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Патент USA US2132881

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Oct. 11, 1938.
J. R. RIGANDI
2,132,881 -
TUNED ANTENNA SYSTEM
Filed Oct. 19, 1936
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JOSEPH E P/GA/vzw.
INVENTOR.
ATTORNEY5__
Patented Oct. 11, 1938
‘2,132,881
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PATENT OFFICE
2,132,881 »
TUNED ANTENNA SYSTEM
Joseph Ruig Rlgandi, WesterleiglnN. Y.
v‘Application October 19, 1936, Serial No. 106,281 I
_ 7 ' Claims.
This "invention relates tone'w‘ and useful im
provements in‘ radio apparatus and more par
ticularly it pertains to antenna systems therefor,
and this application is a ‘continuation in. part of
5
prior application ?led November 30, 1934,v
Serial Number .755,3'76, Patent No. 2,058,037,
dated'wOctober 20, 1936.
.
.It, is one object of the present invention to
7 provide a new and improved form of antenna
1
which -is capable of adjustment and tuning to
meet local requirements and particular set con
ditions.
'
c
.-
.
.
'
vide a new and improved antenna system which
will materially simplify tuning. and improve re
reception andoperationof radio receiving sets.
“With the above and other objects in view, ref
erence will be had to the accompanying drawing,
in which:
7
,
Figural is .a diagrammatic view illustrating an
antennaconstructed in accordancewith the pres
ent
invention,
,
g
7
,
variable condenser I6 will serve to tune the an
tenna circuit to the proper frequency of the re
ceiver and will also actto vary the volume of
the set. Furthermore, the .volume may also be
controlled by operation of the movable member
I5 of the variable resistance I6’.
In Figure 2, the reference character 30 desig
nates an outside antenna, the lead of which is
connected to a switch 3| by means of, which the
antenna may be connected or disconnected with
one end of the primary winding 32 of an induc
tion coil. B.
-
, It>is a' further object of the invention to pro
20
(01. 250-20)
.
c
Figure 2 is a diagrammatic view illustrating a
modi?ed form of the invention,
25 ‘Figure 3 is a diagrammatic view illustrating a
further modi?ed form of the invention,
Figure 4 is a diagrammatic view illustrating, a
further modi?ed formof the invention, and;
Figure 5 is a similar view illustrating a still fur
"9 ther modi?ed form of the invention.
Referring in detail to the drawing and particu
larly to Figure 1, A designates an induction coil
which consists of a primary winding l0 and a sec
_ ondary winding H. The primary winding forms
3" a continuation of the antenna wire or its lead-in
The reference numeral 33 desig
nates the secondary winding of the induction coil
B and one end of this secondary winding 33 is
connected as at 34 to a conductor 35 leading from
5
the opposite end of the primary winding 32, and
interposed between the secondary winding 33 and
the point 34 where it is connected to the primary
winding 32, there is a variable condenser .36.
Leading from the secondary winding 33 there is
O
a conductor 31 which is connected as at 38 to the
movable member 39 of a variable resistance 40.
The conductor-35 is connected as at 4| to. the
ground side of the primary winding_42 of the
tube circuit, the secondary winding ‘of this tube
circuit being designated 43. The reference char
acter 44 designates a ?xed condenser which is
electrically. connected to the variable resistance
40 and leading from the ?xed condenser 44 and
electrically connected as at 4| to the ground side 30
of the primary winding 42 of the tube circuit,
there is a conductor 45'which is electrically con
nectedas-at “and 41 to the secondary winding
43 of thetube circuit. Interposed between the r
two points, of connection 46 and 41 there is a 3°
which is herein designated l2. Leading from one
end of the secondary winding ll there is a con
variable condenser 48 and in said conductor 45,
ductor I3 which is electrically connected, as at I4,
In Figure 3,, the reference character G desig
there is a ?xed condenser 49.
to the movable member [50f a variable resistance ‘nates an induction coil of which 50 .is the pri
‘10 l6’. Interposed in the conductor l3 thereis a mary winding, the’ secondary winding being desig
variable condenser 16 and it will be noted that one nated 5|. leading from one end vof the winding
end of the primary .winding In of the induction 5| there is a conductor>52 connected as at 53 to
coil A is electrically connected as at I‘! to the the-ground and also to the ground side of the
_ conductor I3 at a point beyond the variable con
denser IB. Leading from the secondary winding
ll of the induction coil A, there is a conductor
I8 which is connected as at l9 to the ground post
of a radio receiver designated‘ 20. The variable
50 resistance heretofore- mentioned is connected at
one of its ends to the antenna post of the receiver
20, the other end being connected to the ground
and interposed between the variable resistance
and the ground, there is a ?xed condenser 2|.
55' From the foregoing it will be apparent, that the
winding H as at 54. The opposite end of the sec-
,.
ondary winding 5| has an extension conductor 55
which is connected as at 56 to the primary wind
ing 50 and by the conductor 51 to a conductor 58
which includes the resistance element 59 of a
variable resistanca'which is also connected to 5
ground ‘.at 53. The movable element SI of the
variable resistance is connected by a conductor
62 to'the grid 63 of the tube of the ?rst stage of
radio; frequency.
1 InFigure 4 I have illustrated a further modi- 55
2
2,132,881
?ed form of the invention in which there are
two antennae employed. The antennae are
designated 10 and H. The antenna 10 is con
nected by a suitable lead ‘I2 to the primary wind
ing 13 of an induction coil 14, and there is a
switch v15 included in this‘ conductor 12. The
I25 as at I36, and this conductor I35 includes
a variable condenser I31.
Leading from one end
of the secondary winding I32 of the induction
coil I28 there is a conductor I39 which is con
nected to the movable member I40 of a variable
resistance I4 I, and one end of the primary wind
other end of the primary winding 13 is connected
ing I21 of the induction coil I28 is connected
as at 16 to a conductor 11, which in turn :is con
with this conductor I39 as at MI’, by means of
a suitable lead I42. The opposite end of the
nected to one end of the secondary winding'18 of
10 said induction coil 14, and in this conductor
there is'interposed a variable condenser 19. The
other end of the secondary winding of the in=
primary winding I21 is connectedto ground by
means of a conductor I43. The opposite end
to that heretofore mentioned of the secondary
duction coil 14 is connected by means of a con-, _ winding I32 of the induction coil 128 is con
ductor 30 to a mid-tap 8| in the primary Wind'- ‘ nected by means of conductors I44 and I45 to,
15
15 ing 82 of an induction coil 83 and the conductor ' the resistance element I46 oi‘ the variablelresist
11, heretofore mentioned, is connected as at B4 ance, and a ?xed condenser I41 is interposed in
to a mid-tap in the secondary winding 85 of the this conductor. In this form of the invention
induction coil 83. The opposite end of the pri
mary winding 3| of the induction coil 83 is cone
20 nected by a lead 86 with the antenna H, and this
conductor includes a switch 81.
One end of the
secondary winding '85 of the induction coil 83 is
connected by a conductor 88 to the movable
member 89 of a variable resistance 90 and this
conductor includes a'variabie condenser 90'.‘
The opposite end of the said secondary winding
85 is connected by a conductor 9I to the movable
member 92 of a switch, which movable member is
adapted for engagement with a contact 93 from
30 which leads a conductor 94. Leading from the
conductor 94 to ground there is a conductor 96
and the resistance element 91 is connected to this
conductor 96 as at 98. Leading from the oppo-o
site end of the resistance element 91 there is a
35 conductor 99, whichvis connected to the grid £00
of the ?rst stage of radio frequency of a receiving
set. Connected to the conductor 95 as at i0I
there is a lead I02 which is connected to the
primary Winding I03 of an induction coil I04
40 and the other terminal of said primary winding
the reference numeral I50 designates the ?rst
stage of radio frequency of a conventional re
ceiving circuit and leading from the grid there
20
of there is a conductor’ I5I which is connected to
a conductor I52 having a movable switch ele
ment I53. This movable switch element I53 is
adapted to contact with one of a plurality of
points I54, I55, I55 and I51, and these points 25
are tapped upon a coil or winding, I58.
The
?xed element I46 of the variable resistance is
connected by a conductor I60 vto the ‘contact
point, I51, and the ?xed element of the variable
resistance, heretofore mentioned, is connected in 30
shunt with'the winding L.
'
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From the foregoing it will be apparent that
the present invention provides in various modi-'
?ed forms, a ‘tuned antenna circuit in which
clearer signals, reduced interference, and greater 35
volume is obtained, and that in its broadest aspect
these results are accomplished by reason of the
fact that said‘ antenna circuit includes one or
more induction coils together with means for
tuning the signal energy in ,each'oi the windings 40
site end of the secondary winding of the induc
of said coils, and while the invention has been
herein disclosed in its preferred forms I do not
wish to be speci?cally limited to the speci?c con
structions illustrated since the invention may be
carried out in other forms within the scope of 45
tion coil I04 is connected as at III to the con
the appended claims.
I03 is connected by a conductor I05 to a con
ductor I06 leading from the secondary winding
I01 of the induction coil I04, and this conductor
I05 includes a variable condenser I I0,
The oppo
ductor 99, heretofore mentioned.
By this arrangement it will be apparent that
either of the induction coils 14 or 83 may be in
50 eluded, in the antenna circuit, or both may be
included, or both may be excluded from the
antenna circuit. Furthermore, by reason of the
fact that the windings of each of the induction
coils are electrically coupled, the incoming signal
55 energy of these coils may be varied by the vari
able condensers in the circuit of each coil.
In Figure 5 I have shown a still further modi
?ed form of the invention in which I20 desig
nates an antenna from which extends a lead in
The lead in includes a switch I22 and is
60 IEI.
connected to the primary winding I23 of an in
duction coil I24. Leading from the opposite end
of the primary winding I23 there is a conductor
I25, and this conductor 'i25 is connected as at
I26 to the primary winding I21 of an induction
coil I28, the connection being made substantially
mid-way between the end turns of said winding.
rThe reference numeral I30 designates the second
ary winding of the induction coil I24, and ex
70 tending from one end thereof, there is a con
ductor I3I which is connected nLid-way between
the ends of the secondary winding I32 of the
induction coil I28. The opposite end of the
winding I30 of the induction coil I24 is connected
75 by means of a conductor I35 to the conductor
7
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Having thus described the invention, what is
claimed as new, is:
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1. An antenna ‘circuit adapted to bebuilt into
a conventional radio receiving circuit, said an
tenna circuit including an inductance coil, hav
ing a primary and. secondary winding a variable
condenser electrically connected to both the pri
mary and secondary winding and a variable re
sistance, a ?xed condenser in series with said 55
variable resistance, a connection connecting said
variable resistance'in shunt with the input of
the ?rst tube of a conventional receiver circuit
and variably connected to both the primary and
secondary winding of the inductance coil, an ex 60
terior antenna wire,
a switch for connecting
and disconnecting said antenna wire to the pri
mary winding of the inductance coil.
2. A double antenna circuit comprising in com
bination with a conventional radio receiver and 65
its ?rst vacuum tube stage, two antenna circuits
each antenna circuit including an inductance
coil, each of which coils includes a primary and
a secondary winding, a variable condenser in
cluded in each antenna circuit for tuning the 70
signal energy of the circuit, each of said variable
condensers being ‘connected to the primary and
secondary winding of its respective'inductance
coil, means for controlling the ‘volume before the
signal reaches the ?rst vacuum tube stage of the 75
3
2,182,881
said conventional radio receiver, said means in
cluding a variable resistance, said variable resist
ance being connected to the primary and the sec
ondary windings of the antenna circuit, a plural
ity of antennae, and means for electrically con
necting and disconnecting said antennae to one
side lead of each primary winding.
3. A double tuning antenna circuit including
two inductance coils, each having a primary and
If)
secondary winding the primary and secondary
windings of one of said inductance coils being
electrically connected respectively with the pri
inductance coil of the receiver and the inductance
coil of the antenna system.
6. In an antenna system, an antenna, an in
ductance coil, including a primary and secondary
Winding means for connecting one of the leads of
the primary winding of said inductance coil to
said antenna, a variable condenser connected to
one lead of the primary winding and to one lead
of the secondary winding of said inductance coil,
a variable resistance connected in series to the 10
inductance coil and connected in shunt to the
variable condenser, said variable resistance being
mary and secondary windings of the other of said
inductance coils at a point intermediate of the
ends of said windings, and means for varying the
signal energy of each inductance coil, said last
variably connected to one lead of the primary
winding and to one lead of the secondary wind
ing of said inductance coil, a vacuum tube radio
mentioned means including a variable condenser
tube circuit including an inductance coil, a vari
electrically ‘connected on one side to the primary
windings of both of said inductance coils and
upon the other side to the secondary windings
of both of said inductance coils.
4. In combination with a radio receiving cir
cuit employing vacuum tubes, an antenna system
including an antenna, an inductive coupling for
able condenser shunt connected to the secondary
winding of said second mentioned inductance
connecting the antenna to the said receiving set,
said iductive coupling including an inductance
coil, including a primary and secondary winding
a variable condenser connected to one lead of the
primary winding of said inductance coil and to
one lead of the secondary winding of the induc
tance coil, and means for electrically connecting
the other lead of the primary winding of the in
ductance coil to the grid circuit of the ?rst vac
uum tube of the radio receiving circuit, means
35 for connecting the other lead of the secondary
winding of said induction coil to the ground cir
cuit of the radio receiving ‘circuit, and a variable
resistance interposed between the antenna sys
tem and the said receiving circuit.
5. An antenna system comprising in combina
tion with a radio receiving circuit including a
vacuum tube, an inductance coil and a variable
condenser, said antenna system comprising an
inductance coil, including a primary and sec
ondary winding a variable condenser connected
to both the primary and secondary winding of
the inductance coil, and means for connecting
the antenna system to the receiving circuit, said
means comprising a variable resistance electri
50 cally connected to and interposed between the
frequency ampli?cation circuit, said vacuum
coil, a condenser connected to one side of the
primary and to one side of the secondary winding
of said second mentioned inductance coil, and
means for connecting the antenna system to the
primary winding of the inductance coil of the
vacuum tube circuit, said means including said
variable resistance.
7. In an antenna system, including double an
tenna wires, two inductance coils, each of said
inductance coils having a primary and a second
ary winding, the primary and secondary winding 30
of one of said inductance coils having electrical
connection with the primary and secondary
winding of the other inductance coil, a variable
condenser for each of said inductance coils, a
variable resistance including a series condenser
variably connected to one lead of the primary
and to one lead of the secondary of one of said
inductance coils, a vacuum tube radio frequency
ampli?cation circuit, said vacuum tube circuit
including an inductance coil, a variable condenser 40
shunting said inductance coil, and means for con
necting the antenna system to the inductance coil
of the vacuum tube circuit, said means including
said afore-mentioned variable resistance shunt
connected to the inductance ‘coil of the vacuum
tube circuit, and a switch for each of said ?rst
mentioned inductance coils for connecting and
disconnecting said double antenna wires with
said ?rst mentioned inductance coils.
JOSEPH RUIG RIGANDI.
50
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