RES553 – 351 – FIGURE 1* (WRC-12) Reference patterns for satellite antennas with fast roll-off in the main beam Gmax = 44.45 – 10 log (φ01 φ02) dBi (WRC-12) Curve A: dB relative to main beam gain −12 (φ/φ0)2 for 0 ≤ (φ/φ0) ≤ 0.5 –2 0 0 /(/)–12 Bmin x for 0.5 < (φ/φ0) ≤ Bmin x 0 1.45 –25.23 for 1.45 (/)1.45 0 0 B x min −(22 + 20 log (φ/φ0)) for (φ/φ0) > 1.45 after intersection with Curve B: Curve B. Curve B: Minus the on-axis gain (Curve B represents examples of four antennas having different values of φ0 as labelled in Fig. 1. The on-axis gains of these antennas are approximately 39.9, 42.9, 45.9 and 48.9 dBi, respectively) (WRC-12) where: φ: off-axis angle (degrees) φ0: cross-sectional half-power beamwidth in the direction of interest (degrees) φ01, φ02: major and minor axis half-power beamwidth, respectively, of elliptical beam (degrees) (WRC-12) 0 0.5 1 min x B where: Bmin = 0.6° _______________ * Figure 1 represents patterns for some values of φ0. (WRC-12) Relative angle (φ/φ0 ) −20 −10 −30 −40 −50 0.1 0.2 0.5 1 2 5 10 20 50 0 B min = 0.6° φ0 = 0.6° φ0 = 1.2° φ0 = 2.4° φ0 = 4.8° Relative antenna gain (dB)