Embodiments of this application disclose a signal transceiver apparatus, a feeding structure, and an antenna. The signal transceiver apparatus includes: a first cavity, where a first interface is disposed on the first cavity; a first filter circuit, disposed in the first cavity, where a first end of the first filter circuit is connected to the first interface; a second cavity, where a second interface and a third interface are disposed on the second cavity; a second filter circuit, disposed in the second cavity, where a first end of the second filter circuit is connected to the second interface; and a connecting component, where the connecting component includes a first end and a second end opposite to each other and a third end, the first end of the connecting component is connected to a second end of the first filter circuit, the third end of the connecting component is connected to a second end of the second filter circuit, and the second end of the connecting component is connected to the third interface; and the connecting component is configured to transmit signals of a first frequency band and a second frequency band. The connecting component uses an integrated structure. This reduces an assembly tolerance and improves passive intermodulation performance of the signal transceiver apparatus.