An Overview of Ultra-Wide-Band Systems With MIMO

Abstract-A compact band-notched ultra-wideband (UWB) spatial diversity antenna is presented in this paper. The antenna is fabricated on an FR4 substrate and consists of two tapered microstrip feeding lines and two radiating elements. The wireless local area network (WLAN) for IEEE 802.11a operating in 5.15-5.825 GHz band-notched function is achieved by introducing two slits in the radiators as λ/4 resonators. The simulated and measured results show that the presented antenna has a broadband impedance bandwidth which covers UWB band and also has a band-notched characteristic. Additionally, the antenna has a good transmission coefficient better than −15 dB across the UWB. The radiation patterns, peak gain, and envelope correlation coefficient are measured and discussed.

Section: Introductionmentioning

confidence: 99%

A Compact Band-Notched Ultra-Wideband Spatial Diversity Antenna

Zhao¹,

Zhang²,

Zhang³

et al. 2014

“…Multiple-input-multiple-output (MIMO) technology is well known for overcoming the effects of multipath fading. Therefore, it is a sensible way to introduce MIMO technology in the UWB systems to improve channel capacity, and thus additional power requirements become not necessary [1,2]. When multiple antennas are applied in portable devices, the mutual coupling between the antenna elements will increase, and of course the MIMO antenna performance will deteriorate.…”

Section: Introductionmentioning

confidence: 99%

Compact 1×2 and 2×2 Mimo Antennas With Enhanced Isolation for Ultrawideband Application

Li¹,

Liu²,

Wang³

et al. 2017

Abstract-Two small size multiple-input-multiple-out (MIMO) antennas with high isolation for ultrawideband (UWB) applications are presented. A two-element MIMO antenna, which is mounted on an FR4 substrate with a compact size of 24 mm × 33 mm, consists of two symmetric circular monopole elements and a modified ground. The protruded ground provides a way to improve isolation and impedance matching. Such a wide band from 2.75 to 11 GHz is achieved by using modified ground technology, and high isolation more than 20 dB is also accomplished. Meanwhile, moderate gain and omnidirectional radiation patterns can be obtained. Based on the circular monopole with modified ground, a four-element antenna array is also constructed and studied. The size of the four-element antenna with orthogonal arrangement is 44 mm × 44 mm. Measured results show that the antenna also exhibits good impedance matching as well as low envelope correlation coefficient over the entire UWB spectrum.

“…Besides, a UWB system offers some other unique and distinctive properties, for instance, lower emission power, lower cost and more security [1], which make it more attractive than other short-range wireless communication technologies. In wireless local area networks and home audio/visual network applications such as high-speed high-definition television (HDTV) and audio/visual streams [2], people pay more attention to high-data-rate, near 1 GB/s transmission rate. In order to achieve the requirement, more advanced techniques are needed.…”

Section: Introductionmentioning

confidence: 99%

Very Compact 5.5 GHZ Band-Notched Uwb-Mimo Antennas With High Isolation

Liu¹,

Xi-liang²,

Zhang³

et al. 2017

Abstract-Two different types of band-notch UWB-MIMO antennas are proposed in this paper. The filtering effect can be achieved by integrating slot resonators to a UWB antenna. Both of the proposed antennas have very compact size and are smaller than most of the other band-notch UWB-MIMO antennas. The ultra-wideband is achieved by etching stepped slots on the ground. The band-notch characteristic can greatly reduce the potential interference between the UWB and WIMAX/WLAN system. Our proposed antennas can also possess a wide bandwidth from 3 GHz to 11 GHz with |S 11 | < −10 dB. Some effective measures have been taken and illustrated to reduce the isolation. Measurements demonstrate that the mutual coupling between the antenna elements is good enough for a MIMO system. Their stable radiation patterns are simulated, designed and measured successfully. The good performance and compact size make the antennas good candidates for UWB applications.