Abstract
In this paper, a new low-profile smart 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 functions as a radiating antenna or a wave reflector to reflect beams along a specific direction, as controlled by the switching network. 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%.
Highlights
Multiple-input multiple-output (MIMO) technology plays an important role in wireless communication systems
Because MIMO technology increases the data rate, reduces multipath fading, and suppresses co-channel interference [1], this technique is widely used in consumer and portable electronic products, such as WiFi access points (APs), cellphones, and notebook computers [2,3,4,5]
In our previous studies [21,22], we developed a radiation pattern diversity antenna, which is different from the aforementioned two types of reconfigurable antennas, by combining the concepts of reconfigurable frequencyselective reflectors (RFSRs) and right-angle corner reflector antennas
Summary
Multiple-input multiple-output (MIMO) technology plays an important role in wireless communication systems. Because MIMO technology increases the data rate, reduces multipath fading, and suppresses co-channel interference [1], this technique is widely used in consumer and portable electronic products, such as WiFi access points (APs), cellphones, and notebook computers [2,3,4,5] To realize these favorable characteristics, multiple antennas with pattern diversity are required in MIMO systems. In [6,7,8,9,10,11,12,13,14,15], a unidirectional antenna design based on the Yagi–Uda antenna concept was proposed using various combinations of directors and reflectors to achieve pattern-reconfigurable features. To achieve the beam-reconfiguration feature, the four RFSRs are designed to be configured as radiators or reflectors The status of the RFSR is determined by a PIN diode switching network to fulfill the required beam-switching function
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