Multi-resonance characteristic of the L-shaped Folded Monopole Antenna using parasitic elements

The latest trend in handset unit used in the cellular phone is to reduce the size and the weight. Antennas used for such handsets must also follow downsizing of the handset unit and yet keep the antenna performance unchanged or even improved. Furthermore, built-in antennas for handset are becoming normal. There is the Folded Monopole Antenna which is half-space than The Folded Dipole Antenna (FDA) has already been being studied for downsizing [1][2][3][4]. This antenna bended into L-shape is called the L-shaped Folded Monopole Antenna (LFMA). In this paper, multi resonance of the LFMA using a parasitic element is investigated.

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[2]  H. Morishita,et al.  Characteristics of L-shaped built-in folded monopole antenna for handsets , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[3]  Hisashi Morishita,et al.  Compact Built-In Handset MIMO Antenna Using L-Shaped Folded Monopole Antennas , 2008, IEICE Trans. Commun..

[4]  T. Tanaka,et al.  Built-in half size of folded dipole antenna for handsets , 2004, IEEE Antennas and Propagation Society Symposium, 2004..