E-Tan Technology
At present, more and more lamps and radar sensors with radar are being used, and many people must have the question, "Does the electromagnetic radiation generated by the radar module have an impact on human health?"
Today, Xiaoyi will take you to understand the electromagnetic radiation of the radar module and popularize this problem.
EIRP:
First of all, let's take a look at the EIRP of the effective isotropic radiated power of electromagnetic waves. EIRP is used to measure the amount of radiation radiated by an RF system, which is ideally equal to the transmit power of the amplifier to the gain of the antenna.
The transmit power of the power amplifier refers to the transmit power of the RF chip used in the radar module, which is determined by the characteristic parameters of the chip itself, and the second is the antenna gain of the radar module. The antenna gain will not change at a fixed frequency, and the transmission power of the RF chip has a certain adjustable range. Our radar modules are designed to be configurable to meet performance needs. The radar module of Yitan Technology is also roughly divided into three levels: high-end, mid-range, and low-price.
The specific information on the transmission power of the 5.8GHz radar module and the 24GHz radar module mentioned in the video is as follows.
Our 24GHz EDQ15 series radar module, the peak RF power is generally less than 10dBm, which is basically in the specified standard value, such as our EDQ12Z radar module certification. Most of the radar modules of 5.8G are one-half to one-tenth of 24G, which is much smaller than the standard value.
Therefore, no matter which type of radar module of "369 and so on", the transmission power of the radar sensor is very small, but because many friends are relatively unfamiliar with the relevant knowledge of the radar sensor, they are not very clear about how much its transmission power is, whether it is within the safety standard to use, and whether it will have an impact on the human body and other public communication equipment?
In order to dispel everyone's doubts about this series. First of all, let's first understand the standard requirements of the "Catalogue and Technical Requirements for Micropower Short-range Radio Transmission Equipment" issued by the Ministry of Information Industry, and divide our current Class G and Class H equipment according to frequency:
E-Tan only makes products that meet the specifications, and there are unknown risks for non-compliant 3G, 4G and drifting 5.8G and 6G, which are not included.
The transmit power of our radar modules is much smaller than the limits in the Requirements. If you don't know it well, let's compare it with the mobile phone and router Wi-Fi that we are most exposed to in our daily life.
Mobile phone transmit power
Because the standard and working mode of 5G mobile phones are relatively complex, their maximum transmit power is also different, mainly concentrated in level 3 and level 2, and the corresponding transmit power is 23dBm ~ 26dBm, that is, about 200mW ~ 400mW.
Router transmit power
The transmission power of the router WIFI is the same as the transmission power of our radar module, and it is also affected by the transmission power of the chip and the gain of the antenna. There are many router brands on the market, and the chips and antenna gains of each model are also different, but everyone must meet national or international standards.
Therefore, whether it is the 5G mobile phone signal that accompanies us day and night, or the 2.4GHz and 5GHzWiFi signals of the router, its power is far greater than the microwave signal emitted by our radar sensors.
Although the radar module has little impact on the surrounding environment, equipment and people, in some cases, some wireless devices will still have some impact on the operation of the radar module, we have fully evaluated this, such as the impact of 5GHz router on the radar module, in addition, we have also done extreme scene tests:
In the laboratory, we put the radar module and a 5GHz router opposite, and keep the antenna polarization direction consistent, here we expand on it, why the polarization direction of the two antennas is the same? Because each antenna has its own specific polarization direction, only when the antenna polarization direction of two different devices is the same, each other can receive the largest signal of the other party, if it happens to be the same frequency, then it will also be affected by the strongest interference of the other party.
Then the two devices work at the same time, and gradually get closer to shorten the distance, and then check whether the WiFi signal of the router will interfere with the radar module, causing the phenomenon of the radar module being triggered by mistake. At the same time, see if the radar module affects the communication quality of Wifi.
In the actual application scenario, although the probability of such a coincidence is relatively small, in order to avoid the use of radar sensors under such extreme circumstances, we still recommend that you try to stay away from the wireless router when installing smart devices with radar sensors, and the distance is generally not less than 2m.
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