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Facilities

FAQ Topics

Facilities FAQ

1. What are the temperature and humidity requirements for an antenna test range?

2. What is the largest near-field scanner that I can fit in my range?

3. How can I determine the power-handling capability of the absorber in my range?

4 .Absorber power-handling is often specified in various ways. How can I convert between received



1. What are the temperature and humidity requirements for an antenna test range?

A nominal temperature range from 20 to 25 deg C (68 to 77 deg F) is acceptable, but during measurements for accurate results, it is recommended to hold the temperature to within +/- 0.5 Deg C (+/- 1 Deg F) ideally, or at least +/- 1 Deg C (+/- 2 Deg F). Humidity levels of 40-60% are recommended. A wider range is tolerable, but may be detrimental to equipment and absorber. Temperature stability requirements are more critical at higher frequencies.

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2. What is the largest near-field scanner that I can fit in my range?

Minimum room dimensions are shown on the NSI web site summary page for all of NSI's near-field scanners.

100V- Portable vertical planer

200V - Small vertical planar

300V - Medium vertical planar

400V - Large vertical planar

500H - Horizontal planar

600C - Cylindrical

700S - Spherical

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3. How can I determine the power-handling capability of the absorber in my range??

To determine the power-handling cabability of any absorber, consult the absorber manufacturer's specification. As an example, pyramidal absorber from Cuming Microwave is available with three levels of power-handling capability, as shown below:

Mfg PN
Description
Power-handling
Notes
CRAM-SFC Standard Pyramidal Foam 1.25 W/in**2
(2 kW/m**2)
Assumes temperature controlled room, dependent upon frequency and application
CRAM-EVA Pyramidal Open-cell Foam 2 W/in**2 (Typical, without forced air cooling) Open-cell foam permits air circulation to increase power handling to ~10 W/in**2
CRAM-SFC-HC Pyramidal Honeycomb 10 W/in**2 (Typical, without forced air cooling) Phenolic coated honeycomb permits forced air to increase power handling capability (see mfg spec).

For unit conversion, see FAQ #4

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4. Absorber power-handling is often specified in various ways. How can I convert between received power and power density? How can I convert between V/m and W/m**2? How can I convert between W/in**2 and W/cm**2?

To convert between received power or electric field strength and power density, see the conversion tool located at: http://www.giangrandi.ch/electronics/anttool/field.html

To convert between V/m and W/m**2, see the conversion tool located at:
 http://www.powerwatch.org.uk/science/unitconversion.asp

To convert between W/in**2 and W/cm**2, see the conversion tool located at:
http://www.unitconversion.org/unit_converter/heat-flux-density.html

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