Radar system for detecting surroundings, comprising a waveguide antenna made of a printed circuit board and a molded part

A radar system comprising:

• a circuit board having at least one high-frequency component with at least one element for signal transmission and reception;
• a molded part;
• and
• at least one antenna for transmitting and receiving radar signals disposed on an upper side of the molded part,
• wherein a connection between the at least one element for signal transmission and reception and the at least one antenna is realized by inner waveguides,
• wherein the at least one element for signal transmission and reception is configured to emit signals in a direction of the circuit board or receive signals from the direction of the circuit board,
• wherein the circuit board is permeable by radar waves in a region of the at least one emitting or receiving element,
• wherein the molded part is arranged on the side of the circuit board opposite the at least one high-frequency component and is conductively connected to the circuit board,
• wherein at least one hollow waveguide is formed by a depression on the side of the molded part facing the circuit board and a metallized surface of the circuit board,
• wherein the at least one waveguide is fed from a permeable location of the circuit board, and
• wherein the molded part consists of a metallized single-layer plastic part.