Microwave sensor

What is a Microwave Sensor?

Microwave sensor is an electronic device that uses electromagnetic radiation to detect movements. These electromagnetic waves consist of electric and magnetic fields that proliferate at speeds similar to light. The detector then analyzes the way back these waves reflect, referred to as echo time.

These sensors are incredibly versatile and can be used in various environments. They are especially useful in areas that cannot accommodate photo-electric sensors, such as high heat environments.


Microwave sensors emit microwave signals into their environment and measure how long it takes for the signal to bounce back. When something moves within the detection area, the signal will take a longer route and the sensor Merrytek Intelligent sensor recognises this change and triggers a light. This means the lights are only on when motion is detected, saving energy and money.

They are also able to detect movement through walls and glass, making them ideal for larger spaces. However, their sensitivity is a drawback as they can be easily triggered by movement that you don’t want them to react to. For example, drapery moving or pets walking past can cause a sensor to activate.

These sensors are ideal for use in areas that would be difficult to install photo-electric or PIR detectors. They are ideal for commercial properties with large outdoor spaces or if the building has a lot of obstructions. They can also be used in corrosive environments and are a great option for locations where flammable or combustible materials are handled.

As well as being able to detect movement through walls, a microwave sensor is a cost-effective way of securing your property. These sensors can be configured to ignore specific types of activity, such as children and pets, which helps reduce the number of false alarms. In addition, they can be installed in hazardous zones and are suitable for oil refineries and chemical and petrochemical plants.

Long Range

The long range capabilities of a microwave sensor make it ideal for many different applications. These sensors are able to sense motion at distances of up to 45000 mm, and can penetrate non-metallic surfaces. They can also operate without direct contact with objects, making them a useful choice for security systems and other types of industrial applications. Moreover, they can detect movements even in dirty, dusty and polluted environments.

Microwave sensors work differently than PIR sensors, and are less susceptible to interference. This is because they don’t rely on the presence of heat to trigger their signals. Instead, they emit microwaves, which bounce off surfaces and return to the sensor. The sensor then analyzes the delay in this return to determine if there is movement in the area. In addition, the sensors can be used in environments that would otherwise be unsuitable for sensors, such as those with high temperatures.

Another advantage of microwave sensors is their ability to penetrate walls and holes. This makes them a great choice for commercial and residential properties with complex structures. Additionally, these sensors are usually easier to install and program than other types of sensor systems. Lastly, they can be hardwired or wireless. A hardwired sensor will use a system’s RF signal to communicate with the panel, while a wireless sensor will connect via a radio transmitter and receiver.


The reliability of a microwave sensor depends on the design and installation. It is important to ensure the sensors are installed correctly and that they’re not exposed to any heat or other factors that can cause them to fail. Additionally, it’s important to choose a sensor with a high sensitivity. This will help you avoid false alarms caused by things like drapery or pets moving around your home.

A microwave sensor works by emitting microwave signals throughout its detection range and triggering a light when it detects motion. The sensor’s sensitivity is determined by how long it takes these signals to return, referred to as the echo time. It’s possible to increase the sensitivity of these sensors by using metamaterial-based couplers. This will allow you to use them in a wide range of applications.

Unlike PIR sensors, microwave detectors don’t rely on body heat to detect movement and are able to work through walls. This makes them more effective in harsh environments and in outdoor areas. They can also detect objects at distances ranging Microwave sensor from 25mm to 45000mm without physical contact and are highly reliable in military applications.

Another advantage of microwave sensors is their ability to detect a larger area of motion than PIR sensors. However, they tend to have a higher chance of false triggering, especially in areas with a lot of air movement.


Microwave sensors are a popular way to save energy costs in business settings. They work by emitting microwave rays into the space, and then measuring how long it takes for them to bounce back. When someone walks into the area, they disrupt the signals, and the sensor recognizes this change in echo time as movement. It then triggers the light to turn on. This technology is also used in elevator shaft-ways, and in some cars for safety purposes.

These sensors can detect motion in a wide range of environments, including through walls and ceilings. They are a good choice for spaces with multiple obstacles, such as warehouses and open-plan offices. They can also penetrate non-metallic surfaces and are suitable for use in outdoor applications. However, they require more power than PIR sensors, and may have a higher false alarm rate.

Microwave sensors are also pricier than their PIR counterparts, but they offer greater performance and a wider detection zone. These advantages make them a better choice for high-security applications. However, if you’re looking for a less expensive option, consider using a PIR sensor. This is a more reliable option for detecting the presence of intruders, as it does not require line-of-sight detection. It can also detect the presence of smaller objects, such as blowing leaves or branches.