A Four-Port MIMO Cylindrical DRA with High Isolation in Ultra-Compact Size for WLAN Applications

A novel ultra-compact four-port multiple-input-multiple-output (MIMO) cylindrical dielectric resonator antenna (DRA) with improved isolation is proposed for WLAN applications in this paper. The antenna is originally radiated with the assistance of two different excitation mechanisms to generate deco...

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Bibliographic Details
Published inMicromachines (Basel) Vol. 14; no. 9; p. 1671
Main Authors Li, Xue-Ping, Ji, Jun-Fei, Duan, Chang-Jiao, Sun, Qian-Qian, Li, Wei, Zhang, An-Xue
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 27.08.2023
MDPI
Subjects
Antennas
Antennas (Electronics)
Coupling
Cylindrical antennas
cylindrical dielectric resonator antenna (DRA)
Decoupling
Design
Dielectrics
Ground plane
Impedance matching
Local area networks
multiple-input-multiple-output (MIMO)
Radiation
Radio antennas
Resonators
Slits
Technology application
Wireless local area networks (Computer networks)
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Summary:A novel ultra-compact four-port multiple-input-multiple-output (MIMO) cylindrical dielectric resonator antenna (DRA) with improved isolation is proposed for WLAN applications in this paper. The antenna is originally radiated with the assistance of two different excitation mechanisms to generate decoupled orthogonal modes. To further diminish the coupling field and improve the isolation, a suitable U-shaped slot is created on the common ground plane. Two additional rectangular slits are also etched to adjust the impedance matching of other ports. To better reveal the operating mechanism of the decoupling scheme, the common mode (CM) and differential mode (DM) impedance analysis methods between DRA ports are presented. The etched U-shaped slot can tune the impedance of CM and DM to be consistent to realize the decoupling. The antenna is simulated, fabricated, and tested to verify the decoupling mechanism. The results demonstrate that the isolation between ports 1 and 2 is enhanced from 5 dB to 23 dB, and other ports exhibit low coupling of better than 12 dB. Moreover, the antenna with the full size of 30 × 30 × 8.1 mm3 can be used either as a four-port DRA with a bandwidth of 300 MHz or as a two-port DRA with a bandwidth of 700 MHz, at a center frequency of 5.6 GHz.
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ISSN:2072-666X
2072-666X
DOI:10.3390/mi14091671