Radome having multi-size metal patterns and radar device using the same

A radar device using a radome having multi-size metal patterns, comprising:

• an array antenna for transmitting or receiving an electromagnetic wave;
• and
• the radome comprising:
• a plurality of dielectric substrates;
• and
• a plurality of metal layers, each of which comprises a plurality of metal patterns and a plurality of metal frames wherein the metal patterns are electrically insulated from each other, a gap width corresponding to one of the metal patterns of a first metal layer among the metal layers being a width of a gap defined between the one metal pattern and a nearest one of the metal frames to the one metal pattern, wherein the gap widths corresponding to the metal patterns have a trend of first increasing, then decreasing and finally increasing along a radial direction extending from a center to an outer edge of the first metal layer,
• wherein the dielectric substrates and the metal layers are alternately arranged, and outmost layers at both sides of the radome are two of the metal layers,
• wherein the metal layers have substantially identical layout,
• wherein there is a predetermined distance between the array antenna and the radome, and the array antenna transmits or receives the electromagnetic wave passing through the radome.