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Патент USA US2407147

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Sept. 3, .1946.
N. v. FEDQT‘QFFI
I
v2,407,147
‘ADJUSTABLE TRANSMISSION LINE
Filed Feb. 27, 1945
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INVENTOR.
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NICHOLAS V. FEDOTOFF
ATTORNEY
Sept 3, 1946'
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N. V._FEDOTOFF ‘
2,407,147
ADJUSTABLE TRANSMISSION LINE
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Filed Feb._ 27, 1945
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INVENTOR. ’
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NICHOLAS v FEDOTOFF
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ATTORNEY
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' Sept. 3, 1946.
‘2,407,147
N. V. FEDOTOFF
ADJUSTABLE TRANSMISSION LINE
Filed Fe_b. 27, 1945
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3 Sheets-Sheet 3
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INVENTOR.
NICHOLAS. V. FEDOTOFF
A‘E'TORNEY
Patented Sept. 3, 1946
‘ 2,407,147
‘UNITED STATES PATENT OFFICE‘
2,407,147
ADJUSTAB‘LE 'TRANSMIS SION LINE
Nicholas V. Fedotoff, Lynbrook, N.‘_Y., assignor, by
mesne assignments, to Hazeltine Research, Inc.,
Chicago, 111., a corporation of Illinois
' ‘
Application February 27, 1945, Serial No. 579,975
12 Claims.
1
2
This invention is directed to transmission lines
,of adjustable electrical length. While the inven
tion is subject to a variety of applications, it is
especially suited to short-circuited transmission‘
lines- and will be particularly described in that
connection.
Short-circuited transmission lines of the type
_'under consideration comprise a pair of conduc
tors usually arranged in either spaced parallel or
‘coaxial relationship to have uniformly distributed
inductance and capacitance. The effective elec
trical length of such a line may be adjusted by
means of a short-circuiting element bridged
i
-
struction, rotation of the inner conductor ad
vances the tuning element along‘ the line for
tuning. This construction‘ has the advantage
that the physical dimensions of the structure do
not vary with tuning. However, from a mechan
ical standpoint it is desirable that the inner con
ductor be made of steelbut steel is a poor con
' ductor at ultra-high frequencies,
Furthermore,
it is necessary to, lubricate the threaded portion
of the inner conductor whereasbest operation of
the line requires that its conductors be maintained
clean. . Additionally, the discontinuities in the
skin of the inner conductor resulting from the
across and freely slidable along its conductors.
screw thread may impair the conductive char
Where the adjustmentof the short-circuiting ele 15 acteristics of the transmission line. '
'
ment is such that the electrical length of the line
. ‘It is an object of the invention, therefore, to
plus its terminating impedance‘ is equal to ‘one
provide a transmission line of adjustable elec
quarter of its op'erating‘wave length, or an in—
tegral multiple thereof, the ‘line exhibits imped
_ ance characteristics analogous to those of con
‘trical length which avoids one or more of the
above-mentioned limitations of prior art arrange
ments.
‘
,
,
‘
‘
-
,
ventional resonant circuits and is said ,to be a‘
resonant line. Since the frequency-response
characteristic of a resonant line may be readily
modi?ed through adjustment of its short-circuit
ing or tuning element and in view' of other well
trical length having reduced space requirements.
tions,
path by‘ the driving member,
It is a further object of the invention to provide
an improved transmission line of adjustable elec
, A, transmission line of adjustable electrical
length in accordanceiwith the invention com
recognized properties of Jlinearrangements, res
prises a first conductor and a second Iconductor,
onant lines are widely used as frequency-selec
the latter having an axially extending slot and a
tive or frequency-determining circuits of Wave
predetermined spaced relation to the ?rst con
signal translating apparatus designed for oper
"ductorh An ‘adjustable member is movable in a
ation at ultra-high frequencies,
30 predetermined path in the. space between the ‘con
In one short-circuited line arrangement of the
ductors, for varying the electrical length of the
prior art, the position of the tuning element is
transmission line including these conductors.
adjustable through a mechanical link disposed
The arrangement also comprises a driving, mem
along the line in the space between its conduc
“ber disposed within the second conductor for ex
‘ tors and a?ixed to, the tuning element, the link
‘?Iting‘ a controllable driving force along the line.
' and tuning element together constituting atuning
“ The‘, line also has means projecting through the
, plunger axially movable along the line. While
‘slot of the second conductor into mechanical
coupling engagement with the‘adjusta‘ble mem
arrangements of this type have proved to be oper
ber and the driving member‘ for effecting a ‘dis
ative,‘ they have ‘certain inherent limitations
placement ‘of the adjustable member along its
which may be objectionable in particular installa
For example, as ‘the tuning plunger is
‘
,
For a better understanding of the present in
length, the’ over-all ‘physical length of ‘the ar
. vention, together with other and further objects
rangement is increased progressively. Where , thereof, reference is had to the following descrip
space limitations are important, this feature may 45 tion taken in connection with the accompanying
withdrawn from the line to increase its electrical
,
be undesirable.
‘
‘In another line ‘structure of the prior ‘art in
which the conductors have a coaxial or concen
, tric relationship, the inner conductor is rotatably
supported ‘and is provided with a screw thread
adapted to engage a threaded bushing of the tun
ing element. Additionally, the tuning element is
slidably mounted on one or more guide rods posi
tioned in the interconductor space which lock the
drawings, ‘and its scope will be pointed out in the
I appended claims.
In the drawings, Fig. 1 is a cross-sectional view,
partially‘broken aw‘ay,of a transmission line con
50' structed ‘in accordance with theinvention; Figs.
2 and 3 are additional sectional views taken as
indicated by section lines 2-2 and 3—3, respec
tively, of Big. 1; ‘Fig. 4 is a schematic ‘represen
tation of a wave meter arrangement utilizing the‘
tuning element against‘ rotation, ,With this ,con 55, transmission line ofFigs. .1-3,inclusive; Fig. 5 is
2,407,147
4
1
Fig. 9 is a schematic circuit diagram of a power
lead screw 25, the line arrangement includes
means projecting through the slots l1 and N3 of
the inner conductor into mechanical-coupling
engagement with both the adjustable short-cir
cuiting member and the driving member 25. As
i bridge network utilizing the transmission line of
illustrated in Fig. 2, this means consists of a
a cross-sectional view of a further embodiment
of the invention; Figs. 6, 7 and 8 are additional
sectional views taken as indicated by section lines
6—6, '|—l and 8--8, respectively, of Fig. 5; and
threaded bushing 35 having diametrically op
posed extensions 36 and 31. The threaded por
tion of the bushing engages lead screw 25 while
of the coaxial or concentric type. It comprises 1O the extensions 35 and 3'! thereof project, respec
tively, through slots l1 and I8 of the inner con
a hollow outer, or ?rst, conductor I0 and a hollow
ductor tobe secured to the short-circuiting mem
inner, or second, conductor II, each ofwhich is
ber by way of machine screws 38. Also, extension
circular in cross section. Thesecond conductor
Figs. 5-8, inclusive;
Referring'n'ow more particularly to Figs. 1', 2
and 3, the transmission line there represented is
is coaxially disposed within the. ?rst conductor
36‘is su?icientlylong to extend through longitudi
so as to have a predetermined spaced relation: ‘
nal. slot |~B of outer conductor ID to serve as an
with reference thereto. A pair of centrally aper
tured end plates I2 and H) of conductive material
are ?tted to the opposite ends of conductor ID.
A conductive bushing I4, inserted into the aper
indicator for permitting the position of the short
circuiting member to be determined upon inspec
tion. A calibrated scale (not shown) is associ
ated with slot I8 so that extension 36, in con
junction therewith, provides a direct indication
of the resonant wave length of‘the transmission
line for each adjustment of its short-circuiting
ture of end plate l2 and nonrotatably supported - -'
thereby, is received by one end of conductor | | to
establish the desired coaxial alignment of the in
ner and outer conductors. The alternate end of
conductor II is supported in a manner described
hereinafter, to complete the desired coaxial align
ment of these conductors.
element.
An additional threaded bushing 40, having the
same general con?guration as bushing 35, is also
included in the line arrangement. This addi
tional bushing is slidable along a pair'of studs 4|
and 42 extending from bushing 35. Each of the
bushings is centrally recessed to house a helical
One or more machine
screws l5, locking conductor H to. bushing I4,
hold the inner conductor against rotation. An
axially extending‘or longitudinal slot I5 is milled
into conductor I0 and similar but diametrically
spaced slots l1 and- I8 are cut into conductor H.
In assembling the line arrangement, its con
ductors areso oriented that slots I6, I‘! and I8
are in vertical alignment.
spring 43. The added bushing, in conjunction
with spring 43, constitutes an anti-backlash
mechanism.
Energymay be supplied toy or taken from the
transmission line by means of pickup devices
which may be accommodated by suitable recep
tacles 5E! and 5| projecting through conductor
The transmission-line structure includes an
adjustable membermovable in a predetermined
path in the space between conductors I0 and II
for varying the electrical length of the line con
stituted by, or including, these conductors. For
the illustrated arrangement, this adjustable 40
H! as clearly disclosed in Fig. 3.
These recep
tacles are preferably diametrically opposed and
therefore the circuit arrangements coupled there
to are shielded by the centrally located inner
conductor ||.
member short-circuits the inner and outer c'on
The current-carrying elements of the line
ductors to determine the electrical length of the
line-and is provided by a ring 2!] having a series of
resilient contact ?ngers 2| and 22 disposed about
its inner and outer peripheries. Contact ?ngers
2| and 22 are suitably ‘formed and proportioned
to engage the inner and'outer conductorsv of the
line so that the short-circuiting member is sup
ported by and freely movable along these con
structure, suchas conductors l0 and H and con
tact ?ngers 2| and 22 may be formed of brass
and are, preferably, silverplated to have improved
conductivity characteristics. Shaft 24, however,
is preferably machined from steel stock.
The illustrated embodiment of the invention
effectively comprises a coaxialitransmission line
which is short-circuited at each end and may,
therefore, be considered as a resonant cavity.
ductors in the space therebetween.
A driving member is disposed within the second
or inner conductor ll of the line for exerting a
The effective electrical length of the cavity is
equal to one-half its resonant wave length and
controllable driving force therealong and for aid
ing in establishing the‘ coaxial alignment of the
may be adjusted by displacing the short-circuit
inner and outer conductors. This driving mem-~ 56' ing member along its inner and outer conductors
to tune the cavity over a predetermined range
ber is provided by a rotatable shaft 24 a portion
of operating wave lengths. In this connection
of which is threaded, as indicated at 25, to form
it will be apparent that the wave-length range
a lead screw. One end of shaft 24 is rotatably
is determined by the permissible range of dis
supported in a bearing26 secured to a centrally
located recess in the end of bushing l4 which is‘ SO placements of the short-circuiting member.
Therefore, the physical lengths of conductors l0
adjacent this end of shaft 24. Preferably, bush
and II, which are shown inde?nitely in Fig. l,
ing 26 is constructed of an oil-impregnated ma
are selected with a view to obtaining a desired
terial to be self-lubricating. The opposite end
range of operating wave lengths.
'
of the shaft is rotatably, supported in a bearing
The schematic circuit‘ diagram of Fig. 4 repre
2'! retained in endplate l3 by means of retain (35
ing rings 23 and 29. This shaft also projects
sents the application of the described line ar
rangement to a wave‘ meter system for determin
through a bushing construction 30 carried by the
free end of conductor | l- and serves to maintain
ing the operating wave length of an oscillation
generator 53.
' the coaxial alignment of conductors I0 and H.
The'free end of shaft 24 extends beyond end plate‘
I3’ and supports a crank 3| through which the
rotation of the lead screw may be controlled.
In order that the adjustable short-circuiting
member 20, 2|, 22 may be selectively displaced
along'thev transmission line under the. control of
‘
A coupling loop 52, coupled to
generator 53 and extending into the resonant
cavity by way of one of its receptacles 50 or 5|,
excites'the cavity. A second coupling loop 54 ex
tending into the resonant cavity through the
other of its receptacles couples a detector 55
The output circuit of the detector is
thereto.
2,407,147
5
,
coupled to a meter 55, such a'sa voltmeter- In
operating the wave meter system‘, lead screw 25
6
.
~ The effective electrical length‘of the transmis
ductor II lock bushing 35 against rotation so
that this bushing and the short-circuitingmem
sion line, including conductors<l03 and I06, may
be adjusted by, means of a ‘conductive short-cir
cuiting member or yoke I30 which is supported
by and freely movable along the line conductors.
ber carried thereby are displaced along conduc
As illustrated in Fig. "7, the'short-‘circuiting yoke
tors I0 and II by lead screw' 25. This'adjust
ment of the short-circuiting member varies the
electrical length of the resonant cavity, tuning
I30 is essentially a circular disc apertured to-ac
commodate conductors I03 and I06 and having
resilient contact ?ngers I31 and I32 which en
is rotated by crank 3|. The slots of inner con
the cavity over its range of operating wave
gage the line conductors andafford a desired
connection to the yoke. An indicator I33, se
cured to the upper section of yoke I30 and project
ing through slot II 3 of the shield, enables the
position of the short-circuiting member to be
?ection is obtained on meter 50. The operating
wavelength of oscillator 53 may then be deter 15 determined upon inspection. If desired,‘ the
shield may be suitably calibrated to indicate the
mined from the position of ‘ projection 36 with
operating wave length for particular settings of
reference to the wave length scale associated with
lengths. When the effective electrical length of
the cavity corresponds to one-half the operat
ing Wave length'of the oscillator, a maximum de
slot IS in conductor I0.
.
member I30.
>
As in the described Fig. 1 embodiment, the driv
of the present invention to a transmission line 20 ing member for effecting displacements of, the
short-circuiting yoke I30 along the line is pro
including a pair of spaced parallel conductors as
Figs. 5-8, inclusive, illustrate the application
vided by one or‘ more lead screwsvrotatably dis
sociated with a bolometer element to be utilized
posed within the line conductors. Preferably, two
as a component of a ‘power-measuring bridge
such lead screws are provided, one- being indi~ _
network. The line arrangement is enclosed with
in a conductive shield I00 having a circular cross 25 cated at I 40 and disposed within conductor‘ I03
while the other‘ I“ is located within conductor
‘section and conductive end plates I BI and I02.
I05. One end of each lead screw has a reduced
The transmission line includes a ?rst hollow con
cross section and projects through end plate I02
ductor ‘I03 having a longitudinal slot I04 and
of the shield to support driving gears I42 and
carrying at one end a conductive bushing I05 for
I43. A third gear I44, meshing with gears I42
effectively'extending the conductor. A second
and I43 and supported by a. stub shaft I45, pro
conductor has a similar construction‘ and consists
vides a unicontrol for e?ecting identical adjust
of a hollow conductivemember I06 with a longi
ments of lead screws I40 and MI. Stub shaft
tudinal slot I01 and a conductive bushing I08.
I45 is also rotatably supported within end plate
These conductors are assembled in ‘spaced par
I02 and carries upon itsfree end a crank I46
allel-“relationship, being‘secured atone end to
for controlling the driving members I40 ‘and
‘suitable recesses in end plate I02 of the shield
and being supported at their‘ opposite ends by a
As illustrated in Fig. 7, yoke I30 is slotted to
disc I09 of insulating material and apertured to
receive a pair of threaded'vanes I 50 and‘ I5I
receive conductive bushings I05 and I08. Disc
I09, in turn, is mounted by means of brackets .40 which engage lead screws I40 and MI, respec
tively, for effecting displacements of the yoke
H0 and III to a conductive collar II2 slidable
member by the lead screws. Vanes I50 and I5I
along shield‘ member I00. In order that collar
MI.
I
r
.
I.
> I I2 may‘slide along the shield, the shield is ‘slotted '
are locked in position by means of threaded pins
as indicated at I I3 and I I4, the slotshaving su?i
cient width‘to accommodate brackets H0 and
I I I. A series of tabs I2I are struck out of collar
IIZ, as shown in Fig. 8, and‘ are depressed fric
tures in the yoke I30 and each of the vanes.
Fig. 9 represents a schematic circuit diagram of
tionally to engage shield‘ I00.
‘
A bolometer element II5, consisting of a cen
I52 and I53 which project through aligned aper
a bolometer-type power-measuring bridge net~
work, utilizing the line arrangement of Figs. 5-8,
inclusive, for measuring the power output of an
ter-tapped temperature-variable resistor en- :
' closed within a glass envelope, is supported upon
oscillation generator I55. The bridge network is
similar to the well-known Wheatstone bridge in
disc I09 by means of insulating, straps HE. A
conductor I24 connects with the center tap of the
bolometer and is drawn through an opening of
shield‘ I00 to connect the bolometer element into
a bridgevnetwork. This element is also elec
that it essentially comprises a network of re
sistors. Three of the arms or the bridge are pro
vided by a variable resistor IBI for balancing the
trically coupled to conductors I03 and I08 by
wayof connectors Ill and H8, extending from
the opposite ends‘of the bolometer element to re
silient contact ?ngers H9 and I20. Thesecon
tact ?ngers are secured to disc I09 and are suit
ably shaped to engage bushings I05 and I08 of
the transmission-line conductors I03 and I05, re
spectively. The ‘adjustable mounting of disc I09
is provided to permit adjustment of the coupling
bridgenetwork in the face of ambient tempera
_ ture variations, a variable resistor arrangement
I62~calibrated with reference to bolometer ele
ment I I5 to read directly in terms of power and
' a'?xed resistor I03.
The remaining arm of the
bridge includes the line arrangement of conduc
tors I03 and I00 and their associated bolometer
, element II5. ‘ The line arrangement; is:coupled
into the bridge circuit by means of the conductor
_ I24 extending from the mid-point of thebolome
,ter element H5 and a second conductor I50 coupled to the shield I00. A source I64 of unidi
rectional potential is coupled to one pair of di
for a purpose. to be made clear hereinafter; A
pickup loop'l25 is received by apertures in com
agonal terminals of the bridge and an ammeter
I85 is connected between the remaining diagonal
ductive bushings I05 and I08 and serves to cou—
ple the transmission line to a circuit arrange- " terminals; The bridge network is positioned ad
jacent oscillation generator I55 with its pickup
ment, such as an oscillation generator, for the
loop I25 inductively coupled thereto,‘ as ‘by? way
purpose of making power measurements; This
loop projects through an opening I26 of end-plate
of an inductor I55. While radio-frequency en
IOI and may be adjustedlongitudinally of the
ergy is applied to the bolometer element I I5 from
.line, by means of set screws. I21 and‘l28;
transmission line conductors I03 and I00, ‘only
of the bolometer. element to the line conductors,
'2,407, 147
8
direct current‘ is applied to'the bridge arrange
ment in view of the connection I24 to the mid
What is claimed is:
l. A transmission line of adjustable electrical
length comprising, a ?rst conductor, a second
conductor having an axially extending slot and
point. of the bolometer and conductor I60 to the
shield.
a predetermined spaced relation to said ?rst con
In making power measurements, the bridge
ductor, an adjustable member movable in a pre
network is initially balanced by adjustment of
determined path in the space between said con
resistor IGI but with the bridge decoupled from
ductors for varying the electrical length of the
the oscillation generator. Having established the
transmission line including said conductors, a
initial balance, pickup loop I‘25' is brought into
inductive coupling relation with inductor I56 of 10 driving member disposed within said second con
ductor for exerting a controllable driving force
the oscillation generator. The position of bo
along said line, and means projecting through
lometer element II5 along transmission line I03,
said slot into mechanical-coupling engagement
I06 as‘ well as the position of its short-circuiting
with said adjustable member and said driving
yoke I30 are then adjusted. to effect an impedance
match between the line arrangement and the 15 member‘for effecting" a displacement of said ad
justable member along said path by said driving
oscillation generator for maximum power trans
fer therebetween. By sliding the disc I09 to vary
member.
'
2. A transmission line of adjustable electrical
the position of the bolometer element with refer~
length comprising, a ?rst conductor, a hollow
ence to the line conductors, an approximate or
coarse impedance match is readily obtainable. 20 second conductor having an axially extending
slot and a predetermined spaced relation to'said
Through crank I46 lead screws I40 and MI are
rotated to displace the short-circuiting yoke I30
?rst‘ conductor, an adjustable member movable
in a predetermined path in the space between
as required to perfect the impedance match.
said conductors for varying the electrical length
It will be apparent from the adjustments de
scribed that the line arrangement is similar to 25 of the transmission line including said conduc
tors, a driving member disposed within said sec
an adjustable transmission line terminated in an
ond conductor'for exerting a controllable driving
impedance element and having a stub line for
force along said line, and means projecting
providing impedance-matching conditions be
through said slot into mechanical-coupling en
tween the terminating impedance and'a circuit to
which the line is coupled. In other words, that 30 gagement with said adjustable member and said
driving member for effecting a displacement of
portion of the line arrangement extending from
said adjustable member along said path by said
the connections of the bolometer element H5
driving member.
'
with conductors I03 and I06 and including pickup
3. A transmission line of adjustable electrical
loop I25 may be considered as a line arrange
ment terminated in a resistive load. The re 35 length comprising, a ?rst conductor, a second
conductor having an axially extending slot and
mainder of the line arrangement between the
connections to the bolometer element and the
short-circuiting yoke I30 may be considered as
disposed in spaced parallel relationship to ‘said
arrangement I62, calibrated for direct power
said adjustable member along said path by said
readings, is adjusted to re-establish a balanced
condition in the bridge network and provide the "
desired indication of the power output of oscil
driving member.
?rst conductor, an adjustable member movable
in a predetermined path in the space between
a stub line, adjustable to e?ect impedance
matching between the composite line arrange 40 said conductors for varying the electrical length
of the transmission linev including said conduc
ment and oscillation generator I55. The energy
tors, a driving‘member disposed within said sec
transferred from the oscillation generator to the
ond conductor for exerting a controllable driving
- transmission line through the coupling between
force along said line, and means projecting
pickup loop I25 and inductor I50 causes a re
sistance variation in the temperature-variable " through said slot into mechanical-coupling en
gagement with said adjustable member and said
bolometer element I I5 which disturbs the bal
driving member for e?ecting a displacement of
anced condition of'the bridge network. Resistor
lation generator I55.
Each of the described embodiments of the in
vention features a line arrangement in which
the space requirements are minimized. This‘re
4. A transmission line of adjustable electrical
length comprising, a ?rst hollow conductor, a
second conductor having an axially extending slot
and coaxially disposed within said ?rst conduc
tor, an adjustable member movable in a prede
termined path in the space between said con
ductors for varying the electrical length of the
transmission line including said conductors, a
driving member disposed within said second con
ductor for exerting a controllable driving force
sults from the fact that the physical dimensions
of the line remain constant irrespective of the
tuning adjustments. Also, in each case the driv
ing member for displacingr the short-circuiting
element is made of steel stock which is particu (30 along said line, and means projecting through
said slot into mechanical-coupling engagement
larly desirable from the mechanical standpoint,
with said adjustable member and said driving
while the line conductors have a construction de~
member for effecting a displacement of said ad
sired to attain optimum electrical characteristics.
justable member along said path' by said driving
Furthermore, the driving members may be lubri
member.
eated as required without disturbing the con
5. A transmission line of adjustable electrical
ductive characteristics of the line conductors.
length comprising, a ?rst conductor, a second
While there have been described what are at
conductor havingv an axially extending slot and a
present considered to be the preferred embodi
predetermined spaced relation to' said ?rst con
ments of this invention, it will be obvious to
those skilled in the art that various changes and
ductor, an adjustable member supported by at
modi?cations may be made therein without de
least one of said conductors‘ and movable there
parting from the invention, and it is, therefore,
along in the space between said conductors for
aimed in the appended claims to cover all such
varying the electrical length of the transmission
changes and modi?cations as fall within the true
line including said conductors, a driving member
75 disposed within said'second- conductor for exert
spirit and scope of _the invention.
2,407,147
a
ing a controllable driving force along said line,
and means projecting through said slot into me
driving member including a rotatable lead screw
disposed within said second conductor for exert
ing a controllable driving force along said line,
and a threaded member extending from said ad
justable member through said slot and meshing
with said lead screw for effecting a displacement
of said adjustable member along said path by
chanical-coupling engagement with said adjust
able member and said driving member for effect
ing a displacement of said adjustable member
along said one. conductor by said driving member.
6. A transmission line of adjustable electrical
length comprising, a ?rst conductor, a second
conductor having an axially extending slot and
a predetermined spaced relation to said ?rst con
10
transmission line including said conductors, a
10
ductor, an adjustable short-circuiting member
engaging each of said conductors and movable
therealong in the space between said conductors
for varying the electrical length of the transmis
sion line including said conductors,‘ a driving '
said driving member.
10. A transmission line of adjustable electrical
length comprising, a ?rst hollow axially-slotted
conductor, a second axially-slotted conductor 00
axially disposed within said ?rst conductor, an
adjustable member movable in a predetermined
path in the space between said conductors for
member disposed within said second conductor
varying the electrical length of the transmission
for exerting a controllable driving force along
line including said conductors and having a pro
said line, and means projecting through said slot
jection extending through said slots of said ?rst
into mechanical-coupling engagement with said
and second conductors to indicate the position
adjustable member and said driving member for 20 of said adjustable member, and a driving member
e?ecting a displacement of said adjustable mem
disposed within said second conductor for exert
ber along said conductors by said driving mem
ing a controllable driving force along said line
ber.
and mechanically engaged by said projection for
7. A transmission line of adjustable electrical
e?ecting a displacement of said adjustable mem
length comprising, a ?rst conductor, a second 25 ber along said path.
conductor having an axially extending slot and
11. A transmission line of adjustable electrical
a predetermined spaced relation to said ?rst cone
length comprising, a, ?rst axially-slotted con
ductor, an adjustable member movable in a preductor, a second axially-slotted conductor dis
determined path in the space between said con
posed in spaced relationship to said ?rst con
ductors for varying the electrical length of the 30 ductor, an adjustable member movable in a pre
transmission line including said conductors, a
determined path in the space between said con
driving member including a rotatable lead screw
ductors for varying the electrical length of
disposed within said second conductor for exert
the transmission line including said conductors,
ing a controllable driving force along said line,
a pair of similar driving members disposed with
and means projecting through said slot into me
in said ?rst and second conductors respectively
chanical-coupling engagement with said‘ adjust
for individually exerting a controllable driving
able member and said driving member for effect
force along said line, unicontrol means for actu
ing a displacement of said adjustable member
ating said driving members, and means projecting
along said path by said driving member.
through said slots into mechanical-coupling en
8. A transmission line of adjustable electrical 40 gagement with said adjustable member and said
length comprising, a ?rst conductor, a second
pair of driving members for effecting a displace
conductor having an axially extending slot and
ment of said adjustable member along said path
a predetermined spaced relation to said ?rst con
by said pair of driving members.
ductor, an adjustable member movable in a pre
12. A transmission line of adjustable electrical
determined path in the space between said con 45 length comprising, a ?rst axially-slotted conduc
ductors for varying the electrical length of the
tor, a second axially-slotted conductor disposed
transmission line including said conductors, a
in spaced parallel relationship to said ?rst con
driving member disposed within said second con
ductor, an adjustable member movable in a pre
ductor for exerting a controllable driving force ~ determined path in the space between said con
along said line, and means secured to said ad 50 ductors for varying the electrical length of the
justable member and projecting through said slot
transmission line including said conductors and
into mechanical-coupling engagement with said
having a pair of projections extending through
driving member for effecting a displacement of
said slots of said ?rst and second conductors re
said adjustable member along said path by said
spectively, a pair of similar driving members dis
driving member.
55 posed within said ?rst and second conductors
9. A transmission line of adjustable electrical
respectively for individually exerting a controlla
length comprising, a ?rst conductor, a second
ble driving force along said line and mechanically
conductor having an axially extending slot and
engaged by said pair of projections for e?ecting
a predetermined spaced relation to said ?rst con
a displacement of said adjustable member along
ductor, an adjustable member movable in a pre
said path, and unicontrol means for actuating
determined path in the space between said con
said driving members.
ductors for varying the electrical length of the
NICHOLAS V. FEDO'I'OFF.
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