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We investigate the use of miniaturised metallodielectric electromagnetic bandgap (MEBG) structures embedded in the case of a mobile handset as a means of decoupling the antenna from the user's hand. The closely coupled MEBG concept is employed to achieve miniaturisation of the order of 15:1. The performance of a prototype handset with an embedded conformal MEBG is assessed experimentally and compared to a similar prototype without the MEBG. Reduction in the de-tuning of the antenna due to the human hand by virtue of the MEBG is demonstrated. Moreover the efficiency of the handset when loaded with a human hand model is shown to improve when the MEBG is in place. The improvements are attributed to the de-coupling of the antenna from the user's hand, which is achieved by means of suppressing the fields in the locality of the hand.
Antennas and Propagation Society International Symposium, 2005 IEEE (Volume:2A )
Date of Conference: 3-8 July 2005