Com-Power AH-118 User Manual

Features

Broadband - For sweep measurements

High Gain - Lower Floor Noise for Emissions

Two year warranty

Individual calibration

Horn Antenna

AH-118

Description

The Horn antenna Model AH-118 is a standard
broadband double ridged waveguide horn antenna.
This antenna is linearly polorized and is designed
specifi cally for EMC measurements for the 1-18 GHz
frequency range.

The AH-118 Horn antenna can be used for emissions
and immunity testing. The gain of this Horn antenna is
at least 6.1 dBi over the entire frequency range. Model
AH-118 can accept up to 300 Watts input power in
continuous mode.

This antenna is constructed using light weight alumi­num with a corrosion resistant conductive coating.
The mounting base of Model AH-118 has 1/4 inch x
20 threads. This allows the antenna to be mounted on
a tripod (Model AT-100) or a tripod with matching
threads.

Each antenna is individually calibrated at 3 meters.
The calibration data and certifi cate will be shipped
with each antenna.

Application

This antenna is suitable for ANSI 63.4, CISPR16, EN
55022, FAA and other EMC standards that require
emissions and immunity testing.

The high gain reduces input power requirements to
generate high electromagnetic fi eld levels for immunity
testing. High gain also increases antenna sensitivity
to low level signals.

During emissions measurement, the fi eld strength
(dBV/m) is calculated by adding the antenna factor
(dB/m) to the voltage measured (dBV) at the antenna
terminals.

For immunity testing, the input power requirement P
in Watts to generate E Electric Field Strength in V/m
at a distance in D meters can be calculated by using

the following formula:

P = E2 x D2 / 30 x Numeric Gain
G = 20 log F -29.79- AF
G = 10 log (Numeric Gain)

Where

G= gain in dBi
F = Frequency in MHz
AF = antenna factor in dB

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

Specifi cations

Input Power: 300 Watts continious
VSWR: 2.0 : 1
Polorization: Linear
Impedance: 50 Ω
Connector type: N Female
Weight: 4 lb. max.
Size: 7.8" X 9.5" X 5.6" max.

Frequency Range: 1 GHz - 18 GHz

Typical Antenna Factors:

Tripod
Mounting
Block

Top V iew

Type N
Connector

Front View

7.8"

9.5"

5.6"

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

Typical Antenna Gain and Power Requirement at 1 meter antenna spacing:

Freq. Gain Power requirement (Watts)
GHz dBi 10V/m 20 V/m 100 V/m

1 6.4 0.8 3.0 76.2
2 5.3 1.0 3.9 97.7
3 7.2 0.6 2.6 64.2
4 8.9 0.4 1.7 43.4
5 9.1 0.4 1.6 41.1
6 10.4 0.3 1.2 30.6
7 9.7 0.4 1.4 35.6
8 9.8 0.4 1.4 35.1
9 11.1 0.3 1.0 25.9
10 10.7 0.3 1.1 28.3
12 12.5 0.2 0.8 18.8
14 11.9 0.2 0.9 21.4
16 11.5 0.2 0.9 23.6
18 9.2 0.4 1.6 39.9

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

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