H-GUIDE LOG-PERIODIC SLOT ANTENNA.
CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB
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A theoretical and experimental investigation of an end-fire as contrasted to a conventional back-fire design flush-mounted log-periodic slot antenna is described. The antenna consists of two-periodic slot arrays cut in one of the metal walls of a tapered Hguide. The antenna receives excitation at the large end of the structure and radiates toward the small end, yet retaining pattern integrity over large bandwidth. This is made possible by judiciously employing the surface wave properties of a broadband TEsub01 mode propagated in a tapered H-guide. It has been shown theoretically that the energy can be transported from the large end of the structure to a desired active region located near the small end, without appreciably exciting the preceding portions of the antenna. The results of the near field measurements, antenna VSWR, and radiation patterns are presented. The antenna radiates essentially constant patterns over a 31 bandwidth with half-power beamwidths of approximately 20 degrees in the E- and H-planes. The results of this study indicate that the antenna can generate a narrow beam and is potentially capable of transmitting high power. Author
- Electrical and Electronic Equipment