A novel printed log-periodic dipole array (PLPDA) antenna with bow-tie parasitic cell for the gain enhancement is presented for 5G mobile and wireless communication. The antenna is fed by the substrate integrated waveguide. The gain of the antenna is enhanced using parasitic cell-several bow-tie directors and bow-tie parasitic patches. The adding of bow-tie directors are based on the principle of the quasi-Yagi and the bow-tie antenna. Moreover, the parasitic patches are used to enhance the antenna gain by expanding the transverse radiation aperture of the antenna according to the principle of the antenna array. The proposed antenna has been designed, fabricated, and tested. It can be observed that the PLPDA antenna gain with the parasitic cell is increased about 1-dBi compared with the antenna with the single-sided rectangle directors. And the S11 of the proposed antenna is less than -12 dB, the cross-polarization level is better than -15 dB, and the gain of the presented antenna is 7.3-12.5 dBi over the whole operating frequency range of 40-50 GHz.