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Log-Periodic Loop Antennas

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dc.contributor.authorKim, Jeong I.en
dc.contributor.committeechairSafaai-Jazi, Ahmaden
dc.contributor.committeememberStutzman, Warren L.en
dc.contributor.committeememberPoon, Ting-Chungen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:42:53Zen
dc.date.adate1999-08-13en
dc.date.available2014-03-14T20:42:53Zen
dc.date.issued1999-07-27en
dc.date.rdate2000-08-13en
dc.date.sdate1999-08-06en
dc.description.abstractThe Log-Periodic Loop Antenna with Ground Reflector (LPLA-GR) is investigated as a new type of antenna, which provides wide bandwidth, broad beamwidth, and high gain. This antenna has smaller transverse dimensions (by a factor of 2/pi) than a log-periodic dipole antenna with comparable radiation characteristics. Several geometries with different parameters are analyzed numerically using ESP code, which is based on the method of moments. A LPLA-GR with 6 turns and a cone angle of 30* offers the most promising radiation characteristics. This antenna yields 47.6 % gain bandwidth and 12 dB gain according to the numerical analysis. The LPLA-GR also provides linear polarization and unidirectional patterns. Three prototype antennas were constructed and measured in the Virginia Tech Antenna Laboratory. Far-field patterns and input impedance were measured over a wide range of frequencies. The measured results agree well with the calculated results. Because of its wide bandwidth, high gain, and small size, the LPLA is expected to find applications as feeds for reflector antennas, as detectors in EMC scattering range, and as mobile communication antennas.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-080699-180221en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-080699-180221/en
dc.identifier.urihttp://hdl.handle.net/10919/34392en
dc.publisherVirginia Techen
dc.relation.haspartETD_LPLA.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectLog-Periodic Loop Antennaen
dc.subjectLog-Periodic Dipole Antennaen
dc.subjectGround Reflectoren
dc.subjectESPen
dc.subjectFrequency Independent Antennaen
dc.titleLog-Periodic Loop Antennasen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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