Bingjun Tang, Li Geng. A survey of active quasi-circulators[J]. Journal of Semiconductors, 2020, 41(11): 111406
- Journal of Semiconductors
- Vol. 41, Issue 11, 111406 (2020)
Fig. 1. Diagrams showing the S -parameter matrix of (a) an ideal circulator and (b) a quasi-circulator.
Fig. 2. (Color online) (a) Active quasi-circulator based on phase cancellation. (b) Core of conventional active quasi-circulator.
Fig. 3. (Color online) (a) Active quasi-circulator with a tunable capacitor. (b) Isolation S 31 varies with frequency. (c) Schematic of a tunable distributed active quasi-circulator.
Fig. 4. (Color online) (a) Tunable active quasi-circulator with T-network phase shifters. (b) Schematic of the tunable active quasi-circulator by using DAs.
Fig. 5. (Color online) (a) Active quasi-circulator with feedback technology. (b) Core circuit of feedback active quasi-circulator.
Fig. 6. (Color online) (a) Active quasi-circulator with dual technology. (a) Architecture of conventional active quasi-circulator. (b) Schematic of dual interference-cancelling active circulator.
Fig. 7. (Color online) Architecture of advanced dual interference-cancelling active circulator.
Fig. 8. (Color online) (a) LPTV active quasi-circulator. (b) Three-port circulator with a 3λ/4 transmission-line ring.
Fig. 9. Bandwidth and isolation behaviors of state of art active quasi-circulators.
Fig. 10. Linearity behaviors of state of art active quasi-circulators.
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Table 1. Comparison with published active quasi-circulators.
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