The Use of Coaxial Transmission Line Elements in Log-Periodic Dipole Arrays
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis examines the feasibility of designing a log-periodic dipole array LPDA with coaxial transmission line elements and comparing the resulting operational bandwidth with that of a conventional LPDA. Using the Numerical Electromagnetics Code NEC, a coaxial dipole was modeled to optimize the bandwidth and then used as the element in a variety of uniform arrays. Different types of element connections were examined including switched series, switched parallel, and unswitched parallel. The results of NEC for each of the arrays are plotted as K-BETA diagrams to compare to the standard arrays. The results of the investigation show that the Snyder dipole provides more operational bandwidth than a standard dipole, but when placed in a uniform array there is no more bandwidth than that of a conventional uniform array.
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