An Improved Endfire Planar Antenna for 5G Mobile Handsets Operating at Millimeter Wave Frequency

Endfire antenna is ideal for implementation in mobile handsets because it provides improved spatial coverage without blind spots. In this work an endfire antenna has been investigated that is operating at a millimeter wave (mmW) frequency of 30 GHz. Antenna design proposed in this work is a variation of a conventional tapered slot antenna (TSA) which has an exponential profile. Inductive slots have been loaded onto the conventional TSA in order to achieve the objectives of size reduction and gain improvement. Complete methodology adopted for designing both the conventional TSA and the modified TSA along with the comparative analysis of the two antennas in order to showcase the effects of inductive loading have been presented in this paper. The proposed antenna has a gain of 5.25 dBi with symmetrical endfire radiations in both the planes having half power beamwidth (HPBW) of 115 degree and 72 degree in ϕ= 0 degree and θ = 90 degree planes respectively. It has an impedance bandwidth of 7% and its physical dimension is just 5.75 mm X 4 mm. This antenna is ideal for implementation in mobile handsets for the next generation cellular communication network i.e. 5G.