M. Orefice et P. Pirinoli, DUAL-REFLECTOR ANTENNA WITH NARROW BROADSIDE BEAM FOR OMNIDIRECTIONALCOVERAGE, Electronics Letters, 29(25), 1993, pp. 2158-2159
A new type of high gain omnidirectional antenna is presented, particul
arly suited for higher frequencies (e.g. millimetre waves): it is obta
ined with an axially symmetric dual reflector system, fed with an unco
nventional feed with conical pattern. The feed radiated field, after r
eflection on the parabolic subreflector and on the conical main reflec
tor, is uniformly scattered in the plane perpendicular to the axis of
the system, with vertical polarisation and narrow vertical beamwidth.