Universal Antenna with a Small Non-Ground Portion for Smartphone Applications
A new, multimode capacitive-fed antenna of size 80×5×4.5 mm3 is proposed for recent WWAN/LTE smartphone wireless applications. The antenna is located to the top edge of the mobile chassis; it occupies a very small non-ground area of 4.5 mm width. The structure is composed of three-edge coupled split-ring resonators (SRR) and two shorting strips. It uses a microstrip feed as a direct coupling line, which is attached to a dual L-shaped strips used to excite different radiating modes. The proposed antenna excites three monopole modes, four dipole modes,and three coupled-fed loop modes. By incorporating the excited modes, it covers all wireless standards and applications that are usually incorporated in recent smartphone devices between 790-6000 MHz. The operation mechanism is discussed and the final design is fabricated and tested in free space. Finally, a dual-element antenna is proposed for the implementation of multiple input multiple output (MIMO) antenna technology. Both results(simulated and measured) of performance parameters of the single element design, and the dual-element design show that the proposed design can be an excellent candidate for resent WWAN/LTE smartphones.
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