LOG-PERIODIC FOLDED MONOPOLE ARRAY
Technical rept. no. 4
ILLINOIS UNIV AT URBANA ENGINEERING EXPERIMENT STATION
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This technical note describes and gives the results of a limited investigation of a type of undirectional, vertically polarized, log-periodic antenna referred to as a log-periodic folded monopole array. The objective of the study was to learn enough about the new structure so that a comparison of its performance could be made with the other possible array elements, namely the zigzag and coaxial fed monopole array antennas. From the impedance data, it appears that the impedance characteristics of this type structure are not naturally good, and that a more careful investigation would have to be conducted to determine if there were any modifications which would improve its performance. It was decided that since this type structure offered no great advantage over the zigzag or coaxial fed monopole array it would not be worthwhile going into an investigation in an attempt to improve its impedance performance at this time. It is interesting to note that this structure represents the first time, to the authors knowledge, that a folded monopole has been incorporated in the design of a log-periodic structure. Since this structure was conceived several other investigators have had varying degrees of success using folded monopoles or dipoles in the design of log-periodic structures.
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