Open AccessBandwidth‐enhanced four‐antenna MIMO system based on SIW cavity
Author(s) -
Niu BingJian,
Cao YanJie
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2020.0799
Subject(s) - bandwidth (computing) , mimo , materials science , optoelectronics , electronic engineering , electrical engineering , optics , physics , engineering , telecommunications , beamforming
A bandwidth‐enhanced four‐antenna multiple‐input–multiple‐output (MIMO) system based on a substrate‐integrated‐waveguide (SIW) cavity is proposed. By etching two long rectangular slots on the top plane of the cavity, four quarter‐mode sub‐cavities with the same size are constructed and then individually fed by a coaxial port to form a four‐antenna MIMO system. Suitable port isolation is achieved by optimising the length and width of these slots. To enhance bandwidth, a pair of back‐to‐back L‐shaped slots is cut to split each sub‐cavity into three smaller parts. Three resonant modes are generated in these parts and merged into the operating band. A sample with the overall size of 0.58 λ 0 × 0.58 λ 0 × 0.02 λ 0 has been fabricated. Measured bandwidth is enhanced from 80 to 230 MHz and measured isolation is better than 15.0 dB. Owing to covering the band of 3.40–3.60 GHz, the proposed antenna system has potential applications for fifth‐generation communication.