Summary
International Symposium on Antennas and Propagation
2009
Session Number:3D2
Session:
Number:3D2-5
Fundamental Characteristics of Compact Folded Dipole Antenna with a Space-saving
Masaya Hirayama, Jun Itou, Yongho Kim, Hisashi Morishita,
pp.1019-1022
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Recently the services (IMT-2000, Bluetooh, W-LAN, WiMAX, Digital TV Reception) for the cellular phone are increasing. So wider bandwidth antennas for handsets are required. In addition, built-in antennas become popular. In our previous paper [1] [2], in order to make a small size and lower profile of antenna for handsets, the built-in folded dipole antenna (BFDA) and built-in bent folded dipole antenna (BBFDA) have been introduced and analyzed. Those antennas can be built in a small volume and placed very close to the rectangular ground plane (GP), which represents a shielding plate used in the handset units, because they have a folded structure and high radiation resistance. In addition, a fold dipole antenna has the self-balanced effect, which means no balun is needed even if BFDA and BBFDA are fed by a coaxial cable [3]. In a result, the relative bandwidths of BFDA and BBFDA for VSWR?2 are approximately 39.3% and 35.6%, respectively. And the relative bandwidths of the balanced mode are approximately 23.0% and 20.1% In this paper, more compact folded dipole antenna (CFDA) based on BFDA is proposed and its characteristics are analyzed in both theoretically and experimentally.