Denso Corporation

Masashi Urabe

Yuuji Kakuya

Masakazu Ikeda

Tomokazu Miyashita

Kenichiro Sanji

Kenichirou Sanji

Hiromichi Naito

Hiromichi Naitoh

Ryozou Fujii

Masahiro Fukuda

Koji Murayama

Ryozo Fujii

A wireless communication device for transmitting and receiving radio waves of a target frequency includes a ground plate having a rectangular shape, a zeroth-order resonant antenna element arranged at a position shifted from a center of the ground plate in a lengthwise direction of the ground plate, and a circuit module configured to transmit and receive signal via the zeroth-order resonant antenna element. The zeroth-order resonant antenna element includes a counter conductor plate arranged at a predetermined distance from the ground plate and having a feed point connected to a feedline, and a short circuit portion electrically connecting the counter conductor plate and the ground plate. The ground plate, the counter conductor plate and the short circuit portion are configured to cause parallel resonance at the target frequency and satisfy a condition that resonance caused by the ground plate is reduced.

Wireless communication device

An antenna device includes a ground plate which is a flat plate-shaped conductor member, an opposing conductive plate which is a flat plate-shaped conductor member installed at a predetermined distance from the ground plate and is electrically connected to a power supply line, and a plurality of short-circuit pins for electrically connecting the opposing conductive plate and the ground plate. One end of a plurality of short-circuit pins extends to a conductive plate plane, which is a plane including the opposing conductive plate, and the other end of the plurality of short-circuit pins extends to the ground plate plane, which is a plane including the ground plate. One or more of the plurality of short-circuit pins connect the opposing conductive plate and the ground plate.

Antenna device

A wheel registration apparatus applied to a vehicle comprises: a transmitter that is provided on each of the four traveling wheels provided with tires and has a first controller configured to create and transmit a frame including unique identification information; and a receiver that is provided on a vehicle body, receives the frames transmitted by the transmitters provided on the four traveling wheels via a reception antenna in a registration mode, and has a second controller configured to register four pieces of the identification information included in the respective frames as pieces of identification information of the transmitters provided on current four traveling wheels.

Wheel registration apparatus and tire pressure monitoring system including the same

Growing community of inventors

Kariya, Japan

Masashi Urabe