Abstract
The ever-growing expectation for high data rates has led to the introduction of multiple-input multiple-output (MIMO) technologies to wireless connectivity. Such a system requires an MIMO antenna with high isolation. At the same time, the MIMO dimension should not be compromised for achieving high isolation. Thus, isolation techniques that do not allow an increase in dimension need to be fostered for MIMO antenna design. In this paper, a novel low-profile, miniaturized MIMO antenna with high isolation was developed considering a split ring resonator (SRR)-based bandstop filter as a decoupling network. The bandstop filter was designed with a unit cell split ring resonator structure and was deployed between two closely spaced monopole MIMO antenna elements to obtain isolation as high as 39.25 dB at 2.61 GHz. Two open-circuit stub lines were attached with the MIMO feeding network to achieve good impedance matching at resonance frequency. The proposed antenna exhibited a peak gain of 3.8 dBi and radiation efficiency of 84%. It had a low envelop correlation coefficient (ECC < 0.12), high diversity gain (DG > 9.95 dB), low mean effective gain ratio (MEG 1/MEG 2 < 0.05 dB), and low channel capacity loss (CCL < 0.042 bits/s/Hz) at resonance frequency. The overall antenna dimension was restricted to for its easy integration in compact wireless devices.
Highlights
Due to the introduction of numerous multimedia devices, wireless communication networks today are capable of handling higher data rates than previous systems
The split ring resonator (SRR)-based negative-permeability metamaterial bandstop filter was used as a decoupling network to design a two-port multiple-input multipleoutput (MIMO) antenna of reduced dimensions (44 mm × 22 mm) and with an isolation of 39.25 dB
SRR-Based Bandstop Filter Design To diminish the coupling in the MIMO antenna, an SRR-based bandstop filter was designed on FR4 substrate
Summary
Due to the introduction of numerous multimedia devices, wireless communication networks today are capable of handling higher data rates than previous systems. A new way to design a decoupling network for antenna isolation with a metamaterialbased bandstop filter was presented in [24] This process of MIMO antenna design brought a reduction in dimensions, as well as an improvement in isolation. A novel attempt was made to reduce the overall dimensions and improve the isolation of an MIMO antenna for 2.6 GHz LTE communication This band is suitable for providing the required capacity to meet the demand for high data rates from a large number of subscribers in metropolitan cities and other high-traffic areas such as airports and industry belts. The SRR-based negative-permeability metamaterial bandstop filter was used as a decoupling network to design a two-port MIMO antenna of reduced dimensions (44 mm × 22 mm) and with an isolation of 39.25 dB. FiguFriegu1.reF1in. aFlincaolncfoingfiugruatriaotinonofotfhtheetwtwoo--ppoorrtt mmuullttiipplele-i-ninppuut mt mulutilptliep-loeu-otpuuttp(uMtI(MMOIM) aOnt)enannate. nna
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