DocumentCode :
1782096
Title :
Uncertainties in sVSWR and a proposal for improvement using vector response measurements
Author :
Zhong Chen
Author_Institution :
ETS-Lindgren, Cedar Park, TX, USA
fYear :
2014
fDate :
12-16 May 2014
Firstpage :
274
Lastpage :
277
Abstract :
Site Voltage Standing Wave Ratio (sVSWR) as specified in CISPR 16-1-4 has been adopted broadly for validating test sites above 1 GHz. To measure the standing wave at a location, responses between two antennas are measured with varying separation distances. In a sVSWR measurement, the receiving antenna remains stationary, while the transmitting antenna is moved to six sample positions along a 40 cm transmission path. While it was maintained that six positions were adequate to sample a standing wave [1], another study [2] pointed out that the standing wave is under-sampled, and the site evaluation can be overly optimistic. We further investigate the adequacy of the number of samples, as well as the suitability of the 40 cm travel length. In addition, sVSWR measurements are only required at a frequency interval of 50 MHz. It is shown in this paper that frequency under sampling also takes place. This study investigates the effectiveness of the sVSWR method as defined in CISPR 16-1-4 using geometrical optics simulations and measurements. An alternative method which evaluates sVSWR using vector response measurements is proposed. It overcomes the difficulties with the CISPR sVSWR approach.
Keywords :
geometrical optics; receiving antennas; transmitting antennas; CISPR 16-1-4; antennas; frequency 50 MHz; geometrical optics; receiving antenna; sVSWR; site voltage standing wave ratio; size 40 cm; transmitting antenna; vector response measurements; Antenna measurements; Frequency measurement; Receiving antennas; Time-domain analysis; Transmitting antennas; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electromagnetic Compatibility, Tokyo (EMC'14/Tokyo), 2014 International Symposium on
Conference_Location :
Tokyo
Type :
conf
Filename :
6997145
Link To Document :
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