The invention discloses a high-isolation three-frequency four-unit
MIMO antenna. The high-isolation three-frequency four-unit
MIMO antenna comprises a
dielectric substrate, four
antenna radiation units, four coaxial feeding head, a grounding plate, two intermediate slot Y-shaped branches and four rectangular floor gaps, wherein each
antenna radiation unit employs a design of two antenna radiationsegment structures and comprises a first
antenna radiation segment and a second antenna
radiation segment, the first antenna
radiation segment is in an inverted N-shaped bending line shape, the secondantenna
radiation segment is in an L-shaped bending line shape, and the four antenna units are respectively placed at four corners of the
dielectric substrate and are arranged in a back-to-back way.The working frequencies of the
MIMO antenna are 2.5GHz, 3.5GHz and 5.8GHz, and the
MIMO antenna can be applied to WLAN (2.4GHz and 5.8GHz) and 5G (3.5GHz) communication; moreover, the antenna has highisolation degree, and isolation degree exceeding 15dB is obtained among the antenna units within a
frequency band higher than 2.4GHz; and the
MIMO antenna is relatively small in integral size, wide in
wideband and low in manufacturing cost and is simple to design, and
mass production and
processing are easy.