Microwave sensor

Technical Field

The present invention relates to X-band microwave signal, in particular used for long-distance detecting body, object or microwave sensor of the movement of a vehicle.

Background Art

Currently, X-band of the microwave sensor, is mainly used for such as alarm probe and other an Fanglei products and an automatic door sensor, and the like, used for detecting human body motion sensor signal, such sensors in the detection distance of 20 meters, such as used for moving large objects such as vehicles, a far distance of few domestic of the microwave sensor.

Content of the invention

The purpose of this invention is to provide a long-distance detecting body, object or microwave sensor of the movement of a vehicle, the microwave sensor is used for detecting the moving vehicle, the induction distance can be up to 120 meters. Can be widely used in indoor, outdoor security, industrial appliances or equipment automation control and the like.

In order to achieve the above-mentioned invention, the present invention provides a technical proposal:

A microwave sensor, characterized in that, the 85 × 85 mm on the double-sided circuit board, a field effect transistor and HJ-FET DRO microwave medium of the microwave oscillator, a power distributor, mixer, microstrip line, transmitting antenna, a receiving antenna, the microwave shielding plate. 5V power supply by the power supply and signal connection positioning cuffs, through the microwave sensor to the source resistance power supply of the microwave sensor, the microwave signal shielding aluminum shell, a field effect transistor and HJ-FET DRO microwave oscillator a microwave medium, microwave oscillator produced 10.525Ghz microwave signal, by the signal coupling capacitance to the outside through the emitting antenna transmitting a microwave signal, a human body or an object is moving within the detection range, receiving antenna the induction signal is input to the microwave mixer, and a microwave oscillator generated signal mixing, by microwave mixer output reflect human body or object is moving low frequency of the Doppler signal. In order to improve the sensing distance of the microwave sensor, the sensor of the microwave transmitting and receiving antenna, adopt the circuit board plane, double 4 × 2 array antenna structure, improves microwave signal gain, the sensor has a more narrow microwave signal coverage beam, the microwave sensor is used for far distance during the detection of the moving target, the reliability is high.

Preferably, the microwave oscillator has HJ-FET field effect transistor (5) and microwave medium DRO (6) composition, microwave medium DRO (6) process for the paste on the circuit board.

Preferably, the microwave sensor adopts a thickness of 0.8 mm of the double-sided circuit board, the size of the external appearance of 85 × 85 mm (1), with a mounting screw aperture 3 mm (2), is located in the four corners of the circuit board.

Preferably, the microwave signal shielding aluminum shell with the four corners of the (4-1), (4-2), (4-3), (4-4), a diameter of 3 mm the screw, the shielding aluminum shell (4) is fixed on the line of the center plate.

Preferably, the circuit board is also provided with a power and signal connection positioning straight needle (3).

Preferably, on the circuit board of the microwave sensor, in the microwave signal shielding aluminum shell (4) in, a field effect transistor HJ-FET (5), microwave medium DRO (6), the microwave mixer (7), a microwave emitting antenna coupling capacitor (8), a supply resistor of the microwave sensor (9) the electronic component.

Preferably, the microwave sensor circuit design using microstrip line structure, the microstrip line by a circuit designed to be made of copper foil, located in microwave signal shielding aluminum shell (4) inside.

Preferably, the microwave sensor using double-sided circuit board, the circuit board on the other side is provided with a symmetrical structure of the transmitting antenna of the microwave sensor (10) and receiving antenna (11), is made by the circuit board copper foil, the transmitting antenna of the microwave sensor (10) of the double -4 × 2 array antenna is formed by the (10-1), (10-2), (10-3), (10-4); ; the receiving antenna of the microwave sensor (11) of the double -4 × 2 array antenna is formed by the (11-1), (11-2), (11-3), (11-4) composition.

As can be seen by the above-mentioned technical scheme, the invention is a microwave sensor 85 × 85 mm, a thickness of 0.8 mm of the double-sided circuit board, is provided with a microwave signal shielding aluminum shell, in the microwave signal shielding aluminum shell, a field effect transistor and HJ-FET DRO microwave medium of the microwave oscillator, power distributor, the mixer circuit. The microwave oscillator 10.525Ghz microwave signal, by the signal coupling capacitance to the outside through the emitting antenna transmitting a microwave signal, a human body or an object is moving within the detection range, receiving antenna the induction signal is input to the microwave mixer, and a microwave oscillator generated signal mixing, by microwave mixer output reflect human body or object position moving low-frequency Doppler signal, so as to realize the movement of the human body or object position detecting function. The induction signal of the microwave sensor, safety precautions can be widely because the indoor and outdoor, industrial electric appliance or equipment the field of automatic control, human body or object position detecting moving target.

Description of drawings

Figure 1 is a basic block diagram of the microwave sensor of this invention.

Figure 2 is an electrical schematic diagram of the microwave sensor of this invention.

Figure 3 the double-sided circuit board of the microwave sensor of this invention, the structure and components positions on the map.

Figure 4 the double-sided circuit board of the microwave sensor of this invention, the other side of the array antenna pattern structure and appearance.

In:a double-sided circuit board of the microwave sensor 85 × 85 mm (1), the circuit board fixing screw aperture 3 mm (2), power supply and signal connection positioning straight needle (3), the microwave signal shielding aluminum shell (4), the diameter of the shielding aluminum shell fixing screw 3 mm (4-1), field effect transistor HJ-FET (5), the microwave dielectric oscillator DRO (6), the microwave mixer (7), a microwave emitting antenna coupling capacitor (8), a supply resistor of the microwave sensor (9). The double-sided circuit board with the other side of the transmitting antenna of the microwave sensor (10) and receiving antenna (11), microwave transmit double 4 × 2 array antenna is formed by the (10-1), (10-2), (10-3), (10-4); ; a microwave receiving double 4 × 2 array antenna is formed by the (11-1), (11-2), (11-3), (11-4) composition.

Mode of execution

With the embodiment of the Figures and further explanation of the present invention.

As shown in Figure 1-Figure 4 is shown, the invention is a microwave sensor 85 × 85 mm on the double-sided circuit board, is provided with a microwave signal shielding aluminum shell, and the 4 a diameter of 3 mm is fixed on the screw of the position of the center of the circuit board. In the microwave signal shielding aluminum shell, 5V power supply through the power supply resistance R to the microwave oscillator circuit power supply, the microwave field effect transistor and HJ-FET DRO microwave oscillator a medium, generating 10.525GHz microwave signal. A relatively high frequency of the microwave signal, the microwave oscillator circuit, power divider circuit, mixer circuit and mixing detector, a microstrip transmission line structure, is designed to be made of the copper foil of the double-sided circuit board, the microwave medium DRO, in the adhesive process, affixed on the circuit board of the microwave sensor.

The generation of the microwave oscillator 10.525GHz microwave signal, through the signal coupling capacitance C input to the power distributor and the transmitting antenna T1, the transmitting antenna T1 microwave signal directional transmission to the outside, the detection range of the sensor, there is no human body or object is moving, mixing detector no induction Doppler signal output.

A human body or an object within the detection range is to achieve, receiving antenna R1 the induced microwave signal, D and microstrip line input to the microwave mixer circuit in which, through the power divider circuit and a microwave oscillator after the frequency mixing generated signal, output by mixer 30-100Hz IF low frequency of the Doppler signal, the frequency of the signal can reflect the speed of the human body or object is moving, the amplitude of the signal reflecting human or the object size and the object distance from the sensor.

Microwave sensor transmitting and receiving antenna, adopt the circuit board plane, double 4 × 2 array antenna structure, in order to obtain greater microwave signal gain, the microwave sensor, the inductive distance up to 120 m, at the same time also the microwave signal has a relatively narrow coverage beam, so that the microwave sensor is used for, such as long distance vehicles, during the detection of the moving target, the reliability is high.

The utility of the microwave sensor of this invention:

1: the working frequency is high, the anti-interference capability.

2: circuit board design using microstrip line structure, the use of few components, the cost is low.

As can be seen from the above technical scheme, the present invention, the microwave signal generated by a microwave sensor, microwave sensor on the circuit board through the transmitting antenna T1 and receiving antenna R1, can be realized of a moving object or moving human body detection, output low frequency Doppler signal, after processing this signal is amplified, can be widely used in the human body or object inductive lamp, inductive energy-saving electrical appliances, automatic camera apparatus and automatically sensing the field of control devices and the like.

The above expression the embodiments of the present invention, it should be pointed out that, for the ordinary technicians in this field are concerned, without breaking away from the premise that the concept of this invention, can also make a number of deformation and improved, these all belong to the scope of protection of this invention. Therefore, the scope of protection of the Patent of this invention should be based on the annexed claim.