2.2 Antenna unit, IC-115
2-5
2.2.2 Antenna element
Antenna unit consists of the element, the 3 dB hybrid and the reflector. The antenna unit
is developed by FURUNO and called “DAISY LOOP ANT antenna”. ANT RF output,
42 dBm of 1.6 GHz is radiated from the antenna by 14 dBW of EIRP. The receiving
signal of the power flux density, -148 dBW/m
2
to –136 dBW/m
2
of 1.5 GHz is input to
ANT RF receiving circuit with the level of –141 dBm to –129 dBm.
- TX/RX antenna gain: more than 1.3 dBi
(When the antenna elevation angle is +5°.)
- Directional characteristics
Horizontal: Non-directivity
Vertical:
1.3 sin to 1.5 sin (El - 5) dBi
(+5° < El <+90°)
-2.7 cos + 4 cos [4.5 (cos - 5) ] dBi
(-15° < El <+5°)
- Polarization:
Right circular polarization wave
Fig.2.2.2 Antenna element
Fig.2.2.3 shows the vertical directivity diagram at 1.5GHz band.
(Horizontal Directivity: Non-directivity)
Fig. 2.2.3 Vertical directivity diagram
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