In a fifth-generation mobile communication system (referred to as 5G), such a technical demand is proposed as a rate of gigabits per second (
Gbps) or higher in a downlink direction and a rate of tens of megabits per second (Mbps) or higher in an uplink direction. In order to achieve such a high rate, a frequency band of a radio wave used in the 5G system is required to be wide.
In the