可以买一对Power line adapter....

比如

http://www.newegg.com/Product/Product.aspx?Item=N82E16833704200&cm_re=power_line_networking_adapter-_-33-704-200-_-Product

http://www.newegg.com/Product/Product.aspx?Item=N82E16833181529&cm_re=power_line_networking_adapter-_-33-181-529-_-Product

 

一头接router，另一头接各种设备，包括Wifi Access Point