Atec AH640 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.

P = E 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

x D2 / 30 x N

(G/10)

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Specifications

ValueTronics International, Inc. - www.valuetronics.com - 1.800.552.8258 or 1.847.468.8258

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:

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:

Freq. 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.

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