NDLI: Compact self-isolated MIMO antenna system based on quarter-mode SIW cavity

Content Provider	IET Digital Library
Author	Niu, Bing Jian Tan, Jie Hong
Abstract	A compact self-isolated multiple-input–multiple-output (MIMO) antenna system is proposed. It is based on a quarter-mode substrate integrated waveguide (SIW) cavity where two edges are shorted by metallic vias and the other edges are open. A narrow slot with a rotated angle of 45° is utilised to divide the single cavity into two equal eighth-mode sub-cavities. These sub-cavities are fed by two coaxial ports to construct the proposed MIMO antenna system. A self-isolated mechanism that cavity energy inputted by one port is radiated into free space rather than transmitted to the other port is first observed. High isolation between two antenna elements can be obtained without additional isolating or decoupling networks although they are contacted with each other. A fabricated prototype operating at 3.5 GHz achieves the measured port isolation of higher than 18.5 dB, envelope correlation coefficient (ECC) of less than 0.04, the peak gain of 4.6 dBi, and maximum efficiency of 79.2%. With advantages of compact size, high isolation, low ECC, and good radiation performance, the proposed self-isolated MIMO antenna system is a good candidate for wireless communication.
Starting Page	574
Ending Page	576
Page Count	3
ISSN	00135194
Volume Number	55
e-ISSN	1350911X
Issue Number	Issue 10, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/55/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2019.0606
Journal	Electronics Letters
Publisher Date	2019-04-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Additional Isolating Antenna Array Antenna Element Antenna Radiation Pattern Cavity Energy Coaxial Ports Compact Self-isolated MIMO Antenna System Compact Self-isolated Multiple-input–multiple-output Antenna System Compact Size Current 4.6 A Eighth-mode Sub-cavities Frequency 3.5 GHz High Isolation Measured Port Isolation MIMO Communication Noise Figure 18.5 DB Quarter-mode SIW Quarter-mode Substrate Integrated Waveguide Cavity Radio Link And Equipment Single Antenna Single Cavity Substrate Integrated Waveguide Waveguide And Microwave Transmission Line
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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