I recall an article in the early 1960's in Popular Electronics or Popular Science that described how to make such a device. It could only lift a pound or so, unfortunately. It consisted of two parallel grids of wire about 1 foot square or so, and each grid was attached to opposite polarities of a high voltage power supply providing + a few thousand volts to one grid, and - a few thousand to the other. This caused atoms of the air to be ionized and accelerated from one grid to the other, or something, and this provided a moderate amount of thrust. Of course, there are commercially available ion- motors for space craft. This is now a matured technology. The motors only provide about a = 0.001G or a few centimeters/sec/sec of thrust, but can do so for months at a time to build up a velocity V = a x time.