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dc.contributor.authorKim, Jeong I.en_US
dc.date.accessioned2014-03-14T20:42:53Z
dc.date.available2014-03-14T20:42:53Z
dc.date.issued1999-07-27en_US
dc.identifier.otheretd-080699-180221en_US
dc.identifier.urihttp://hdl.handle.net/10919/34392
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_US
dc.publisherVirginia Techen_US
dc.relation.haspartETD_LPLA.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectLog-Periodic Loop Antennaen_US
dc.subjectLog-Periodic Dipole Antennaen_US
dc.subjectGround Reflectoren_US
dc.subjectESPen_US
dc.subjectFrequency Independent Antennaen_US
dc.titleLog-Periodic Loop Antennasen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairSafaai-Jazi, Ahmaden_US
dc.contributor.committeememberStutzman, Warren L.en_US
dc.contributor.committeememberPoon, Ting-Chungen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-080699-180221/en_US
dc.date.sdate1999-08-06en_US
dc.date.rdate2000-08-13
dc.date.adate1999-08-13en_US


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