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A dual band PIFA antenna with EBG structure in application to wearable communication system is investigated in this article. The proposed antenna is designed to work at 2.4/5.8 GHz WLAN band by two horizontal radiation units, and then the dual band EBG with two rectangular rings is designed, which is quite a simple structure. The two zero-reflection phases and band-gaps of S 21 <220 dB are observed in the designed working bands. Both of the measurement and simulation show that the performance of the proposed antenna under bending condition is stable, and by virtue of the EBG structures, several significant characteristics are obtained such as the unidirectional radiation, high gain, and low SAR value, which are necessary for WBAN applications. K E Y W O R D S bending performance, EBG structure, PIFA, SAR, wearable antenna

In this paper, an ultra‐wideband (UWB) antenna with reconfigurable performance is proposed. The antenna consists of a U‐shaped radiation patch and a ground plane which is symmetric with the edge of the radiation patch. By using two open‐ended L‐shaped slots (OEL‐S) and one U‐shaped slot Defected Ground Structure, the dual notched bands at 3.5 GHz for WiMAX and 5.5 GHz for WLAN are obtained. Three switches are embedded in both L‐shaped and U‐shaped slots in order to achieve four switchable modes by switching them between ON and OFF states. There are three modes that the antenna can be switched in, which are dual, single and no band‐notched modes. The measured result illustrates that the operation frequency band is from 2.7 GHz to 12 GHz (VSWR < 2). Moreover, the conceptual circuit model and time‐domain characteristics of the antenna are also proposed to investigate the dual band‐notched performance. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1326–1332, 2017