Antennas Log Periodic Dipole Array Antenna - Maxtech · PDF fileThe LPDA antenna is at 1.8 m...

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Information presented is subject to change as product enhancements are made. Contact ETS Sales Department for current specifications.Information presented is subject to change as product enhancements are made. Contact ETS Sales Department for current specifications.Information presented is subject to change as product enhancements are made. Contact ETS Sales Department for current specifications.Information presented is subject to change as product enhancements are made. Contact ETS Sales Department for current specifications.Information presented is subject to change as product enhancements are made. Contact ETS Sales Department for current specifications. 10/99 - 50 G © 1999 ETS-EMCO REV A10/99 - 50 G © 1999 ETS-EMCO REV A10/99 - 50 G © 1999 ETS-EMCO REV A10/99 - 50 G © 1999 ETS-EMCO REV A10/99 - 50 G © 1999 ETS-EMCO REV A

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ONLINE:[email protected]://www.emctest.com

Log PeriodicAntennas

Model 3144G Dipole Array Antenna

ETS-EMCO’s Model 3144G is a broadband,linearly-polarized log periodic dipolearray antenna (LPDA) with a 100 MHz to1 GHz frequency range. The antenna hasmoderate gain to provide an idealillumination area. It exhibits low VSWR ofless than 2:1, which minimizes mismatchlosses between the amplifier and antenna.The Model 3144G handles high powerrequirements of up to 2 kW for generatinghigh electric field strength.

The 3144G is constructed of lightweight,corrosion-resistant aluminum, providingyears of trouble-free service. It receives atough powder coat finish, which protectsagainst scratching and abrasion betterthan painted or bare surfaces.

An optional wheeled pedestal is availablewhich permits horizontal and verticalantenna polarization, height, and tilt-angle adjustments. A pneumatic cylinderis used to change polarization, and can beremotely controlled using an optionalETS-EMCO Model 2090 Controller or anETS-EMCO 2190 Virtual Controller. TheModel 2090 is IEEE-488 compatible, and

Featuresl 100 MHz to 1 GHz frequency range

l Moderate gain for maximumillumination area

l Low VSWR of less than 2:1 minimizesmismatch losses between amplifierand antenna

l 2 kW continuous RF input power(Maximum)

l Tough powder coat finish

uses fiber optic I/O for communicationwith the pedestal. The Model 2190 is PCresident software, and also uses fiberoptic I/O for communication. (Seeseparate product data sheets for addi-tional details.)

Electrical Field Distribution*

The Model 3144G can be used in bothhorizontal and vertical polarizations.The antenna provides a half-powerbeamwidth greater than 50° across thewhole operating frequency range. Thefinal design is thoroughly optimizednumerically and experimentally forefficient radiation and illumination of alarge uniform area.

In the graphs that follow, a full numericalmodel is used to analyze the Model3144G, and no assumption was madeabout the input impedance and radiationpattern of the LPDA antenna. The LPDAantenna design, combined with the setupof the antenna with respect to theequipment under test(EUT), is speciallyoptimized to yield the best uniformity and

field strength in a large uniform area, such as5(w) x 2.4(h) m2 . The input power to theantenna is 1.8 kW (maximum RF output fromthe amplifier provided).

The LPDA antenna is at 1.8 m height from theground and is tilted to boresight to a 1 mheight point on the targeted uniform fieldplane. Field measurement is based on 100 V/mbeing the strongest field point in the uniformarea with the given input power.

For both horizontal and vertical polarizations,100 V/m with 0 dB to -3 dB uniformity can beachieved up to 500 MHz across the whole5 x 2.4m2 area. Above 500 MHz,

l For vertical polarization, from 500 MHz -1 GHz, field uniformity (0 dB to -3 dB) can beachieved in the horizontal direction. In thevertical direction, field uniformity isachieved 0.6 m above the floor in a5 (w) x 1.9(h) m2 area.

l For horizontal polarization, from 500 MHz -1 GHz, field uniformity (0 dB to -3 dB) can beachieved in the vertical direction. In thehorizontal direction, field uniformity isachieved up to a width of 2.5m (i.e. , 0.6 mabove the floor, 2.5 (w) x 2.4(h) m2).* Field distribution data are based on free-space condition. Performance may vary with different ground treatments.

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uniform area

h= 1.0 mh= 1.8 m

d= 3.5 m

switch polarization

ETS-EMCO’s custom pedestal allows antenna height, tilt-angleand polarization to be easily adjusted.

Figure 2. ETS-EMCO 3144G LPDA antenna modeled geometry.

The field distribution in the required area(0.6 m above the floor, 5 x 2.4 m2) for thesetup in Figure 2 is simulated. Note thatthe antenna is tilted with respect to thetest area. Typical frequencies are shownbelow in Figures 3 -14. Field distributiondata at additional frequencies areavailable upon request.

Standard Configuration

l LPDA antenna (100 MHz- 1 GHz) withfemale C connector

Options

l Custom pedestal with angle tilt control(0-21°), and polarization control(horizontal and vertical)

l Mounting bracket

l Model 2X90 Controller

Electrical Specifications

Frequency: 100 MHz - 1 GHzInput impedance: 50 ΩVSWR: 1.2:1 typical, 2:1maximumMaximum RF input power: 2 kWRF connector: Type C, female

Physical Specifications

DimensionsLength 170.2 cm (67 in)Width 210.8 cm (83 in)Height 9.5 cm (3.7 in)Weight 4.5 kg (10 lb)

Custom Pedestal Dimensions:Length 1.2 m (3.9 ft)Width 1.2 m (3.9 ft)Height (adjustable) 1.6 m - 2.0 m (5.2 ft-6.5 ft)

Figure 1. ETS-EMCO 3144G vertical polarization setup schematic (can be switched to horizontal polarization).Antenna height is 1.8 m, tilted to boresight to a 1 m height point in the uniform field area.

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Horizontal Polarization:

Figure 3. E-field (V/m) in the uniform field area for ETS-EMCO 3144Ghorizontally polarized d=3.5 m (setup shown in figure 2), f=100 MHz

filename: r44hd35f100.ps

Figure 4. E-field (V/m) in the uniform field area for ETS-EMCO 3144G horizontally polarized d=3.5 m (setup shown in figure 2),f=300 MHz


100

66.14 68.32 70.51 72.69 74.87 77.06 79.24 81.43 83.61 85.80 87.98 90.17 92.35 94.54 96.72

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85

ETS-EMCO 3144G d=3.5m f=100 MHz

69.4186.89

69.41

72.69

100

70.02 71.96 73.89 75.83 77.76 79.69 81.63 83.56 85.50 87.43 89.36 91.30 93.23 95.17 97.10

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.13 89.36 78.73

76.79

72.93

44444




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99.6 100

64.71 66.99 69.26 71.54 73.82 76.10 78.37 80.65 82.93 85.20 87.48 89.75 92.03 94.31 96.58

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.58 90.89 78.37

71.54

79.51

100

45.26 48.80 52.33 55.86 59.39 62.92 66.45 69.98 73.51 77.05 80.58 84.11 87.64 91.17 94.70

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.47

94.70

84.1154.09

55555


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filename: r44f1000h.ps

100

36.70 40.78 44.86 48.95 53.03 57.12 61.20 65.28 69.37 73.45 77.54 81.62 85.71 89.79 93.87

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


95.92

93.87

91.83

77.54 53.03 36.70

100

37.80 41.81 45.82 49.84 53.85 57.86 61.87 65.89 69.90 73.91 77.93 81.94 85.95 89.97 93.98

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


93.98 85.95 71.91 47.83

91.97

93.98

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Vertical Polarization:

Figure 9. E-field (V/m) in the uniform field area for ETS-EMCO 3144Gvertically polarized d=3.5 m (setup shown in figure 2), f=100 MHz

filename: v44d35f100.ps



100

70.97 72.84 74.72 76.59 78.46 80.34 82.21 84.08 85.95 87.83 89.70 91.57 93.45 95.32 97.19

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85

ETS-EMCO 3144G V-pol., d=3.5m, f=100 MHz

98.13

94.38

90.64

83.15

96.25 91.57 87.83 83.1582.21

70.97

100

72.36 74.14 75.93 77.71 79.49 81.28 83.06 84.84 86.63 88.41 90.19 91.98 93.76 95.54 97.33

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


98.22 94.65 88.41 78.6077.71

72.36 90.19

97.33

96.43

77777


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FINLAND:Tel +358.2.838.3300Fax +358.2.865.1233








100

68.57 70.60 72.63 74.66 76.68 78.71 80.74 82.77 84.79 86.82 88.85 90.88 92.90 94.93 96.96

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.96

90.88

89.86

90.88

84.7989.86 86.82

68.57

100

59.02 61.66 64.31 66.95 69.59 72.24 74.88 77.53 80.17 82.81 85.46 88.10 90.75 93.39 96.03

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


97.36

89.42

81.49

73.56

92.0792.0797.36 94.71

88888




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FINLAND:Tel +358.2.838.3300Fax +358.2.865.1233






100

51.35 54.49 57.62 60.76 63.90 67.04 70.18 73.32 76.46 79.60 82.74 85.88 89.01 92.15 95.29

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.86

89.01

78.03

60.76

96.8695.29

99.7 98.9 100

47.87 51.24 54.60 57.96 61.32 64.69 68.05 71.41 74.78 78.14 81.50 84.87 88.23 91.59 94.96

-2.50 -0.94 0.62 2.19 0.60

0.97

1.35

1.72

2.10

2.47

2.85


96.64

88.23

76.46

64.69

47.87 49.55

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Antennas Log Periodic Dipole Array Antenna - Maxtech · PDF fileThe LPDA antenna is at 1.8 m...

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