A novel 2.4-GHz low-profile MIMO antenna with reconfigurable frequency-selective reflectors

Ching Han Tsai*, Jai Shan Sun, Shyh Jong Chung, Jenn Hwan Tarng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper, a novel low-profile multiple-input multiple-output (MIMO) antenna system is presented for WiFi IEEE 802.11a/b/g/n/ac/ax applications. The proposed compact 2.4-GHz antenna system employs two beam-switching antenna cells for MIMO operation. Each antenna cell is composed of four reconfigurable frequency-selective reflectors (RFSRs) and a one-to-four switching feeding network. The RFSRs are constructed using a one-wavelength metal loop resonator, which, by controlling the switching network, functions as a radiating antenna or a wave reflector to reflect beams to a specific direction. The feeding switching network utilizes PIN diodes to adjust the phase and impedance required for changing the operational status of each RFSR. The overall dimensions of the antenna system, including the metallic ground, are 120 mm * 120 mm * 9.5 mm. Moreover, the measured operational bandwidth of the 2.4-GHz antenna is approximately 100 MHz, and the radiation efficiency of each directed beam is 40%–70%.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalAdvanced Electromagnetics
Issue number2
StatePublished - Oct 2020

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