A novel compact ultra‐wide band antenna with L‐shaped slot is presented. The printed antenna is fed by a microstrip feed line to achieve impedance matching for the SMA connector. The proposed antenna offers 118% bandwidth when printed on a substrate of dielectric constant 4.4 and has an overall dimension of 23.7 × 23.7 × 0.8 mm3. The simulated and measured reflection characteristics of the antenna with the variation of key‐parameters along with radiation patterns of the final antenna are presented and discussed. In addition, by decreasing the dimension of radiating patch, band‐notched properties in the lower wireless local area network (WLAN) (5.15–5.35 GHz) or higher WLAN (5.725–5.825 GHz) bands are achieved. With the compact size and broadband, this antenna is very suitable for using in a trade‐off which has to be taken account for a design of miniaturisation.

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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Due to the low price, high efficiency and flexible manipulations, the metasurface has attracted more attentions. This paper proposes a new 1-bit configurable reflection array antenna with 11*11 unit cells. The unit cell in the metasurface, which is integrated with one PIN diode, shaped as ‘ancient coin’ can generate reflection phases between 165°-195° (180°±15°). The new phase array antenna can realize flexible manipulations to EM (electromagnetic) waves.