Denso Corporation

Tetsuya Katayama

Kento Nakabayashi

Hiroyuki Ban

Junji Hayakawa

Akiyoshi Mizutani

Hisanori Uda

Masaru Ogawa

Yuichi Tanaka

Shin-ichiro Matsuzawa

Takeshi Miki

Koichi Hoshino

Kent Nakabayashi

An in-vehicle radar apparatus includes an interference determination means, a selection means, and a frequency changing means. The interference determination means determines presence or absence of interference between multifrequency CWs, which are radar waves, based on a beat signal generated by mixing a transmission signal and a received signal, which are radar waves. The selection means selects an own vehicle or an other-side apparatus, which is a party of the interference, according to an occurrence state of the interference, when the interference determination means determines that the interference is present. The frequency changing means that changes a center frequency of the multifrequency CW transmitted from the own vehicle, when the selection means selects the own vehicle.

In-vehicle radar apparatus

A radar apparatus forming a series-feed array-antenna includes an array antenna having transmission/reception antennas, and each antenna includes a plurality of antenna elements arrayed with feed-lines to be series-connected each other. A calibration line is disposed between the transmission antenna and the reception antenna via a switch which connects or disconnects the calibration line. The signal having a phase shift is transmitted via the calibration line when the switch connects the calibration line and an amount of phase shift from the signal transmitted via the calibration line is calculated based on a reference phase at the transmission antenna thereby calibrating the phase shift.

Radar apparatus provided with series-feed array-antennas each including a plurality of antenna elements

The present invention provides, as one aspect, a microstrip array antenna including a dielectric substrate, on a back face of which a conductive grounding plate is formed, and a strip conductor formed on the dielectric substrate. The strip conductor comprises a feeding strip line which extends in an extension direction, and at least two radiation antenna elements. At least one of the antenna elements is connected with one side of the strip line, and at least one of the antenna elements is connected with the other side of the strip line. The longitudinal directions of the antenna elements are parallel to each other and are at an angle of other than 90&#xb0; with respect to the extension direction. The strip line has a bending shape and fully extends in the extension direction so that the antenna elements are connected with the strip line at the same angle.

Microstrip array antenna

A microstrip line includes a signal strip conductor and a ground conductor. A coplanar line includes two regions. A first region includes a signal strip conductor which is connected to the signal strip conductor of the microstrip line via a wire or the like and a ground strip conductor which continues to the ground conductor. A second region is formed with a ground strip conductor formed above the ground strip conductor via a through hole. A transmission mode changes itself in the microstrip line, the first region of the coplanar line, and the second region of the coplanar line in the sequence as described. This enables converting the transmission mode efficiently from the microstrip line to the coplanar line.

High frequency circuit board converting a transmission mode of high frequency signals

A waveguide-transmission line converter has a waveguide including side walls which have inner corners at an open end of the waveguide. The inner corners are beveled to provide tapered inner surfaces. Even if a dielectric substrate is assembled out of alignment with the waveguide due to an assembling error, edges of a ground metal layer on the dielectric substrate are exposed from the beveled inner corners at the open end of the waveguide. The beveled inner corners keep the waveguide spaced widely from edges of a matching element on the dielectric substrate, preventing an electric field concentration from occurring between the waveguide and the matching element. The waveguide-transmission line converter has electromagnetic energy passing and reflecting characteristics prevented from varying.

Waveguide transmission line converter where the open end of the waveguide has a beveled inner corner

In the on-vehicle radar apparatus of the present invention, the vertical scanning width of the radar beam is narrowed, before the horizontal scanning, thereby avoiding unnecessary data processing and improving the data processing efficiently. Further, the S/N ratio of the target detection signal is increased, thereby stabilizing the distance detection and its accuracy. The vertical scanning antenna is a single travelling wave excitation antenna (TWEA) constructed by a plurality of antenna elements. At the same time, the horizontal scanning antenna is a multi-channel antenna wherein a plurality of TWEAs is assigned to a plurality of horizontal directions. The horizontal scanning angle is arbitrarily widened by increasing the number of TWEAs.

Radar beam scanning method, on-vehicle radar apparatus and radar scanning computer program

An insulating layer is formed on a semiconductor substrate, and a first resist layer having a first resist opening portion is formed on the insulating layer. Then, the insulating layer is etched thought the opening portion to expose the substrate. After removing the first resist layer, a second resist layer having second resist opening portions are formed. One of the second resist opening portions is provided to expose the substrate, and a recess is formed in the substrate through the opening portion. Further, the insulating layer exposed from the other of the second resist opening portions is removed. Then, an electrode member for gate, source, and drain electrodes is deposited on the substrate. As a result, variations in intervals between the gate and drain electrodes and between the gate and source electrodes can be reduced.

Method of producing a MESFET semiconductor device having a recessed gate

An analog switching circuit comprises an insulated-gate field-effect transistor (Q20) having two n-type input-side and outpu-side semiconductor regions (201, 202) and a p-type semiconductor substrate region 203, for controlling conductiveness between an input terminal (IN) and an output terminal (OUT) based on a gate potential. A surge pulse detecting circuit (1020), responsive to an electric potential (Vi) of the input terminal (IN), produces a detection signal of a surge pulse equivalent to a forward bias of a PN junction formed between the semiconductor substrate region (203) and the input-side semiconductor region (201). A substrate potential setting circuit (1010) varies an electric potential of the semiconductor substrate region (203) in response to the electric potential (Vi) of the input terminal (IN) when aby detection signal is produced. Furthermore, a gate potential control circuit (1030) varies the gate potential of the insulated-gate field-effect transistor (Q20) in the same direction as the electric potential of the semiconductor substrate region (203) when the detection signal is produced.

Growing community of inventors

Aichi-ken, Japan

Tetsuya Katayama