A Wideband Active Quasi-Circulator With 34-dB Isolation and Insertion Loss of 2.5 dB

Tang, Bingjun; Gui, Xiaoyan; Xu, Jiangtao; Xia, Qing; Yang, Hongqiang; Geng, Li

doi:10.1109/lmwc.2020.2994338

Cited by 3 publications

(12 citation statements)

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“…To improve the isolation and bandwidth of the active quasi-circulator, the feedback technology [21] , the dual techno- In-phase path (0°) logy [24] and the advanced dual technology [25] are proposed and designed, successively.…”

Section: Wideband Active Quasi-circulatorsmentioning

confidence: 99%

“…Another cancellation signal (dual signal) is added in the dual structure, and the schematic of the dual interference-cancelling active quasi-circulator is shown in Fig. 6(c) [24] . The conventional active quasi-circulator with buffer is shown in Fig.…”

Section: Dual Technologymentioning

confidence: 99%

“…Signals obtained after passing the primary and dual circuits are identical, and they meet at port 3 through the in-phase source-follower M 3 and the anti-phase commonsource M 4 , respectively, with achieved higher isolation. Port 2d is terminated by a 50 Ω off-chip resistor to ensure symmetry and acts as a dummy port [24] .…”

Section: Dual Technologymentioning

confidence: 99%

“…On the contrary, the two terms in Eq. (3), C -D and E -F, achieve a much better cancellation versus frequency, given that the circuits represented by the two terms are almost identical [24] . Bandwidth and isolation can be simultaneously enhanced.…”

Section: Dual Technologymentioning

confidence: 99%

“…Due to the problem of large insertion loss and large noise figure of the dual active quasi-circulator [24] , an advanced dual structure active quasi-circulator based on the insertion loss and noise reduction technology is proposed [25] .…”

Section: Advanced Dual Technologymentioning

confidence: 99%

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A survey of active quasi-circulators

Tang¹,

Geng²

2020

J. Semicond.

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With the development of multi-band wireless communication and the increasing data transmission rate, the circulator as an antenna interface must be able to work in multiple frequency bands and provides large bandwidth. It presents a high challenge to the design of circulators, especially the active quasi-circulators. In this survey, we review the representative active quasi-circulators and summarize three different techniques and the corresponding structures to show an incremental improvement of the isolation and bandwidth of the active quasi-circulators. In addition, we also compare the performance of several state-of-art active circulators, and analyze their advantages and disadvantages. Finally, we conclude the future trend of the active quasi-circulators.

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Section: Wideband Active Quasi-circulatorsmentioning

confidence: 99%

Section: Dual Technologymentioning

confidence: 99%

Section: Dual Technologymentioning

confidence: 99%

Section: Dual Technologymentioning

confidence: 99%

Section: Advanced Dual Technologymentioning

confidence: 99%

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A survey of active quasi-circulators

Tang¹,

Geng²

2020

J. Semicond.

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Active quasi circulator: Comprehensive review and performance comparison

Hasan,

Chowdhury,

Zaman

2024

Engineering Reports

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Designing circulator as an antenna interface device becomes a daunting task, particularly active‐quasi circulator. This article focuses on demonstrating the basic operation principle, design methods, technical parameters, and performance metrics of active quasi‐circulator. In addition, the study provides an analogy of the circuits and structures proposed by the researchers to enhance certain performance metrics. Active signal cancellation and passive signal cancellation are identified as the major design approaches. Tunable, wideband, and wideband‐tunable are the major types of circulators found in existing literature. Moreover, this article provides a performance comparison of the active‐quasi circulators available in existing literature. Several active quasi‐circulators were able to operate in high frequencies such as 60 GHz with acceptable isolation levels. On the other hand, several designs have over 30 dB isolation, which is a highly desired parameter. At last, the future design challenges associated with active‐quasi circulators have been discussed to provide insight into future research.

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