JED - January 2018 - 26

E1+E2 +E3

H1+H2 +H3

Parallel flight paths
run perpendicular
to the beam

The Journal of Electronic Defense | January 2018

26

Figure 3. Line-abeam configuration for collaborative EW. Properly configured and sequenced, this configuration can act as a superdirective endfire
array with power density gain of N 2 exactly on the beam axis (and only on the beam axis!).

this configuration exactly on boresight is well known as N2. The second
configuration, line abreast, is nothing
more than a linear array with a broadside beam. The directive gain for this
configuration at long range and exactly
on broadside is also well known as 2 N
d / λ where d is the spacing between
the elements and λ is the wavelength
of the RF waves. The magnetic field
vectors of the line abeam array have

the same polarization only along the
boresight. Similarly, the magnetic field
vectors of the line abreast array have
similar (nearly identical) polarization
only along the broadside direction. The
gain of both these configurations drops
off just as soon as you move off boresight or off broadside since the magnetic field vectors no longer have the
same polarization. It goes without saying that the array gain is reduced as

the fields become less well polarized,
and this is exactly what we should expect from an arbitrary configuration
of collaborating jammers. In setting
expectations for collaborative EW, it is
critical to understand that the N2 array
gain for the line-abeam and 2 N d / λ
for the line-abreast configurations are
not general results. These are special
cases, and we should not expect to obtain N2 array gain for an arbitrary con-



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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