Yupiteru Industries Co., Ltd.

Yuichi Kajita

Hisao Ono

Motoshi Sawada

Akira Ito

Tetsuya Hosoi

Shinji Koike

Mitsuhiro Imura

Takehiko Sugiura

A microwave detector for detecting faint detection target microwave signals is constructed from a heterodyne-type reception portion equipped with an antenna for picking up microwave signals, a local oscillator for repeatedly carrying out a sweep operation, and a mixer for frequency mixing the output from the antenna with the output from the local oscillator, wherein the heterodyne reception portion outputs detected wave signals based on the output from the mixer; a digital processing portion which receives the detected wave signals outputted from the reception portion, wherein the digital processing portion is designed to output a High pulse when the level of the detected wave signals reaches or exceeds a prescribed reference level, and a Low pulse when the level of the detected wave signals is below the reference level; a sweep control portion for controlling the sweep operation of the local oscillator based on the High and Low pulses outputted from the digital processing portion; and a judgement portion for judging whether or not a detection target microwave signal has been detected based on at least one measured or calculated quantity such as the total time High pulses are outputted by the digital processing portion, the total time a sweep stop is carried out by the sweep control portion, the total time required to complete a sweep, or a relationship between the total time High pulses are outputted and the total time Low pulses are outputted (e.g., the duty thereof). Further, a separate judgement-use digital signal generating portion may be provided to enable sweep control and detection judgements to be carried out by separately generated digital signals, and the detection accuracy can be further improved by dividing each sweep into a plurality of sampling regions and by providing a signal discrimination portion or signal discrimination function.

Microwave detector

In order to detect microwaves from radar type speed measurement devices and microwaves leaking out of reverse detectors without being detected by such reverse detectors, a microwave detector is provided with a super-heterodyne type reception circuit for cyclically performing reception operations to receive target microwave frequencies of prescribed microwave bands, the reception circuit including a first local oscillator which can carry out a fixed oscillation at a prescribed frequency or a sweep of a prescribed frequency range established slightly outside the frequency range of the local oscillator of a reverse detector, and a plurality of second local oscillators having different oscillation frequencies, whereby the reception circuit is able to receive microwaves in the target bands and microwaves leaking out of the local oscillator of a reverse detector.

A microwave detector includes a horn antenna and cavity formed by covering a metallic film of a printed substrate with an opened bottom microwave circuit component, and further includes a mixer diode which is positioned at the feeding point of the horn antenna and sandwiched between the microwave circuit component and the printed substrate, the mixer diode including a mixer diode substrate having a first protruding portion at a first end of the mixer diode substrate and a second protruding portion at a second end of the mixer diode substrate, separate anode and cathode electrode patterns formed on a surface of the substrate which includes the protruding portions, and a beam-lead-type or flip-chip-type diode which is mounted to a surface of the mixer diode substrate near the center thereof, the beam-lead-type or flip-chip-type diode having an anode and a cathode which are surface mounted to the anode and cathode electrode patterns to form electrically conducting pathways therewith, wherein the first and second protruding portions are directly or indirectly connected respectively to the microwave circuit component and the printed substrate.

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Tokyo, Japan

Yuichi Kajita