Atec AT4640, ATH18G27-1 User Manual

Model ATH18G27-1

Antenna

18GHz–26.5GHz

The Model ATH18G27-1 is a wide band, low gain, wide beamwidth, high power microwave horn antenna.
With a minimum gain of 8.8dB over isotropic, the Model ATH18G27-1 supplies the high intensity fields
necessary for RFI/EMI field testing within and beyond the confines of a shielded room. The Model ATH18G27­1 is extremely compact and light weight for ready mobility, yet is built tough enough for the extra demands of
outdoor use and easily mounts on a rigid waveguide by the waveguide flange. Part of a family of microwave
frequency antennas, the Model ATH18G27-1 provides the 18.0-26.5GHz response required for many often
used test specifications.

The ATH18G27-1 is ideally suited for use with the AR Models 40T18G26 and other high power amplifiers in
this frequency range.

FREQUENCY RANGE .................................................... 18.0-26.5GHz

POWER INPUT (maximum) ............................................ 350 watts CW

POWER GAIN (over isotropic) ........................................ See Curve

VSWR

Maximum .............................................................. 1.5:1

Average ................................................................. 1.3:1

BEAM WIDTH (average)................................................. See Curve

CONNECTOR .............................................................. WR-42 waveguide

MOUNTING PROVISIONS ............................................. Waveguide flange

WEIGHT (maximum) ..................................................... 57 g. (2 oz.)

SIZE (WxHxD) ................................................................ 1.63 x 1.32 x 2.92 cm, (0.64 x 0.52 x 1.15 in)

SPECIFICATIONS

061209

160 School House Road Souderton, PA 18964-9990 • 215-723-8181 • www.ar-worldwide.com Page 1 of 2

ATH18G27-1 GAIN & 3dB BEAMWIDTH VS FREQ

12

65

11.5

11

10.5

10

GAIN(dBi)

9.5

9

8.5
18 20 22 24 26 28

FREQUENCY (GHz)

H Plane Beamwidth E Plane Beamwidth Gain

E

H

60

55

50

45

40

BEAM WIDTH (DEGREES)

35

30

Field strengths have been measured in free-space conditions. Individual shielded rooms, amplifiers, and test-system conditions will

influence performance. Field strength also varies with frequency and position of antenna and EUT in non-anechoic testing environments.

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