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A multiple-input–multiple-output (MIMO) antenna with high frequency selectivity and controllable bandwidth, is proposed for band-notched ultrawideband (UWB) applications. In other words, it has a bandstop-filter-like response (second-order notched band) at the aimed rejected band. It consists of two rectangular printed monopole (PM) elements and a simple stepped ground stub to enhance wideband isolation. For achieving the second-order rejected band of the IEEE 802.11 wireless local area network (WLAN) band from 5.15 to 5.85 GHz centered at 5.5 GHz, two parasitic modified split-ring resonators (PMSRRs) and two inverted L-shaped branches (ILBs), are utilized. Measured results prove a bandwidth of S11

This paper presents a compact multiple-input-multiple-output (MIMO) antenna for wireless portable device applications. It entirely covers the Bluetooth (2.4–2.484 GHz), Worldwide Interoperability for Microwave Access (WiMAX) (3.4–3.69 GHz), Wireless Local Area Network (WLAN) (5.15–5.825 GHz), and ultra-wideband (UWB) (3.1–10.6 GHz) operating bands. This antenna consists of two planar polygon printed monopole(PM) antennas, a rectangular slot and a triangular trim on the antenna element to lower down the low-cutoff frequency for improving the impedance matching, and a stepped ground stub to improve the isolation. Two rounded corners are simultaneously used on the ground for the impedance matching at medium-high frequency. The results of simulation and measurement prove that the −10 dB bandwidth of this antenna is from 2.4 to 11 GHz, and the isolation is less than −15 dB in the entire band, which can satisfy the actual requirements according to most literatures. The envelope correlation coefficient is less than 0.02. The size of this antenna array is 40 × 36 mm2. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:783–787, 2016

A novel eight-band handset antenna with 10 × 60mm2 is proposed in this article which covers LTE700/2300/2500 and GSM850/900/1800/1900/UMTS2100. The developed antenna consists of six branches, and a notch is cut from the printed circuit board. The folded stripe has been adopted in the structure, which improves the performs of the antenna notably. The process of the design work has been presented step by step. A prototype of the proposed antenna is fabricated. The tested results including efficiency, and gain.

In this paper, a compact dual-resonator loaded ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna, which has a bandstop-filter-like response (second-order rejection band) with high frequency selectivity and controllable bandwidth at the aimed notched band, is proposed. The MIMO antenna consists of two rectangular printed monopole (PM) elements and a simple stepped ground stub to enhance wideband isolation. Compared with the traditional first-order band-rejected UWB MIMO antenna, the selectivity and bandwidth-controllability of the rejected band is greatly improved and its size is dramatically decreased to 32×26×0.8mm3 on a cost-effective FR4 substrate. The results of simulation and measurement prove a bandwidth of S 11 12 < −15 dB at 3 GHz–12 GHz excluding the rejection band of 5 GHz–5.95 GHz. Hence, it is a good candidate for wireless portable UWB MIMO applications.

This paper presents a small-size multiple-input-multiple-output (MIMO) antenna for wireless portable device applications. It entirely covers the Bluetooth (2.4–2.484 GHz), Worldwide Interoperability for Microwave Access (WiMAX) (3.4–3.69 GHz), Wireless Local Area Network (WLAN) (5.15–5.825 GHz) and ultra-wideband (UWB) (3.1–10.6 GHz) operating bands. This antenna consists of two planar polygon printed monopole (PM) antennas, a rectangular slot and a triangular trim on the antenna element to lower down the low-cutoff frequency for improving the impedance matching, and a stepped ground stub to improve the isolation. Two rounded corners are simultaneously used on the ground for the impedance matching at medium-high frequency. Simulated and measured results prove that the −10dB bandwidth of this antenna is from 2.4 to 11 GHz, and the isolation is less than −15dB in the entire band. Its size is only 40×36 mm2 on a cost-effective FR4 substrate.