Abstract
This paper presents a low-profile dual-wideband multiple input multiple output (MIMO) antenna with low envelop correlation coefficient (ECC) for long-term evolution (LTE) and wireless fidelity (Wi-Fi) applications. The antenna covers LTE band 7 and Wi-Fi as well as wireless broadband (Wibro) and Worldwide Interoperability for Microwave Access (WiMax) (except for the 3.5-GHz band). To aid with integration of a practical mobile terminal, the MIMO antenna elements are placed at appropriate locations by analyzing the surface current distribution and without using any additional isolation techniques. The measured bandwidths with reflection coefficients of <−10 dB are 36.8% in the range 2.02–2.93 GHz and 23.4% in the range 5.10–6.45 GHz. Isolation is satisfied to be >20 dB in the operating frequency ranges of both LTE band 7 and Wi-Fi. Additionally, the calculated ECC is in the range0.005<ρ<0.025, which is considerably lower than theρ<0.5required for MIMO applications. The measured radiation patterns are appropriate for mobile terminals, and omnidirectional radiation patterns are obtained.
Highlights
Wireless communications systems should be of high quality and should provide services with a high data rate
The isolation was less than −20 dB across the operating frequencies of long-term evolution (LTE) band 7 and WiFi applications, and, these results are of practical utility
We have described a compact multiband multiple input multiple output (MIMO) antenna with low envelop correlation coefficient (ECC) for LTE band 7 and wireless fidelity (Wi-Fi) applications
Summary
Wireless communications systems should be of high quality and should provide services with a high data rate. It is relatively simple to implement a wireless communications system at a base station using antenna separation into many wavelengths; for high-quality wireless download signals, more than one antenna is required on the terminal side In this type of mobile terminals, two or more antenna elements are employed, and, here, the restricted space available for the antenna is an issue of achieving channel separation [3]. Some attempts have been made to design arrays with little interference using mushroomlike electromagnetic band-gap structures, ground structures containing defects, and parasitic elements [8,9,10] These techniques cannot be employed in a practical mobile terminal with a printed circuit board (PCB) along with other. CST Microwave Studio was used for the design and analysis of the structure, which was subsequently fabricated and characterized
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