Usingwaveguide as inputport, inside the waveguide we adopt adoubleantipodal fin-line transition, by adding trayandE-Tjunction, we canadjust the amount of the branches to get more poweroutput.
Though the keyboard comes at a premium, especially compared to Microsoft's Touch Covers, it offers some things Microsoft doesn't -- namely, a USB port, HDMI output and a built-in battery.