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Патент USA US2115789

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May 3, 1938.
Filed May 22, 1936
Patented May 3, 1938
Kurt Schmid, Berlin, Germany, assignor to Tele
funken Gesellschaft fiir Drahtlose Telegraphie
m.‘ b. 11., Berlin, Germany, a corporation of
Application May 22, 1936, Serial No. 81,181
In Germany June 4, 1935
(Cl. 250—11)
2 Claims.
The present invention is concerned with a
weatherproof arrangement for ultra short waves.
much as it is suitable in the case of parabolic
re?ectors to mount in front of the dipoles a small
In the mounting of antennae it happens quite
often that their proper operation is seriously im
5 paired by the inclemencies of the weather, bird
auxiliary re?ector, the part H of tube J accord
ing to this invention may be made of metal or
else is metallized inside and out.
The embodiments here described embodying the
idea of this invention offer the advantage that
with limited means the radiators are safeguarded
excrements and dead insects. It has been sug~
gested to accommodate the entire antenna as
sembly, that is to say, radiator, including re
?ector or tube, inside a box casing permeable to
10 electrical waves. Although the antenna assembly
is safeguarded from the e?ects of the weather,
one shortcoming of this idea is that the large sur
faces of the box offer a high resistance to the wind.
from atmospheric agencies and from soiling by
animals, while yet causing but little wind resist 10
It will be evident that the basic idea of the
invention is not con?ned to the instances here
Another disadvantage is that the expenditure for
discussed. For instance, also individual dipoles
15 material is so great that it does not warrant the
and rows of dipoles of a “Christmas tree” type of
directional antenna could be placed inside a tube
According to the present invention, only th
radiator or radiators are accommodated inside a
casing protecting the same against atmospheric
20 agencies, and that the re?ector is built according
to aerodynamic principles.
An exempli?ed embodiment of the basic idea
of the invention is illustrated in Fig. 1. Fig. 2
shows a detail of Fig. 1.
Referring to Fig. l, in the focal line of the cyl
inder paraboloid P is a tube R. which is closed
all around and made of insulation material, there
being con?ned in the interior of the said tube a
dipole radiator D. The feed line S passed through
30 the re?ector- is con?ned inside the metallic pipe
M for the sake of shielding. In such cases, Where
metallic shielding is not absolutely necessary, the
feeder S could be shielded also by lighter and
cheaper material. Now, in order to minimize the
35 wind resistance of the parabolic mirror, the same
is not made from sheet metal, but rather from a
gauze or wires extending parallel to the dipoles.
The way the pipe or tube enclosing the dipoles
D should preferably be made is illustrated in Fig.
40 2. For the sake of simplicity, only one pair of di
poles D is here illustrated which is directly united
with the feeder S. The feeder for the purpose of
shielding it is laid inside the metallic tube M
which at point 0 is passed through the re?ector
45 (not shown). The pair of dipoles D is placed in
the tube J made of insulation material, which at
both ends is shut by lids V though the same is
shown cut open at the bottom end. Now, inas~
to be safeguarded from the weather or some
similar enclosure or container and the posterior
re?ector could be built up of a number of parallel
wires. It will be understood that the invention 20
could be applied also to antenna arrays compris
ing rotary paraboloids, etc.
What is claimed is:
1. In combination, a re?ector, a dipole antenna
at the focus of said re?ector, said dipole having
two arms arranged substantially in the same
straight line, a feed line connecting the adjacent
ends of said arms with high frequency apparatus,
a hollow insulating tube completely surrounding
said antenna and having an aperture located in
the center thereof for entrance of said feed line,
and a metallic shield surrounding said feed line
for at least a portion of its length adjacent said
insulating tube.
2. In combination, a reflector comprised of per
forate metallic material, an antenna at the focus
of said reflector, a feed line connecting said an
tenna with high frequency apparatus, a hollow
insulating tube completely surrounding said an
tenna, and a metallic shield surrounding said cs
feed line for at least a portion of its length, that
portion of said insulating tube farthest removed
from the center of said re?ector having a metal
surface for re?ecting towards said re?ector rays
emanating from said antenna and striking said
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