JP3154156U - Microwave motion detector - Google Patents

Abstract

A microwave motion detector for detecting a surrounding moving object is provided which is small and inexpensive. The microwave motion detector includes a substrate, a vibrator, a printed circuit, a mixer, and a metal cover. The vibrator 20 is located on the substrate and provides a first signal. The printed circuit is located on the substrate and includes a first filter 31, a mixer 40, a second filter 33, a first radiation unit 34, a second radiation unit and a third filter 36. The first filter is electrically connected to the vibrator and the second filter is electrically connected to a directional coupler. The first radiation unit is electrically connected to the second filter. The third filter is electrically connected to the second radiation unit. Due to the Doppler effect, the microwave motion detector detects a moving object. [Selection] Figure 1

Description

  The present invention relates to a kind of microwave waveform detector, and more particularly to a microwave motion detector that detects a minute change caused by movement.

  The main function of the microwave motion detector is to detect moving objects, which are usually used in automatic control systems or residential security systems. The basic principle of microwave motion detector is the same as radar.

  Radar is a type of device that uses the reflected waves of radio waves to search for the direction and distance of a target. Its English notation “Radar” is a reduction of “Radio Detection And Ranging”, which is a direction search using radio waves. And has the meaning of measuring distance. Radar has many uses, for example, for detecting storms in weather forecasts. It also helps the controller to carry out the mission effectively in the safety aspect of air vessel navigation.

  The base of the theory used for radar is the Doppler effect. When the radar sends an electromagnetic wave in a specific direction and the target approaches the radar antenna, the reflected signal frequency becomes higher than the emitted signal frequency. Conversely, when the target moves away from the antenna, the reflected signal frequency becomes lower than the emitted signal frequency. Thereby, the relative speed of the target and the radar is calculated from the numerical change in frequency. The radar used for speed measurement in this way is also called Doppler radar.

  The present invention provides a kind of microwave motion detector and solves the problem that the volume of known technology is excessive and too expensive to manufacture.

  The microwave motion detector of the present invention includes a substrate, a cover, a vibrator, a printed circuit, and a mixer.

  The cover is fixed on the substrate, and the cover includes a first storage chamber, a second storage chamber, a third storage chamber, and a fourth storage chamber.

  The vibrator is located on the cover and generates a periodic signal.

  The printed circuit is located on the substrate and includes a first filter, a distributor, a second filter, a first radiation unit, a second radiation unit, and a third filter. The first filter is electrically connected to the vibrator, and the first filter is used to filter a periodic signal. The distributor is electrically connected to the first filter. The distributor divides the periodic signal into a send signal and a contrast signal. The second filter is electrically connected to the distributor. The second filter is used to filter the shipping signal. The first radiation unit is electrically connected to the second filter. The second filter is used to filter the shipping signal. The first radiation unit is electrically connected to the second filter. The first radiation unit wirelessly transmits a filtered shipping signal. The second radiation unit wirelessly receives the reflected signal. The third filter is electrically connected to the second radiation unit. The third filter filters the reflected signal.

  The mixer is located on the substrate, and the mixer is electrically connected to the distributor and the third filter. The mixer mixes the filtered reflected signal and the filtered contrast signal to form a mixed signal, and sends the mixed signal.

  Based on the frequency of the mixed signal, the microwave motion detector can determine whether there is a moving object in the vicinity.

  The microwave motion detector of the present invention also has the advantages of small volume and low cost.

It is an exploded view of the Example of the microwave operation | movement detector of this invention. It is another exploded view of the Example of the microwave operation | movement detector of this invention. It is an external appearance display figure of the microwave operation detector of the present invention.

  Please refer to FIGS. FIG. 1 is an exploded view of an embodiment of the microwave motion detector of the present invention, and FIG. 2 is another exploded view of the embodiment of the microwave motion detector of the present invention.

  The microwave motion detector of the present invention includes a substrate 10, a cover 80, a vibrator 20, a printed circuit 30, and a mixer 40.

  The vibrator 20 is located on the cover 80 and generates a periodic signal having a stable frequency and amplitude.

  The printed circuit 30 is located on the substrate 10. The printed circuit 30 includes a first filter 31, a distributor 32, a second filter 33, a first radiation unit 34, a second radiation unit 35, a third filter 36, a power input unit 37, a ground unit 38 and a signal output unit 39. Is included. The first filter 31 is electrically connected to the vibrator 20, and the first filter 31 is used to filter a periodic signal. The distributor 32 is electrically connected to the first filter 31, and the distributor 32 divides the periodic signal into a comparison signal with the shipping signal. The second filter 33 is electrically connected to the distributor 32. The first radiating unit 34 is electrically connected to the second filter 33, and the first radiating unit 34 wirelessly transmits a filtered shipping signal. The third filter 36 is electrically connected to the second radiation unit 35. The power input unit 37 is electrically connected to an external DC power source. The ground part 38 is electrically grounded.

  Among them, the first filter 31, the distributor 32, the second filter 33, and the third filter 36 are located on the front surface 10 a of the substrate 10. The first radiation unit 34, the second radiation unit 35, the power input unit 37, the ground unit 38, and the signal output unit 39 are located on the back surface 10 b of the substrate 10.

  The mixer 40 is located on the substrate 10, and the mixer 40 is electrically connected to the distributor 32, the third filter 36 and the signal output unit 39. The mixer 40 mixes the filtered reflected signal and the filtered contrast signal to form a mixed signal, and sends the mixed signal. Based on the frequency of the mixed signal, the microwave motion detector can determine whether there is a moving object in the vicinity.

  In this embodiment, the cover 80 is a metal cover. A position corresponding to the vibrator 20 and the first filter 31 in the cover 80, a position corresponding to the second filter 33, a position corresponding to the second filter 33, a position corresponding to the second filter 33, and a position corresponding to the third filter 36. The third storage chamber 806 is formed at a position corresponding to the distributor 32 and the mixer 40, and the fourth storage chamber 808 has an inclined surface 809. The second storage chamber 804 and the fourth storage chamber 808 communicate with each other through a groove, and the third storage chamber 806 and the fourth storage chamber 808 communicate with each other through a groove.

  The substrate 10 is typically a printed circuit board, but other types can be employed and the substrate 10 can be a hard board or a flexible board. Among them, the hard board is made of glass fiber or bakelite. The material of the flexible board is polyimide or polyethylene terephthalate.

  The vibrator 20 is a dielectric resonator, a crystal vibrator, a feedback vibrator, or the like.

  The printed circuit 30 is formed on the substrate 10 by a method such as lithography etching. Various patterns are formed on the printed circuit 30 using a method such as lithography etching, and the first filter 31, the distributor 32, the second filter 33, the first radiation unit 34, the second radiation unit 35, and the second Three filters 36 can be provided. Further, a printed line (not shown) is formed on the printed circuit 30 by a method such as lithography etching, and the first filter 31, the distributor 32, the second filter 33, the first radiation unit 34, and the second radiation unit 35. And the third filter 36 can be electrically connected.

  Further, a C-shaped pattern can be formed on the printed circuit 30 by a method such as lithography etching to form the distributor 32. Three finger-shaped patterns arranged in parallel on the printed circuit 30 can be formed as the first filter 31. Three finger-shaped patterns arranged in parallel on the printed circuit 30 can be formed as the second filter 33. Three finger-shaped patterns arranged in parallel on the printed circuit 30 can be formed as the third filter 36. Thereby, among the three finger-like patterns arranged in parallel, the middle finger-like pattern is larger than the finger-like patterns at both ends.

  The mixer 40 may be a single end mixer, a single balance mixer, or a dual balance mixer.

  In addition, the substrate 10 has holes 52, the cover 80 has protrusions 62, and the protrusions 62 are arranged corresponding to the holes 52, so that the cover 80 is fixed on the substrate 10.

  FIG. 3 is an external view of the microwave motion detector of the present invention. The cover 80 is fixed on the substrate 10 to obtain an actual product.

  In the microwave operation detector of the present invention, the vibrator 20 provides a periodic signal having a stable frequency and amplitude, and the periodic signal is divided into a dispatch signal and a contrast signal by the distributor 32. The first radiation unit 34 wirelessly transmits a dispatch signal, and the second radiation unit 35 wirelessly receives the reflected signal. Finally, the mixer 40 mixes the reflected signal and the contrast signal to form a mixed signal and outputs it. Depending on the frequency of the mixed signal, this microwave motion detector can detect whether there is a moving object around. The microwave motion detector of the present invention can use components such as a general printed circuit board, thereby achieving the advantages of small volume and low cost.

DESCRIPTION OF SYMBOLS 10 Board | substrate 10a Front 10b Back 20 Vibrator 30 Printed circuit 31 1st filter 32 Divider 33 2nd filter 34 1st radiation unit 35 2nd radiation unit 36 3rd filter 37 Power supply input part 38 Grounding part 39 Signal output part 40 Mixer 52 hole 62 projecting object 80 cover 802 first storage chamber 804 second storage chamber 806 third storage chamber 808 fourth storage chamber 809 slope

Claims (10)

In microwave motion detector,
A substrate,
A cover fixed on the substrate and including a first storage chamber, a second storage chamber, a third storage chamber, and a fourth storage chamber;
A vibrator installed on the cover to generate a periodic signal;
A printed circuit, located on the substrate,
A first filter electrically connected to the vibrator and used to filter periodic signals;
A distributor electrically connected to the first filter to divide the periodic signal into a comparison signal with a shipping signal;
A second filter electrically connected to the distributor for filtering the shipping signal;
A first radiation unit electrically connected to the second filter and wirelessly transmitting the filtered shipping signal;
A second radiation unit for wirelessly receiving the reflected signal;
A third filter electrically connected to the second radiation unit for filtering the reflected signal;
Including the printed circuit,
Located on the substrate and electrically connected to the distributor and the third filter, the contrast signal after filtering and the reflected signal after filtering are mixed to produce a mixed signal and output the mixed signal A mixer to perform,
A microwave motion detector comprising:   The microwave operation detector according to claim 1, wherein the first storage chamber is disposed at a position corresponding to the vibrator and the first filter.   The microwave operation detector according to claim 1, wherein the second storage chamber is disposed at a position corresponding to the second filter.   2. The microwave operation detector according to claim 1, wherein the third storage chamber is disposed at a position corresponding to the third filter.   The microwave operation detector according to claim 1, wherein the fourth storage chamber has a slope, and the fourth storage chamber is disposed at a position corresponding to the distributor and the mixer. Wave motion detector.   The microwave operation detector according to claim 1, wherein the second storage chamber and the fourth storage chamber communicate with each other through a groove, and the third storage chamber and the fourth storage chamber communicate with each other through a separate groove. A microwave motion detector.   2. The microwave motion detector according to claim 1, wherein the substrate has a first surface and a second surface, and the cover is fixed on the first surface, and the first radiation unit and the second radiation unit. Is located on the second surface of the substrate, the microwave motion detector.   2. The microwave motion detector according to claim 1, wherein the cover is a metal cover.   2. The microwave operation detector according to claim 1, wherein the mixer is a C-shaped pattern in the printed circuit.   2. The microwave motion detector according to claim 1, wherein the substrate has a plurality of holes, the cover has a plurality of protrusions arranged corresponding to the plurality of holes, and the plurality of protrusions are provided. A microwave motion detector, wherein the cover is fixed to the substrate in combination with the corresponding hole.

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