Com-Power AH-118 User manual
HORN ANTENNA
1 - 18 GHz
MODEL AH-118
rev: 011806
WARRANTY
All equipment manufactured by Com-Power Corporation is warranted against defects in
material and workmanship for a period of two (2) years from the date of shipment. Com-Power
Corporation will repair or replace any defective item or material if notified within the warranty
period.
You will not be charged for warranty service performed at our factory. You must, however,
prepay inbound shipping costs and have a return authorization.
This warranty does not apply to:
a) products damaged during shipment from your plant or ours.
b) improperly installed products.
c) products operated outside their specifications.
d) improperly maintained products.
e) products which have been modified.
f) normal wear of material.
g) calibration.
Any warranties or guarantees, whether expressed or implied, that are not specified set forth
herein, will not be considered applicable to any equipment sold or otherwise furnished by Com-
Power Corporation. Under no circumstances does Com-Power Corporation recognize or assume
any liability for any loss, damage or expense arising either directly or indirectly from the use or
handling of products manufactured by Com-Power Corporation, or any inability to use them
separately or in combination with other equipment or material.
The warranty is void if items are shipped outside the United States, without prior approval of
Com-Power Corporation.
Warranty Limitations
The above warranty shall not apply to defects resulting from improper or inadequate maintenance
by the buyer, unauthorized modification or misuse, operation exceeding specifications, or im-
proper site preparation.
AH-118 Horn Antenna
The Model AH-118 Horn antenna were designed for use in an EMI laboratory to
measure or generate electric fields.
Test Operator and Test Location:
The Model AH-118 antenna should be operated by trained personnel in the
field of EMC for the purpose of generating electromagnetic fields. Test location
should be selected to avoid interference to other equipment and exposure of
personnel to high electromagnetic fields
Maintenance and Service:
There are no user serviceable parts in the antenna. However, the user should peri-
odically check the antenna for any deformed elements or dents on the antenna
caused by accident during use. Com-Power recommends calibration of antenna at
least once a year. Com-Power provides calibration service for all equipment
sold. Call the factory if calibration or other service is required.
SAFETY PRECAUTIONS
AH-118 Horn Antenna
About this Manual
This manual provides instructions for testing and using the Model
AH-118 Horn Antenna.
Information contained in this manual is the property of Com-Power
Corporation. It is issued with the understanding that none of this
material may be reproduced or copied without written permission
from Com-Power.
If you encounter problems while using the Model AH-118 Horn
Antenna, contact Com-Power Corporation at (714) 528-8800.
If You Need
Assistance
iv
AH-118 Horn Antenna
Contents
v
List of Figures
Section Page
1General Information.................................................................... 1-1
1.1 Introduction ........................................................................................... 1-1
1.2 General Description ............................................................................. 1-1
1.3 Equipment Specifications ................................................................... 1-1
1.4 Equipment, Accessories, and Documents Supplied ...................... 1-2
2Connecting Procedures............................................................. 2-1
2.0 Introduction ........................................................................................... 2-1
2.1 Antenna Setup...................................................................................... 2-1
3Theory of Operation ................................................................... 3-1
3.0 Overview................................................................................................ 3-1
3.1 Theory of Operation ............................................................................ 3-1
1-1 Antenna Factors (typical) .................................................................... 1-3
1-1 Equipment Specifications ................................................................... 1-2
1-2 Power Requirement (typical) .............................................................. 1-2
1-3 Antenna Gain (typical)......................................................................... 1-3
List of Tables
AH-118 Horn Antenna
General Information 1
This section includes the following:
a) Introduction
b) General Description
c) Specifications
d) Equipment Supplied
1-1
1.1 Introduction
This section contains general description of the Horn antenna Model AH-
118. This section also contains general performance and background
information and technical information about the antenna.
1.2 General Description
The Model AH-118 Horn antennna was specifically designed for radiated
EMI measurement over a wide frequency range. The Model AH-118 was
also designed to receive radiated signals or transmit during susceptiblity
testing for various EMC specifications.
The Horn antenna is a broadband transducer which converts Electric field
strength in dBuV/m to Volts that can be displayed on a spectrum analyzer
or EMI meter.
Setting up using the antenna is described in section 2. Information on
theory of operation is given in section 3. Typical physical and operational
characteristic of the Horn antenna are given in appendix 1 and II.
1.3 Equipment Specifications
The specifications for model AH-118 horn antenna are listed in Table 1-1
(see next page 1-2).
AH-118 Horn Antenna
1-2
1.4 Equipment, Accessories, and Documents Supplied
Equipment, accessories, and documents supplied with the model AH-118
horn antenna are as follows:
a) Horn antenna
b) User's guide
c) Calibration information
Frequency Range: 1 - 18 GHz
VSWR (Average) 2.5 : 1.0
Gain, dBi (Typ.) See Table 1-3
Power Handling: 400 Watts CW
Impedance: 50 Ohms
Polarization: Linear
Connector: :Type N (female)
Weight: 4 lbs. max.
Dimensions: 8" L x 9.5" W x 6" H
Mounting: 1/4 - 20 bolt hole
Table 1-1 Equipment Specifications
Table 1-2 - Power requirement (watts) to obtain field strength at 1 meter.
Frequency E-Field strength
GHz 10 V/m 20 V/m 100 V/m
10.62 2.48 62.0
20.82 3.27 81.8
30.41 1.64 40.9
40.20 0.78 19.6
50.24 0.97 24.1
60.17 0.70 17.4
70.22 0.88 22.0
80.24 0.94 23.5
90.16 0.65 16.3
10 0.20 0.80 20.0
12 0.13 0.53 13.2
14 0.28 1.11 27.7
16 0.09 0.35 8.7
18 0.18 0.70 17.5
AH-118 Horn Antenna
0
10
20
30
40
50
60
1 3 5 7 9 11 13 15 17 19
Frequency (GHz)
Frequency Gain
(GHz) (dBi)
17.3
26.1
39.1
412.3
511.4
612.8
711.8
811.5
913.1
10 12.2
12 14
14 10.8
16 15.8
18 12.8
Table 1-3 Typical Antenna Gain
Figure 1-1 Typical Antenna Factors
1-3
AH-118 Horn Antenna
This section explains the following:
a) Introduction
b) Setup
Setup Procedure 2
2-1
2.0 Introduction
This section describes antenna setup and mounting for EMI measurement.
2.1 Antenna Setup
2.1.1 Connecting
The model AH-118 horn antenna has an N type female connector. This connector
is used for signal input or output.
2.1.2 Antenna setup for receiving signals
The Model AH-118 antenna can be used to measure EMI from an equipment
under test (EUT). The antenna is mounted on either an antenna mast (such model
AM-400) or an antenna tripod. The antenna rear has a 1/4 inch x 20 threaded hole
for mounting on AT-100 series tripod or other similar tripod. Acoax cable is
used to connect the antenna to the a measureing instrument. If a long cable is
used, cable loss must be measured and used in calculating the field strength.
2.1.3 Antenna setup for transmitting signals
When AH-118 antenna is used for transmiting signals, the antenna is mounted on
either on an antenna mast (such Model AM-400 antenna mast ) or antenna tripod.
To transmit signals, the antenna is connected to a microwave signal generator and
a power amplifier. The Model AH-118 antenna can transmit upto 400 watts
continious power. The field generated by the antenna can be measured by using
field strength probes or another horn antenna.
AH-118 Horn Antenna
2.1.3 Test location
The Horn Antenna must be mounted and placed in area away from other conduc-
tive objects or materials when in use. Large conductive building, structures and
electrical cables, can reflect and reradiate the emissions of EUT, causing errors in
the test data. In addition, care should be taken to keep measuring intruments and
test personnel away from the test area to avoid interference to the test, as well
exposure of test personnel to high electromagnetic fields.
2-2
AH-118 Horn Antenna
Theory of Operation 3
This chapter explains the following:
a) Overview
b) Theory of Operation
3-1
3.0 Overview
This section describes the theory of operation of the Horn Antenna.
3.1 Theory of Operation
Broadband antennas allow measurement of signals over a wide frequency
range. These antennas do not require any tuning or balun switching during
measurement. It is very useful for sweep measurement over the frequency
range of operation. Models AH-118 Horn Antennas are broadband
antennas that operate in the frequency range of 1 GHz to 18 GHz.
Model AH-118 can both receive and Transmit over the frequency range of
operation and ise used for susceptibility and emissions testing in EMC
Laboratories.
Before the Horn antennas are used for measurement they have to be
calibrated. Typically antenna calibration is performed in an open field test
site( OATS). During calibration a known field strength (dBuV/m) is
generated around the antenna at each frequency (1 GHz - 18 GHz). The
difference between field strength (dBuV) received by the antenna and
known field strength generated ( dBuV) is the antenna factor (dB) for that
frequency. During EMC testing the antenna factor for the frequency of
interest is added back to reading on the EMI meter or spectrum analyzer
to measure field strength.
dBuV/m (field strength) = dBuV (output measured) + Antenna Factor
Table of contents
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