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A Study on Antenna with Characteristics of Insensitive to Metal for Installation in Proximity to Two Metal Walls

In order to achieve a near-metal-insensitive antenna for closed space wireless communications, the impedance characteristics of folded monopole antennas (FMA) are of intense interest. The characteristics of a near-metal-insensitive antenna are basically not influenced by proximate objects, especially metal. This paper investigates the antenna characteristics when the antenna approaches metal plates in multiple directions to replicate an actual use environment. The results allow us to develop a higher impedance model that yields greater antenna performance than the conventional middle impedance model.