A miniaturized omnidirectional MIMO antenna with high isolation and low profile based on parasitic branches

By loading 'S'-shaped parasitic stubs into the MIMO antenna, the problem of isolation degradation caused by coupling between antenna elements is solved, achieving high isolation of a low-profile miniaturized omnidirectional MIMO antenna and ensuring the reliability and performance of the system.

CN116315639BActive Publication Date: 2026-05-26UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2023-04-06
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In miniaturized MIMO antennas, the reduced distance between antenna elements leads to increased coupling and high channel correlation, which affects system performance. In particular, on a metal floor, the isolation deteriorates, affecting the reliability of the MIMO system.

Method used

A binary PIFA array with a center-to-center spacing of 0.15λ is set on a metal floor, and 'S'-shaped parasitic stubs are loaded to suppress coupling current and improve isolation. The parasitic stubs are supported and fixed by polytetrafluoroethylene dielectric pillars. A centrally symmetric structure is designed, and the 'S'-shaped parasitic stubs provide an additional coupling path and introduce a 180° phase difference to cancel the coupling current.

Benefits of technology

Without increasing the antenna size, the isolation of the antenna was significantly improved, with the isolation at the center frequency increasing from 3.7dB to 28dB, and the isolation at high frequencies exceeding 26dB, meeting the requirements of the communication system and ensuring the reliability and performance of the MIMO system.

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Abstract

This invention discloses a high-isolation, low-profile, miniaturized omnidirectional MIMO antenna based on parasitic stubs, belonging to the field of antennas. The antenna has a centrally symmetric structure, consisting of two irregularly shaped PIFA antenna elements and an "S"-shaped parasitic stub. The irregular radiating surface of the irregularly shaped PIFA antenna elements is obtained by chamfering a rectangular radiating surface, and the chamfer creates a gap between the irregular radiating surfaces of the two irregularly shaped PIFA antenna elements. The "S"-shaped parasitic stub is arranged parallel to the metal ground plane and the irregularly shaped radiating surface, with the oblique stub in the middle parallel to the chamfered edge of the irregularly shaped radiating surface. This invention, by chamfering the radiating surface and loading an "S"-shaped parasitic stub, suppresses the coupling of the binary PIFA array, improves the isolation of the binary PIFA array, and ensures the reliability of the MIMO system.
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