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Oct. 22, 1946.l
L_-TONKS
2,409,913
WAVE GUIDE STRUCTURE
Filed Feb. 14, 1944
-
3 Sheets-Sheet 1
Figi.
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'I ~
Tm v e h t o _r
Lewì Ton k s.
0
{Ep-4
bg „lay ¿MM
His Attori-neg.
v
OCL 22, 1946.
|__ TQNKS
2,409,913
WAVE GUIDE STRUCTURE
Filed Feb. 14, 1944
3 -Sheets-Sheet 2
Inventor`
_bg
Lewì Tonk;
¿IIL-»l
His Attorney.
OCI; 22, 1946.
L, TQNKS
2,409,913
IAVE GUIDE sTnUcTURE
Filed Feb. 14, 1944
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>Patented 0ct.
1946
2,409,913 5
_ UNITED~ sTATEs ' PATENT or-'FicE
_
WAVE GUIDE s'raUc'rUm;
Lew: Tonks, Schenectady, N. Y., „signor-'tc Gem'
eral Electric Company. a corporation of New
York
l
Application February 14, 1944,
No. 522,241
` 1s claims. (Cl. 178-44)
My invention relates to ultra high frequency
c systemsvand, in particular. to apparatus for
coupling an ultra high frequency generatorto a
, wave guide of the hollow pipe type. It is an ob
ject of my invention to provide an improved elec~
tric discharge device to wave guide coupling.
It is an object of my invention to provide a
coupling arrangement between a magnetron
generator and a wave guide of the hollow pipe
_
2
section similar to that of the wave guide coupling;
Fig. 'Lis a curve illustrating certain characteris
tics of the wave guide shown in Fig. 6; and Figs.
8-14 illustrate other configurations of the cross
section of the tapered coupling arrangement of
my invention.
_
Referring particularly to Fig. 1,' there- is shown
an ultra high frequency generator I0 of the mag
netron type which provides electromagnetic
type which is particularly'suited for the trans l0 waves of a predetermined frequency and mode to
mission of a large amount of power at a very .
a dielectric wave guide I l of the hollow pipe type.
short wave length.
'I'he electromagnetic waves from the generator I0
Another object of my'invention'is to provide a
are transmitted to the waveguide II through a
coupling arrangement between an ultra high
wave guide coupling I2 which is dimensioned to
frequency generator of variable frequency and a 15 aiford the same cut-oil' frequency to electromag
dielectric wave guide of the hollow pipe type
netic waves at longitudinally positioned points, as
which transmits power equally well over a broad
well as to provide a gradual transition in imped
band of frequencies.
ance between the magnetron output and the wave
One of the features of my invention consists in
guide I .
an arrangement whereby a tapered transition 20
While my improved coupling arrangement may
section is interposed between a magnetron gen
be employed with any suitable ultra high fre
erator and a wave guide of the hollow pipe type,
quency generator, one suitable device is shown in
the cross-section of the transition section being
Fig. 1 as the magnetron III which comprises an
dimensioned and shaped, at longitudinally posi
elongated cylindrical container. the lateral wall
tioned points, so that uniform wave guides having
- structure of which is provided by a single metal
such cross sections all have substantially the
lic tube I3 consisting of ferromagnetic material,
same cut-oil’ frequency, said cut-off frequency '
such as cold rolled steel or the like. Opposite
being the same as that of the uniform wave guide
ends of the container are similar in construction
fed by said tapered section. Moreover, the cross
and are closed by flanged members I4 which are
sectional area at longitudinally positioned points 30 welded
or otherwise hermetically joined to the
is dimensioned to effect a gradual transition in
inner
surface
of the part I'Il. Within the con
impedance between the magnetron generator and
tainer and approximately at its central region,
the output wave guide.
-
The features of the invention desired t0 be
protected herein are pointed out in the appended
claims. The invention itself, together with its
further objects and advantages, may best be un
there is provided an anode structure I5 shown
in plan view in Fig. 2. This anode structure com
prises a circular metallic member which has a
relatively large central opening i6 and a series of v
smaller openings >I‘l arranged symmetrically
derstood by the following description taken in ‘ about the central opening, and the central open
connection with the drawings in which Fig. 1 is
ing i8 is joined to the openings I‘I by means of
a vertical section of a magnetron device and a 40 laterally extending slotslß. Alternate ones of
coupling arrangement suitably embodying the in
the metallicv walls or anode posts between the
vention; Fig. 2 is an end view serving to illustrate
slots I8 are electrically connected together by
the magnetron structure employed in the device
means of conductive `straps I9.
of Fig. l; Fig. 3 is an end view of the coupling ar
Within the opening I6 of the anode structure,
rangement of Fig. 1; Fig. 4 is a longitudinal sec 45
as
shown in Fig. l, there is provided anindirectly
tion taken along the axis of one of the apertures
heated cathode comprising a sleeve 2i of nickel
of the coupling arrangement; Fig. 5 is another
cor. other suitable material having flanges 22 spun
view of the anode employed in the magnetron of
up at its extremities. 'I‘his sleeve, which may be
Fig. 1 showing the output arrangement; Fig. 6 is
coated externally ,with a suitable activating ma
a view of a uniform wave guide having a cross 50 terial such as barium oxide. contains a ñla
2,409,918
>
3
’
Y
mentary heater 2l by which it may be maintained
at an emissive temperature. Que end of the
cathode sleeve is closed by a metal disk 25, while
an apertured disk 26 partially closes its other
extremity.
'
frequencyof the eaciting electromagnetic waves
‘ is' greater than Aa critical minimum frequency
»
In the operation of the device. >a _space charge
is assumed to be developed in the space between
the cathode sleeve 2l and the surrounding anode
structure by the application of a suitable potential
impressed between the cathode lead-in wire 28 10
and the container . I0 to which the anode struc
which, in- turn, is> determined principally by the
transverse dimensions of the guide. The guide
is 'preferably constructed of a conductive mate
rial, such as copper or brass. ’ .Many types of
high frequency electromagnetic waves may be
transmitted
through
such - hollow~pipe
type
guides. -These waves have been generally -indi
cated heretofore as being of the TE and TM
types. The TM type waves have both a longi
ture is directly conductively connected. The ' vtudinal and transverse component of electric
ileld but only a transverse component of magnetic
electrons which compose this space charge :are
held, whereas the TE type waves have both aÍ
given a spiral or orbital motion by a magnetic
field produced by means to be described herein 15 longitudinal and transverse component oi.' mag
netic field but only atransverse component of ,
ai’ter, and their resultant gyrations about the
electric i‘leld. Electromagnetic »waves of this
cathode produce excitation of the anode structure
type may be extracted from a magnetron, such
at its resonant frequency. The functioning oi
as the' ~illustrated magnetron ld. Although my
the anode structure inthe latter connection may
invention is applicable to systems for transmit- _
be explained from one point of View by consid»
ting a greater variety of waves, in describing my
ering that it 'ls made up of a plurality of mutually
invention hereinafter „ reference will be made
coupled resonant units, in each of which induct-l
particularly to the TEm type of wave.
ance is provided by the wall surface bounding one
In order to provide means for directly coupling
of the circular openings l'l and capacitance is
provided by the opposing surfaces of one oi the 25 electromagnetic waves generated in the mag
»netron ill to the wave guide il the transition
slots iii. Taking this viewpoint, it is seen that
coupling section l2 is interposed between the
the operating frequency is determined in a large
wave guide il and the magnetron I0. The ta
measure by the dimensions of the openings i1.
pered transition section I2, as seen in Fig. 3, com
For the purpose of providing a magnetic field
of suñ‘icient intensity to permit the apparatus to 30 prises a metallic member 44 whose cross section
has two substantially circular aperturer 45, ß
function in its intended fashion, there are pro
therein connected together by a rectangular slot
vided within the container I3 tapered magnetic
pole pieces dit and 3i which are directed axially
4l. The size of the holes 45, 56 and of the slot \
of the container and which extend in close
41 increases uniformly from the end of the mem
proximity to the upper and lower surfaces of the 35 ber i2 connected to the magnetron to its point of
connection with the wave guide II.
~
anode structure i5. These pole pieces are per
manently magnetized in such sense that the
The transition section- I2 may be constructed
by forming two semi-circles at the wave guide
north pole of one faces the south 'pole of the
end of metallic member 44, each semi-circle being
other. in order to assure the existence of a
magnetic held of the required intensity, the pole 40 tangent substantially to three sides of the rec
pieces at, 3i are constituted of a magnetizable
tangular wave guide II. The two semi-circles
substance having a high coercive force and a
are connected together by two .straight edges
high energy factor. one material which may
49, 5U, as shown in Fig. 4. At its opposite end
4be used in this connection is that known as
the member 44 isvr provided with an oriiice com
Alnico, a name designating a particular class of 45 prising two symmetrically positioned holes 5I, l2
joined together by a rectangular slot 53, as
alloys of aluminum, nickel, and cobalt. .As an
shown in Fig. 3. The member M may then be
alternative structure, instead of using permanent
magnets for pole pieces 30, 3i, soft iron pole
bored with two conical holes which nt the large
pieces may be used and may be magnetized by
semi-circles at the Wave guide end of the member
means of an external winding (not shown).
50 and the circles 5I, 52 at the magnetron end of
In order to provide a low reluctance connection ~ vthe member. The partition between the hollow
cones »is then out away so that every cross sec
between the basic extremities of the respective
tion is of dumb-bell shape and of such propor
pole pieces and the lateral wall of the container
tions that a uniformguide of that same cross
I3, the pole pieces may be respectively seated
upon relatively thick- disk-like members 33 con 55 section would have a cut-oh' frequency sub
stantially equal to the wave guide cut-oft fre
sisting of ferromagnetic material, such as steel,
quency. At the same time, the coupling member
and may be secured to these members by means of
I2 eiîects a gradual change in impedance between
a clamping ring 34 slipped over the pole pieces and
the impedance at its magnetron end, whereits
welded to themembers 33. The base member 33
is of such diameter as to lit snugly within the 60 value is such that it provides optimum couplingA
with the cavity resonator of the magnetron, and
tubular container ' I3 so as to provide a low
the impedance at its wave guide end, where its
reluctance connection with that partc and is
welded to the associated closure member I4.
'value matches that of the wave guide II.V
For purposes of transmitting electromagnetic
Accurate spacing of the pole pieces 30, 3i with
reference to the anode structure I5 may be 65 energy from the magnetron into' the coupling
obtained by the use vof spacing rings 36 inter
. section i2, the anode I5 is flattened at one
point to provide a ñat wall 55,l as shown in Fig.
posed between anode structure i5 and the sur-v
face ci an apertured disk 31.
5, against which the left-hand end of the cou-V
The Vwave, guide li is illustrated as a hollow
pling section i2 abuts. The ñat wall 55 of the
pipe having a rectangular cross section and 70 anode is provided with an output oriiice of
defined by conductive .side walls dii and con- `
dumb-bell shape which comprises two circular
ductive top and bottom walls 4I, 42. It is well
openings 56, El equal in diameter >to the open
known that ultra high frequency electromagnetic
ings 5i, 52 of coupling l2 and connected by a
waves may be propagated dielectrically through
rectangular slot 58’ which coincides with the
such a hollow-pipe type wave guide Where the 75 slot 53 of coupling member l2. The cylindrical
2,409,918 '
5
tank I3 may be provided with an aperture over
lying the wall 55 of anode Il'through which a
centimeters. If we assume a given slot thick
` ness for slot ,58 and a value for the dimension l,
constricted portion 66 of coupling member I2 "
the curves of Fig. 7 enable us to calculate thedi
mension d. Assumption of a sequence of values
for t and l enables us to reach the following set
of values which are consistent with Fig. 7 and
which are primed to distinguish them from actual
projects. The coupling member l2 may be se
cured to tank I3 of the magnetron in any suitable
manner. as by welding or brazing.
At its point of connection with wave guide 'I l,
the coupling member I2 may be sealed to the wave
guide through a dielectric window 6I , as shown in
Fig. 1. The window 6I may be sealed across a
dimensions:
'
I
.
l' :0. 50 `
rectangular opening in a metal wall 62, con
structed of a suitable alloy, such as an iron-nick
el-cobalt alloy. to facilitate sealing of the window i
thereto. Wall 62 is interposed between the abut-~
When multiplied by the ratio 14.5/10, the _desired
ting end's of coupling member I2 and wave guide 15 values
are given as
‘
.1
.
I I, being brazed or welded to member I2. A con
ductive strap 63 welded or brazed to both mem
bers II and I2 strengthens the joint.
l1= .725
di = . 276
Window 6| `
is provided with a shoulder yportion 6l, which ilts _
into a corresponding shoulder in wall 62 on the 20
high pressure side thereof, to strengthen the glass
to metal seal. After the window 6I is sealed in
Iplace. the magnetron and the coupling unit I2v
may be evacuated through an exhaust tubulation
,
ù = . 0174
li-l-di =1. 001
where the subscripts denote that these dimen
sions apply at the small end, and where the ñnal
value of the set shows thatthe over-all length
of the guide section is `approximately 1 inch.
69 connected to the bottom of the magnetron 25 These dimensions fix the small or magnetron end
oi' the tapered section. Y `
The operation of -thewave guide coupling unit
The .large or wave guideend of coupling I2 is
I2, as well 'as its dimensioning, may be better un
fixed by the wave guide dimensions:
derstood from the following description of the
d2=1.44
propagation characteristics of the dumb-bell 30
cross section wave guide, which. in tapered form,
constitutes the coupling unit. To assist in this
explanation, reference is made to Fig. 6 of the
Sinceithe circular arcs at the large and small '
drawing wherein the circular openings 5I, 52 are
ends are joined by conical surfaces, it follows
shown as having a diameter d. The distance be 35 that for any cross-section a fractional distance
tween the centers of the circular openings 5I, 52
.f (shown in Fig. 4) from small to large end
is designated as the dimension l. The length of
structure.
the slot 53 is shown as equal to 2b and the height
of this slot as having a value t. 'I'he angle sub
tended by half of the gap 53 at the center of one 40
of the holes 5I, 52 is equal to a.
It is then possible to construct the following
table:
,
_
’I'he curves in Fig. 7 have been derived by the
suitable application of Maxwell’s equations to the
propagation space of the wave guide shown in
Fig. 6. These curves give the dimensions of cross
sections which produce a cut-ofi’ wave length of
10.0 centimeters. 'For example, a cross section
in which t=.018 inch, l=0.5 inch, and d=0.2 inch,
has its cut-oil' at 10 centimeters, because for it
0. 1
.392
0. 2
.509
0. 3
.625
0. 4>
.742
0. 5
.858
1. 0
1.440
724
. 792
. 859
. 927
. 994
1. 067
1. 4m
. 382
. 495
. 545
. 021
. 592
. 591
. 042
. 675
499
. 012
. 639
. 070
. 747.
. 685
. 107
. 805
. 735
.145
____ ._
.... __
____ _..
. 061
. 101
. 155
. 210
1. 440
. 0174
d/l=0.4, and following the d/l=0.4 line 70 on
Fig. 7 to its intersection with the l=0.50 curve. it
is seen that that intersection lies also on the
:.018 inch line.
Certain approximations have to be made in the
mathematical theory leading to Fig. 7, with the
0
.276
0305
The values of f in horizontal row 1 are chosen
conveniently and arbitrarily. , Rows 2 and 3 are
calculated by Equations 1 and 2. Row 4 follows
55
consequence that the curves are substantially»
valid over a limited region which is defined by the
dashed curves labelled „l=0.5 radian and t=l-d.
It is well known that to apply a set of curves,
such as those of Fig. 7, to a structure having a 60
cut-ofi’ wave length of l centimeters, diiïerent
from 10 centimeters. it is only necessary to multi
ply the actual dimensions by 10/7l thereby obtain
from rows 2 and 3. - Row 5 is obtained by multi
plying row.3 by the ratio 10/14.5 as previously
explained. Row 6 is taken from Fig. 7 using
rows 4 and 5, except in vertical column 8 which
applies to the rectangular wave guide. Row 7 is
row 6 multiplied by 14.5/ 10.
'.
Thus the dimensions of the coupling section
are complete up to half the distance from the
small or magnetron end to the wave guide end.
It is seen, however, that Fig. 7 does not~ apply
By way of illustrating the procedure of obtain 65 beyond l=0.5 so that another consideration has
to -be used. The 4curve of t against f in Fig. 4 is
ing from Fig. 7 the dimensions for a tapered wave
continued as a smooth curve to t=1.44 at; f=1,
guide coupling section, consider an actual exam
that is, at the wave' guide junction, as indicated
ple in which the wave guide I1, of Fig. 1 is 1.44
in Fig. 4.
vinches x 2.84 inches, inside- dimensions, the ta
In connection with the foregoing illustration,v
pered section I2 is 4 inches long from magnetron 70
it is pointed out that, while the length of 4 inches
block I5 to wave guide II, and the oriilce 56, 51,
used in the illustration is approximately equal
56 at the small end is approximately 1 inch long
ing scaled values to which Fig. 7 is applicable.
over all.
‘
to a lil-centimeter wave length of the wave
'
The 2.84 inch dimension of the wave guide im
mediately ñxes the cut-oil wavelength A@ as 14.5
w
propagated in the guide, the length of the transi
tion section I2 is not necessarily thus related to
the wave` length or the electromagnetic wave>
`
ï 2,409,913
_
t
8
7
,
\being propagated. Instead, the over-all length
What I `claim. as new and desire to secure by
oi' the transition section I2 may be any value
which gives an essentially smooth variation of
impedance over a length greater than approxi
mately 1‘5 of a wave. length in free space. Of
Letters Patent _of the United States is:
1. A wave guide of the hollow pipe type defined
by a block of metal provided with a tapered longi
l tudinal opening, every cross section of ,said open
course, the cut-oi! wave length at every cross
-ing taken at .longitudinally positioned points
' section, that is. the cut-oi! wave length of a
uniform wave guide having this particular cross
section, must be greater than the wave length
^ ot the wave being propagated.
Another im
portant advantage of the coupling arrangement
is that the gradually tapered section provides
an essentially smooth transition in impedance so
that -the coupling section is substantially re
ilectionless at all points beyond approximately
11s of a wave length from the point 'of connection to the ultra high frequency generator.
.
thereof comprising a narrowed central portionv
' and being dimensioned so that al uniform wave
' guide of said cross section would ailord the same
10 cut-oi! frequency to electromagnetic waves.
2. A couplingl device for an ultra high ire
quency transmission system comprising a conduc
tive member defining'therein a tapered longitu
» dinal opening the cross-sectional arca of which
_ at longitudinal points comprises a'. narrowed cen- _
tral portion and is dimensioned to have a pre- __
` determined variation in impedance along Ithe
longitudinal axis.
_While in the illustrations and discussion thus
far the cross section of the coupling member I2
3. A coupling 'device for use in an ultra high
has beenI described as being substantially dumb 20 frequency transmission system comprising a con
ductive member having a_ tapered longitudinal
bell in shape, the cross section of the section I2
opening extending therethrough the cross sec
need not be limited to this particular shape and
any other suitable cross section may be employed, l
tion of which at one end is deilned by an elon
the apertures in the member tapering from the
gated central opening terminated at each end
point of connection to the ultra high frequency
in an enlarged opening the last mentioned open
device to the end connected to the wave guide I I..
-ings progressivelyy increasing in cross-sectional
In Figs. `8-l2, there are shown other coniigura- s >area in the longitudinal direction.
tions of cross sections for the coupling member
4. A dielectric wave guide of the hollow-pipe
type comprising a block of metal having tlierein
I2, all of which employ a pair of apertures 80, 8-I
, connected by a slot 82. Each of the apertures and 30 a tapered longitudinal opening the cross sectional
the slot are tapered between the two ends of
area of which at one end includes a central elon
the coupling member I2. Fig. l1, for example,
gated slot terminated- at each end thereof in`
shows a cross section which is rectangular in
an enlarged circular opening, the last mentioned "
form and Fig. 12, one which is octagonal in
openings progressively increasing in cross sec
35 ltional area in the longitudinal direction.
5. In combination, a dielectric wave guide of`
In Fig. 13, there is shown a cross section for
form.-
.
t
the couplingmember I2 in which the two tapered
- apertures 80, Stare not of the same size so that
the hollow-pipe type comprising a conductive
member of'rectangular cross section„an ultra
high frequency generator. comprising a cavity
the symmetry oi' >form illustrated in the preced
_ing cross section views of the coupling member 40 resonator, and means. for coupling said Wave
guide and said cavity resonator comprising a con
- I2 is not present in this particular form oi' cou
ductive member having therein a tapered longitu
pling member. A similar asymmetrical condi
tion may ibe employed in coupling members using
dinal opening the cross sectional area of whichl at
longitudinal points comprises a narrowed central
circular apertures, as well as members using
portion and is dimensioned to effect a gradual
rectangular apertures, as in Fig 13. In Fig. 14.
the slot connecting the tapered apertures 80, SI is
transition in impedance.
'f
» of a sinuous type and consists of a pair of parallel
6. In combination, a waveguide of the hollow
passages 33, 84 and a connecting passage 85. Con
ñgurations in the cross section of a coupling unit
pipe type, an Yultra, high frequency generator
comprising'a cavity resonator, and means for cou
of this type are especially desirable where the 50 pling said wave guide and said cavity resonator
cut-off frequency oi’ the wave being propagated' ‘ comprising a conductive member having a length
is relatively low so that extremely large wave , greater than 1x5 of afree space wave length of
an electromagnetic wave in said generator, said
_
member havingtherein a tapered longitudinal
It is apparent, moreover, that, while the wave
guide II is illustrated as of the rectangular type, 65 opening. the cross sectional area of which at
longitudinal points comprises a constricted. cen
'the coupling- member I 2 may-be employed to con
tral portion and is dimensioned to effect gradual
nect the output 'of an ultra high frequency device
transition in impedance.
‘
to a wave guide of any given configuration, the
'1. In combination, an ultra high frequency
criteria'being that the cut-off wave length at
every cross section must be greater than the wave 60 generator of the space resonant type compris
guide sections would :be required.
v length of the electromagnetic wave being propa
ing a metallic member for defining a. cavity res
gated and that a gradual transition impedance be
effected between the two ends ,of the couplim
onator, said member being provided with an
aperture through which high frequency',y energy
unit to effect a match with the impedanceof
may be extracted, a dielectric wave guide of the
the wave guide connected thereto. -ì <Such a 65 hollow pipe type, and coupling means for `con
' coupling is particularly suited for the trans
mission of large amounts of energy of relatively
‘ short
’
wave
length.
r
,
'
While >I have shown a particular embodiment
necting said generator to said Wave guide com
prising -a metallic vmember Ahaving' therein a
tapered longitudinal opening the cross sectional
' area of which at longitudinal pointsvcomprises,
of my invention, it will of course be understood 70 a constricted central portion and is dimensioned
that I do not wish to be limited thereto since ` to have a substantially uniform cut-off`charac
teristic and having at one end adjacent said gen
_various modifications may be made, and I >con
erator a geometry similar to said aperture.
template fby the appended claims to cover any
8. In combination, an ultra high frequency
such modiñcations as fall within the true spirit
75 magnetron of the space'resonant type comprism
and -scope of my invention.
2,409,913
ing a plurality of electrodes including an anode
structure for defining a. cavity resonator, said
anode structure being provided with an aperture
comprising a central slot terminated at the ends
in circular openings, a dielectric wave guide of
the hollow pipe type having a rectangular cross
section, and coupling means between said anode
structure and said wave guide comprising a con
ductive member having a tapered longitudinal
10
said structure and said wave guide comprising
a conductive member having a tapered longitu
dinal opening the cross sectional area of which
comprises a narrowed central portion and is
dimensioned to añord a transitional impedance
which provides optimum coupling to said cavity
resonator and impedance matching with said
wave guide.
11. A dielectric wave guide of the hollow pipe
opening the cross sectional area of which is di 10
type defined by a block of metal having a longi
mensioned at one end adjacent said anode struc
tudinal opening comprising a pair of longitu
ture for optimum coupling to said cavity resona
dinal tapered openings joined by an intermediate
tor and dimensioned at the other end to match
slot, the separation of opposing faces of said slot
the impedance of said guide.
increasing with the cross sectional area of said
9. In combination, an ultra high frequency 15 tapered opening.
'
magnetron of the space resonant type compris
12. A dielectric wave guide of the hollow pipe
ing a plurality of electrodes including anuanode
type defined by a block of metal having a longi
structure for defining a cavity resonator, said
tudinal
opening comprising a pair of longitudinal
anode structure being provided with an aperture,
conical openings joined by an intermediate slot
a dielectric wave guide of the hollow pipe type, 20 the
separation of opposing ‘faces of which in
and coupling means between said anode structure
creases
in accordance with the cross sectional
and said guide comprising a conductive member
area of said conical openings.
having a tapered longitudinal opening the cross
13. A discharge device for an ultra high fre
sectional area of which comprises a narrowed
quency transmission system comprising a con
central portion and is dimensioned to have a
transitional impedance which provides optimum 25 ductive member deiining therein a tapered longi
coupling to said cavity resonator and impedance
matching with said guide.
tudinal opening comprising a pair of longitudinal
conical openings joined by an intermediate slot
the separation of opposing faces of which in
10. In combination, an ultra high frequency ~
generator of the space resonant type including a 30 creases in accordance with the longitudinal cross
sectional area of the conical openings to produce
structure for deiining a, cavity resonator, said
at
one end a substantially rectangular opening
structure being provided with an aperture
for connection to a dielectric wave guide of the
through which the energy of said cavity resonator
hollow pipe type.
.
may be extracted, a, dielectric Wave guide of the
hollow pipe type, and coupling means between 35
LEWI TONKS.
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