Summary
International Symposium on Antennas and Propagation
2008
Session Number:3C25
Session:
Number:3C25-3
Fundamental Characteristics of Planar Folded Dipole Antenna with a Feed Line
Takashi Yamano, Jun Itoh, Yongho Kim, Masaya Hirayama, Tsutomu Miyamoto, Hisashi Morishita,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Recently, the various services (IMT-2000, Bluetooth, W-LAN, WiMAX) for the cellular phone are widespread. Therefore, the broadband antenna for handsets is required. As one of the broadband antennas, the U-shaped Folded Dipole Antenna (UFDA) has already been introduced and its characteristics has been analyzed in the previous paper [1][2]. A Folded Dipole Antenna (FDA) can be placed close to the Ground Plane (GP) because it has a high radiation resistance. In addition, FDA has the self-balanced effect, which means the current on the GP can be effectively reduced, therefore, no balun is needed even if UFDA is fed by unbalanced feed line such as a coaxial cable. Furthermore, UFDA provides three resonance modes by considering the configuration of the feeding portion, and has broadband characteristics. The purpose of this study is to analyze the broadband characteristics of FDA by using the basic Planar Folded Dipole Antenna (PFDA) with a feed line and to introduce the new structure of the three-dimensional FDA which has broadband characteristics and is compact size.