Fractal-Inspired Ultra-Wideband Diversity Slot Antenna for Wireless Communication Systems

Contemporary Developments in High-Frequency Photonic Devices Pub Date : 1900-01-01 DOI:10.4018/978-1-5225-8531-2.CH005

A. Karmakar, Anuradha Saha

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Abstract

A novel compact ultra-wideband (UWB) multiple-input multiple-output (MIMO) slot antenna with band notch characteristics is presented for portable wireless UWB applications. The antenna comprises of co-planar waveguide feed (CPW) and two radiating monopoles oriented in orthogonal orientation for providing orthogonal radiation patterns. A Minkowski fractal parasitic stub along with a Minkowski fractal grounded stub has been placed at 45° between the monopoles to reduce the coupling between them, which in turn establishes high isolation between the radiators. An excellent band notch characteristic is obtained at 5.5 GHz by etching a modified E-shaped compact slot on the radiators. Results show that the designed antenna meets -10 dB impedance bandwidth and -17 dB isolation throughout the entire operating band (3.1 -12 GHz). Novelty of this design lies in improving isolation using fractal which occupies less space in compared to other isolation mechanisms in MIMO structures. The simulated and measured results depict that the proposed antenna is convenient for MIMO diversity systems.

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无线通信系统中分形启发的超宽带分集槽天线

针对便携式无线超宽带应用，提出了一种具有带陷波特性的新型紧凑型超宽带多输入多输出(MIMO)缝隙天线。该天线包括共面波导馈电(CPW)和两个以正交方向定向的辐射单极子，以提供正交辐射图。一个闵可夫斯基分形寄生短段和一个闵可夫斯基分形接地短段被放置在单极子之间的45°处，以减少它们之间的耦合，从而在散热器之间建立高度隔离。通过在散热器上蚀刻改进的e形紧凑槽，在5.5 GHz波段获得了良好的带缺口特性。结果表明，所设计的天线在整个工作频段(3.1 -12 GHz)内满足-10 dB阻抗带宽和-17 dB隔离度。该设计的新颖之处在于，与MIMO结构中的其他隔离机制相比，分形结构占用的空间更小，从而提高了隔离性能。仿真和实测结果表明，该天线适用于MIMO分集系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Contemporary Developments in High-Frequency Photonic Devices

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