This letter presents an antenna system for mobile
devices with an unbroken metal rim. By utilizing the characteristic
mode analysis for the unbroken metal rim, efficient MIMO
operation can be achieved. The design is based on antenna cluster
technique that uses several coupled elements that are used to
efficiently excite the modes of the rim. Non-resonant antenna
elements and matching networks are used to couple to the metal
rim. The design has small ground clearance of 5 mm, height of
only 4 mm, and can operate in wide bandwidths both in 700–
960MHz low band and 1.56–4 GHz high band. Measurement
results confirm that competent performance is achieved.
Index Terms—Characteristic modes, mobile antennas,
multiple-input multiple-output (MIMO), unbroken metal rim.
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