Accession Number : ADA255175


Title :   Design and Evaluation of Portable Antennas for Location of Sources of Radio Noise Emanating from Power-Line Hardware


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Lazaris, Dimitrios T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255175.pdf


Report Date : Jun 1992


Pagination or Media Count : 146


Abstract : Power-line noise (PLN) is a major contribution to factors which cause the loss of signals at naval receiving sites. Navy Signal-to-Noise Enhancement Program (SNEP) teams have developed portable instrumentation for the location of RF noise-producing power-line hardware. An important component of this instrumentation is a lightweight antenna with modest directivity and wide bandwidth (60-800 MHz). The purpose of this study is the design, construction, analysis and measurement of three customized Log-Periodic Dipole Arrays (LPDA) for use in locating PLN sources. Modifications to standard LPDA designs include a feeder boom with convenient construction features and emphasis on a compact, lightweight, portable structure. The Numerical Electromagnetic Code (NEC) was used to analyze the performance of the various designs. Input impedances were measured in operational environments using network analyzers. The final designs were field-tested at a U.S. Naval site in Okinawa and found to be completely acceptable for SNEP use.


Descriptors :   *SIGNAL TO NOISE RATIO , *DIPOLE ANTENNAS , *NOISE ANALYZERS , *ELECTRIC POWER TRANSMISSION , INPUT , MEASUREMENT , ENVIRONMENTS , NETWORKS , AUGMENTATION , THESES , CONSTRUCTION , ANTENNAS , OKINAWA , BANDWIDTH , ANALYZERS , NOISE , POWER , INSTRUMENTATION , LIGHTWEIGHT , STANDARDS , DIPOLES , SIGNALS , ABSTRACTS , ARRAYS , MODIFICATION , NAVY , SITES , STRUCTURES


Subject Categories : Electric Power Production and Distribution
      Cybernetics
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE