dBi () = = 29 25 log dBi for < where degrees Gco G1 – φr m r () = 29 25 log dBi for < where = 10(34/25) degrees Gco b b – φ φr () = dBi for < where = 70 degrees Gco –5 φb c c () = 0 dBi for < 180 degrees Gco φc Cross-polar pattern: ()  17 for 0   0 where 0 degrees Gcross Gmax –  3 dB beamwidth () 17 + for 0 < 1 where degrees Gcross = Gmax CdBi – ≤ and = 21 25 log(1) (Gmax 17)* dB C – – – ()  21 25 log  for 1   < where  = 10(26/25) degrees Gcross – ()  dBi for 2    70 degrees Gcross –5 ()  0 dBi for 70º  180 degrees Gcross where: circular antenna diameter; D: : wavelength expressed in the same unit as the diameter; : off-axis angle of the antenna relative to boresight (degrees); efficiency. Examples: = 38.0 dBi Gmax = 0.6 η = 32.6 D/λ = 2.79 degrees m = 2.92 degrees r = 17.38 dBi G1 = 10(34/25) degrees b Cross-polar: = 2.13 degrees 0 = 3.39 degrees 1  10(26/25) degrees 2 = dB C –13.25
dBi Gco () = G1 = 29 – 25 log φr dBi for m < r where degrees Gco () = 29 – 25 log φ dBi for φr < b where b = 10(34/25) degrees Gco () = –5 dBi for φb < c where c = 70 degrees Gco () = 0 dBi for φc < 180 degrees Cross-polar pattern: Gcross ()  Gmax – 17 for 0   0 where 0 degrees  3 dB beamwidth Gcross () = Gmax – 17 + CdBi for 0 ≤ < 1 where degrees and C = 21 – 25 log(1) – (Gmax – 17)* dB Gcross ()  21 – 25 log  for 1   < where  = 10(26/25) degrees Gcross ()  –5 dBi for 2    70 degrees Gcross ()  0 dBi for 70º  180 degrees where: D: circular antenna diameter; : wavelength expressed in the same unit as the diameter; : off-axis angle of the antenna relative to boresight (degrees); efficiency. Examples: Gmax = 38.0 dBi η = 0.6 D/λ = 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
R-REC-BO.1900-0-201201-I!!MSW-E.docx