Abstract
This study focuses on the user influence on a MIMO antenna system in a smart phone form factor. The antenna system is designed to have a low coupling and correlation between its two antennas. The study is based on time-domain simulations of the antenna system in free space and with a head and hand
phantom using a commercially available Finite Element Method solver. The MIMO parameters are evaluated with three different channel models.
A static grip only gives one case of the user effect so the hand phantom is modified with a moving finger that is swept across the backplane of the phone. Based on the results of the study it is concluded that the placement of the index finger has a significant effect on the simulated antenna system. For certain
finger placements the mismatch loss and absorption loss both change more than 5 dB.
Overall the antenna system shows good MIMO performance in
free space but suffers under the influence of the user. Especially the diversity antenna is heavily detuned and gives a total efficiency of -19.1 dB worst case compared to -1.9 dB in free space. The branch power ratio is increased by the user while the envelope correlation is decreased by the user.
phantom using a commercially available Finite Element Method solver. The MIMO parameters are evaluated with three different channel models.
A static grip only gives one case of the user effect so the hand phantom is modified with a moving finger that is swept across the backplane of the phone. Based on the results of the study it is concluded that the placement of the index finger has a significant effect on the simulated antenna system. For certain
finger placements the mismatch loss and absorption loss both change more than 5 dB.
Overall the antenna system shows good MIMO performance in
free space but suffers under the influence of the user. Especially the diversity antenna is heavily detuned and gives a total efficiency of -19.1 dB worst case compared to -1.9 dB in free space. The branch power ratio is increased by the user while the envelope correlation is decreased by the user.
| Original language | English |
|---|---|
| Title of host publication | Antennas and Propagation (EuCAP), 2014 8th European Conference on |
| Number of pages | 4 |
| Publisher | IEEE |
| Publication date | 2014 |
| Pages | 2006-2009 |
| DOIs | |
| Publication status | Published - 2014 |
| Event | 2014 8th European Conference on Antennas and Propagation - World Forum, Haag, Netherlands Duration: 6 Apr 2014 → 11 Apr 2014 Conference number: 32451 |
Conference
| Conference | 2014 8th European Conference on Antennas and Propagation |
|---|---|
| Number | 32451 |
| Location | World Forum |
| Country/Territory | Netherlands |
| City | Haag |
| Period | 06/04/2014 → 11/04/2014 |