Why can't I find my wireless router signal?

People who use wireless networks will encounter problems that cannot find the wireless router signal. I have also encountered this problem before, the wireless network card of the notebook can search for others' signals but cannot find their own router signals. The specific situation and solution are as follows:
 
1. Try to borrow another wireless network card to check whether the wireless signal of the router can be found and whether the router is faulty.
 
2. Some wireless NICs may not support the 12 and 13 frequency bands. Modify the frequency band of the wireless signal to view the signal within 1 to 11.
 
3. When the wireless router is enabled, the wireless WLAN indicator lights are constantly flashing. The cable enters the router management interface and confirms whether the wireless function is enabled.
 
4. The final killer is to restore the wireless router to the factory settings and then re-search.
 
5. Adjust the location of the wireless router or wireless network card to avoid the signal blind zone of the wireless network card in the router.
 
If you cannot find your own router signal, you can try the above situations. There is definitely a solution.