Open AccessCharacteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure
Author(s) -
FritzAndrade Erik,
PerezMiguel Angel,
GomezVillanueva Ricardo,
JardonAguilar Hildeberto
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2019.0570
Subject(s) - mimo , diversity gain , antenna (radio) , electronic engineering , coupling (piping) , patch antenna , reflection coefficient , microstrip antenna , correlation coefficient , microstrip , antenna array , topology (electrical circuits) , physics , acoustics , engineering , telecommunications , computer science , electrical engineering , optics , beamforming , mechanical engineering , machine learning
A multiple‐input–multiple‐output (MIMO) microstrip patch antenna array of four elements is proposed to cover the 5.8 GHz WLAN band. The characteristic mode analysis is carried out to design a defected ground structure that improves the MIMO performance without impacting negatively the radiation characteristics of the four‐element array. Simulations and measurements demonstrate that the implemented prototype reaches a maximum mutual coupling of −32 dB and a gain‐per‐element of 5.3 dB with good MIMO attributes, surpassing many other proposals in the antenna literature: maximum envelope correlation coefficient of 0.0001, diversity gain very close to 10 dB, capacity loss ( C loss) near to 0.0023 bps/Hz at the resonant frequency, multiplexing efficiencyη mux i jof 0.935, and a total active reflection coefficient weakly dependent on the excitation phases. The presented design is proposed for operation on the IEEE 802.11a/n standard.