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Патент USA US2408037

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Sept. 24, 1946.
D. BELLARE
2,408,034
DIRECTION ' FINDER ANTENNA
'Filed May 14, 1945
" 5 Sheets-Sheet 1'
‘INVENTOR.
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BY /‘7 //4;; ,
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Sept.‘ 24, 1946.
D. BELLARE
DmEcTIoN‘FINnER ANTENNA
Filed May 14,, 1945
‘
2,408,034
'
’
'
5 Sheets-Sheet 2
IN VEN TOR.
' DIYV/O 85M ?/FE
ATmFNEY
'
Sept. 24, 1946.‘
D. BELLARE
2,408,034?
DIRECTION FINDER ‘ANTENNA
Filed ‘may 14, 1945
BY
,5‘ sheets-sheet 5
47/“???
A TTOIPNEY
Sept. 24,1946. >
> b, BELLARE
2,408,034
DIRECTION FIKDER ANTENNA
_
' 62
Filed May 14, 1945
65
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Sept. 24, 1946,
‘
D; BELLARE
'
2,408,034
DIRECTION FINDER ANTENNA
Filed ‘May 14, 1945
5 Sheets-Sheet 5
a 45
IN VEN TOR.
‘DAV/0
BéZZ/l/FE
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ATTORNEY
Patented Sept. 24, 1946
2,408.034
UNITED “STATES
ATENT OFFICE
DIRECTION FINDER ANTENNA
David Bellare, Brooklyn, N. Y., assignor to Fed- ‘
oral Telephone and Radio Corporation, New
York, N. Y., acorporation of Delaware
Application May 14, 1945, Serial No. 593,604‘ '
8 Claims. (01. 250-33)
1
2 .
"This invention relates to improvements in di
rection ?nder antennae and more particularly to
a crossed loop wave collector used with :a sensing
antenna in direction ?nding detection.
My invention provides certain improvements
in ‘the construction, arrangement of parts‘ and
effectiveness .of loop antennae used in direction
?nding systems.
‘
‘
An objection of this invention is to provide a
novel improved‘ antenna assembly ‘including
crossed loops, sense antenna and counterpoise,
which ‘is especially adapted for use in connection
with direction ?nding systems either of a port
able or ?xed character.
‘
Referring to Figs. 1 and 2, ‘the antenna assem
bly includes a vertical supporting memberor rod
1 from the vertical midpoint of which extend
four radial arms 2 ‘spaced ‘90° ‘relatively to one
another, and attached to the‘rod I by an insu
lating connector 3, providing rigid support for
the arms 2. The bottom of the supporting rod I
is held’ in a strengthening support ll ‘which, in
turn, is ‘mountedfupon a generally cylindrical
vbase member 5; The latter, in turn, may be at
tached to any suitable supporting rod or antenna
mounting shaft or mast. ‘ The 'four arms Z'may
be interconnected‘ by“ bracing bars ‘65 attached
thereto ‘by suitable insulated clamping device ‘l.
‘Another object of this invention is ‘to provide 15' The crossed loop may be formed by two ?ex
an ‘antenna ‘assembly of compact ‘and rugged
ible shielded cables 6 ‘and v9, the apices of which
character‘ particularly adapted for ruse‘ on
pass through a, top mount Ill attached to sup
vehicles.
‘
porting ‘rod I, the ends rof which are fastened
A further object of this invention is directed
within the base'member '5 and the central por
to "providing an antenna assembly including 20 tions of which are’ held by fastening devices H
crossed loops, sense antenna, and rcounterpoise in
on the endsof the respective arms 2. Above the
which the ‘sense antenna and counterpoise are
top mount it may be ?xed an insulating and
interconnected by a shielded dummy loop network
weatherproo?ng cap. l2 which supports insulator
immediately adjacent thereto.
Another object of my invention is the utiliza
tion of the supporting cross arms of the loop an
tenna as counterpoise members. for ‘a vertical
antenna.
A still ‘further object of my invention is the
means‘ it surrounding the vertical sense an
tenna ‘l4.
-'
.
"
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>
In Fig. "'3 I have shown details of the protecti
ing and insulating cap l2 of the present inven
tion. This ‘combination of top mount Ill and in
sulating cap 12 serves to provide support at the
provision of additional counterpoise members, 30 apices of shielded cables 8 and 9, as well as means
orientation of which can be altered for initial
of support and insulation of vertical sense an
adjustments. These ‘additional counterpeise ele
tenna M. The mount it consists of a tube of
ments may be adjusted in vertical {angle to com
proper length, ?ared outwardly at a 45° angle at
pensate for possible directional errors.
‘
the top. The sloping sides l5 are ‘formed with
With the foregoing and ‘other objects in view,
four special openings It to receive the shielded
advantages of my invention will become appar
cables and-insulating bushings, more fully de
ent from the following description; illustrated in
scribed in copending applications of Trevor H.
the accompanying drawings wherein:
Fig. 1 is a vertical view in elevation of an an
tenna assembly according to my invention;
Fig. 2 is a top plan view of the general antenna
assembly illustrated in Fig. 11;
i
Fig. 3 is an enlarged cross-sectional view of the
upper portion of the loop antenna assembly in
accordance with my invention;
‘
‘Clark, S. N. 478,081, ?led March 5, 1943.
‘ The vertical sense antenna 14 passes upward
40 close by the apices of the loops of shielded cable 8
and 9. In order to prevent shorting, the insula
tion means l3 includes an insulating bushing li
mounted at the‘center of circular plate vl8 on
weatherproofing cap; l2, with the vertical sense
antenna
It passing upwardly therethrough.
‘Fig. 4 is an enlarged vertical view of the upper
portion of the ‘loop antenna assembly, with the
‘Further protection and support is provided at this
Weatherproo?ng cover removed;
In Fig. 4 a plan- view of the loop antenna shows
provision for the displacement of cables 81 and’ 9
‘
_
Fig. 5 is an enlarged cross-sectional'view of the
point ‘by ceramic insulator l9.
'
‘junction point'of counterpoise and vertical sense .50 in juxtaposition with the verticalantenna I4.
antenna ‘at’ a‘ point 'midwav of the supporting
As an alternative it would be possible to construct
‘m‘asty
"
“
'
Y
'
Fig. ‘6 is a View in plan of afurther embodiment
the loops in the usual ‘manner, while mounting
the verticalantenna oil-center of its base, in or
‘
‘
'
"
der to provide clearance ‘at the .apices of the
Fig.7 is a‘ fragmentary view of a detail of Fig; 6. 55 crossed loops. ‘ ‘In Fig. f1 the vertical antenna I 4
loflthe invention; and
2,408,034
3
crowds the two crossed loops 8 and 9 to one side,
but such a change in position of these portions of
cables 8 and 9 does not effectually alter the con
stants or characteristics of the loop antenna.
The .central portion of the loop structure,
showing details of construction and electrical
connections, is illustrated in Fig. 5. The radial
arms 2 are supported in insulating bushings 20
and 2! composed of a circular insulator '22, a
?anged collar 23, and a ring nut 24. The armgZ ‘
has a threaded portion 25 to engage in internal
threads 25 of collar 23. The arms 2 may be em
ployed not only as a means of support for the
loop structure but also as a counterpoise for the
sense antenna
[4.
'
Y
4.
a counterpoise array supported above the loops.
The rigid construction is particularly suitable for
use on vehicles, and for use in areas of limited
clearance.
'
The feature incorporated in my invention
wherein the sense antenna and counterpoise are
interconnected by a shielded dummy loop net
work immediately ‘adjacent thereto provides an
assembly of maximum efiiciency, due tonegligi
ble losses in transmission leadins.
-As will also be clear, the use of additional
counterpoise members so constructed as to be
variable in orientation is a novel feature of my
invention. Simple adjustment of these addition
15 a1 arms provides a means of compensation'for
.
At the internal end of each arm 2 there is a
terminal screw 21 tapped into the end of the arm,
possible directional errors.
For the sake of clarity, my invention has been
described in some detail. However, various ,
holding a lug 28 connected in turn‘ by lead 279 to
structural details given have been shown by way .
bolt 30 through lug 3!. Bolts 30 serve to hold
in position an insulating block 32 supported on 20 of examples, and not as ‘a limitation on the scope
of my invention as set forth in the objects and
?ange la of supporting tube I. Supported on
accompanying claims.
' .
insulating block 32 is the vertical antenna l4
with a thickened base 33. A bolt 34 formed in
1. A wave collector comprising a vertical sup
tegrally with base 33 is passed through insulat
porting memberpa pair of antennaloops 'posi
ing block 32 and secured by hex nut 35 which
tioned substantially at right angles to each other
also secures lug 36. A lead 3'! from lug 36 passes
and having the common axis thereof in common
through'an insulator 38 mounted on shielding
with the vertical axis of said member, a plurality
can 39. ‘The leadins 40 to a dummy loop from
of arms extending radially of said member at a
each of the bolts 30 are brought from lugs'4l
held by nut 42 through insulators 43 into the 30 location within the area of said loops, a vertical
sensing antenna extending upwardly from said
shielding can 39. The dummy loop 44, more
member from a point adjacent said arms'and
particularly described in the aforementioned ap
means for coupling ‘said. arms as a counterpoise _
plication of Trevor H. Clark, showing proper por
to said sensing antenna.
.
tioning'of circuits, assumes balancing'of circuits
2. A wave collector according to ‘claim, 1, fur
so that the resonant frequency as determined by 35
ther including means for supporting the outer
the capacity of the vertical antenna to the radial
portions of said loo-ps'on at least certain. of said
arm counterpoise, the shielded loop and mast, the
I
claim:
’
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'
,
.
capacity of the counterpoise to the shieldedloop
3. A wave collector according ‘(to claim 1 where- j
and mast, the internal capacities of the wind
ings 'of the dummy loop network, and internal 40 in at least certain of said arms includemeans
for orientation of such arms in vertical planes
shield, will be greater than the operating fre
common to the vertical axis of said supporting
quency of the loop.
'
The entire shielding can 39 may be suitably
member.
4. A wave collector comprising a vertical sup
mounted by some means such as shown by the
?ange 45 supporting an insulating base 46 held 45 porting member, a pair‘ of antenna loops posi
tioned substantially at right angles to each other
in place by bolt 41 and nut 48. Leads 49 from
arms.
thejdummy loop network 44 pass through the
insulating base 46, ending in terminals 50.
For the purpose‘of properly proportioning the
'
'
and having the common axis thereof in common
with the vertical axis of said member, a plurality
of arms extending radially of said member to
vertical‘sense antenna I4 to the counterpoise 50 support the outer portions of said loops, means
to insulate said arms from said member and said
arms 2 in‘ their resonant circuit, such vertical
loops. a vertical sensing antenna extending up
antenna may be so constructed as to be adjust
wardly from said member from a point adjacent
able in length.
said arms, and means for coupling said armsas
In order to provide means for adjustment of
7
'
any additional radial arms used as counterpoise 55 a counterpoise to said sensing antenna.
5. A wave collector comprising a vertical sup
members, a system illustrated in Figs. 6 and 7
some of which are adjustable in the vertical
porting member, a pair of antenna loops posi
tioned substantially at right angles to each other
plane.
is shown, including a plurality of radial arms,
Alternate arms, for example, are each
and having the common axis thereof in common
shown to include a stub 5| for connection with
extension 52 by means of tongues 53, 54, and a
with the vertical axis of said member, a plurality
of arms extending radially of said member at a
bolt 55.
location within the area of said loops, avertical .
’
This construction allows for orientation in the
sensing antenna extending upwardly from said
vertical angle of 180°, whichrmay be utilized to
member from a point adjacent said arms, and a
compensate for possible directional errors. If 65 dummy loop network located adjacent said. point
desired, connecting bars like the bracing bars 6
for'coupling said arms to said sensing antenna.
in Fig. 2 may be included, but if included the ad
6. A wave collector comprising a vertical','sup
justable arms 5!,’ 52 must be short enough to
porting member, a pair of antennafloops posi
clear the bars 6‘, or be limited in their adjust
tionedsubstantially at right angles to each other
ment.
‘
'
and having the common axis thereof'in common
with the vertical axis of said member, a plurality
of arms extending radially ofsaid memberi and
diametrically of said loops,; a -vertical._scnsing
'
.From the foregoing itwill be clear that the
utilization of the four radial supporting arms 2
as a counterpoise array for the vertical sense an
tenna l4 contributes to a more‘ compact and
rugged construction than wouldbeobtainedwith
75
antenna Jextending upwardly from"the'; junction
5
2,408,034
of said arms, and means for coupling said arms
as a counterpoise to said sensing antenna.
7. A wave collector comprising a vertical sup
tioned substantially at right angles to each other
and having the common axis thereof in common
with the vertical axis of said member, a plurality
of arms extending radially of said member at a
porting member, a pair of antenna loops posi
tioned substantially at right angles to each other
location within the area of said loops, means con
necting certain of said arms in insulated. relation
with respect to the outer portions of said loops
to support said loops, others of said arms being
provided with means for adjusting a part thereof
laterally with respect to a plane common to said
certain arms, a vertical sensing antenna extend
ing upwardly from said member from a point
adjacent the junction of said arms, and means
and having the common axis thereof in common
with the vertical axis of said member, a plurality
of arms extending radially of said member and
diametrically of said loops, means to support the
outer portions of said loops from at least certain
of said arms, said arms being insulated from said
members and said loops, a vertical sensing an
tenna extending upwardly from the junction of
said arms, and means for coupling said arms as
a counterpoise to said sensing antenna.
8. A wave collector comprising a, vertical sup
porting member, a pair of antenna loops posi
for coupling said arms as a counterpoise to said
15
sensing antenna.
DAVID BELLARE.
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