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Патент USA US2409641

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Oct 22, 1946. >
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POWER CABLE magma FREQUENCY OSCILLATORS
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Filed Sept.- 18. 1942'
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COPPER
Inventor:
Frank J. Moles,
by
I
JAM
His Attorney.
Patented Oct. 22, 1946
2,409,640
UNITED STATES PATENT OFFICE
2,409,640
POWER CABLE FOR HIGH-FREQUENCY
OSCILLATORS
Frank J. Moles, Schenectady, N. Y., assignor to
General Electric Company, a corporation of
New York
Application September 18, 1942, Serial No. 458,821
'
4 Claims.
(01. 178-44)
2
1
My invention relates to cables and particularly
and
as a
The
sion
to cables adapted for use in the power supply cir
cuits of short wave electron discharge apparatus,
such as oscillators, ampli?ers, and the like.
It is an object of my invention to provide an
improved cable which has both high attenuation
at short wave length and has low distributed
the concentric transmission line 25 serving
handle to adjust the position of the ring 23.
coupling loop 26, at the end of the transmis
line 25, extends into the cavity between the
conductors l5 and I6 and provides a means for
abstracting high frequency energy from this cav
ity when it is in excited condition.
The extremities of the conductors l4, l5 and
I6 which are remote from the base part 2|, are
capacity.
Another object of my invention is to provide
a cable which may be manufactured at a low cost, 10 provided respectively with the ?nger members 21,
28 and 29 for engagement with the metal disks
which is easily constructed from available mate
rials and may be applied to existing high fre
quency oscillators.
The features of my invention which I believe to
3B—32, disk 36 being connected to the anode l9,
disk 3| to the control electrode l8 and disk 32
to the cathode 20. The insulators 33 of any
be novel are set forth with particularity in the 15 suitable insulating material, such as glass, pro
vide means for insulating‘the respective elements
appended claims. My invention itself, however,
of the device IT and holding the disks 3ll--32 in
together with further objects and advantages
spaced relation. The metal ?ngers 21 are sepa
thereof, may best be understood by reference to
rated from the conductor 16 by a sleeve 34 of any
the following description taken in connection with
the accompanying drawing in which Fig. 1 shows 20 suitable insulating material.
The cathode 29 is indirectly heated by the ?la
an ultra high frequency oscillator employing the
ment 35, current for ?lament 35 being supplied
cable of my invention and Fig. 2 shows a pre
through the inner conductors of the cables :2
ferred embodiment of my high frequency cable.
and i3. Operating potential for the anode I9 is
Referring to the drawing, I have illustrated my
improved cable as employed in the power supply 25 supplied over the inner conductor of the cable I |
conductively connected to the rod-like member
circuits of an ultra high frequency oscillator l9
38 having ?ngers 31- for engagement with the
which is shown to be of the resonant cavity type
anode [9. The insulating sleeve 38 is provided
and to which operating potentials are supplied
to insulate the end member 2| from the high
by means of the power leads H—|3.
potential present on the rod member 36.
.
Since the particular form of the ultra high fre
End member 39, engaging the bottom of tube
quency oscillator [0 forms no part of the present
H, is provided to securely hold tube IT in a fixed
invention, its structure and operation will not be
position in the oscillator and to adjust the pres
described in detail. Brie?y, the cavity oscillator
sure of ?ngers 2'l—29 on disk 3B—32. Insulator
i0 employs three telescoped and radially sepa
40 of rubber, or any similar material, prevents
rated conductors ill-J6 which de?ne concentric
lateral displacement of tube H. The cavity res
space-resonant cavities between them. These are
onator and discharge device described above are
used in combination with an electronic tube I‘!
not my invention and are fully described and
having its control electrode l8 coupled to the
claimed in copending Beggs application Serial
intermediate conductor l5 and its anode l9 and
cathode 26 coupled respectively to the remaining
40
No. 436,633, ?led March 28, l942,,and copending
Jensen et al. application Serial No. 448,206, ?led
June 24, 1942.
In the operation of the oscillator thus far de
either of metal or of insulating material. By vir
scribed when the cathode 20 is heated by the
tue of their'mutual spacing, the conductors pro
vide, in effect, a pair of concentric transmission 45 ?lament 35 and high positive potential is sup—
plied to the anode I9, since the grid and cathode
line sections, each of which by proper termina
operate at the same potential for unidirectional
tion can be made to function as an oscillatory cir
current, current flows between the anode l9 and
cuit having a, particular resonant frequency. The
the cathode 20. Assuming proper tuning of the
movable short-circuiting rings 22 and 23 are pro
vided for adjusting the length of these lines. 50 inner and outer transmission line sections, that
is by proper adjustment of the shorting rings 22
Annular metal short-circuiting rings 22 and 23,
and 23, high frequency oscillations may be de
each of which contacts a pair of the conductors
veloped. The sleeve of insulation 34 serves to
l4—l6, are provided to adjust the length of the
isolate the conductor [6 from the high unidirec
transmission line in question, the handles 24 be
ing provided to adjust the position of the ring 22 55 tional potentials present on the anode I9 and.
conductors. At their upper ends the conductors
are secured to a common base 2|, which may be
2,409,640
3
4
also serves capacitively to couple conductor l6
and the anode IQ for high frequency voltages.
As mentioned previously, the control electrode It
decibels per inch and a distributed capacity of
about 12 micromicrofarads per foot. Thus, a ca
ble constructed as above described is well adapted
for attenuating such high frequencies and at the
same time keeping a relatively low distributed
capacity on the power lead.
It is apparent that various modi?cations of the
above-described cable may be made. Thus, where
a ?exible cable is not required, a rigid wire may
and cathode ‘it are operated at the same poten~
tial for unidirectional voltages and for high frequency currents at a potential determined by the
tuning of the transmission line comprising the
conductors M and I5.
In the operation of an oscillator of this type,
considerable difficulty has been experienced in 10 be used as the conductor 55 and a copper tube
con?ning the high frequency energy to the
as the sheath 5!. Also, any ?nely divided metal,
resonant cavities of the oscillator and the oon~
other than steel wool, having a relatively high
centric transmission line 25 and in preventing this
resistance as compared With the resistance of
high frequency ‘energy from ?owing over the
conductors 50 and 5|, may be used as the ?lling
power leads ll-IS. Such leakage of high fre
material 52. In particular, stainless steel has the
quency energy results both in the occurrence of
qualities desire for material 52. Thus, while I
undesirable currents of high frequency in the
have shown a particular embodiment of my in
power supply and any outside measuring circuits
vention, it will of course be understood that I do
and in a reduced output and efficiency of the
not wish to be limited thereto since various mod
oscillator.
20 i?cations may be made and I contemplate by the
In order to prevent the leakage of high fre
appended claims to cover any such modi?cations
quency energy over the power leads supplying
as fall within the true spirit and scope of my
low frequency energy to an oscillator, such as
invention.
the oscillator in, in accordance with my inven
What I claim as new and desire to secure by
tion the cable illustrated in Fig, 2 is provided.
Letters Patent of the United States is:
This cable comprises the inner conductor 55 and
l. A ?lter for removing high frequency oscil
the outer conductor or sheath 5|, both conduc
lations from a power lead comprising a conduc
tors being preferably of a low resistance mate
tive sheath surrounding said lead and spaced
rial, such as copper. As shown in Fig. 2, the
therefrom, a mass of metal ?bers having a rela
outer conductor 5| is in spaced relation with 30 tively high resistance disposed in the space be
respect to the inner conductor 5|! and the space
tween said lead and said sheath, and means for
between these conductors is ?lled with a mass
insulatingr said metal from said lead and said
of ?nely divided, or ?brous, conductive material
sheath whereby power currents of low frequency
of relatively high resistance, such as steel wool.
may be transmitted over said power lead without
The high resistance material 52 is insulated from ' attenuation by said ?lter while high frequency
the conductor 50 by the insulating sleeve 53 and
currents transmitted over said power lead are
from the sheath 5|, by the insulating sleeve 54.
In the use of a cable of the type shown in Fig.
2 with power leads connected to a high frequen
cy oscillator, the inner conductor 50 provides a
low resistance path for the power current, while
the ?nely divided metal ?bers 52 surrounding the
insulating conductor 50 act as a large number of
mutually coupled circuits having high resistance
to the high frequency currents ?owing in them.
This material 52 of the cable thus dissipates the
highly attenuated.
2. In combination, a low resistance conductor,
a low resistance sheath surrounding said conduc
tor and in spaced relation therewith, a continu
ous layer of ?nely divided metal of relatively high
resistance disposed in the space between said
conductor and said sheath, and means insulating
said metal from said conductor and said sheath
whereby power currents of low frequency may be
transmitted over said conductor without attenu
high frequency energy which otherwise would es
ation while high frequency currents transmitted
cape to outside measuring circuits and the po
over said conductor are highly attenuated.
tential source. The insulating sleeves 53 and 54
3. A cable for supplying low frequency cur
maintain a relatively low distributed capacity in 50 rents to a high frequency oscillator comprising a
the cable.
low resistance conductor, a conductive sheath
In connecting the cable II to the oscillator Hi,
surrounding said conductor and in spaced rela_
the inner conductor '59 is directly connected to
tion therewith, and a ?lling of steel wool disposed
the rod member 35, while the outer sheath 5| is
in the space between said sheath and said con
secured to the end member 2| in any suitable
ductor, said steel wool being insulated from said
manner, such as for example, by soldering. Sim
sheath and said conductor.
ilarly, in connecting the cables !2 and I3 to the
A ?lter for removing high frequency oscil
leads of the ?lament 35 through suitable open
lations from a power lead operating at a poten
ings in the end member 39, the outer sheath 5| is
tial difference with respect to ground compris
secured to the end member 39 While the insu 60 ing a grounded conductive sheath surrounding
lating sleeve 53 serves to insulate conductor 58
said lead and spaced therefrom, a compact mass
from the end member.
of ?bers of a relatively high resistance metal dis
In operation it has been found that only a rel
posed in the space between said lead and said
atively short length of cable is needed to get de
sheath, and means for insulating said metal fi
sired attenuation at very high frequencies, Thus,
bers from both said lead and said sheath where
with an oscillator operating at 3000 megacycles,
by power currents of low frequency may be trans
a cable constructed of a fabric insulated 40-mil
mitted over said power load without attenuation
wire as the conductor 50, a it; inch layer of steel
wool as the ?nely divided metal 52, an impreg
nated cambric as the insulating sleeve 54, and a
1/; inch copper braid as the outer conductor 5|
was observed to have an attenuation of about 3
by said ?lter while high frequency currents trans
mitted over said power lead are highly attenu
ated.
FRANK J. MOLES.
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