Effects of downscaling on radiation performance of impedance-matched ultrasmall antennas

This paper presents design and measurement verification of ultrasmall antennas with 1.16 GHz operating frequency. Two miniaturization techniques were applied including meander line-based near field resonant parasitic (NFRP) element and split ring resonator-based NFRP element. The designs were scaled down in four steps from ka = 0.825 to ka = 0.103 which is the ultimate design goal regarding the size of the antenna. Promising models were fabricated and corresponding results are measured. The gains of the antenna prototypes were compared among different designs and with the theoretical gain limit for different ka values. Promising models from this work can be applied for on-chip antenna design in the future.