Abstract
Planar inverted-f antenna (PIFA) and notch antenna are combined within a compact 2-port MIMO antenna. Electrical and magnetic duality of the two antennas avoids a critical coupling and best performances can be expected for multiple-input multiple-output (MIMO) communication. When excitation of notch antenna is optimized properly, the notch length can be short enough so that the two antennas can be colocated in a single compact volume. This compact multiantenna design is suitable for integration in MIMO handheld terminals. A prototype for broadband network application in 3.4–3.8’GHz frequency band has been characterized in anechoic chamber.
Highlights
Modern wireless networks have to meet the increasing needs in terms of throughput and reliability
If multiantenna are widely developed and used at base station and access point side, a key challenge is without a doubt the design of compact and wideband multiple-input multiple-output (MIMO) antennas for small terminals
In addition to classical antenna miniaturization effects on radiation efficiency and bandwidth, multiantenna performances are impacted by high coupling when antennas are very close
Summary
Modern wireless networks have to meet the increasing needs in terms of throughput and reliability. Due to small size of modern terminals, multiantenna has to be integrated in restricted volume with respect to the wavelength. In addition to classical antenna miniaturization effects on radiation efficiency and bandwidth, multiantenna performances are impacted by high coupling when antennas are very close. Two radiating elements are colocated in a single electrically small volume with dual polarization and pattern diversity. Planar inverted-f antenna (PIFA) and notch antenna are common radiating elements to be integrated at terminal because of small size. Different combinations of PIFA and notch have been reported in [1] for compact MIMO antenna design. PIFA and notch are combined with complete overlap and diversity can be integrated in a single antenna volume. A prototype for broadband MIMO communication is characterized in anechoic chamber
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