New types of MMIC circulators

Kother, D.; Hopf, B.; Sporkmann, T.; Wolff, I.; Kosslowski, S.

doi:10.1109/mcs.1995.470951

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…This technique is illustrated in Figure 4. 70 In multiband systems, there has been significant research conducted on the use of passive components like duplexers, power dividers, and directional couplers. Quasi-circulator function can be achieved by using a combination of active components with passive components such as coupler, 27 Wilkinson power divider, [70][71][72] and so forth.…”

Section: Passive Signal Cancellationmentioning

confidence: 99%

“…70 In multiband systems, there has been significant research conducted on the use of passive components like duplexers, power dividers, and directional couplers. Quasi-circulator function can be achieved by using a combination of active components with passive components such as coupler, 27 Wilkinson power divider, [70][71][72] and so forth. Amplifiers (Power Amplifier and Low-Noise Amplifier) are used in quasi-circulator employing passive signal cancellation method to block signal transmission from RX to ANT and ANT to TX.…”

Section: Passive Signal Cancellationmentioning

confidence: 99%

“…The method in which quasi‐circulators utilize a passive power coupler or divider along with two amplifiers is referred to as passive cancellation. This technique is illustrated in Figure 4 70 . In multiband systems, there has been significant research conducted on the use of passive components like duplexers, power dividers, and directional couplers.…”

Section: Theory and Principle Of Operationmentioning

confidence: 99%

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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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