Title :
Multi-band Printed Monopole Antenna for Ubiquitous Module in Mobile Station
Author :
Kimura, Yuichi ; Ebine, Y. ; Imai, Tetsuro
Author_Institution :
Dept. of Radio Access Network Dev., NTT DoCoMo, Inc., Yokosuka
Abstract :
Current mobile communication systems in W-CDMA systems are assigned three frequency bands in Japan. We present and investigate a multi-resonant printed monopole antenna (80times120times1.6 mm3) for a small wireless packet communication module (called a ubiquitous communication module). The proposed monopole antenna uses a small ground plane (0.2 lambda of the lowest frequency) to achieve miniaturization. This paper proposes employing impedance matching (V.S.W.R. (voltage standing-wave ratio) < 1.8) to avoid the influence on incurred from a coaxial feed cable by using a microstrip feed line with a balun, impedance converter, and step- impedance. Furthermore, calculation and measurement results confirm that the radiation patterns are roughly omnidirectional in the phi plane in W-CDMA systems.
Keywords :
code division multiple access; impedance matching; microstrip antennas; mobile communication; monopole antennas; multifrequency antennas; W-CDMA systems; balun; coaxial feed cable; impedance converter; impedance matching; microstrip feed line; mobile communication systems; mobile station; multiband printed monopole antenna; multiresonant printed monopole antenna; step impedance; ubiquitous communication; ubiquitous module; voltage standing-wave ratio; wireless packet communication; Microstrip feed line; Multi-resonant; Printed monopole; V.S.W.R.;
Conference_Titel :
Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on
Print_ISBN :
978-0-86341-842-6
