Abstract
Ultrawideband (UWB) antennas, as core devices in high-speed wireless communication, are widely applied to mobile handsets, wireless sensor networks, and Internet of Things (IoT). A compact printed monopole antenna for UWB applications with triple band-notched characteristics is proposed in this paper. The antenna has a very compact size of 10 × 16 mm2 and is composed of a square slotted radiation patch and a narrow rectangular ground plane on the back of the substrate. First, by etching a pair of inverted T-shaped slots at the bottom of the radiation patch, one notched band at 5–6 GHz for rejecting the Wireless Local Area Network (WLAN) is generated. Then, by cutting a comb-shaped slot on the top of the radiation patch, a second notched band for rejecting 3.5 GHz Worldwide Interoperability for Microwave Access (WiMAX) is obtained. Further, by cutting a pair of rectangular slots and a C-shaped slot as well as adding a pair of small square parasitic patches at the center of the radiating patch, two separate notched bands for rejecting 5.2 GHz lower WLAN and 5.8 GHz upper WLAN are realized, respectively. Additionally, by integrating the slotted radiation patch with the narrow rectangular ground plane, an enhanced impedance bandwidth can be achieved, especially at the higher band. The antenna consists of linear symmetrical sections only and is easy for fabrication and fine-tuning. The measured results show that the designed antenna provides a wide impedance bandwidth of 150% from 2.12 to 14.80 GHz for VSWR < 2, except for three notched bands of 3.36–4.16, 4.92–5.36, and 5.68–6.0 GHz. Additionally, the antenna exhibits nearly omnidirectional radiation characteristics, low gain at the stopbands, and flat group delay over the whole UWB except at the stopbands. Simulated and experimental results show that the proposed antenna can provide good frequency-domain and time-domain performances at desired UWB frequencies and be an attractive candidate for portable IoT applications.
Highlights
Since the Federal Communication Commission (FCC) allowed its commercial ultrawideband (UWB) systems to work from 3.1 GHz to 10.6 GHz in 2002 [1,2], UWB technology has attracted much attention because of broad bandwidth, good radiation characteristics, high speed data rate, and so on [3,4]
UWB antennas have found their niche in applications involving high or low data rate transmission over short ranges [5], surveillance systems [6], medical applications [7,8], wireless body area network (WBAN) [9], and Internet of Things (IoT) [10]
Access (WiMAX) systems operating at 3.3–3.7 GHz and Wireless Local Area Network (WLAN) systems operating at 5.15–5.35 GHz and 5.725–5.825 GHz [14]
Summary
Since the Federal Communication Commission (FCC) allowed its commercial ultrawideband (UWB) systems to work from 3.1 GHz to 10.6 GHz in 2002 [1,2], UWB technology has attracted much attention because of broad bandwidth, good radiation characteristics, high speed data rate, and so on [3,4]. UWB antennas have found their niche in applications involving high or low data rate transmission over short ranges [5], surveillance systems [6], medical applications [7,8], wireless body area network (WBAN) [9], and Internet of Things (IoT) [10]. In order to avoid potential interferences from narrow communication systems, it is desirable to design miniaturized UWB antenna with intrinsic band-notched characteristics at those narrow bands [15]. In order to avoid the interference from both the WiMAX (3.3–3.69 GHz) and WLAN (5.15–5.825 GHz) bands, dual band-notched UWB antennas were presented in [18,19,20] and [25,26,27,28,29]
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