This study presents a concept of requisite design antenna volume to evaluate the space-saving effectiveness in the design of a wire inverted-F antennas (IFA) inside a smartphone terminal. By adjusting properly the loading position, the IFAs shape, and the deployment of other device components around the IFAs, we propose an antenna model that can both cover completely the two cellular bands and save its required design space most effectively inside the terminal. The IFA is fed by only one port, and no matching circuit is used in the design.Index Terms -Handset antennas, small antennas, requisite design volume, space-saving, multi-band.
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