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Antenna Fundamentals and Formulas for Determining EMC Field Levels in Radiated Immunity Testing
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From Instruments for Industry, Inc.
RF transmitting antennas rank high on the list of major technical issues that include RF power amplifiers and the test standards themselves. The purpose of this application note is to explain some of the standard antenna terms and the basic math required to calculate the RF field level with a given RF input power signal. This is the basis of a Radiated Immunity test system. Products & Services
RF amplifiers are devices that accept a varying input signal and produce an output signal that varies in the same way, but with larger amplitude.
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Antennas are structures or devices used to collect or radiate electromagnetic waves.
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RF attenuators are circuits that reduce the power level of a signal by a certain amount (gain), with little or no reflection. They reduce the output signal with respect to the input and measure the power reduction in decibels (dB).
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RF waveguide components are circular, elliptical or rectangular metal tubes or pipes through which electromagnetic waves are propagated in microwave and RF communications. The wave passing through the medium is forced to follow the path determined by the physical structure of the guide.
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RF power dividers and RF power combiners are circuits that accept input signals and deliver multiple outputs that are equal in phase and amplitude. There are two basic product categories: passive and active.
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Learn more about RF Power Dividers and RF Power Combiners
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Topics of Interest
7.1 RF Immunity
Until the EMC Directive, most commercial immunity testing was not mandatory, but driven by customer requirements for reliability in the presence of interference. Military and...
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7.1 Introduction
The types of antenna commonly used for RF radiated susceptibility testing are treated separately from antennas used in emission measurements as the antenna parameters relating to...
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5.1 Introduction
In Chapter 4 we presented a detailed derivation of the coordinate free form of the near-field to far-field transform employing the plane wave spectrum representation. We now take...
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In a Radio Frequency Identification (RFID) application, an antenna coil is needed for two main reasons: To transmit the RF carrier signal to power up the tag To receive data signals from the tag An RF...
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REFERENCES
Dash, G., and I. Strauss, Inside Part 15—Digital Device Approval, Compliance Engineering, 1995
Annual Reference Guide, A11–A18.
EN-55011, Limits and Methods of Measurement of...
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