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AN0005

更新时间： 2024-09-15 03:18:43

品牌	Logo	应用领域
威讯 - RFMD		/
页数	文件大小	规格书
2页	25K
描述
Converting Field Strength to Power

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Converting Field Strength to Power

Background

Precompliance testing should be performed during the design process. This can be done with a GTEM cell or at a com-

pliance test laboratory. It is recommended that precompliance testing be performed so that there are no surprises during

final compliance testing. This will help keep the product development and release on schedule.

Working with a laboratory offers the benefit of years of compliance testing experience and familiarity with the regulatory

issues. Also, the laboratory can often provide feedback that will help the designer make the product compliant.

On the other hand, having a GTEM cell or an open air test site locally offers the designer the ability to rapidly determine

whether or not design changes impact the product's compliance. Set-up of an open air test site and the associated cali-

bration is not trivial. An alternative is to use a GTEM test cell.

After the design has been completed and passes compliance testing, final certifications will need to be obtained. Appli-

cation will need to be made with the respective regulatory bodies for the geographic region in which the product will be

operated.

Derivation of Conversion Factors

In the Code of Federal Regulations Title 47, Part 15 there are numerous tables containing limits for emission levels.

These limits are usually expressed as field strength in microvolts per meter at a given distance from the radiator. While

one could use a field strength meter to measure the emissions of a device, such a test setup is not available in all labora-

tories. However, most RF laboratories have spectrum analyzers. Thus, it would be desirable to establish a relationship

between field strength and power.

The following derivation is simplistic and makes the following assumptions:

•

the emission is radiating isotropically

the signal is being radiated into a sphere

the power is being radiated evenly over the surface of that sphere

the efficiency of the radiator is unity

Represent the power density as

P_Trans

4 π D²

---------------------

P_Density

Then the electric field, in microvolts per meter, can be represented as

377 P_Trans

E = 1 10⁶-----------------------------

4 π D²

Now solve the equation to isolate transmitted power

4 π D²



²

--------------------- ---------------

P_Trans

1 10^6



377

For the preceding equations the unit of power (P) is Watts, the unit of field strength (E) is microvolt per meter, the unit of

distance (D) is meters.

15-21

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