Abstract
A method of Standard Site Method (SSM) in the American National Standards Institute’s ANSI C63.5 is described in the frequency ranges from 30 MHz to 1000 MHz. And a measurement system is set up for determining antenna factors (AF) of antennas on an Open Area Test Sites (OATS). AF of antennas including log-periodic antenna and biconical antenna is measured with SSM method by Shanghai Institute of Measurement and Testing Technology (SIMT), which shows good agreement to data measured by National Institute of Metrology (NIM). In the end, it analyzes the measurement uncertainty of SIMT in the 30 MHz to 1000 MHz frequency band and does comparison to that of NIM.
Highlights
High growth in the electromagnetic compatibility (EMC) field makes antennas absolutely important part in EMC test
antenna factors (AF) of antennas including log-periodic antenna and biconical antenna is measured with Standard Site Method (SSM) method by Shanghai Institute of Measurement and Testing Technology (SIMT), which shows good agreement to data measured by National Institute of Metrology (NIM)
The measurement methods are prescribed in standards such as those published by the ANSI and CISPR [1]-[6]
Summary
High growth in the electromagnetic compatibility (EMC) field makes antennas absolutely important part in EMC test. There are two reasons below: 1) EMC test need: Antennas are used in many key EMC tests, antenna factors (AF) determined is a major work in making field strength measurements accurate for EMC compliance. 2) Site validation need: Antennas are used to validate the performance of test sites such as Open Area Test Sites (OATS) and anechoic chambers, by measuring the parameter of normalized site attenuation (NSA) with ANSI C63.4 standard. Three commonly used measurement methods used to calibrate the AF are Reference Antenna Method (RAM), Equivalent Capacitance Substitute Method (ECSM) and Standard Site Method (SSM). These methods’ advantages and limitations are illustrated clearly in many papers. This paper provides the setup of SSM test system on OATS in Zhejiang Province of China
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