Aerospace & Defense Technology - October 2022 - 28

RF & Microwave Technology
Solving Signal Interference Challenges in Aerospace and Defense Electronics
A
s the complexity of signal challenges
in aerospace and defense technology
increases, design engineers need to
creatively combine materials to solve
multiple problems at once. Comolding,
which involves combining two uncured
elastomers with different electrical properties
into one homogeneous material or
molding elastomers with metal, fabric or
composite structures, is an innovative
way to address these challenges.
There are many ways to use comolding
in aerospace and defense applications.
For example:
* Comolding of elastomeric absorbers to
conductive elastomers.
* Molding low dielectric or conductive
layers to an absorber or to an absorbing
layer.
* Molding nonconductive layers to conductive
layers.
* Molding conductive elastomers directly
to metal housings or shielding.
* Cocuring absorbing elastomers within
prepreg composite structures.
* Calendaring elastomers for molding
with conductive or abrasion resistant
fabrics.
To illustrate how comolding can help
design engineers cut down on signal
28
Comolded dual blade seal gasket combining absorber, conductive elastomer and wear-resistant fabric.
(Courtesy Laird R&F Products)
interference and improve signal integrity
in aerospace and defense electronics,
here are some examples from our work
in the industry:
1. Filling a shifting gap: In this instance,
we needed to create a ground plane to
improve the performance of a flexible
elastomeric absorber. Reflections off a
conductive surface create a reflected
wave and a surface wave. To optimize
absorber performance, it's important
mobilityengineeringtech.com
to put in place a conductive substrate
under the absorber to set up the surface
wave, which can then be attenuated
by the absorber. Without this conductive
substrate, energy will flow
through the absorber and create interference.
There are several ways to
achieve this result (from embedding
mesh to bonding conductive metal foil
onto the back of an absorber). However,
a complicating factor in this situaAerospace
& Defense Technology, October 2022

http://www.mobilityengineeringtech.com

Aerospace & Defense Technology - October 2022

Table of Contents for the Digital Edition of Aerospace & Defense Technology - October 2022

Aerospace & Defense Technology - October 2022 - Intro
Aerospace & Defense Technology - October 2022 - Sponsor
Aerospace & Defense Technology - October 2022 - Cov1
Aerospace & Defense Technology - October 2022 - Cov2
Aerospace & Defense Technology - October 2022 - 1
Aerospace & Defense Technology - October 2022 - 2
Aerospace & Defense Technology - October 2022 - 3
Aerospace & Defense Technology - October 2022 - 4
Aerospace & Defense Technology - October 2022 - 5
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Aerospace & Defense Technology - October 2022 - 48
Aerospace & Defense Technology - October 2022 - Cov3
Aerospace & Defense Technology - October 2022 - Cov4
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https://www.nxtbook.com/smg/techbriefs/22ADT12
https://www.nxtbook.com/smg/techbriefs/22ADT10
https://www.nxtbook.com/smg/techbriefs/22ADT09
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https://www.nxtbook.com/smg/techbriefs/22ADT06
https://www.nxtbook.com/smg/techbriefs/22ADT05
https://www.nxtbook.com/smg/techbriefs/22ADT04
https://www.nxtbook.com/smg/techbriefs/22ADT02
https://www.nxtbook.com/smg/techbriefs/21ADT12
https://www.nxtbook.com/smg/techbriefs/21ADT10
https://www.nxtbook.com/smg/techbriefs/21ADT09
https://www.nxtbook.com/smg/techbriefs/21ADT08
https://www.nxtbook.com/smg/techbriefs/21ADT06
https://www.nxtbook.com/smg/techbriefs/21ADT05
https://www.nxtbook.com/smg/techbriefs/21ADT04
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