A.Data Frame

B.management frames

C.Control Frame

D.empty data frame

A.Encryption type

B.Channel

C.SSID

D.MAC address

A.dB

B.dBi

C.dBm

D.dBw

A.Remote control

B.Bluetooth transmission equipment

C.Microwave oven

D.Cordless phone

A.Equipment using low standing wave ratio

B.Using high efficiency antenna feeders

C.Make the antenna radiation more concentrated

D.Using a power amplifier in an antenna system