We have been developing a 2.4 GHz point-to-multipoint wireless communication system suitable for use inside mechatronics ICT (Information and Communication Technology) equipment to replace wire harnesses inside equipment with wireless communication as a useful technique of weight reduction and simplification of system assembling [1]. One of the critical problems of such applications is that antennas are installed close to metallic components or in a narrow gap between metallic housings and thus suffer degradation of antenna performance due to effects of the ambient environment. Therefore, in order to maintain desired antenna performance inside equipment, we need to understand the dependence of antenna characteristics on the ambient environment inside equipment and design antennas with a consideration of it.
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