Hitachi, Ltd.

Other

Hitachi Car Engineering Co., Ltd.

Shiro Oouchi

Terumi Nakazawa

Yoshiyuki Sasada

Norio Hasegawa

Sadayasu Ueno

Kanemasa Sato

Atsushi Koshizaka

Tadashi Isono

Naoki Minami

Mamoru Ooba

An object of the present invention is to provide a millimeter wave radar device and module that provides a hollow structure while assuring adequate moisture resistance. A multilayer substrate on which at least one millimeter wave MMIC is mounted and a cap for forming a hollow around the MMIC are joined together with an adhesive or other similar organic member to obtain a high-frequency characteristic. The resulting assembly is housed in a case and covered with a moisture resistance by a gelled organic resin. The nonairtight structure obtained in this manner permits the use of low-cost members and provides increased productivity.

Vehicle-mounted millimeter wave radar device, millimeter wave radar module, and manufacturing method thereof

To provide a filter cover which has little electromagnetic effect on a dielectric resonator and is able to lengthen the life of a press mold without impairing isolation between transmission and reception. A VCO comprising a dielectric resonator, a high-frequency oscillator, a base, a cover, in which the distance between the surface of the cover facing the dielectric resonator and the surface of the base facing the dielectric resonator is half or below of the effective wave length of the oscillator frequency, and the cover has periodic projections facing the dielectric resonator which are a quarter of effective wave length of the oscillator frequency, wherein the nearest distance between the surface of the dielectric resonator facing the cover and the surface of the cover facing the dielectric resonator is a quarter or over of the effective wave length of the oscillator frequency.

Radar apparatus

A high frequency transmitter-receiver which can prevent an antenna pattern from being broken. A radar apparatus is provided with a high frequency antenna, a base plate and a module. The antenna is comprised of an organic substrate and a metal pattern formed on the organic substrate. The high frequency antenna is adhered to the base plate astride the module. Here, the gap between the base plate and the module where the antenna is adhered is configured to satisfy the expression (an amount of change in gap size with respect to a change in use temperature)&divide;(an original gap size)&lE;6%.

High frequency transmitter-receiver

A method and apparatus are disclosed for measuring atmospheric pressure in conjunction with an air-fuel ratio sensor of the type comprising a concentration cell with atmospheric air and exhaust electrodes on opposite sides of a solid-state electrolyte having oxygen ion conductivity. During an atmospheric pressure measuring cycle, oxygen ions are pumped from the atmospheric air electrode to the exhaust electrode, in a quantity which is either predetermined at a fixed value, or is sufficient to bring the cell to an equilibrium state. Atmospheric pressure is then calculated from measured emf of the cell, using an experimentally derived functional relationship. In a second embodiment, ions are pumped until a predetermined change of the concentration cell emf is achieved, and atmospheric pressure is determined based on the amount of time required to achieve such change. The atmospheric pressure measuring mode is operated on a time shared basis with the air-fuel ration detection mode.

Air fuel ratio sensory

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Hitachinaka, Japan

Shiro Oouchi