The invention proposes a compact millimeter wave radar system for tracking a target by using the structure for transmitting the transmission signal reflected from the target signal to the signal processing. Signal receiving system to receive the reflected signal to the target in accordance with the present invention; Target information generator for generating information about the target on the basis of the reflected signal to a target; Target tracking controller for tracking the target, based on information about the target; And the signal reflected on the target as a structure to transmit part target information generated, as formed between the transmission line and the first waveguide, which edge face laminated to the entire formed inner space surrounded by the first conductor and the first conductor is formed on a portion of claim a first part comprising a first dielectric; A first waveguide and the second as being formed between the wave guide, a second part comprising a second dielectric material that is laminated to the inner space surrounded by a part formed on the second conductor and the second conductor is formed on the whole rim surface; And a second waveguide and the third as being formed between the waveguide and the third part-signal transmission structure for containing a third conductor which is formed on the whole rim surface.