2017 Volume 6 Issue 11 Pages 621-626
In order to obtain near-metal-insensitive antenna for closed-space wireless communications, the impedance characteristics of U-shaped folded monopole antenna is investigated in detail. In this Letter, the near-metal-insensitive means antenna VSWRs are hardly influenced by the near object, especially metal. The simulated and measured results show that the proposed higher impedance model has stronger near-metal-insensitiveness than the conventional middle impedance model. The simulated and measured results show that the antenna gains of higher impedance models are 3 dB greater at maximum than those of middle impedance models, when metal plane approaches.
