In millimeter-wave

the frequency drift of oscillators is very large

and phase-locked oscillators are often used

which make the cost of communication system very high.In this paper

a low cost W-band frequency tracing transceiver system is presented

which is used for digital communication.The data of tests indicate that

for 8448kbit/s

the threshold level is only 3dB higher than that of the millimeter-wave systems

in which phase-locked oscillators are used.At the same time

the scheme of this system is simple and the cost is low.The tests also show that the phase-locked loop has no obvious influence on the digital signal.