Design of a Novel Triple Band Monopole Antenna for WLAN/WiMAX MIMO Applications in the Laptop Computer

Jayshri Kulkarni,Deepak Ram Prasath Subburaj,Raju Seenivasan,V Abhaikumar

doi:10.1155/2019/7508705

Jayshri Kulkarni, Deepak Ram Prasath Subburaj + Show 2 more

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https://doi.org/10.1155/2019/7508705

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Abstract

This paper presents a triple band monopole antenna design with an overall size of 21 × 8 mm2 for WLAN/WiMAX Multiple Input and Multiple Output (MIMO) applications in the laptop computer. It comprises of three monopole radiating elements, along with two rectangular open-ended tuning stubs. This structure excites 2.4/5.2/5.8 GHz WLAN and 2.3/3.3/5.5 GHz WiMAX bands. The prototype testing of proposed antenna array formed by using the same antenna design shows that, it has measured -10dB impedance bandwidth of 11.86% (2.22-2.50 GHz) in a lower band (fl), 5% (3.25-3.42 GHz) in medium band (fm) and 16.84% (5.00-5.92 GHz) in upper band (fu). The measured gain and radiation efficiency are well above 3.65 dBi and 75%, respectively, throughout the operating bands. Also, the measured isolation between two antennas is better than -20dB and envelope correlation coefficient (ECC) is less than 0.004 across the three bands of interest. This confirms the applicability of the proposed antenna array for MIMO applications in the laptop computer.

Highlights

The Multiple Input and Multiple Output (MIMO) technology has aroused interest in WLAN and WiMAX operating systems because of its possible applications, security, high-speed data transmission, and efficient utilization of spectrum
The MIMO antenna composed of a loop structure and a parasitic element is proposed in [4] and has a size of 38 × 7 × 0.8mm3 along with an additional ground plane of size 38 × 6mm2 which is connected to the system ground
The MIMO antenna array in [5] uses a decoupling structure as an isolating element between two antennas for the laptop computer and occupies a large volume of 54 × 9 × 0.8mm3

Summary

Introduction

The MIMO technology has aroused interest in WLAN and WiMAX operating systems because of its possible applications, security, high-speed data transmission, and efficient utilization of spectrum. The MIMO antenna array in [5] uses a decoupling structure as an isolating element between two antennas for the laptop computer and occupies a large volume of 54 × 9 × 0.8mm. The MIMO antenna array in [5] uses a decoupling structure as an isolating element between two antennas for the laptop computer and occupies a large volume of 54 × 9 × 0.8mm3 It is placed at the center of the system ground, which is generally reserved for embedding the digital camera lens. The standalone monopole antenna used for MIMO array without any isolation element operates at 2.4/3.5/5.5 GHz and having dimensions of 12 × 18 × 0.8mm is reported in [9].

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