The initial parameters are established for a classical ADC configuration  with dimensions similar to those of the previous classical omnidirectional
ADE antenna: [W.sub.A] = 10[lambda], [D.sub.M] = 24[lambda], [V.sub.S] = 10.7[lambda], [D.sub.B] = 2.4 [lambda], [z.sub.B] = 0, and [gamma] = 102[degrees].
The antennas proposed in this study have two different versions, where the first one possesses better omnidirectionality and axial ratio performances but narrow frequency bandwidth, and the second one has wider bandwidth but lower omnidirectional
and axial ratio performances.
vision systems have further advantages, comparing to conventional vision systems.
Then the inverse kinematics equation of z'th omnidirectional
The kinematic model of the three-wheeled omnidirectional
mobile robot is described in  and is summarized by
Radially uniform omnidirectional
metasurfaces will be considered first (Sections 2.1 and 2.2), for which the local surface impedance is independent of the radial coordinate [[Z.bar].sup.lin.sub.S] = [[Z.bar].sup.lin.sub.S]([k'.sub.t]).
Owing to the advantage of one-shot seamless panoramic imaging, catadioptric omnidirectional
imaging systems consisting of conventional cameras and curved mirrors for capturing 360[degrees] field of view are widely used in many vision applications, such as aerial photographic reconnaissance, intelligent transportation system, robot navigation, surveillance, medical applications, and video conferencing [1-5].
We propose to extend this approach to an omnidirectional
vision-based system for economic reasons.
However, in some special conditions, it is requisite for the antennas to have omnidirectional
radiation patterns to cover a large service area, such as the portable access points or base stations.
Recently, it has been theoretically and experimentally demonstrated that an omnidirectional
Bragg reflector can be realized using one dimensional (1D) photonic crystals.
We cite as examples of PC devices, resonant microcavities and omnidirectional
mirrors which are precisely the subject of the present work.