Rev B
1
1. GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The AR RF/Microwave Instrumentation Model ATH18G40 High-Gain Horn Antenna is a complete, self-
contained unit that is well-suited for either shielded room or free-space radiated emissions or radiated
susceptibility testing over a frequency range of 18–40 GHz. The Model ATH18G40 has a power-handling
capability of 450 watts (W) with a minimum gain of 15.2dB at 18 GHz, increasing linearly to more than
21.2dB at 40 GHz.
This versatile antenna works equally well as a radiator for Radio Frequency (RF) susceptibility testing or as a
receiving antenna for RF emissions testing.
1.2 SPECIFICATIONS
Refer to the AR RF/Microwave Instrumentation Data Sheet at the end of this section for detailed
specifications, including Voltage Standing-Wave Ratio (VSWR), for the Model ATH18G40.
1.3 PERFORMANCE DATA
Typical Gain versus Frequency and Calculated Field Strength (1m and 3m) versus Frequency data for the
Model ATH18G40 are included in Section 2 of this manual. Typical Beam Width (E-Plane and H-Plane) data
for the Model ATH18G40 is presented in Table 1-1.
Table 1-1. Model ATH18G40 Typical Beam Width (E-Plane and H-Plane)
Frequency (GHz)
H-Plane -3dB Beam Width
(degrees)
E-Plane -3dB Beam
Width (degrees)
Gain (dBi)
18.00
29
32
15.2
20.2
26
28
16.2
22.4
24
25
17.1
24.5
21
22
17.6
26.8
20
20
18.3
29.0
18
19
19.0
31.2
17
17
19.4
33.4
16
16
19.9
35.6
15
15
20.4
37.8
14
14
20.8
40.0
13
13
21.2
1.4 INSTALLATION
Before installing the antenna, thoroughly inspect the unit for signs of any physical damage that may have
occurred during shipment. Read the following operating instructions in their entirety, and pay particular
attention to all
CAUTION
notes.
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