1、 Recommendation ITU-R BO.1900(01/2012)Reference receive earth station antenna pattern for the broadcasting-satellite service in the band 21.4-22 GHz in Regions 1 and 3BO SeriesSatellite deliveryii Rec. ITU-R BO.1900 Foreword The role of the Radiocommunication Sector is to ensure the rational, equita
2、ble, 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 the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication
3、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 on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution
4、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 Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information databas
5、e 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 play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed serv
6、ice 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 and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spe
7、ctrum 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 the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2012 ITU 2012 All rights reserv
8、ed. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BO.1900 1 RECOMMENDATION ITU-R BO.1900 Reference receive earth station antenna pattern for the broadcasting-satellite service in the band 21.4-22 GHz in Regions 1 and 3 (2012) Sc
9、ope This Recommendation provides the reference receiving earth station antenna patterns for the BSS in the band 21.4-22.0 GHz in Regions 1 and 3 for sharing studies. The ITU Radiocommunication Assembly, considering a) the need for detailed information on radiation patterns of receiving earth station
10、 antennas for the broadcasting-satellite service (BSS); b) that the determination of coordination requirements and/or interference assessments between geostationary-satellite systems belonging to the BSS in the band 21.4-22.0 GHz in Regions 1 and 3, as well as between BSS earth stations and other se
11、rvices sharing the same frequency band, significantly depends on the accuracy of reference antenna patterns used in analysis; c) that measured data in support of an improved receive antenna reference pattern is available; d) that Recommendation ITU-R S.1717 specifies an electronic data file format f
12、or earth station antenna patterns, recommends 1 that the co-polar and the cross-polar antenna patterns given by formulae provided in Annex 1 should be considered as reference receive earth station antenna patterns for the BSS in the band 21.4-22.0 GHz. 2 Rec. ITU-R BO.1900 Annex 1 Reference receive
13、earth station antenna patterns for the BSS in the band 21.4-22.0 GHz Antenna pattern formulae: These formulae are valid for D/ 321: Co-polar pattern: ()23105.2=DGGmaxcodBi for 0 mwhere: 0025.01GGDmaxm=degrees =2log10DGmaxdBi Gco() = G1= 29 25 log rdBi for m r where Dr= 95 degrees Gco() = 29 25 log d
14、Bi for r bwhere b= 10(34/25)degrees Gco() = 5 dBi for b cwhere c= 70 degrees Gco () = 0 dBi for c 180 degrees Cross-polar pattern2: Gcross() = Gmax 17 for 0 0where 00025.032D=degrees = 3 dB beamwidth Gcross() = Gmax 17 + C010dBi for 0 1where 1875.10201= degrees and C = 21 25 log(1) (Gmax 17)*dB Gcro
15、ss() = 21 25 log for 1 2where 2= 10(26/25) degreesGcross() = 5 dBi for 2 70 degrees Gcross() = 0 dBi for 70 180 degrees 1In the band 21.4-22 GHz, the minimum value of D/ ratios for which antenna measurements were conducted is 32. Further study is needed when using this antenna pattern with antennae
16、having a smaller D/ ratio. 2Further study may be needed to have better characteristics in the vicinity of the boresight. *The value of C must be less than 0 for any combination of antenna efficiency () and D/. Rec. ITU-R BO.1900 3 where: D: circular antenna diameter;3: wavelength expressed in the sa
17、me unit as the diameter; : off-axis angle of the antenna relative to boresight (degrees); : antenna efficiency. Examples: Co-polar: Gmax= 38.0 dBi = 0.6 D/ = 32.6 m= 2.79 degrees r= 2.92 degrees G1= 17.38 dBi b= 10(34/25)degrees Cross-polar: 0= 2.13 degrees 1= 3.39 degrees 2 = 10(26/25)degrees C = 13.25 dB 3The mask above is based on measurements on circular reflectors. Additional measurements would be necessary for elliptical antennas.
