An antipodal Fermi-linear tapered slot antenna (AFLTSA) is presented for Ka-band applications. A substrate integrated waveguide is used to excite the tapered slot. The proposed design has a measured 26-40 GHz wide impedance bandwidth with a return loss below 15 dB. It maintains a flat gain of 16 dB over an entire frequency band. The knife edges are corrugation profile of AFLTSA exhibits side lobe level of 214 dB in H plane and 219 dB in E plane. It has a symmetric radiation pattern as well as a cross polarization level of 222 dB.

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