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| Distribution of far-field power density and planning control distance of mobile base stations |
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Abstract In order to investigate power density distribution regularity and determine planning control distance reasonably, 2057 mobile communication base stations with various network types and carrier wave numbers in urban district of Hangzhou were selected, and the radiofrequency field power density around the antenna was measured when mobile phone traffic was in peak period. Results indicated that far-field power density of GSM base stations S∝ under the condition of distortion field (S∝ under the condition of non-distortion field), and the determination coefficient (R2) is 0.80; in the range of 20m away from antenna, about 85.91% of measured power density values around base stations is less than theoretical values, which can be calculated according to antenna nominal power and antenna gain under the condition of non-distortion field. In addition, the frequency statistical results indicated that, in the range of 1~15m away from antenna, S10 (10% of measured values are higher than the value of S10) of base stations which belong to A operator is 10.00% higher than B operator; in the range of 1~30m away from antenna, the statistical power density values S10 of base stations with double and ternate networks are 50.31% and 57.10% higher than base stations with single network respectively. So the planning control distance of mobile communication base stations determined accordingly should be 15m. Out of this range, only 0.11% of base stations power density values are above 8μW/cm2.
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Received: 17 January 2010
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