ETS-Lindgren 3142B BiConiLog Antenna (Archived) - Manual (Page 13)

MODEL 3142B BICONILOG™ ANTENNA Application With The Optional T Bow-Tie End Plates
APPLICATION WITH THE OPTIONAL
T BOW-TIE END PLATES
For emissions testing it is recommended that the Model
3142B be used without the optional end plates. The
coupling of the endplates to ground will create higher
uncertainty values, particularly in the vertical polarization.
For more information about this issue see the article “Understanding
the measurement uncertainties of the bicon/log hybrid antenna” by
Zhong Chen in the 1999 issue of Item The International Journal of
EMC.
For immunity testing, the electric field strength generated
at a distance d can be approximated by the formula
( )
E
Pg
d
V / m =
30
where d is in meters, g is the numeric gain (10 G[dB]/10 , see
attached calibration data) and P is antenna net input in
watts. An estimate of the power required for any field
strength E can be obtained from Figure 3 or 4 in the
Typical Data section below, which shows power required
in watts to generate 1 V/m. For any other field strength not
show, multiply the power in watts by the desired E-field
squared, or
( ) ( )
P E E P
V / m V / m = 2 1
Actual transmitted field strength should be verified using
an ETS-Lindgren electric field probe or equivalent. For
IEC 1000-4-3 type testing, the antenna tip cam be placed at
any distance between 1 and 3 m from the EUT as long as
the front face plane is illuminated according to the –0,+6
© EMC TEST SYSTEMS, L.P. – MARCH 2002
9
REV C – PN 399229
Archived 09/23/10