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本文提出了一种基于N-path混频器的宽带混合耦合器环形器天线接口，实现了全双工通信中的低噪声自干扰消除。该设计在0.55-0.9GHz频率范围内达到2.7dB的噪声系数和40dB的发射自干扰抑制，提升了频谱效率。
Simultaneous transmit-and-receive (STAR) radios enable higher spectrum efficiency and dynamic spectrum access. The integration of a shared antenna interface is attractive for small system formfactor and MIMO channel estimation and has led to demonstrations of compact reciprocal (electrical balance duplexers (EBD)) and nonreciprocal (circulator) interfaces with self-interference cancellation (SIC) [1-5]. In this paper, we address the challenge of low-noise wideband SIC by demonstrating a wideband hybrid-coupler-circulator antenna interface using N-path mixers that achieves low NF while preserving the linearity of passive-mixer-first RX. The 0.55-to-0.9GHz hybrid-coupler-based circulator-RX achieves 2.7dB NF at 750MHz with +14dBm OOB IIP3 as part of an antenna interface that achieves 2.6-to-4.1dB TX→ANT insertion loss (IL) from 550 to 900MHz. The wideband coupler approach provides >40dB TX-to-RX
Sanket Jain, Abhishek Agrawal, Manoj Johnson, Arun Natarajan
Oregon State University, Corvallis, OR