The signal from a wireless router can penetrate through walls. There are two things that determine whether or not the signal will go through the wall:
The frequency of the wireless router and how thick the wall is.
What affects my WiFi signals through the wall?
Frequency of signal
Lower frequency signals, such as 2.4GHz and 5GHz, tend to transmit and receive data effectively and penetrate through thinner walls. A higher frequency, such as 5GHz and 5.8GHz, tend to not transmit and receive data effectively and do not penetrate through thicker walls.
Thickness of wall
The thickness of the wall is another factor that determines whether or not a signal will go through the wall. The more thick the wall, the harder it is for a wireless network router to send its signal through it.
To make sure your router can definitely get around obstacles like this, we definitely recommend getting a new router with different frequencies (2.4 GHz and/or 5 GHz) and make sure your walls are thin enough for these signals to transmit and receive data effectively on them.
Lower frequency vs higher frequency signal
A lower frequency transitions its signal better than a higher frequency; therefore 2.4GHz and 5GHz signals can go through walls better than 5GHz and 5.8GHz signals.
The thickness of the wall is another factor that determines whether or not a signal will go through the wall; therefore, 2.4 GHz and 5 GHz signals are more likely to transmit on thin walls whereas 5 GHz and 5.8 GHz are less likely to transmit on thin walls.
Overall, if your walls are thick enough for wireless routers to NOT penetrate through them, then there is no way for all of the wireless router’s signal to be sent across it effectively. If you want your wireless internet router to work successfully with minimal interruptions, make sure your walls are thin enough for these frequencies (2.4 & 5GHz) to transmit/receive data on them.
How can I test if a wall works with my wireless devices?
The only way would be to physically purchase a WiFi router, bring it to your home and test the Wifi signal through the wall.
Wi-Fi signals vary due to a variety of factors and there are certain steps you can take to improve the wireless signal emitted.
Alongside this you need a good location for your wireless access point. Wi-Fi access points that are located too far away will supply a bad signal.
The worst types of walls are concrete or brick walls. These types of walls require high gain antennas to supply the Wifi connection through the wall.
Brick or concrete walls also may cause your wireless connection to drop often.
How do I get good signal strength through thick walls?
Some walls are hard to get good WiFi speeds through.
No matter if you use a dual band router, tri band router or the most expensive router you can find, the issues wil persist.
Electromagnetic waves simply struggle to penetrate through walls that are very thick.
Wireless signals and other radio waves will all struggle here, causing your internet connection to drop.
The only way around this is to use an ethernet cable.
This way you can have multiple connected devices and place secondary WiFi extenders on the other side of the wall.
This way you have wireless coverage throughout your entire home on both sides of the wall.