An investigation into the potential for developing a successful log-periodic half square antenna with dual feed
Johnsen, John Richard
Adler, Richard W.
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The investigation of a uniformly periodic half square array antenna with dual feed was conducted to provide more information about the potential of the structure as a log-periodic antenna for use by the military. Utilizing the Numerical Electromagnetics Code (NEC), an experimental investigation of the near field characteristics and the far field radiations patterns was conducted on a modeled version of the structure to identify the necessary performance characteristics of a successful log-periodic antenna. In the near field investigation, the Brillouin diagram was used extensively to analyze performance characteristics generated by the k to ß relationship where ß was determined from the relative amplitude and phase of the near magnetic field created by the structure under various conditions. The far field radiation patterns were used to check the results of the Brillouin diagram and observe the presence of end and truncation effects. The results of this study show that the potential of designing a successful log-periodic antenna with half square elements and a dual feed system exist, but further research is needed to establish optimum scaling and gain. The research did verify the dual polarization property, and the possibility of generating high and low angle propagation modes with the use of a dual feed system on the structure.
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NPS Report NumberNPS 62-87-003
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