Multiband Full-Metal-Rimmed Antenna Design for Smartphones

Abstract

In this letter, a multiband full-metal-rimmed antenna covering 10 frequency bands for personal wireless communication terminals is presented. The design antenna is based on simple and effective techniques that are used for metal-rimmed smartphone applications. The proposed antenna with full metal rim is designed on RO4350B substrate within the volume of 130 x 70 x 5 mm(3). We employed RO4350B substrate with inserted vias as metal rim with height of 5 mm, which surrounds the inner circuit board. The circuit board substrate has a ground plane, which is connected to the metal rim via extended substrate patch. This connection divides the rim into two metal rim strips. The combination of these two strips allows the design to operate on 10 bands. Performing perturbation on the ground plane further adds more operating bands and makes the design an excellent candidate for multiband operation. The designed antenna can be used to serve on GSM850/900, GPS, DCS, PCS, UMTS, WiBro at 2.35 GHz, Bluetooth, ISM, SDM-B at 2.65 GHz, WiMAX at 3.5 GHz, and C-band at 4 GHz wireless communication bands. A prototype antenna was fabricated and tested for input reflection coefficient, radiation performances, antenna gain, and efficiency. The measured and simulated results have been presented and discussed.