Electronic device

An electronic device comprising:

• a transmission unit configured to transmit a transmission wave from a transmission antenna;
• a reception unit configured to receive, from a reception antenna, a reflected wave that is the transmission wave having been reflected;
• a controller configured to detect an object that reflects the transmission wave, based on a transmission signal transmitted as the transmission wave and a reception signal received as the reflected wave;
• a power supply device configured to supply electric power to at least any of the transmission unit, the reception unit, or the controller;
• and
• a substrate on which the transmission antenna, the reception antenna, the controller, and the power supply device are disposed, wherein
• the transmission antenna and the reception antenna are disposed on a first surface of the substrate,
• the controller and the power supply device are disposed on a second surface of the substrate, the second surface being opposite to the first surface,
• the substrate includes a waveguide configured to guide at least one of the transmission wave or the reflected wave between the first surface and the second surface, and
• the waveguide is covered with an electromagnetic wave shielding member that is apart from the second surface of the substrate by a distance of 1/4 of a wavelength of the transmission wave or the reflected wave.