ANALYSIS AND DESIGN OF BEAM-SHAPED RECTANGULAR POLYROD ANTENNAS

Theoretical and experimental investigations on the near field and radi ation characteristics show a fairly good agreement which justifies the TE(11)(x) mode of excitation. Eight polyrod antennas of different con figurations were built and tested as functions of taper angles, straig ht and curved axial lengths, and frequency of excitation. It is found that the radiation patterns. cross-polarization level, beamwidth and g ain could be controlled not only by the axial length and taper angles but also by shaping the axis of the polyrods in order to realize an op timum design.