H-guide log periodic slot antenna

A novel log-periodic slot array is described which employs surface wave excitation. Violating established criterion for successful log-periodic designs, the antenna is excited at the large end of the structure, resulting in an end-fire rather than a back-fire radiation. The design offers an advantage of improved directivity by exciting two or more arrays from the same surface wave structure, and it has a potential for high power handling capability, since the dimensions at the feed end need not be small.