TMTT-Single-chain Six-port Transceiver Front End With Dual-in-band Full-duplex Capability

The increasing demand for high-speed wireless communication necessitates front ends that combine high spectral efficiency with multiband operation. Integrating in-band full-duplex (IBFD) and carrier aggregation (CA) technologies becomes crucial but is hindered by the complexity and cost of duplicating transmit and receive chains across bands. In this work, we present a single-chain six-port transceiver architecture enabling dual-in-band full-duplex (DIBFD) operation to eliminate replicated chains. By leveraging the common-mode (CM) and differential-mode (DM) orthogonality between transmitted and received signals in intermediate frequency spectra, the design dramatically simplifies hardware and reduces local oscillator requirements. Calibration algorithms, combined with digital self-interference cancellation, are deployed to optimize performance. Compared to traditional solutions, this architecture achieves wide bandwidth, strong self-interference suppression, and dual-band operation with lower complexity and cost. This approach paves the way for more efficient multiband, full-duplex wireless systems critical for meeting future data-intensive communication demands.