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A pattern reconfigurable Yagi-Uda antenna based on liquid metal is presented. The antenna consists of a balun-fed active dipole and a pair of stretchable passive parasitic dipoles, which are implemented by EGaIn alloy embedded in microfluidic channels. The parasitic dipoles are driven at each end by two low-cost, 3-D printed media rods. Afterwards, spinning the rods at different angles leads to varying degrees of stretching upon the stretchable dipoles. Note the length of passive parasitic dipoles is a vital factor for antenna radiation reconfiguration. The antenna exhibits bidirectional radiation if the parasitic dipoles are equal in length. Otherwise, directional radiation towards the shorter parasitic dipole direction can be obtained. Based on the above-mentioned working principle, a pattern reconfigurable antenna working in WLAN band is fabricated and measured. Apart from the reconfigurable capability, the proposed antenna keeps operating in the WLAN band of 2.4 -2.48 GHz during the whole shape deformation.

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Abstract-A novel inductively loaded monopole for future ultra-wideband (UWB) applications is presented. The antenna is compact and of small size (16 mm × 20 mm × 0.8 mm), and offer a very simple geometry suitable for low cost fabrication and straight forward printed circuit board integration. More specifically, the impedance matching of the classic printed inductively loaded monopole is improved by employment of the tapered microstrip feed line between K-connector and the printed monopole. By using this technique, impedance bandwidth (S 11 < −10 dB) from 3.03 GHz to over 40 GHz is obtained. Measured and simulated return loss curves are provided along with radiation patterns and gains, as a function of frequency. Compared to the recently reported UWB antennas, the presented antenna have smallest size, widest bandwidth, and simple configuration to realize the application in UWB communication systems. Furthermore, symmetric radiation patterns and satisfactory gains make the presented antenna a suitable candidate for practical UWB applications.

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