Metal Body-Integrated Open-End Slot-Antenna Designs for Handset LTE Uses

The metal body handset initiates various antenna design challenges. An assembly of two slots is proposed for long-term evolution (LTE) uses on metal body handsets. Several novel techniques are devised to address LTE operation needs. The slot openings are placed on the metal rim to minimize visual intrusion. The two-end open LTE high band (1700~2700 MHz) slot excites multiple adjacent resonances to stitch a broad operation band. The other one-end open slot adopts a coupled feed to provide a broad LTE low band (690~960 MHz). An unconventional two-branch feed network is proposed. Its frequency selective characteristic allows excitations of the two slots using a common feed. Parametric studies and tests that emulate the actual handset environment were conducted. Results demonstrate that the proposed antenna is resilient toward operation scenario changes and yields stable performances.