Introduction of 5.8Ghz Microwave Radar Module

5.8G microwave radar module is a high sensitivity 5.8G Hz millimeter wave human presence detection radar module. Unlike traditional methods that only detect the human body’s large-scale movement to determine the presence of different people, this module can be extremely sensitive to detecting the human body breathing and other small movements to determine the presence of people. Therefore, no matter whether the human body is sitting still, sleeping and other states can accurately sense the presence of people.

How does the 5.8G microwave radar module work?

5.8G microwave radar module sensing results can choose to output via serial port or via I / O port high and low level output, and the sensor module has a strong sense of reliability, high sensitivity, small size, simple to use, strong anti–jamming, easy to integrate and so on. It can be widely used in lighting, security, homes, home appliances, hotels, garages, buildings, transportation and other industries that need to detect micro-movement, movement of the human body.

5.8G Microwave Radar Module Technical Specifications

Operating voltage: 4.5~5.5V

Operating current: 22mA

Detection distance: 11m

Equivalent transmission power: 3-5dBM

Beam angle: 120*120°

Modulation mode: FMCW, CW

Operating frequency: 24GHz

Operating Temperature: -40~85°C

Baud rate: 115200

Size: 24*28mm

5.8G radar module interference problems

Attention should be paid to the module shining directly on air conditioners, curtains, fans, green plants, etc., because if these objects swing, it may cause the module to misrecognize;

At the same time , we must pay attention to the module beam irradiated to the ground, wall or door, produce mirror reflection of multiple reflections, indirectly detect the above interference objects;

The appropriate configuration of the maximum detection distance, sensitivity and delay time parameters can eliminate some of the object interference.

When multiple modules are installed centrally, keep a distance of more than 1.5m between each other, and irradiate in the same direction or in the opposite direction to avoid mutual irradiation of each module.

Microwave radar module welding method

Microwave radar module consists of metal substrate, microwave dielectric board and components. Its welding content includes microwave media board large area welding and component welding two parts. Microwave radar module welding process mainly has step welding, step welding and one-time welding and other three methods. Each method can realize the welding of the microwave radar module device, but they have their own advantages and disadvantages. Mainly based on the structural characteristics of the product, the type and number of devices, capacity requirements, microwave performance requirements, reliability requirements and the ability of production equipment to choose a reasonable welding process.

1.Welding step by step

The step-by-step welding process refers to the microwave radar module using reflow soldering and manual welding step-by-step implementation of the process. The process is generally divided into two major processes, the first large area welding process, to achieve a highly reliable connection between the microwave media board and the metal substrate, to ensure that they meet the requirements of heat dissipation performance and microwave grounding requirements; the second manual welding process, to achieve capacitive chip components, integrated circuits, QFN and power tubes, and other components, such as manual welding.

This method is mainly applicable to microwave radar modules with a small number of components and easy manual welding. Its advantages are simple and convenient operation, no need for large-scale production equipment, and simple tooling design. However, there are certain defects in manual welding. On the one hand, it is easy to have problems such as miswelding and leakage of components, and it is necessary to do a good job of checking the conformity of the devices. On the other hand, for some of the grounded weld joints, because the printed board has been welded to the base plate, resulting in a large heat capacity of the grounded weld joints of the printed board, making it difficult to weld.

2.Step welding

Step welding process refers to the microwave radar module using low temperature solder welding components and room temperature solder welding microwave media board and shell process technology, the two welding processes used in combination. First of all, the surface mount technology (SMT) process, components and microwave dielectric board are reliable and high precision welding; and then use a large area welding process, to realize the microwave dielectric board and the metal substrate of the high reliability of the connection, to ensure that they meet the requirements of heat dissipation performance and microwave grounding requirements.

This method is mainly applicable to microwave radar modules with a large number and complex types of components suitable for surface mounting. Its advantages are high degree of automation, high assembly efficiency, good welding consistency of modules and high reliability; disadvantages are two kinds of gradient welding solder system, process windows are small, temperature control is difficult.

3.One-time soldering

The one-time welding process refers to the combination of the SMT process and the large area welding process to achieve simultaneous welding of microwave radar module components, microwave media board and shell. One-time welding process: first SMT process, complete microwave media board solder paste printing and component placement, and then carry out large area welding process, complete shell spot coating solder paste and microwave media board, metal substrate and fixture clamping, and finally a one-time reflow soldering.

The one-time selling process is mainly applicable to microwave radar modules that are suitable for surface mounting and have a large number and complex types of components. Its advantages are a high degree of automation, good consistency and high reliability, and only one reflow soldering process, making the process simplified, but the method of tooling design requirements are high.