Aerospace & Defense Technology - December 2021 - 13

Test & Measurement
Account for Expansion of Frequency
Ranges with Electromagnetic Testing
As noted at the outset, the range of frequencies
at which aerospace and defense
electronics must operate has expanded
and continues to expand, making EMI
shielding more complex. From high-frequency
5G communications to low frequency
radar signals to data transfer in
the standard 2-18 GHz communications
band, the industry needs to creatively
model and implement EMI-mitigating
solutions that operate with precision at
specific frequency ranges. Then, engineers
must validate the shielding effectiveness
of those solutions.
MIL-STD-461E is the U.S. military
standard that governs EMI testing and
electromagnetic compatibility for military
products. To meet the requirements
set out by this standard, design engineers
can use a variety of shielding solutions -
from board-level shields to microwave
absorbers to conductive elastomers - and
deploy them creatively across electronic
equipment that produces signal noise.
Engineers should use electromagnetic
modeling and simulation to determine
which solutions will best address the application's
EMI challenges. Using 3D
electromagnetic simulation programs,
such as HFSS and Microwave CST, engineers
can compare different solutions
and devise an optimal layout for their
EMI materials. Then, test the shielding
effectiveness of these EMI materials
using techniques such as transfer impedance
testing and insertion-loss testing.
As aerospace and defense design engineers
work to manage increasingly complex
signal interference challenges across
a wider range of frequencies, they must
leverage all the tools available today to
model and test EMI solutions to ensure
electronics meet the U.S. military's strict
requirements and operate effectively.
Deploy a Full Arsenal of Test
Capabilities to Enable Advanced
Electronics
With electronics getting smaller and
more powerful while frequency ranges
broaden, the aerospace and defense industry
must account for more variables than
ever before when testing the EMI materials
that play a crucial role in the operability of
battlefield electronics. It's important to
Aerospace & Defense Technology, December 2021
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take a holistic and predictive approach to
testing. Leverage the wide array of advanced
tools available today to successfully
test EMI materials and enable the
electronics that play a crucial role in ensuring
fast and accurate communications in
rugged environments across the globe.
This article was written by Rick Johnson,
Aerospace and Defense Director; and
Daniel Ramirez, Field Application and
Technical Support Engineer, Laird R&F
Products, a DuPont business (Carlsbad,
CA). For more information, visit http://
info.hotims.com/79420-501.
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Aerospace & Defense Technology - December 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - December 2021

Aerospace & Defense Technology - December 2021 - Intro
Aerospace & Defense Technology - December 2021 - Sponsor
Aerospace & Defense Technology - December 2021 - Cov1
Aerospace & Defense Technology - December 2021 - Cov2
Aerospace & Defense Technology - December 2021 - 1
Aerospace & Defense Technology - December 2021 - 2
Aerospace & Defense Technology - December 2021 - 3
Aerospace & Defense Technology - December 2021 - 4
Aerospace & Defense Technology - December 2021 - 5
Aerospace & Defense Technology - December 2021 - 6
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Aerospace & Defense Technology - December 2021 - 11
Aerospace & Defense Technology - December 2021 - 12
Aerospace & Defense Technology - December 2021 - 13
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Aerospace & Defense Technology - December 2021 - 40
Aerospace & Defense Technology - December 2021 - Cov3
Aerospace & Defense Technology - December 2021 - Cov4
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