Atec Com-Power-AH640 - Manual

A-19
Horn Antenna
Features
Broadband - 26.5 GHz to 40 GHz
High Gain - Lower Floor Noise for Emissions
Individual Calibration
Two Year Warranty
AH-640
Description
Model AH-640 is a broadband linearly polarized
double ridged waveguide horn antenna designed
specifically for Electromagnetic Interference
testing. This antenna can be used for receive as
well as transmit applications for the frequency
range of 26.5 GHz - 40 GHz.
This antenna has a high gain; at least 23 dBi over
the entire frequency range. This antenna can
accept up to 5 Watts of input power at its termi-
nals in continuous mode in the applicable fre-
quency range for generating electromagnetic
fields.
The AH-640 Horn antenna has a K type connec-
tor which can mate with SMA type connectors.
The antenna is constructed using lightweight
aluminum with a corrosion resistant finish. The
oval rear plate has a 1/4" x 20 threaded hole for
mounting to the Com-Power AT-100 tripod.
The antenna is individually calibrated at 1 meter
and data and certificate of calibration will be
shipped with the antenna. The data will include
the antenna factor and antenna gain.
Application
The AH-640 was designed for EMC testing, but
it can also be used for antenna gain pattern
measurements, surveillance, and other applica-
tions. The wide frequency band makes the AH-
640 antenna suitable for sweep measurements,
reducing the need for antenna switching during
the test.
High gain reduces input power requirements to
achieve the desired field levels for immunity
testing and improves antenna sensitivity to low
level signals. During emissions testing the mea-
sured field strength can be calculated by adding
the antenna factor for the particular frequency to
voltage measured at the antenna output terminal.
For immunity testing, the input power require-
ment P in Watts to generate E electric field
strength in V/m at a distance D in meters can be
calculated by using the following formula:
P = E 2 x D 2 / 30 x N
N = 10 (G/10)
G = 20 log F -29.79- AF
Where
N = Numeric Gain
G = gain in dBi
F = Frequency in MHz
AF = antenna factor in dB/m