Page 201 - Satellite Communications, Fourth Edition

Antennas 181

Disc
antenna

Ground plane Balanced coax feed
(a)

Ground planes
(Bonded together)

(b)

Slot antenna

Ground planes
(Bonded together)

Stripline
(c)
Figure 6.32 (a) a disc antenna with balanced coaxial feed; (b) a coplanar waveguide
antenna; (c) a triplate slot antenna.
through the individual phase shifters. The active arrangement has the
advantage that the failure of one amplifier causes degradation but not
complete loss of signal, but this has to be offset against the greater cost
and complexity incurred.