ISSN 0010-9525, Cosmic Research, 2018, Vol. 56, No. 3, pp. 251–254. © Pleiades Publishing, Ltd., 2018.
Original Russian Text © S.B. Bibikov, V.U. Kirillov, E.I. Kulikovski, M.M. Tomilin, 2018, published in Kosmicheskie Issledovaniya, 2018, Vol. 56, No. 3, pp. 266–269.
Flexible Material for Protecting Onboard Equipment in Spacecraft
S. B. Bibikov
, V. U. Kirillov
*, E. I. Kulikovski
, and M. M. Tomilin
Emanuel Institute for Biochemical Physics, Russian Academy of Sciences, Moscow, 119334 Russia
Moscow Aviation Institute, Moscow, 125993 Russia
NPP Radiostrim, Moscow, 125080 Russia
Received January 20, 2017
Flexible metallized materials with high shielding
efficiency, low mass, and resistance to space condi-
tions (contrast temperatures and radiation electrifica-
tion) can be used to protect elements and instruments
in onboard equipment and onboard cable network of
spacecraft (SC) from electromagnetic fields .
Flexible metallized materials have good shielding
properties and low specific gravity. Their flexibility
makes it easy to impart the desired shape to them, both
inside and outside the structures of the elements and
instruments of the SC onboard equipment.
In a number of papers, the shielding properties of
different grades of flexible metallized materials have
been studied. For example, the results of a study of the
shielding efficiency of flexible metallized materials of
different grades are given in [2, 3]. Studies have shown
that Metakron flexible metallized material have high
shielding efficiency and can effectively protect onboard
equipment and SC cables from radiation electrification.
The disadvantage of the Metakron material is low tem-
perature stability, since it is made based on a polymeric
material called polyethylphthalate, which has a glass
transition temperature of t ~70°C and, therefore, is not
suitable for shielding elements and instruments of
onboard equipment and onboard cables of open SCs.
On board SCs, it is necessary to use flexible metal-
lized materials based on silica cloth, which keeps their
properties in the temperature range of –150 to +150°C.
TET-0.85 K71-N10 f lexible metallized material
based on silica cloth with a nickel metallization thick-
ness of 10 μm and a thermal degradation temperature
of no less than 1100°C was studied in order to deter-
mine the shielding properties of these materials.
The aim of the study with the shielding capacity of
the material was to determine the electromagnetic
field transmission coefficient K
in the frequency
range of 0.3 MHz–8 GHz in the coaxial transmission
line, which ensures the propagation of the TEM
mode, which is equivalent to the radiation conditions
in the far zone of free space.
A computer-controlled vector network analyzer
Obzor-804/1 was used as a measuring instrument. A
sample of the material cut out in the form of a coaxial
bead was placed in a specially designed measuring cell,
which provides the electrical contact of the sample
simultaneously with the outer and inner conductors of
the measuring linealong the entire perimeter. Before
the measurements, a full two-port through-open-
short-match (TOSM) calibration was carried out by
measuring the cell without a sample, which made it
possible to avoid a significant effect of parasitic signals
re-reflected from the sample while maintaining a high
dynamic range of measurements over the entire fre-
quency band. The reliability of measurements of the
amplitude of the attenuated signal was tested by acti-
vating a set of fixed attenuators in the appropriate
range of frequencies (20, 50 dB).
During the experiments, the electromagnetic field
transmission coefficient K
calculated by the electric
field strength was deter-
mined, where E
is the electric field strength before the
sample, and E
is the electric field strength after pass-
ing through the sample.
Frequency diagrams of the electromagnetic field
transmission coefficient (K
) through material sam-
ples determined in the coaxial transmission line in the
range 0.3 MHz–8 GHz for the TET-0.85 K71-N10
sample are given in Figs. 1a and 1b in natural and log-
arithmic scales, respectively.
The results of a study of TET-0.85 K71-N10 flexi-
ble metallized material show that this material has a
shielding efficiency of S
in a specified fre-
quency range of In addition to pro-
tection from electromagnetic fields, this material can
also be used to protect elements and instruments of SC
onboard equipment from surface radiation electrifica-
tion, which arises from the accumulation of electro-
static discharges under the action of magnetospheric
cosmic plasma .
tr 1 0
20 log [dB],KEE
(58 60) dB.S