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A
DVANCED ELECTROMAGNETICS INC.
9311 S
P. O. BOX 711719, S
FAX: (619) 449-1553 P
TECHNICAL BULLETIN
ADVANCED ELECTROMAGNETICS DIELECTRIC MATERIAL
1.0 INTRODUCTION
Advanced ElectroMagnetics, Inc., has developed a series of dielectric foams
providing a 1ossy medium to microwave energy. The AES Series materials are
ideally suited for electronic enclosures, radar systems and for other component
applications where low levels of RF absorption is desired. The AEPF version of
this material is used in anechoic chambers for treatment to wall to wall, or ceiling to
wall intersections.
This material provides additional lossy foam in areas and is used instead of miter
cut materials. The AES/AEPF materials are highly fire retardant and can be
provided in standard sheet sizes or in custom fabricated shapes. The following
specification describes the properties of the AES Series lossy dielectric slab
materials.
TEVENS ROAD,
ANTEE
, CA. 92072-1719
HONE
: (619) 449-9492
AES/AEPF SERIES
2.0 RELATED DOCUMENTS
1) NRL Flammability Standard 8093 tests 1, 2, & 3.
2) Advanced ElectroMagnetics Quality Manual
3) AEMI Drawing and Planner Number AES/AEPF
4) AEMI Procedures #4 #6 #20 # 24
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AEMI TECHNICAL BULLETIN AES/AEPF SERIES
3.0 MECHANICAL PROPERTIES
3.1 Thickness
The AES Series material can be provided in any thickness up to 4".
Thicker materials are glued with a non-f1ammable adhesive. The tolerances that
can be achieved in cutting are typically plus or minus 1/16". Upon request, closer
tolerances can be achieved with the use of additional tooling.
3.2 Planar Dimensions
The AES Series material is provided in standard 24” x 24” sheets. Larger sheets are
available up to 30” x 48”
3.3 Density
Material density will depend on the 1oading and may vary
from 3 to 5 lb/cu.ft.
3.4 Homogeneity
The properties of the carbon impregnation mix will provide even dielectric
properties throughout the planar area of the absorber. The product will be
smooth and homogeneous in texture throughout it’s bulk.
3.5 Foam characteristics
The base foam has a predominately open cell structure and is a polyurethane foam..
Its basic flammable character is modified by the addition of a number of chemicals
and it passes NRL 8093 tests 1, 2, & 3.
3.6 Material Use
The customer application will define the supply shape. It can be readily cut by
scissors in thin layers and with a small bandsaw or similar when thicker. Small
pieces can be straight forwardly cut using a shape blade.
4.0 ELECTRICAL PROPERTIES
This material exhibits a variable insertion loss when measured at 1.5 GHz using
appropriate antennas. The designation of the carbon loading (active lossy
ingredient) is as denoted with the insertion loss in dB for a 1/2 inch thickness
tabulated. Other thickness values change in direct proportion to thickness.:
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AEMI TECHNICAL BULLETIN AES/AEPF SERIES
DESIG AES-14 AES-20 AES-22 AES-24 AES-26
Insertion
Loss @ 1.5
GHz
1 dB +/-.5 4 dB +/-.5 8 dB +/-1.0 15 dB +/-2.0 20 dB +/-.3.0
The insertion loss remains constant over a range 1 to 8 GHz. Special requirements
for thickness and insertion loss can be provided on request. Similarly, data on
dielectric constant can be provided for specific versions of this material. The
permittivity of the different versions of this material will vary.
5.0 APPLICATION
These materials can be used where a lossy microwave filler material is needed.
6.0 BONDING
AEMI type AES/AEPF can be readily cut to shape and bonded using most types of
contact adhesives.
7.0 BOND STRENGTH AND TENSILE STRENGTH
Measurements have been made bonding with AEMI adhesive AEA-175 and a bond
strength of 8 PSI was found consistent in all samples. The tensile strength of the
foam product is 15 PSI.
8.0 FLAMMABILITY
These materials have several chemical additives to make the product highly flame
retardant. The material will meet the requirement. of NRL 8093 tests 1, 2, & 3 .
9.0 PROPRIETARY NOTICE
The information contained in this is the property of Advanced ElectroMagnetics,
Inc. (AEMI) and is provided for customer use only. Any reproduction or
distribution of this material without the written consent of AEMI is prohibited
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