“…There are many kinds of Ka-band antenna, as reported in documents, including microstrip array antenna [1][2][3], waveguide array antenna [4][5][6], waveguide slot antenna [7], horn antenna [8][9][10], dielectric spherical lens feed antenna [11][12][13], and reflector antenna [14,15]. The efficiency of Kaband antenna is usually in the range of 50% to 60% [16].…”