Multiplexer, radio frequency module, and electronic device

A multiplexer, configured to transmit a first signal and a second signal, wherein the first signal is a signal in a time-division duplex frequency band, and the second signal is a signal in a frequency-division duplex frequency band;

• and the multiplexer comprises:
• a first link, a second link, a third link, and a fourth link, wherein
• the first link comprises a first filter;
• a passband of the first filter is an uplink frequency band of the second signal;
• the second link comprises a second filter;
• a passband of the second filter is a downlink frequency band of the second signal;
• both the first link and the second link work on a first antenna through a first port;
• the first link is used to send the second signal;
• the second link is used to receive the second signal;
• the third link comprises a third filter;
• the fourth link comprises a fourth filter;
• a passband of the third filter and a passband of the fourth filter are frequency bands covered by the first signal;
• in a transmission slot of the first signal, the third link is connected to the first port, and the third link does not work;
• the fourth link sends the first signal through a second port, and the second port is different from the first port;
• in a receiving slot of the first signal, the third link works on the first antenna through the first port, to perform primary MIMO receiving of the first signal;
• and the fourth link performs primary receiving of the first signal through the second port.