RD 107, TASK ORDER 3, MEETING HELD (SANITIZED) 1 MAY 57

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000500020001-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: February 15, 2012
• Sequence Number: 1
• Publication Date: May 10, 1957
• Content Type: MEMO

R
Declassified in Part - Sanitized Copy Approved for Release 2012/02/15: CIA-RDP78-03424A000500020001-5
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SUBJECT: i 107, Task Order 3)
DOB '2. .- REV DATE 1950 BY U (~ 7.~ Y u
ORIG COMP . UPI TYPE
ORIG CLASS PAGES ____ REV CLASS C_'
JUST __~^- NEXT REV AUTHO 11* 114
discuss the subject contract. Present at the meting were:
2. This Task Order was completed on 30 April and the final
report has been written. This study was directed at determining
the value of ferrite antennas whose length is short compared to
a wave length at frequencies above 1 mc. This study has produced
the: following conclusions:
a.. There are no ferritea available at this time which
are suitable for frequencies above 30 mc.
b. The diameter of a loop antenna can be reduced
without a loss in gain gar sensitivity by adding a ferrite
core, but the required length of ferrite rod will be
greater than the diameter of the original loop.
c. If the maximum dimensions of the two antennas
are made equal, the gain of the air core loop will be
greater than that gain of the ferrite loop.
d. Ferrite core loop antennas should be used in
applications where a compact package is required.
More convenient packaging is the principle advantage
provided by the ferrite antennas.
e. No evidence was found to indicate that a loop
antenna would be less susceptible to electrostatic inter-
ference or proximity effects than a straight wire antenna
(except for the directional pattern of both Ferrite and
air core loop antennas.) There is no advantages in using
loop configurations for antennas
%W&WW_
CONFIDENTIAL
UNITED STATES GOVERNMENT
DATE: 10 May 155 7
Declassified in Part - Sanitized Copy Approved for Release 2012/02/15: CIA-RDP78-03424A000500020001-5
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/15: CIA-RDP78-03424A000500020001-5
3. These conclusions are equally valid for transmitting
antennas. Moreover, the ferrite core would tend to heat under
thelhigh antenna currents in transmitting antennas. Thus for
transmitting or receiving,
a wire 6 inches long a a -- a or an air core loop 6 inches in
diameter will be a better antenna than a loop wound do a ferrite
core 6 inches long.
4. It was suggested that) (could perform
a service to the electronic field if they would present these
conclusions in a paper since these conclusions are contrary to
the general belief. The project engineer believes he will write
such a paper and has agreed to submit it to this Agency for
approval before submission to any journal.
Declassified in Part - Sanitized Copy Approved for Release 2012/02/15: CIA-RDP78-03424A000500020001-5