Com-Power AH-640 User Manual

Features

Broadband - 26.5 GHz to 40 GHz

High Gain - Lower Floor Noise for Emissions

Individual Calibration

Two Year Warranty

Horn Antenna

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 termi­nals in continuous mode in the applicable fre­quency range for generating electromagnetic
fields.

The AH-640 Horn antenna has a K type connec­tor 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.

Application

The AH-640 was designed for EMC testing, but
it can also be used for antenna gain pattern
measurements, surveillance, and other applica­tions. The wide frequency band makes the AH­640 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 mea­sured 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 require­ment 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:

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.

Com-Power Corporation (714) 528 - 8800 www. com-power.com [e-mail]

P = E2 x D2 / 30 x N
N = 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

(G/10)

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Specifications

Frequency Range: 26.5 GHz - 40 GHz
Power handling: 5 Watts CW
VSWR: 2.0 :1.0
Polarization: Linear
Connector type: K type (will mate with SMA)
Impedance: 50 Ohms
Weight: 1.5 lbs. (0.68 kg) max.
Size (L x W x H): 8.7 x 5.7 x 9 inches max.

22 x 14.5 x 22.8 cm max.

Typical Antenna Factors:

50

SideView

9.0"

45
40
35
30

Frequency (dB/m)

25
20

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Frequency (GHz)

Mounting Plate

2.27"

Top View

8.7"

2.91"

5.7"

Field strength (dBV/m) = Output measured (dBV) + Antenna Factor (dB/m)

Typical Antenna Gain & Power requirement inWatts at a one meter dis­tance to obtain field strength in V/m:

F

req. Gain Freq. Field Strength

Ghz (dBi) GHz V/m V/m V/m

10 20 100

26 23.41 26 0.02 0.06 1.52
27 24.24 27 0.01 0.05 1.26
28 23.25 28 0.02 0.06 1.58
29 23.26 29 0.02 0.06 1.57
30 23.95 30 0.01 0.05 1.34
31 24.44 31 0.01 0.05 1.20
32 24.11 32 0.01 0.05 1.29
33 24.28 33 0.01 0.05 1.24
34 24.44 34 0.01 0.05 1.20
35 24.99 35 0.01 0.04 1.06
36 25.64 36 0.01 0.04 0.91
37 24.57 37 0.01 0.05 1.16
38 24.01 38 0.01 0.05 1.33
39 24.53 39 0.01 0.05 1.17
40 25.55 40 0.01 0.04 0.93

All values are typical values unless specified.
All specifactions are subject to change without notice.

Com-Power Corporation 114 Olinda Drive, Brea, California 92823 (714) 528 - 8800 www.com-power.com Rev 0102

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