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Патент USA US2404363

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Juäy 23, ‘1946.’ l
G. P. cHEvlGNY
Filed March 16, 1942
- È!
Patented July 23, 4,1946
. i
Georges P. Chevigny, New York, N. Y., assigner to
Federal Telephone and Radio Corporation, a
corporation of Delaware
‘ Application March 16, 1942, Serial No. 434,914 .
6 Claims.
(Cl. Z50-27.5)
Fig. 2 is a sectional view taken substantially in
Th‘isinvention relates to electron discharge de
vices and circuits and more particularly to such
the plane 2-2 in Fig. 1; and
apparatus adapted to operate at ultra high fre
quencies. It has for its object to improve the
operating performance, and increase the fre
tion of the device shown in Fig. 1.
, „ ,
Fig. 3 is an alternative embodiment of. a por
, . _
The device shown in the drawing isa simple
triode having its output connection so provided
that it may be readily connected in av co-axial
quency and the power output at which such de
vices may be made to operate eifectively. A re
transmission line. The y arrangement further
lated object is to provide a simple compact con
permits provision of a pair of resonant cavities
struction, by which an eiiicient-operation is ob
tained. A further related object is _to provide~ an 10 between the grid and anode and between cathode
and grid. y The tube as shown comprises a double- -
improved form of such'» devices which will be read
ily adaptable for operation -with co-axial line
helix cathode l0 concentrically surrounded by a `
grid II v.and thenby an 'anode I2. For feeding
cathode heating voltage vto cathode I0 symmetri
There have heretoforefbeen provided vacuum
about the electricalmid-point th'ereof, a _rig-_
tubes having resonant cavity type circuits ar
id lead-in wire I3v is connected `rigidly to one end
ranged to establish ultra high frequency reso
of cathode I0 (at the> right _in the drawing).
nance. `At fthese frequencies, Vin order to avoid
I3 thus serves to support that end of
large inductances and distributed capacities, the
the cathode. The other respective ends of the
sizeof the electrodes should be 'made small in
cathode h'elices aresupported by two further
order‘that a substantial transfer of energy of th‘e 20 rigid lead-,in conductors. I4, I5, and all the cath?.r
ultra high frequency may-be made effective over
ode leadèinconductors I3, I4, and`l5_ are brought
the electrodev areas. Furthermore, it is desired
out of the evacuated >envelope'of the device
that the electrical impedance of the elements cou
through a glass press I6.
plingsthexesonant circuits-with the tube elec
Grid I I‘ comprises ,a plurality o_f longitudinally
trodes' should be made small in order‘to reduce 25 extendingr rods or wires (see r>also Fig. 2) rigidly
ñxed at one end to a collar I1 and at the other
In accordance with this invention there is pro
to a bellows I8, whereby changes in lengthV _of
vided a compact symmetrical arrangement of the
th'e grid'due` to heating in operation may bev ab-`
thezpowerloss acrossth'em.
component 4parts of the tube and cavity circuits, 30 sorbed by the device without displacing' the grid
which reduces the effective size ofthe electrodes
with respect to cathode I0 and anode I2 so as to
to’half their actual size,"and thereby permits a
high energy output ata very high frequency. kA
featurefisran arrangement'of the cavities> sym
metrically with respect'to the central section of 85
impair performance of the device. ‘Inlorder that
the electrodesïso ‘that the tubevoperates as two
tubes,‘one on' eitherside of the central section.
A further ffeatureis the formation offthe‘elec
trode‘s ,and the tube in -' such Ya- manner that two
separate resonant circuitsl maybe provided lbe
tweeng'rid and -anode‘and two further tuning '
connection may be made to the grid from both
sides of the anode, two annular lead-in members
I9, 20 are provided. _Members I9 and'Zû include
longitudinally extending iianges I9' and 20"’to
aid in sealing them to insulating portions ofthe
envelope. At the end of th'e device Wherethe
grid is held fixed, collar I'I is )provided with'a
radially extending- ñange 2Ifb'y means of which
collar |1` is rigidly ñxed by bolting va ring „22 _and
means may be provided betweenÍcathode and grid
.eircuits.`_ >In this manner, one tube may be made
to do `the work of two and increased power and
ñange 2l tothe annular member' I9.
bhigher operating frequencies may be obtained.
Other objects ‘and further features of novelty
bellows I8. 'I'he purpose Yof bellows I8 is to take
and 'invention -Willhereinafter be pointedy out or
will become apparent to those 'skilled in the art
from a readingrr of the "following specification in
connection withl the drawing annexed hereto.
In said drawing-`--
. Fig. 1 depicts a partly sectionalized andvbroken
'away'elevation Vo1? an electron discharge device
and its associated circuits in accordance with
l‘features of the invention;
` ~
'As' mentioned vaboveLthe other Vend o_f grid- II
isr connected to annularv member u20 through a
up with relative ease changes in lengthi of the grid
, in operation, and it' also serves to provide a highlyv
efficient conductive surface for direct connection
to annular member 20. It is accordingly >prefer
able that bellows I8 offer the Aleast possible r'eà
sistan'ce to changes in length of grid I|_ and, ac
cordingly, that it be made of very thin’m‘etal. If
desired, the disposition of4 all elementsîofwgrid f
I I may be still more securely maintained by pro
vidingl spring means 23 within bellows lßfwhere
by all th'e wires of grid II are constantly under a
certain amount 0f tension.
1 It will be noted that the arrangement thus far
described permits provision of an additional lead
single cathode, the eiïect of the symmetrical con
struction of the electrodes and resonant circuits
' is to cause the half of the apparatus to the right
of a center section through anode I2 to‘operate
as one device, and the other half as another de
in 24 for the mid-point of cathode- I!! whereby
cathode output from a radio frequency point of
vice in parallel,” as will be clear. Furthermore,
inasmuch as the elements constituting the active
of the tube asis also the case for grid connec
electron discharge portions of the tube may be
tions. Inasmuch as lead-in I3 supporting the
v'designed with relative compactness, a higher op
electrical mid-point o-f cathode III may extendr 10` erating frequency may be obtained. The rela
due toh'eating during operation, it is preferable ” ¿tively eiiicient disposition of the several resonant
that lead-in 24 include a ilexible (e.- gstranded)
circuits gives a maximum of access of outer por
portion, whereby no stresses will be set >up during Y VAtions ofthe anode to cooling media; and in order
view may be taken symmetrically from both ends
» . to increase effectiveness of such cooling, the Vouter
‘ Anode I2 has a rather extensive operating sur
15` periphery of-anode I2 may be provided with cool
` face concentrically surrounding the grid IIV and , .
eXtending a substantial distance therealong. In
the form shown, anode I2 further includes flanged
Figr3 illustrates another embodiment of the
portions I2’ similar to flanges I9' and 20' on
above-described tube. In this embodiment'a sin
gle cylindrical line 41 surrounds anode I2 andis
the annulargrid lead-ins.. >'I'he evacuatedpor
tion of the discharge device thus comprises press
coextensive with grid lines _29r and 32 as lines 28
and 3'I ,were with the same grid lines in Fig.; 1.
This arrangement thus provides a single tank ex
I6,Ã. annular grid lead-in_l 9, i insulating` collar p25
sealed to flangesïlß’ and I2',1anode I2, afu'r
ther insulating-collar 25 sealed to flangesI2’. and
20', gridlead-inZIl', and a further press 2'I` sealed
tothe other ñange20’, as will be clear,k
tending between both grid leadsV I9 and 20 _and
anode I 2. Y Coupling capacity between Vthevtank
and the anode may be provided by appropriately
. . -. _» .
`Ílît will be seenthat I have described a relative
ly »simple structure foruse inv connection >with co-`
axial transmission lines and resonant circuits of . -
. the transmission linetype. f Intheform 30
concentric linecomprising three cylinders 28,29.
30 may be connected Vto _oneend of .thetube and
ianother concentric line comprising-tubular con;
ductorsr3l, 32 and. 33 maybe connected-to the ~ i
other end thereof. , Lines 28,-'and3fl areshown
directly .connected `to anode . I2, , lines `29 .and> 32
view,V be rconsidered as two "separate Ydevices
. circuits described.> In the form shownQone'side
formed by dividing along themidsectionof the
anode. The ability to tune both cathode-grid
and grid-anode circuits symmetrically aboutthis
midsection permits all circuits to operate at> more ¿
elevated frequencies-that would otherwise be un
of the grid-anode circuitl may -betuned with
slideable capacitative tuning elements 3B, 3'!l and
_the other side'witha similar pair 38,> 39. >,These l
elements'may be jof known form. and slideable
pletely symmetrical device wherein> the half "to
`lIf desired, Atuning means may be providedto
tunevany _of the' grid-anode andV cathode-grid
shown) in line 41 and a draft rforced _there
one side of a_ midsection normal to the laxis of
the device may function symmetrically and ¿con
currently with the other half. VIn other _words „
the device could,A from y an electrical> point of
outer ends of cathode leads-inrIlI, I äïwith the
in this way these high potentials are, kept Voff ex
ternal elements of the'device. If desired., >the
anode may be cooled by providing longitudinally
extendingV slots or other apertures `(also #not
It is to be noted that II have described a com- ,
nection to theelectrical mid-point of cathode I0.
By-pass condensers 44, 4_5 are shown linking the
spacing that partof line V4‘I adjacent anode I2
therefrom.v High anode potential is supplied 'in
a well-known manner (notrshown)v through` a
glass bead insulator inthe surface of line 41 and
areconnected directly to the grid leads-in 20 and
I9 respectively, and linesr30 andk 33 are provided
with'end-plates 34 and 35 for symmetrical con
cathode line 33.
ing ñns, which, in the> form' shown, have been
» milled out, as Vat 42 and 43.
longitudinally between lines 28 and VV29,-and 3I
attainable.V 'rï’he'arrangements described possess
the'further advantage-over two separate tubes in
parallel and'intended for operation at the same
frequencies that the additional inductive and ca
and‘32, as the case may be. Y'These tuning means
are'shown- as capacitatively ,separated so that
pacitative _reactance that would necessarily be in
high B-supply lvoltages mayY be‘placed on the
troduced by so connecting two separate tubes
anode without affecting grid potentials, as Ywill
would _materially impair ability to reach those
be clear. .Y >Ii preferred, a relatively fixed capaci
' tativeponnection could be madev between line;28
frequencies-_at least with electrodes of the size
possible in accordance with the invention.
and'anode ¿I2 and between line 3! `and anode'IZ - '
so that a more rigid singleV conductive tuning ele
' Although'I haveV described myinvention in de
tail in connection with the preferred form shown,V
VVment could be used> instead of elements 3,6, 3;?, 60 it is clear that many modifications, additions and
38 and 39. 1 Connections of this latter nature are
omissions may be madewithin the 4scope Vand
shown in the copendingapplication Serial No.
spirit thereof as defined in the appended claims.
431,134.` filed February 14,V 1942 ofrE, Labin »and
myself. '_Further‘tuning means, which mayzbe
similarçto that used `in connection with the grid
anode circuit, „may be provided adjustably to tune
the- respective lcathode-grid circuits.- These fur
I 1 What is claimed is:
f 1. An ultra high frequency electron- discharge `
device comprising concentrically. mounted îcath
ode, grid and anode- electrodes,l the'anodelbeing
the .outer of Ísaid electrodes, anzevacuated enve
lope enclosing said cathode,v saidl .gridfand a
' are shown
adjustably slideable ,between lines
portion ofp said anode, an annular member of
70 conducting material passing through av portion
` Y29` and 30, and-32 and 33, as the-case. may be.
_ It will be seen that I have provided an-extreme
of said envelope on one side of said'anode,.a`v fur
lyguseful form of high‘frequency discharge device
ther annulary member of conducting.. material
Wherein'a singletube Ymay be employed effectively
passing through a portion of said'envelopeon
.tot deliver -the’power that would beexpected .of ' the other side of said anode, -lcìoth saidpannular
two former devices. Although there is only a
members being co-axially disposed with respect
ther tuningjmeans, designated generally 40,f4|,
to said electrodes and conductively connected
with said grid, and cavity resonator means ex
tending across outer portions of said annular'
members and outerportions of said anode.
2. An electron discharge device according to
claim 1, wherein said cavity resonator means in
cludes a ñrst cavity resonator connected between
said first-mentioned annular member and said
anode and a second cavity resonator connected
at one end directly to one of said annular mem
bers and wherein the other end thereof is con
nected to the other of saidannular members
through a bellows.
5. An electron discharge device comprising a
centrally positioned, , longitudinally extending
cathode, a tubular grid surrounding said cathode,
a tubular anode about said grid, means support
ing said electrodes, said means including a pair
between said further annular member and said 10 of longitudinally spaced plates, means rigidly at
taching one end of said grid to one of said plates
anode, said cavity 'resonators being generally
and a iiexible bellows forming a continuous con
symmetrically disposed longitudinally withre
ductive connection and a longitudinally extensi
spect to each other and also being symmetrical
ble support interconnecting the other end of said
co-axially with said electrodes.
grid with the other plate, and means forming a
3. An electron discharge device according to
claim 1, wherein said grid electrode is directly
connected at one end to one of said annular
members and wherein flexing means are provided
on the other end thereof and connected to the
sealed envelope about said electrodes.
6. The combination according to claim 5, in
combination with a tension spring inside of said
bellows attached at one end to the other end of
20 said grid and at its vother end to the other plate
_other of said annular members.
to maintain said grid under tension.
4. An electron discharge device according to
claim 1, wherein said grid electrode is connected
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