Antenna Element - Furuno FELCOM 15 Service Manual

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
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.2.2.3 shows the vertical directivity diagram at 1.5GHz band.
(Horizontal Directivity: Non-directivity)
2
to –136 dBW/m
Fig.2.2.2 Antenna element
Fig. 2.2.3 Vertical directivity diagram
2-5
2.2 Antenna unit, IC-115
2
of 1.5 GHz is input to