ITU-R QUESTION 306-2002 Transmitting and receiving antennas at VHF and UHF《甚高频和特高频发射和接收天线》.pdf
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1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.30-2002-MSW-E.DOC 22.10.03 15.07.10 QUESTION ITU-R 30/6*Transmitting and receiving antennas at VHF and UHF (1990-1993-1994-1995-2002) The ITU Radiocommunication Assembly, considering a) that transmitting and receiving antenna characteri
2、stics are required for frequency planning; b) that planning the most efficient spectrum use often requires establishing the antenna radiation patterns to a high degree of accuracy; c) that planning the most efficient spectrum use may imply using the same antenna for several emissions; d) that in est
3、ablishing transmitting radiation patterns, account must be taken of the influence of the supporting structure, significant nearby structures and the electrical stability of the antenna assembly; e) that it is essential to verify the antenna radiation pattern by measurements; f) that the RF power den
4、sity in the vicinity of transmitting antennas is significant; g) that the Radiocommunication Study Groups have already made significant studies on the radiation characteristics of LF, MF, HF and satellite antennas; h) that comprehensive information on the characteristics of transmitting and receivin
5、g antenna systems at VHF and UHF (including those for direct satellite broadcasting use at frequencies above 1 GHz) is not readily available in the ITU-R publications, decides that the following Question should be studied 1 What are the radiation patterns of VHF and UHF transmitting and receiving an
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