Tri-Band Antenna for Compact Wireless Sensor Nodes Operating at 24/28/39 GHz

5G communication technology is an advanced arena of exploration that enables the communication with lower latency at ultra high speed. Planar antenna structuraes are fetching interest in 5G technology due to its multiband operating frequency and compact dimensions. In this work, tri-band, wide band antenna structure is designed. Antenna has covered 24/28/39 GHz bands with wide impedance bandwidth of 1.5/1/2.1 GHz respectively. T-shaped slot is printed in the ground plane to tune the resonance frequency. 24-GHz frequency spectrum covers the Industrial Scientific and medical band and used for short range communication; 28-GHz and 39-GHz bands are suitable for cellular and device to device communication. Antenna has good radiation efficiency of 92%, 79% and 95%, gain of 5.43 dB, 2.86 dB and 4.73 dB. Energy pattern shows the dipole like radiation characteristics at 24/28/39 GHz respectively.