ITU-R F 1245-2-2012 Mathematical model of average and related radiation patterns for line-of-sight point-to-point fixed wireless system antennas for use in certain coodination studncy .pdf
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1、 Recommendation ITU-R F.1245-2(03/2012)Mathematical model of average and related radiation patterns for line-of-sight point-to-point fixed wireless system antennas for use in certain coodination studies and interference assessment in the frequency range from 1 GHz to about 70 GHzF SeriesFixed servic
2、eii Rec. ITU-R F.1245-2 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on th
3、e basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy
4、on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for
5、 Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and pla
6、y-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications an
7、d meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under
8、the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2012 ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.1245-2 1 RECOMMENDATION ITU-R F.1245-2*Mathematical model of average
9、 and related radiation patterns for line-of-sight point-to-point fixed wireless system antennas for use in certain coordination studies and interference assessment in the frequency range from 1 GHz to about 70 GHz (Question ITU-R 110-2/5) (1997-2000-2012) Scope This Recommendation provides average a
10、nd related reference radiation patterns for line-of-sight point-to-point fixed wireless system (FWS) antennas in the frequency range from 1 GHz to about 70 GHz. The analysis in this Recommendation may be used in certain coordination studies and interference assessments when particular information co
11、ncerning the FWS antenna is not available. The ITU Radiocommunication Assembly, considering a) that the reference radiation pattern of line-of-sight point-to-point fixed wireless system (FWS) antennas stated in Recommendation ITU-R F.699 gives the peak envelope of side-lobe patterns; b) that if the
12、peak envelope radiation pattern is used in the assessment of the aggregate interference consisting of many interference entries, the predicted interference will result in values that are greater than values that would be experienced in practice; c) that, therefore, it is necessary to use the antenna
13、 radiation pattern representing average side-lobe levels in the following cases: to predict the aggregate interference to a geostationary or non-geostationary satellite from numerous radio-relay stations; to predict the aggregate interference to a radio-relay station from many geostationary satellit
14、es; to predict interference to a radio-relay station from one or more non-geostationary satellites under the continuously variable angle which should be averaged; in any other cases where the use of the radiation pattern representing average side-lobe levels is appropriate; d) that a simple mathemat
15、ical formula is preferable to the radiation pattern representing average side-lobe levels; e) that a mathematical model is also required for generalized radiation patterns of antennas for statistical interference analyses involving a few interference entries such as from geostationary satellites int
16、o systems in the fixed service, *This Recommendation should be brought to the attention of Radiocommunication Study Groups 4 and 7. 2 Rec. ITU-R F.1245-2 recommends 1 that, in the absence of particular information concerning the radiation pattern of the line-of-sight FWS antenna involved, the mathem
17、atical model of the average radiation pattern as stated below should be used for the applications referred to in considering c); 2 that the following mathematical model of the average radiation pattern should be adopted for frequencies in the range 1-40 GHz and provisionally in the range 40 GHz to a
18、bout 70 GHz; 2.1 in cases where the ratio between the antenna diameter and the wavelength is greater than 100 (D/ 100), the following equation should be used (see Notes 1 and 7): G() = Gmax 2.5 1032Dfor 0 3 dB or when the radio-relay station is outside the main beam of the antenna of the other servi
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