ection elements of a cathode ray tube
electrode it) to the small target electrode 2i.
to produce a beam trace of any desired form and
Suitable coupling means 233 are provided for
having any desired speed of rotation.
deriving energy for the load circuit 23 from the
Among the objects of the invention are to pro 36 resonant electrode i9, which may be in the form
vide an improved frequency multiplier of the
of a cavity resonator of the type well known in
cathode ray type in which any desired factor of
ultra high frequency generators. The cavity res
multiplication may be obtained. Another object
onator l9 and the target electrode 2| are con
of the invention is to provide an improved fre
nected to suitable biasing potentials from the
quency multiplier in which currents of consider 40 voltage divider G2.
able amplitude may be generated at ultra high
The invention has a distinct advantage over
frequency. Still another object of the invention
previously known devices in that the cavity res,
is to provide improved means for stabilizing ultra
onator and target electrodes have extremely low
high frequency currents.
capacitive coupling with respect to the other elec
The invention will be more clearly understood 45
trodes in the tube, thereby providing eflicient op
upon reference to the drawing in which Fig. l
eration at extremely high frequencies. The par
is a schematic diagram of a preferred embodi
ticular
arrangement has the additional advantage
ment of the invention, Figs. 2 and 3 are schematic
that the A. C. component of the output frequency
diagrams of modi?cations of the invention, and
Figs. 4 and 5 are plan views of apertures of dif 60 may be derived from the coupling circuit 28, as
sociated with the cavity resonator i9, and the
ferent shapes which may be employed in the in
D. C. component may be con?ned to the circuit
vention.
including the target electrode 2|. If desired, a
Referring to Fig. l, a cathode ray tube having
an envelope i includes an electron emissive cath
load 23' may be connected simultaneously with‘
ode 5 and a heater 2 which is supplied with power 55 said load 23, for example, by opening the switch
2,405,519
I)
24, in the circuit connecting the voltage divider
l 3 and the target electrode 2 l .
With the apparatus just described it is perfect
ly practicable to apply a stabilized frequency of,
for example, 100 megacycles to the beam de?ec
tion elements ‘I and 8. By providing 100 apertures
in the electrode l5, it is possible to derive an out
put of 10,000 megacycles from the coupling cir
4
provide desired wave shape for the output fre
quency. Heretofore, the control of the wave
shape of currents of ultra-high frequency has fre_
quently involved a serious loss in e?iciency. ‘This
disadvantage is substantially reduced with the
system described. Of course, if the output fre
quency is extremely high, considerable di?iculty
may be encountered in coupling e?iciently to the
cuit 20. If the frequency multiplication is of a
cavity resonator l9 insofar as harmonic com
low value, the resonant electrode may be omitted, 0 ponents of the output frequency are concerned.
and the output frequency derived directly from
I claim as my invention:
1. A signal frequency multiplier including a
the target electrode 2|.
Fig. 2 is a modi?cation of the system described
cathode ray device having means for generating
by reference to Fig. 1 in that a magnetic focusing
an electron beam, an electrode having a plurality
element 26 is substituted for the electrostatic fo 15 of apertures in thepath of said beam, beam de
?ecting means responsive to said signal for scan
cusing elements I6, I‘! and IS. A‘ suitable source
ning said apertures, a relatively small target elec
of power 21 is connected to the winding of the
element 26.
trode, a cavity resonator disposed between said
Fig. 3 is a further modi?cation of the system of
apertured electrode and said target electrode,
Fig. 1 in that‘ horizontal and vertical de?ection 20 means for converging and directing said beam
from said apertured electrode through said cavity
elements 36 and 31 are substituted for the elec
trostatic focusing elements Hi, I‘! and I8, and so
resonator to said target electrode, means for de
riving energy from said cavity resonator in the
connected to the source of oscillations lB that the
original de?ection of the beam is effectively neu
form of alternating currents, and additional
tralized, and the interrupted beam made to con 25 means for simultaneously deriving energy from
verge to the small cross-sectional area required
said target electrode in the form of pulsating di
for the small target electrode 2 l.
rect currents.
Figs. 4 and 5 are illustrative of the versatility
2. Apparatus as claimed in claim 1 wherein said
of the invention in that various shapes and
apertures in said apertured electrode are substan
spacing of the apertures 25in the electrode l5, 30 tially square in shape and wherein said beam is
may be combined with predetermined electron
directed diagonally across each of said apertures.
beam cross-sectional dimensions E’, E", which
JAN A. RAJ CHMAN.
may be derived in any well known manner, to
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