Abstract
In this paper, an UWB-MIMO antenna with frequency selective surface (FSS) decoupling structure is proposed. To realize antenna system miniaturization and integration, silicon material is applied as substrate. The proposed antenna becomes a very compact construction with dimension of 38.2 × 26.6 × 0.4 mm3. The proposed broadband FSS unit consists of four split rectangles and one I-shaped strip. The effective permittivity or effective permeability of FSS unit is negative, so the FSS is a metamaterial structure and has a broadband frequency band gap in the entire UWB range. Six FSS units are positioned in the middle of antenna backside, like band-stop filter to reduce the coupling between the antennas placed side-by-side. Compared to UWB-MIMO antenna without FSS, the proposed array not only keeps each antenna performance but also decreases 7.2 dB coupling. The UWB-MIMO with FSS structure provides an overall isolation of more than 16 dB in the UWB spectrum, so it is suitable for portable UWB-MIMO system applications.
Highlights
The ultra-wideband (UWB) system is a radio engineering technology with frequency from 3.1–10.6 GHz [1], which has several advantages including very large bandwidth, low power consumption, high date rate, high time resolution, resistance to interference, co-existence with narrowband systems, and so on
After adding six metamaterial frequency selective surface (FSS) units on the rear of MIMO antenna, S21 decreases over the entire UWB range, but coupling coefficient is still above −15 dB between 9.42 GHz and 10 GHz
It is demonstrated that the decoupling structure keeps good impedance matching performance and improves isolation of antennas I and II
Summary
The ultra-wideband (UWB) system is a radio engineering technology with frequency from 3.1–10.6 GHz [1], which has several advantages including very large bandwidth, low power consumption, high date rate, high time resolution, resistance to interference, co-existence with narrowband systems, and so on. Such advantages enable UWB technology widely applied in communication, radar, imaging, and positioning [2–5]. The broadband FSS cell is composed of electric resonator and magnetic resonator with the band gap characteristic as same as metamaterial This UWBMIMO antenna with FSS structure obtains more than 16 dB isolation between antennas in the UWB frequency band.
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