Evaluation of electromagnetic environment across Hong Kong

Pao Yue-kong Library Electronic Theses Database

Evaluation of electromagnetic environment across Hong Kong

 

Author: Kwan, Kwok-fai
Title: Evaluation of electromagnetic environment across Hong Kong
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Electromagnetic fields -- Environmental aspects -- China -- Hong Kong.
Radio frequency -- Measurement.
Department: Dept. of Building Services Engineering
Pages: 117, [11] leaves : col. ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2117574
URI: http://theses.lib.polyu.edu.hk/handle/200/2889
Abstract: This study is the first experiment of investigation of the electromagnetic environments across Hong Kong. The electromagnetic radiation level in the radio frequency band between 20MHz and 2GHz across Hong Kong has been evaluated based on field measurements. The measurements were made at numerous locations at outdoor across Hong Kong using a broadband spectrum analyzer and antenna system. The radio frequency includes FM radio channels, TV channels, public paging and mobile phone channels in USDC, CDMA, GSM and PCS. The selected sites were representative of Hong Kong east, Hong Kong west, Kowloon east, Kowloon west, N. T. east, N. T. south, N. T. west, N. T. north, Sai Kung, Cheung Chou and Lantau Island. The analysis method was to measure radio frequency (RF) level at different locations in each district to find out a location which can represent the RF level of the district and use the Safety Code 6 (SC 6) - "Limits of Human Exposure to Radiofrequency Electromagnetic Fields " to check whether the RF level in Hong Kong was exceed the safety limit or not. The results revealed that all of the measured sites were substantially less than the limits specific in the Safety Code 6 guidelines. The site with the highest radio frequency level, 16 times less than the Safety Code 6 guidelines is located Sai Kung bus terminus near Sai Kung Pier. Further analysis of the data determined that 4 sites classified as Hong Kong east, are on maximum 130 times less than the Safety Code 6 limit. The 4 survey sites classified as Hong Kong west, are on maximum 100 times less, 4 survey sites classified as Kowloon east are on maximum 54 times less, 5 survey sites classified as Kowloon west, are on maximum 38 times less, 2 survey sites classified as N.T. east are on maximum 52 times less, 6 survey sites classified as N. T. south are on maximum 17 times less, 10 survey sites classified as N. T. west are on maximum 60 times less, 3 survey sites classified as N. T. north are on maximum 200 times less, 4 survey sites classified as Cheung Chou are on maximum 187 times less, 4 survey sites classified as Lantau Island are on maximum 63 times less than Safety Code 6 limits. Also, some radio frequency spectrums in some specific frequency bands from 87MHz to 108MHz, 279MHz to 281 MHz, 420MHz to 433MHz, 440MHz to 470MHz, 470MHz to 790MHz, 835MHz to 842.5MHz, 871.59MHz to 879.09MHz, 935MHz to 960MHz and 1805MHz to 1876MHz were common at all districts and the average maximum electric field strength were 2.04-11.87mV/m, 7.11-16.15mV/m, 7.38-13.28mV/m, 20.17-61.05mV/m, 26.51-92.33mV/m, 22.31-75.17mV/m, 20.17-93.00mV/m, 43.97-91.5ImV/m respectively. Also some radio spectrums in some frequency band in some district were different from the other districts.

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