Coaxial Cavity Duplexer is a microwave device used to separate and combine signals of different frequencies. The following is a detailed introduction about it:

Structural Features

• Coaxial Resonant Cavity:

It consists of an inner conductor and an outer conductor. The inner conductor is usually a metal cylinder, and the outer conductor is a metal cavity. The inner and outer conductors are filled with dielectric materials. The space formed between the inner and outer conductors constitutes a resonant cavity, which can support the resonance of electromagnetic waves of a specific frequency.

• Coupling Structure:

The coupling between each resonant cavity and the external circuit is achieved through coupling resonant windows, coupling rings or small holes. The design of the coupling structure is crucial to the performance of the duplexer, which determines the transmission efficiency and isolation of the signal between different resonant cavities.

• Input And Output Ports:

There are generally three ports, namely the common port, the transmitting port and the receiving port. The common port is used to connect the antenna, the transmitting port is connected to the transmitter, and the receiving port is connected to the receiver.