Abstract

In this work, Voltage Standing Wave Ratio (VSWR) was measured in a Global System for Mobile communication base station (GSM) located in Evbotubu district of Benin City, Edo State, Nigeria. The measurement was carried out with the aid of the Anritsu site master instrument model S332C. This Anritsu site master instrument is capable of determining the voltage standing wave ratio in a transmission line. It was produced by Anritsu company, microwave measurements division 490 Jarvis drive Morgan hill United States of America. This instrument works in the frequency range of 25MHz to 4GHz. The result obtained from this Anritsu site master instrument model S332C shows that the base station have low voltage standing wave ratio meaning that signals were not reflected from the load to the generator. A model equation was developed to predict the VSWR values in the base station. The result of the comparism of the developed and measured values showed a mean deviation of 0.932 which indicates that the model can be used to accurately predict the voltage standing wave ratio  in the base station.

Key words: Voltage standing wave ratio, GSM base station, impedance matching, losses, reflection coefficient.