A Wideband Quasi-Circulator with Low NF and High P<sub>1dB</sub> Using Noise-Canceling Technique

Chen, Wen; Shu, Yiyang; Deng, Zhixian; Qian, Huizhen Jenny; Luo, Xun

doi:10.1109/mwsym.2019.8700835

2019 IEEE MTT-S International Microwave Symposium (IMS) 2019

DOI: 10.1109/mwsym.2019.8700835

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A Wideband Quasi-Circulator with Low NF and High P_1dB Using Noise-Canceling Technique

Wen Chen

Yiyang Shu

Zhixian Deng

et al.

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“…For more information, see https://creativecommons.org/licenses/by/4.0/ As depicted in Fig. 1(b), a wideband QC with the low RX NF and high 1-dB compression point (P 1 dB ) is proposed in our conference article [26]. Such QC utilizes a nonreciprocal network connecting to a 180 • hybrid to achieve the ANT-TX reverse isolation instead of using an amplifier.…”

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“…Compared to the previous work in [26], a deep analysis using the power transmission method is proposed and the simplified model of the architecture is extracted in this article. Based on the theoretical analysis, a reconfigurable inter-stage matching network and a step-impedance 180 • hybrid are utilized to further improve the TX-RX isolation and the operation bandwidth, respectively.…”

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Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

Chen

Deng

Shu

et al. 2021

IEEE Trans. Microwave Theory Techn.

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In this article, a wideband quasi-circulator (QC) with the low noise figure (NF) and high 1-dB compression point (P 1 dB ) is proposed. The slotline-based 180 • hybrid is introduced to achieve the wideband high transmitter-receiver (TX-RX) isolation. Meanwhile, the bidirectional in-phase stage and the nonreciprocal out-of-phase stage are utilized to obtain specific power-split ratios for the low insertion loss and high antenna-transmitter (ANT-TX) isolation. By using the unequal power split, the proposed QC is without the fundamental 3-dB loss seen in reciprocal ANT interfaces. Besides, to further enhance the TX-RX isolation within a wideband, a reconfigurable inter-stage matching network based on a varactor-tuned capacitor is implemented. To verify the mechanisms mentioned above, a reconfigurable wideband QC operating at 1.75-2.9 GHz is implemented and fabricated. The total power consumption is 224 mW. The measurement exhibits in-band TX-RX isolation of 27-58 dB. The TX-ANT and ANT-RX insertion losses are 4.3-5.0 dB and 1.0-1.9 dB, respectively. The QC also achieves the minimum in-band ANT-RX NF of 3.4 dB. Meanwhile, the measured TX-ANT and ANT-RX IIP3s are 39.4 and 32.5 dBm, respectively. The TX input P 1 dB is greater than 28.78 dBm, while the RX input P 1 dB is 23 dBm. The TX-induced ANT-RX P 1 dB is measured to be 28 dBm. Index Terms-180 • hybrid full-duplex (FD), quasi-circulator (QC), reconfigurable circuits, wideband. I. INTRODUCTIONW ITH the ever-increasing demand for high data rates in modern wireless communications, there are urgent requirements of wireless channels with large capacity and high spectral efficiency in recent years. To satisfy the practical requirements, either time or frequency division duplexing systems are employed [1], [2]. However, all these systems are exclusively half-duplex, which limits the maximum transmission rate to only half of the network capacity. For this reason, the full-duplex (FD) system is introduced to double the Manuscript

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Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

Chen

Deng

Shu

et al. 2021

IEEE Trans. Microwave Theory Techn.

Self Cite

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A Wideband Quasi-Circulator with Low NF and High P_1dB Using Noise-Canceling Technique

Cited by 1 publication

References 7 publications

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

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A Wideband Quasi-Circulator with Low NF and High P1dB Using Noise-Canceling Technique

Cited by 1 publication

References 7 publications

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

Low NF and High P1dB Wideband Quasi-Circulator With Unequal Power Split and Reconfigurable Inter-Stage Matching

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A Wideband Quasi-Circulator with Low NF and High P_1dB Using Noise-Canceling Technique