• A circular patch frequency reconfigurable antenna for wearable applications

      Farooq, Waqas; Ur-Rehman, Masood; Abbasi, Qammer Hussain; Qaraqe, Khalid; University of Bedfordshire; Texas A & M University at Qatar (Institute of Electrical and Electronics Engineers Inc., 2015-12-07)
      A novel frequency reconfigurable microstrip patch antenna has been presented for 3.6 GHz and 5 GHz. Compared to the traditional, complicated and high cost frequency reconfigurable antennas, our work is featured by a simple and concise design. The frequency reconfiguration is obtained by using layers of mercury and liquid crystal polymer (LCP) on conventional patch antenna. The proposed structure was modelled and simulated using CST Microwave Studio. The antenna was first simulated in free space to check the antenna parameters such as return loss, gain, radiation pattern and efficiency. After obtaining the results, the antenna was simulated for analysing the on-body performance by using numerical model of human body. The simulated return loss for both the configurations is less than -10 dB at the radiating frequencies. The free space simulated results show the close agreement with the on-body test results.
    • Design of band-notched ultra wideband antenna for indoor and wearable wireless communications

      Ur-Rehman, Masood; Abbasi, Qammer Hussain; Akram, Muhammad; Parini, Clive G.; University of Bedfordshire; Texas A & M University at Qatar; University of Engineering and Technology, Pakistan; Queen Mary University of London (Institution of Engineering and Technology, 2014-10-16)
      Design of a tapered-slot ultra wideband (UWB) band-notched wearable antenna is presented in this study. The antenna operation covers the whole UWB frequency spectrum of 7.5 GHz ranging from 3.1 to 10.6 GHz, while rejecting the wireless local area network operation at 5.25 GHz band. The performance of the antenna is analysed through simulations and validated through measurements. The antenna makes use of ultra-thin liquid crystal polymer (LCP) substrate. The presented return loss and radiation pattern results show that the antenna offers excellent performance in the UWB frequency band in free space. Use of the LCP substrate makes the antenna to efficiently mitigate the bending effects. Moreover, the antenna performs well in on-body configurations and its working is little affected in adversely hot and humid weather conditions. Furthermore, it offers good on-body communication link and pulse fidelity. These features make the proposed antenna design a well-suited choice for hand-held and wearable UWB applications.
    • The road ahead for body-centric wireless communication and networks

      Ur-Rehman, Masood; Abbasi, Qammer Hussain; Alomainy, Akram; University of Bedfordshire; Texas A & M University at Qatar; University of Engineering and Technology, Pakistan; Queen Mary University of London (Institution of Engineering and Technology, 2015-02-26)
      Wireless interaction of the human user with the computing devices has seen a profound growth in the past decade. Wearable technology has successfully moved past the adoption stage and now stands at the brink of massive diversification with an explosion in popularity and applicability. The estimated market value of the wearable technology is expected to hit $32 billion mark by 2020 [1, 2]. It would cause the global wearable devices market it to grow from 20 million device shipments in 2015 to 187.2 million units annually by 2020 [3].
    • Study of a novel multi-band antenna for body-centric wireless networks

      Farooq, Waqas; Ur-Rehman, Masood; Yang, Xiaodong; Abbasi, Qammer Hussain; University of Bedfordshire; Xidian University; Texas A & M University at Qatar (Institute of Electrical and Electronics Engineers Inc., 2015-12-07)
      Body-centric wireless networks are used for connectivity between on-body and on-off body communications for various applications for rescue, diagnostics and medical usage. Multiple features of modern portable and wearable devices necessitate antenna operation at a number of frequencies. A compact, low profile and multi-band antenna is presented for body-centric wireless networks in this study. The conventional microstrip rectangular patch antenna has been converted into a multi-band antenna by using layers of mercury and liquid crystal polymer (LCP). The antenna performance in free space and in body-mounted configurations are evaluated and compared using computer simulations. The proposed antenna supports six frequencies for operation at ISM/Wi-Fi/C band. A minimal shift in the operating frequencies while operating in on-body configuration makes this the proposed antenna very resilient to frequency de-tuning caused by the human body presence. The antenna also offers high peak gain values (>7.68 dBi) in the two configurations at all of the operating frequencies.