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De@ 31, 1946- _
DE wlTT R. GODDARD
SECTIONAL PARABOLIC ANTENNA SYSTEM
Filed June 24, '1943
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Dec.> 31, 1946.
2,413,558
DE WITT R. GoDDARD '
SECTIONAL PARABOLIC ANTENNA SYSTEM
Filed June 24, 1945
2 Sheets-Sheet 2
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2,413,558
Patented Dec. 31, 1946
UNITED STATES ' PATENT OFFICE
2,413,558
sEcfrIoNAL PARABOLIC ANTENNA SYSTEM
De Witt Rugg Goddard, Riverhead, N. Y., assignor
to Radio Corporation of America, a corpora
tion of Delaware
Application June 24, 1943, Serial No. 492,032
9 Claims. (Cl. 250-11)
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1
Referring/now in detail to Figs. 1, 2 andïß of
This invention relates to a new and useful split
lParabolic antenna system for use with an ultra
the drawings, .the center section l is shown
mountedfupon a telescoping tripod 2. On each
high frequency radio transceiver.
side of the center section there are located side
sections or wings 3 and 4 which are arranged to be
detached from the center section I by means of a
An object of this invention is to provide an
efficient light weight compact portable parabolic
antenna for use in ultra high frequency systems
flat arcuate clamp strip 5. The end portions of
for two-way voice communication. My invention
the side sections are riveted to an angular mem
is particularly useful for short waves of the order
of ten centimeters in length.
ber 6 which is arranged to slide under the arcuate
'
Another object of this invention is to provide a 10 strip 5. The side sections 3 and 4 are attached
and detached by .a thumb screw 1~ which engages
portable waterproof three-piece parabolic an~
the slots 8 in the angular portion 6 and passes
.tenna in which each separate portion is insulated
through the arcuate strip 5. The angular mem
from the other.
ber 6 is provided with a plurality of slots 8 which
My invention employs a novel construction
wherein a parabolic reflector is split into three 15 are shown more in detail in Fig. 3 of the drawings.
It will be seen that the thin parabolic reflecting
pieces, namely, a center section and two side
surface 3 has Ithe special aluminum angular por
sections. Suitable means for removably fasten
tion 6 riveted thereon by means of rivets 6A.
ing the sides on the center section are provided.
This angle material contains a circular perfora
A feature of this invention resides in the fact
that the center section of the parabolic reflector 20 tion 5A located »at the top and several half round
notches 8 which are distributed along its edge.
serves to form a portion of a control box which
The main center section or box portion l con
houses the radio frequency unit and is arranged
tains an arcuate strip 5 which is held in position
with another box or cover portion to house the
by means of three loose fitting rivets SB and the
side sections and other devices.
Parabolic reflectors are old in the art, there 25 knurled thumb screw ’l clamps the side sections
3 and 4 together. At the upper left hand corner
being many different arrangements. Generally,
of the box portion a stud 5B protrudes about one
they are large in size, and therefore cumbersome>
quarter of an inch beyond the surface of the
and heavy to carry. This invention overcomes
‘ strip '5. The threaded .brass plate 1A is arranged
these objections since by splitting the reflector
into three major component parts, capable of 30 to receive the .threaded thumb screw 1. The plate
1A is fastened to the sides of the wood box I by
being -readily assembled, detached and stored
lmeans of small screws 1B. The center section
away in a suitable container, portability, without
or box portion l is provided with a metallic con
loss of electrical ei'liciency, as will be explained
nection bushing 9 which is arranged to receive a
later, is insured.
`
The parabolic reflector of this invention is par
`ticularly adapted for forming the antenna system
of Aa portable two-way voice radio communication
system operating at a wavelength of about ten
centimeters, although, obviously, the invention is
not limited to operation at this frequency. The 40
antenna system described herein is intended to be
used with a transceiver similar to -theone de
scribed in a copending application of K. MacLean
and DeWitt R. Goddard, filed May 20, 1943, Se
rial No. 487,722.
A
detachable antenna radiator member I0. Radia
tor I0 is in the form of a simple dipole located'
at the end of a coaxial transmission line (not
shown) 'and isolated therefrom by two quarter
wave sections.
In front of the dipole 10A and
insulated therefrom, is another dipole 10B which
is used as .a reflector. The latter is insulated from
IBA since it is molded in thermoplastic insulating
material such as lucite or polystyrene. The ar
rangement as a whole is such as to throw the ma
45 jority of the radiations against the parabolic re
flecting surfaces I, 3 and 4 of the reflector. The
lower portion of the center section has located
therein a threaded ?ange member Il which is
threaded at ,l2 to receive a clamping bolt i3 for
reflector of this invention,
,
Fig. 2 is a cross-section taken on 2-2 of Fig. l, 50 securing the center section to the tripod 2. To
the right of flange H there is located a connec-Fig. 3 is a perspective View partly in section
tion socket I4 which is arranged to receive ya
showing a portion of one of the side sections;
plug and'cable i5 which connects thef radiator
Fig'. 4' is a perspective 'view of the box portion
l0 and transceiver to the battery and vibrator
formed by the center section of the parabolic re
55 power supply box I6 located at the base of the
flector, and
tripod. Connection is made from radiator I0 and
v Fig. 5 is an end view of Fig. 4.
This invention will best lbe understood by re
ferring to the accompanying drawings in which:
Fig. 1 is a front elevation of the split parabolic
2,418,558
3
transceiver to the socket III by means of leads
I'I which are housed in the rear portion within
the box transceiver portion of the center section.
As the parabolic antenna reflector unit of this
invention is intended for outdoor use, I prefer to
cover the entire surface of the antenna radiator
IEI and the members I, 3 and il -with a low loss
insulating material such as Amphenol to avoid
arrangements may be made where necessary to
provide electrical contact between sections.
While I have indicated and described a pre
ferred system for carrying my invention into
effect, many modifications may be made without
departing from the scope of my invention.
What I claim is:
l. A parabolic ultra high frequency antenna
system comprising a rectilinear box portion hav
detuning effects due to rain, snow or ice forming
on the antenna itself. A coaxial line is preferred 10 ing one of its surfaces forming a center section,
two side sections insulatingly secured to said
to feed the antenna which is isolated by two quar
ter wavelengths arranged in the usual fashion.
box portion so as to be detached from each side
Referring to Figs. 4 and 5 of the drawings,
of said center section.
.
2. A high frequency reñector comprising a cen
there is shown how the cover and box portions
of the center section are joined for carrying. 15 tral section, a pair of side sections removably
The cover portion 2E! serves for enclosing the side
secured thereto, the entire surface of said central
section and said side sections being covered with
sections and also other control devices such as
a low loss insulating material to avoid detuning
the radiator Iii, head-phones Iii, and plug and
effects due to foreign material coming in contact
cable I5, which devices are located within the
connues of the box cover portion when the box 20 with said reflector.
3. An ultra high frequency antenna system
is closed. The cover portion ZIB is provided with
comprising a parabolic reflector including a recti
a carrying handle 2l and is secured to the box
linear box portion having one of its surfaces
or transceiver portion of the center section by
forming a center section and having two side
means of suitcase clasp members 22 and
The lower portion cf center section i contains
sections insulatingly secured thereto so as to be
a radio frequency device in the form of a trans
detached from each side of said center section,
said box portion being adapted for enclosing a
ceiver which occupies approximately the lower
radio frequency device, a removable cover portion
third portion of the box. Its tuning and volume
cooperating with said box portion for enclosing
control knobs 2d are located on a panel at the
rear of the box. Access to these controls is ac 30 said side sections.
4. An ultra high frequency antenna system
complished by having an aluminum cover plate
comprising a parabolic reflector including a
pivotally secured to the box by means of a
rectilinear box portion having one of its surfaces
Fastened to this cover plate are two
inwardly i'oi
canvas shields 2i which are ar
ranged so that in the operation of the transceiver
the plate ‘i5 and canvas shields 2i in the open
position constitute an effective rain shield. In
Fig. 2 the cover plate and shield are shown in
the closed position with the' open position shown
by dash lines. In Fig. 4 the rain shield is indi
cated in the open position with the control knobs
îië exposed for» operation. To transport the re
iiector the» canvas shields are folded inwardly,
then pressed down and covered by the aluminum
plate 25. At the lower portion of plate 25 there
are two leather straps 28 which are snapped by
means of glove fasteners 2i) to the bcttomof the
box l, as shown in Fig. 5.
In the operation and assembly of this system
the perforation 5A of the wing or end sections
is placed over the stud 5B and then the wing is
swung into operating position so that, the angle
portion of the wing slides beneath the arcuate
strip il until the notches d coincide with the rivets
EB and the thumb screw "1. The thumb screw ‘l
is then tightened and the wing slid into the
position shown inl Figs, 1 and 2 and the entire
rel'iector is then complete. The antenna radiator
iii is plugged in the metallic connection bushing
, forming a center section and having two side
sections secured thereto so as to be detached
from each side of said center section, said center
section being arranged with straight ends to form
a portion of a lbox for enclosing a radio frequency
device, the entire surface of said center section
and said side sections being covered with a low
loss insulating material to avoid detuning effects
due toforeign material coming in Contact with
said reñector, a cover portion cooperating with
said center section for enclosing said side sec
tions, and fastening means secured to the lower
portion of an end of said center section for fasten
ing the reñector to a tripod.
5. An ultra high frequency antenna system
comprising a parabolic reflector including a
rectilinear box portion having one of its surfaces
forming a center section and having two side
sections secured thereto so as to be detached
from each side of said center section, the entire
surface of said center section and said side- sec
tions being ccvered with a low loss insulating
material to avoid detuning effects due to foreign '
material coming in contact with said reñector,
said center section being arranged with straight
ends in the form of a box, a cover portion co
The thumb screw I3 is tightened to secure 60 operating with said center section for enclosing
the center section I to tripod 2. Electrical con
said side sections, a radio frequency device lo,
nection >from the transceiver- to the power supply
IS is made by means of cable and plug being
inserted in socket I4. Theparabolic'antenna
system is then ready for use.
65
cated in said center section, fastening means
secured to the lower portion of an end of said
center section for fastening the reflector to a
tripod~ which is arranged at one end of said cen
ter section, and a socket portion located adja
cent said fastening means for the tripod for elec»
It will be noted that no electrical contactV is
made between the side sections 3 and ¿l and the
center section i. In fact I prefer to deliberately
trically connecting said radio frequency device
insulate the entire surface of the sideA sections
to a source of power.
with low loss4 insulating material for the reason 70
6. A parabolic, ultra high frequency antenna
that I iînd that poor contact generally causes
system comprising a rectilinear box portion hav,.
noise in the receiver when electrical contact is
ing one of its surfaces forming a center section,
made. It is to be understood that the parabolic
two side sections secured to said box portion so
reflector surface may be cut into other shapes
as to be detached from each side of said center
than those shown in Figs. 1 and 2 and diñerent 75 section, the entire surface of said center' section
2,413,558
5
and said side sections being covered with a low
loss insulatingmaterial to avoid detuning effects
due to foreign material coming in contact with
said reflector, an antenna radiator and a radio
frequency device located in the central portion
of said center section.,
7. A parabolic ultra high frequency antenna
system comprising a rectilinear box portion hav
6
cated within the box portion of said center sec
tion, a cover portion cooperating with said center
section for enclosing said side sections when it
is desired to transport said antenna system, fas
tening means secured to the lower portion of said
center section for fastening the reflector to a
l;ripod which is arranged at one end of said cen
ter section and a socket portion located adjacent
thereto for electrically connecting said trans
ing one of its surfaces forming a center section,
to a source of power.
two side sections with angular slotted portions 10 ceiver
9. An ultra high frequency antenna system
arranged to be detached from each side of said
comprising a parabolic reflector including a cen
box portion, the entire surface of said center sec«
ter section having two side sections secured there
tion and said side sections being covered with a
to, said center section being arranged in the form
low loss insulating material to avoid detuning
of a rectilinear box, a radio frequency device
effects due to foreign material coming in contact 15 located in the lower portion of said center vsec
with said reflector, and mechanical engaging
tion, an operating panel maintained at the rear
means secured to said box portion of the center
of said center section, a hinged waterproof
section for the engaging angular slotted portions
cover arranged to be folded over said panel, a
located at the ends of said side sections for fasten
cover portion cooperating with said center sec
20
ing them to the center section.
tion for enclosing said side sections when it is
8. An ultra high~ frequency antenna system
desired to transport said antenna system, fas
comprising a parabolic reflector including a cen
tening means secured to the lower por
ter section having two side sections secured there
tion of said center section for fastening the re
to, the entire surface of said center section and
flector to a tripod which is arranged at one end
said side sections being covered with a low loss 25 of said center section and a socket portion located
insulating material to avoid detuning effects due
to foreign material coming in contact with said
reflector, said center section being arranged in
the form of a rectilinear box, a transceiver 1o
adjacent thereto for electrically connecting said
radio frequency device to a source of power.
DE WITT RUGG GODDARD.
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