1、 Rec. ITU-R BO.1213-1 1 RECOMMENDATION ITU-R BO.1213-1 Reference receiving earth station antenna pattern for the broadcasting-satellite service in the 11.7-12.75 GHz band (Question ITU-R 73/6) (1995-2005) Scope This Recommendation intends to establish reference earth station co-polar and cross-polar
2、 antenna patterns for the broadcasting-satellite service (BSS) in the 11.7-12.75 GHz band. The ITU Radiocommunication Assembly, considering a) that a common reference antenna pattern was used at WRC-97 and WRC-2000 for revising the Regions 1 and 3 broadcasting-satellite service (BSS) Plan; b) that t
3、his same reference antenna pattern was used at WRC-03 for revising the inter and intraregional/inter- and intraservice sharing criteria contained in Appendix 30 of the Radio Regulations (RR); c) that data from measurements of BSS receiving antennas support this same reference antenna pattern1; d) th
4、at this same reference antenna pattern may be useful for interservice sharing between the BSS and other services and for other coordination purposes, recommends 1 that the co-polar and cross-polar antenna patterns given by formulae provided in Annex 1 should be recognized as reference earth station
5、antenna patterns for the BSS in the 11.7-12.75 GHz band. 1It should be noted that the antenna measurements were performed on single-feed antennas. 2 Rec. ITU-R BO.1213-1 Annex 1 Antenna pattern formulae: These formulae are valid for D/ 11: Co-polar pattern: 231052)(=D.GGmaxcofor 0 mwhere: 0025.01GGD
6、maxm= =2log10DGmaxG1= 29 25 log r, and Dr= 95 Gco() = G1for m r Gco() = 29 25 log for r bwhere b= 10(34/25) Gco() = 5 dBi for b 70 Gco() = 0 dBi for 70 180 Cross-polar pattern: Gcross() = Gmax 25 for 0 0.25 0where 00025.032D= = 3 dB beamwidth +=00190250825)(.GGmaxcrossfor 0.25 0 0.44 0Gcross() = Gma
7、x 17 for 0.44 0 0Gcross() = Gmax 17 + C010for 0 1where 1875.10201= and C = 21 25 log(1) (Gmax 17)*Gcross() = 21 25 log for 1 2where 2= 10(26/25) Gcross() = 5 dBi for 2 70 Gcross() = 0 dBi for 70 180 *The value of C must be less than 0 for any combination of antenna efficiency () and D/. Rec. ITU-R B
8、O.1213-1 3 where: D: equivalent antenna diameter : wavelength expressed in the same unit as the diameter : off-axis angle of the antenna relative to boresight (degrees) : antenna efficiency. Examples: For the 60 cm reference antenna pattern used at WRC-03 for revising the interregional/interservice
9、sharing criteria contained in RR Appendix 30, the following parameters apply: Co-polar: Gmax = 35.5 dBi = 0.65 D/ = 23.4 (assumed frequency is 11.7 GHz) m= 3.98 r= 4.06 G1= 13.78 dB b= 10 (34/25)Cross-polar: 0= 2.96 1= 4.73 2 = 10.96 C = 14.36 dB The corresponding reference antenna pattern is given
10、in Fig. 1. 4 Rec. ITU-R BO.1213-1 For the 45 cm reference antenna pattern used at WRC-03 for revising the interregional/interservice sharing criteria contained in RR Appendix 30, the following parameters apply: Co-polar: Gmax= 33.3 dBi = 0.65 D/ = 18.3 (assumed frequency is 12.2 GHz) m= 5.15 r= 5.19 G1= 11.12 dB b= 10(34/25)Cross-polar: 0 = 3.79 1 = 6.04 2 = 10.96 C = 14.83 dB The corresponding reference antenna pattern is given in Fig. 2. Rec. ITU-R BO.1213-1 5
