A radar system for a vehicle comprising: an antenna arrangement for transmitting and/or receiving electromagnetic waves, said antenna arrangement comprising at least one antenna unit having at least one power amplifier and at least one antenna element; a power supply connected to said antenna arrangement, said power supply being arranged to supply said antenna arrangement with operating power; an antenna controller connected to said antenna arrangement, said antenna controller being configured to control an operation of said antenna arrangement; an auxiliary power source connectable to said antenna arrangement for supplying said antenna arrangement with supplementary operating power so to increase an output power of said antenna arrangement, wherein said auxiliary power source is rechargeable and connectable to said power supply; wherein said power supply is selectively and directly connectable to said antenna arrangement and to said auxiliary power source; a boost controller connected to said auxiliary power source and to said antenna controller, said boost controller being configured to: connect and disconnect said auxiliary power source to/from said antenna arrangement, connect and disconnect said power supply to/from said antenna arrangement, and connect and disconnect said power supply to/from said auxiliary power source, wherein said power supply is connected to said auxiliary power source in order to recharge said auxiliary power source. an antenna arrangement for transmitting and/or receiving electromagnetic waves, said antenna arrangement comprising at least one antenna unit having at least one power amplifier and at least one antenna element; a power supply connected to said antenna arrangement, said power supply being arranged to supply said antenna arrangement with operating power; an antenna controller connected to said antenna arrangement, said antenna controller being configured to control an operation of said antenna arrangement; an auxiliary power source connectable to said antenna arrangement for supplying said antenna arrangement with supplementary operating power so to increase an output power of said antenna arrangement, wherein said auxiliary power source is rechargeable and connectable to said power supply; wherein said power supply is selectively and directly connectable to said antenna arrangement and to said auxiliary power source; a boost controller connected to said auxiliary power source and to said antenna controller, said boost controller being configured to: connect and disconnect said auxiliary power source to/from said antenna arrangement, connect and disconnect said power supply to/from said antenna arrangement, and connect and disconnect said power supply to/from said auxiliary power source, wherein said power supply is connected to said auxiliary power source in order to recharge said auxiliary power source. connect and disconnect said auxiliary power source to/from said antenna arrangement, connect and disconnect said power supply to/from said antenna arrangement, and connect and disconnect said power supply to/from said auxiliary power source, wherein said power supply is connected to said auxiliary power source in order to recharge said auxiliary power source.