JED - January 2018 - 27

E T = E 1 +E2 +E3

HT < H1+H2+H3

E2
H1

E3
H2

H3

Parallel flight paths run
perpendicular
to the target

27

Figure 4. Line-abreast configuration for collaborative EW. Properly configured and sequenced, this configuration can act as a linear array with power
density gain of 2 N d / λ exactly on broadside (and lesser power density gain further from broadside).

figuration. We will look more closely at
this in a future installment.

POINTS TO REMEMBER FOR
"BACK OF THE ENVELOPE"
What do we need to remember when
making "back of the envelope" calculations for collaborative EW? Here are the
important points:
1) Conservation of energy is absolute.
If a result violates conservation of

The Journal of Electronic Defense | January 2018

E1

energy, go back and check the work,
including any assumptions.
2a) The uniform plane wave is a simple
special case that is useful for teaching but fails to take into account
conservation of energy. It is not a
general result and should be used
with caution.
2b) The uniform plane wave proportionality of power flow density and
power to the square of the electric

field is a special case result and
cannot be applied to a generalized
EM field.
3) General EM power flow requires
proper calculation of both the electric and magnetic fields, and then
finding the EM power flow density
from the vector cross product. And
no, the math is not easy, but you really don't have a choice if you want
to get it right.



JED - January 2018

Table of Contents for the Digital Edition of JED - January 2018

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
Thinking Through Collaborative Electronic Warfare
Report from the 6th Annual AOC Pacific Conference
EW 101
AOC News
Highlights from the AOC 54th Annual International Symposium & Convention
Index of Advertisers
JED Quick Look
JED - January 2018 - Intro
JED - January 2018 - cover1
JED - January 2018 - cover2
JED - January 2018 - 3
JED - January 2018 - 4
JED - January 2018 - 5
JED - January 2018 - The View From Here
JED - January 2018 - insert1
JED - January 2018 - insert2
JED - January 2018 - 7
JED - January 2018 - Conferences Calendar
JED - January 2018 - 9
JED - January 2018 - Courses Calendar
JED - January 2018 - 11
JED - January 2018 - From the President
JED - January 2018 - 13
JED - January 2018 - 14
JED - January 2018 - The Monitor
JED - January 2018 - 16
JED - January 2018 - 17
JED - January 2018 - 18
JED - January 2018 - 19
JED - January 2018 - Washington Report
JED - January 2018 - World Report
JED - January 2018 - Thinking Through Collaborative Electronic Warfare
JED - January 2018 - 23
JED - January 2018 - 24
JED - January 2018 - 25
JED - January 2018 - 26
JED - January 2018 - 27
JED - January 2018 - 28
JED - January 2018 - Report from the 6th Annual AOC Pacific Conference
JED - January 2018 - 30
JED - January 2018 - EW 101
JED - January 2018 - 32
JED - January 2018 - AOC News
JED - January 2018 - Highlights from the AOC 54th Annual International Symposium & Convention
JED - January 2018 - 35
JED - January 2018 - 36
JED - January 2018 - Index of Advertisers
JED - January 2018 - JED Quick Look
JED - January 2018 - cover3
JED - January 2018 - cover4
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