Atec EMCO-3101-02-03 User Manual download pdf

5656

i[email protected]

www.ets-lindgren.com

USA:

Tel +1.512.531.6400

Fax +1.512.531.6500

FINLAND:

Tel +358.2.838.3300

Fax +358.2.865.1233

UK:

Tel +44.(0)1438.730.700

Fax +44.(0)1438.730.750

ONLINE:SINGAPORE:

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MODEL 3101

Model 3101

200 MHz – 1 GHz

Model 3102

1 GHz – 10 GHz

Model 3103

100 MHz – 1 GHz

EMCO’S BROADBAND CONICAL LOG SPIRAL ANTENNAS show

minimal pattern change over their wide operating frequency

range of 100 MHz to 10 GHz. All antennas in this series have

moderate gain and low VSWR. Three models offer you a choice

in size, frequency range, and polarization.

Once used exclusively for MIL-STD and SAE testing, conical

log spiral antennas are effective for other types of measure-

ments too. For example they can be used for close-in “quick-

looks” to find the spectral characteristics of RF emissions. For

immunity testing , conical log spirals generate reasonable field

strengths with modest power input. By placing conical log

spiral antennas in a vertical position with respect to the ground

plane, they also can be used as omni-directional, horizontally

polarized antennas for electromagnetic site surveys.

EMCO Conical Log Spiral Antenna Features

Circular or Linear Polarization

EMCO’s conical log spiral antennas will receive both circular

polarized and linear polarized fields (with a 3 dB variance for

linear fields) under normal operating conditions.

Low VSWR

Average VSWR for the Model 3101 is 2.4:1. The Model 3102

averages a 1.6:1 VSWR and the Model 3103 averages

1.9:1 VSWR.

Compact Size

The compact size of EMCO’s conical log spiral antennas makes

them ideal for use in anechoic chambers and shielded

enclosures where space is limited and proximity effects must

be minimized.

Quality Construction

EMCO’s conical log spiral antennas are made with spiral

windings of coaxial cable attached to the outside of a fiberglass

cone. Outside windings improve heat dissipation. This cone is

attached to a delrin rod equipped with an aluminum base. The

antenna mounting base accepts standard 1/4 in x 20 threads

from an EMCO tripod or most other tripods.

Choosing Your Model: Three Models

with Frequency Ranges of 100 MHz to 10 GHz

100 MHz to 1 GHz

The Model 3103 conical log spiral antenna is similar to Models

3101 and 3102 except that it has the lowest frequency range

and it is largest in size. Length is 102.0 cm (40 in) diameter is

66.0 cm (26.0 in). The design is patterned on NASA drawings.

200 MHz to 1 GHz

The Model 3101 conical log spiral antenna was designed by

the Department of Defense for MIL-STD-461E measurements.

The original drawings provide the basis for our Model 3101.

Length is 81.3 cm (32.0 in) and diameter is 33.0 cm (13.0 in).

1 to 10 GHz

The Model 3102 conical log spiral antenna is similar to the

Model 3101 but has a higher frequency range and is smaller in

size. Length is 38.1 cm (15 in) and diameter is 12.7 cm (5.0 in).

● Circular Polarization

● Extremely Low VSWR

● Compact Size

● Unique Applications

● Quality Construction

Conical Log Spiral

1 2 3 4

Conical Log Spiral 1

Summary of Contents

Page 1 - Conical Log Spiral

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Atec EMCO-3101-02-03 User Manual

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