The Design of W - Periodic Dipole Antennas

A mathemat ica l ana lys i s of the logar i thmica l ly per iodic d ipole class of frequency independent antennas, which takes into account the mutual coupling between dipole elements, is descr ibed. A h igh speed d ig i t a l computer (ILLIAC) is used t o c a l c u l a t e t h e i n p u t impedance gain, and bandwidth, a s w e l l a s t h e i n p u t c u r r e n t and vol tage of the several elements. The PzSUltS from this mathematical model a r e shown t o be i n good ?yreement with measurements. A s t e p by step procedure, which egables one to des ign a log-periodic dipole antenna over a wide range of the parameters of input inlpedance, bandwidth, gain, and antenna size i s presented.