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A simple and compact U‐shaped antenna with an ultrawideband characteristic is presented. The proposed antenna consists of a modified radiation patch fed by a microstrip line and a slot on the ground plane. In order to improve impedance matching at a lower band, the narrow strip is inserted at the center of the patch, and the ground plane is optimized with the inverted T‐shaped slot. Its performance is demonstrated from S‐parameters and radiation patterns. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2265–2269, 2014

In this paper, a novel foldable multifunctional planar antenna array is proposed. It provides two modes; diversity and directivity modes. Each mode is switched by folding and unfolding the proposed antenna array. For the diversity mode, four antenna elements are placed for MIMO applications. When the antenna array is folded, its function is changed to the directivity mode and it works as a planar YagiUda antenna. The simulation and measurement results are shown in order to demonstrate two modes are properly working at 2.4 GHz.Index Terms -Foldable antenna, diversity, directivity, planar yagi-uda antenna.

In this paper, a novel diversity and directivity mode-switchable planar antenna array is proposed. For the diversity mode, four elements are unfolded on the plane and high isolation can be achieved. On the other hand, the antenna function is changed to the directivity mode when they are folded and stacked. Each element works such as a stacked Yagi-Uda antenna with high directivity. Especially, the curved feed line as well as the hybrid feeding method is used to improve performances. The simulation results agree well with measurement results and it is successfully demonstrated that two modes are properly working at 2.4 GHz.

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