Conceptual Design of Compact Planar Quasi-Isotropic Antenna

Design guidelines of a circular sector compact planar quasi-isotropic antenna are presented. General relationship between the non-uniformity and flared angle is deduced at first. Then, it is employed to determine the usable flared angle range for non-uniformity . Based upon the design guidelines, a compact planar quasi-isotropic antenna is conceptually designed and numerically studied. It is seen a circular sector magnetic dipole antenna with flared angle of 300° can exhibit both quasi-isotropic radiation characteristic and compact size.