Author :
Nascimento, D.C. ; Schildberg, R. ; da S.Lacava, J.C.
Abstract :
The Yagi-Uda antenna - invented in 1926 by H. Yagi and S. Uda at Tohoku University [1] in Japan, but first published in English only in 1928 [2] - has been extensively used as an end-fire antenna since then. Instead of the cylindrical antenna elements from the original work, radiators of small overall dimensions are presently achieved by means of other topologies, such as printed dipoles. Recently, a novel uniplanar quasi-Yagi design, combining both the compactness of resonant-type antennas and the broadband characteristics of traveling-wave radiators, was presented [3-4]. A current potential application of Yagi-Uda antennas is in GPRS (General Packet Radio Service), a packet-based data service over the existing GSM network. In general, the operation of mobile terminals requires antennas with omnidirectional radiation patterns; however, in case the mobile terminal is far removed from the base station, a directional antenna must be used [5]. In this paper, a new Yagi-Uda antenna topology, made up of printed monopoles, is proposed. The goal is achieving a compact, low cost, efficient radiator for GPRS applications.
Keywords :
Yagi antenna arrays; microstrip antenna arrays; monopole antenna arrays; packet radio networks; GPRS; GSM network; Yagi-Uda monopole array; directional antenna; mobile terminals; omnidirectional radiation patterns;; packet-based data service; printed monopoles; resonant-type antennas; traveling-wave radiators; Broadband antennas; Dipole antennas; Directive antennas; GSM; Ground penetrating radar; Mobile antennas; Network topology; Packet radio networks; Resonance; Yagi-Uda antennas;