Antenna diversity is a well-known technique to enhance the performance of wireless communication systems. In order to create an antenna diversity system on a wireless device, two or more antenna elements could be placed in positions. However, it is difficult to implement multiple antennas on handheld terminal. A compact planar inverted-L diversity antenna for handheld terminals is provided. Three diversity antennas operating at 2.15 GHz are designed. The isolation is found to be better than 13 dB and the usable bandwidth is about 13% in measurement. The measured radiation patterns are obtained that the proposed diversity antenna attains 2 dBi gain.
2. Karaboikis, M., C. Soras, G. Tsachtsiris, and V. Makios, "Compact dual-printed inverted-F antenna diversity systems for portable wireless devices," IEEE Antennas and Wireless Propagation Letters, Vol. 3, No. 1, 9-14, 2004.
3. Yeap, S. B., X. Chen, J. A. Dupuy, C. C. Chiau, and C. G. Parini, "Low profile diversity antenna for MIMO applications," Electronics Letters, Vol. 42, No. 2, 69-71, 2006.
4. Douglas, M. G., M. Okoniewski, and M. A. Stuchly, "A planar diversity antenna for handheld PCS devices," IEEE Transactions on Vehicular Technology, Vol. 47, No. 3, 747-754, 1998.
5. Nielsen, J. O. and G. F. Pedersen, "Mobile handset performance evaluation using radiation pattern measurements," IEEE Transactions on Antennas and Propagation, Vol. 54, No. 7, 2154-2165, 2006.