Dielectric Loaded High Gain Vivaldi Antenna for mmWave 5G Smartphones

A compact Vivaldi antenna for wireless mobile terminals is proposed. Proposed antenna is wide-band operating from 25-40 GHz with fractional bandwidth of 46%. Proposed antenna bears small physical footprint with dimensions of 6.2 × 9 mm
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thence can be easily accommodated along the edge of typical smartphone. End-fire gain of 5-6 dBi of the low profile Vivaldi antenna is achieved in the whole operating band. Stable radiation patterns with high pattern integrity are obtained. The 1-dB gain bandwidth of the proposed antenna is 46% with gain varying between 5-6 dBi over the whole operating band. Proposed antenna is accommodated along the edge of the typical smartphone with dimensions of 65 × 140 × 7 mm
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. Proposed Vivaldi antenna uses dielectric load of smartphone case modeled as Teflon substrate thereby enhancing the peak gain to 14.5 dBi. Integration of proposed low profile Vivaldi antenna in a typical mobile terminal is demonstrated.