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A wide band monopole antenna that works at Ultrahigh frequency (UHF) clustered with two wide band dipole antennas that work at L and S band are proposed in this paper. The three antennas are in the cover of a handset device which connects to the ground plane on its main body with a wire. The UHF monopole antenna covers the frequency band from 350 MHz to 780 MHz with VSWR lower than 3 in a total length of 0.16λ0 with omnidirectional gain upon 0 dBi which is used for self-networking communication. The L band dipole antenna shares part of the ground plane with the UHF monopole antenna, which works from 1.23 GHz to 1.62 GHz, with the end fire gain upon 6 dBi. The S band dipole antenna covers from 1.7 GHz to 2.34 GHz with gain upon 6 dBi. The three antennas have good isolation higher than 15 dB. The simulation indicates that the proposed clustered antennas have small volume, stable radiation pattern and wide band.

A Wide Band Compact Size UHF Band Monopole Clustered with L and S Band Dipoles for Self-networking Communication in Handset Devices