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Planar microwave sensor

A microwave sensor, a planar technology, applied in the sensor field, can solve the problems of high cost, the second harmonic cannot meet the certification requirements, and the microwave sensor is large in size, and achieves the effects of low cost, small overall size, and simple manufacturing process.

Pending Publication Date: 2021-12-31
希斯塔(南京)电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a planar microwave sensor that solves the problems of the current microwave sensor, such as large volume, high cost, and failure to meet the certification requirements for the second harmonic. The specific scheme is as follows:

Method used

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  • Planar microwave sensor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, in conjunction with attached Figure 1-Figure 5 , a planar microwave sensor, comprising a PCB body, the PCB body is arranged in a four-layer structure from top to bottom, the surface layer of the PCB body is set as a circuit layer 6, and the bottom layer of the PCB body is set as an antenna layer 9 , an upper middle ground layer 7 and a lower middle ground layer 8 are arranged between the antenna layer 9 and the circuit layer 6, the upper middle ground layer 7 is arranged above the lower middle ground layer 8, and the upper middle ground layer 7 and the circuit layer 6 are provided with Medium I, the thickness of medium I is 0.6-0.8mm, and medium II is arranged between the lower intermediate formation and the antenna layer, and the thickness of medium II is 1.2-1.4mm;

[0029] The antenna layer is equipped with a transceiver antenna 3;

[0030] The circuit layer is provided with a transceiver circuit, and the transceiver circuit includes an oscillating ci...

Embodiment 2

[0036] Embodiment 2, according to the planar microwave sensor described in Embodiment 1, the thickness of the PCB body is 2.0 mm.

Embodiment 3

[0037] Embodiment 3, according to the planar microwave sensor described in Embodiment 1 or 2, a medium III is provided between two intermediate formations.

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Abstract

A planar microwave sensor comprises a transmitting-receiving circuit and a transmitting-receiving antenna. The transmitting-receiving circuit and the transmitting-receiving antenna are located on the surface layer and the bottom layer of a four-layer PCB respectively. A plurality of circuit modules are integrated on one PCB, so that the size is saved, the cost is reduced, and the noise floor of an intermediate frequency signal is at an optimal level; the sensor is small in overall size, simple in manufacturing process, low in second harmonic power, easy to authenticate, short in processing period, low in cost and good in signal coverage.

Description

technical field [0001] The invention belongs to the technical field of sensors, and more specifically relates to a planar microwave sensor. Background technique [0002] Microwave sensors are devices that use microwave characteristics to detect some physical quantities, such as information including the existence of sensing objects, moving speed, distance, angle, etc. Microwave sensors are currently widely used in household fields such as automatic doors, security products, lighting, etc. to detect human body movement induction signals. They are characterized by high detection sensitivity and strong anti-interference. The principle is generally based on the principle of Doppler radar. The current microwave sensor usually consists of three parts: oscillator, antenna and detector. The oscillator is a device that generates microwave signals. Traditional oscillators are mostly based on klystrons, magnetrons or some solid-state devices, and small oscillators can also be based on...

Claims

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Application Information

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IPC IPC(8): G01S7/03H01Q1/22H01Q1/38
CPCG01S7/03H01Q1/225H01Q1/38
Inventor 赵亚辉
Owner 希斯塔(南京)电子技术有限公司