Jae-Suk Lee

Mobile Antenna Using Multi-Resonance Feed Structure for Wideband Operation

A multi-resonance feed structure for exciting a mobile handset antenna in order to achieve multiband operation is presented. The feed structure adjusts its impedance and controls the coupling with the antenna structure. Based on the proposed feed structure, the dimensions allowed for the antenna design are only 10 × 55 × 2 mm 3 while the measured impedance bandwidth is from 694 to 1003 MHz in the lower band and from 1656 to 2772 MHz in the higher band under a voltage standing wave ratio of 3:1 with good measured realized efficiency. The proposed antenna is a competitive candidate that fully covers most 4th generation (4G) and existing wireless communication services.

Agglomeration phenomena of high temperature coefficient of resistance platinum films deposited by electron beam evaporation

Abstracts are not published in this journal

Effects of deposition conditions on physical properties and stresses of Pt and (Al, Si)Ox thin films

Abstracts are not published in this journal

An ultra-wide impedance bandwidth mobile handset antenna using novel dual-resonance feed structure

An ultra-wide impedance bandwidth antenna is presented in this paper. To enhance an impedance bandwidth of antenna, a novel dual-resonance feed structure composed of two branch capacitors and inductors is combined with a conventional planar inverted-F antenna (PIFA). The antenna possesses a very wide impedance bandwidth which fully covers the band of various wireless communication services. The impedance bandwidth of proposed antenna is from 675 to 988 MHz in the lower band and from 1710 to 2695 MHz in the higher frequency band with good efficiency, respectively.