Frequency conversion device, method and system

A frequency conversion receiving device, comprising:

• a second duplexer, adapted to receive a microwave signal, and send the microwave signal after performing a band pass filtering on the microwave signal received;
• a second local oscillator, adapted to generate and send a local oscillator signal;
• a down frequency converter, adapted to receive the microwave signal after the band pass filtering and the local oscillator signal, perform a down frequency conversion on the microwave signal to obtain an intermediate frequency (IF) signal according to the local oscillator signal, and send the IF signal;
• and
• a second IF filter, adapted to receive the IF signal, perform an IF filtering on the IF signal received to obtain a filtered signal.

A frequency conversion sending method, comprising:

• receiving, by a first intermediate frequency (IF) filter, an IF signal, and sending the IF signal after performing an IF filtering on the IF signal;
• generating and sending, by a first local oscillator, a local oscillator signal;
• receiving, by an up frequency converter, the IF signal after the IF filtering and the local oscillator signal, performing an up frequency conversion on the IF signal to obtain a microwave signal according to the local oscillator signal, and sending the microwave signal;
• and
• receiving, by a first duplexer, the microwave signal, and sending the microwave signal after performing a band pass filtering on the microwave signal.

A frequency conversion receiving method, comprising:

• receiving, by a second duplexer, a microwave signal, and sending the microwave signal after performing a band pass filtering on the microwave signal;
• generating and sending, by a second local oscillator, a local oscillator signal;
• receiving, by a down frequency converter, the microwave signal after the band pass filtering and the local oscillator signal, performing a down frequency conversion on the microwave signal to obtain an intermediate frequency (IF) signal according to the local oscillator signal, and sending the IF signal;
• and
• receiving, by a second IF filter, the IF signal, performing an IF filtering on the IF signal to obtain a filtered signal.