To provide a compact, low-cost and easy-manufacturable relay device which relays a wireless WAN system and a wireless LAN system, and to provide an external antenna unit.
In a communication system, the relay device has a first antenna unit which transmits and receives wireless signals in a first frequency band; a second antenna unit which transmits and receives wireless signals in a second frequency band; a first signal processing board which performs wireless communication via the first antenna unit; a second signal processing board which performs wireless communication via the second antenna unit; and a connector which connects the first and the second signal processing boards and relays wireless signals in the first and the second frequency bands. The second antenna unit has an antenna element that receives wireless signals in the second frequency band, and a filter which controls interference signals in a specified frequency band which are included in the wireless signals. The second antenna unit is provided removably from the second signal processing board.
IKEBE HAYATO
Keishin Terayama
Hiroyuki Miyoshi