MIL-STD-188-164B
d. |
1,350 |
MHz ± |
400 |
MHz |
e. |
1,500 |
MHz ± |
500 |
MHz |
f. |
2,700 |
MHz ± |
500 |
MHz |
4.4 Military Ka-band Antenna Requirements.
4.4.1 Antenna sidelobe levels and transmit EIRP Spectral Density (ESD). The antenna sidelobe and ESD requirements are described in a and b (below):
a. De/A � 50. The gain of the antenna in the GSO
plane, including radome effects, shall be such that at least 90% of the sidelobe peaks do not exceed the mask given below and no individual peak exceeds the mask by more than 3dB.
where
G(0) = 29-25 log10 0 (dBi) for 1° or 100 AIDe ° (whichever is larger, up to 2°) � 0 < 20°
G(0) = -3.5 (dBi) for 20° � 0 � 26.3°
G(0) = 32-25 log10 0 (dBi), for 26.3° < 0 < 48°
G(0) = -10 (dBi), for 48° � 0 � 180°
G = gain relative to an isotropic antenna
0 = off-axis angle in the direction of the satellite referred to the main-lobe axis
De = equivalent antenna diameter, and
A = wavelength (same units as De, computed from 31.0
GHz as reference frequency)
b. EIRP Spectral Density (ESD). For all terminals, ESD in the GSO plane shall not exceed the following:
ESD(0) |
= |
-6.4 - 25 log10 0 (dBWIHz) for |
2.0° � 0 < 20.0° |
ESD(0) ESD(0) |
= = |
-38.9 (dBWIHz) for 20.0° � 0 � -3.4 - 25 log10 0 (dBWIHz) for |
26.3° 26.3° <0 < 48.0° |
ESD(0) = -45.4 (dBWIHz) for 48° � 0 � 180°
25
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