A study on metal-insensitive antenna for closed space wireless communications

In order to obtain metal-insensitive antenna for closed-space wireless communications, the impedance characteristics of U-shaped folded monopole antenna is investigated in detail. The simulated and measured results show that the proposed higher impedance model has stronger metal-insensitiveness than the conventional middle impedance model. The simulated results show that the antenna gains of higher impedance models are 3dB greater than those of middle impedance models.