Journal ArticleDOI
A Broadband Active Quasi Circulator for UHF and L Band Applications
Debapratim Ghosh,Girish Kumar +1 more
TLDR
In this paper, a three-port MMIC-based quasi-circulator for UHF and L bands is presented, which uses differential amplifier and lossy broadband combiner to obtain effective phase cancellation for high directivity.Abstract:
This letter presents a compact, broadband three-port MMIC-based quasi circulator for UHF and L bands. As a motivation and application, the use of this circuit in a network analyzer is presented. The circuit is designed using differential amplifier and lossy broadband combiner to obtain effective phase cancellation for high directivity. The designed quasi circulator has return losses at all ports better than 10 dB and reverse isolation above 30 dB in the frequency range from 0.2 to 2.5 GHz. The quasi circulator has directivity of 15 to 52 dB and load dynamic range of 10 to 49 dB, over the 0.2 to 1.7 GHz band. The proposed circuit thus can be used in portable network analyzers and other applications designed for the UHF and L bands.read more
Citations
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Journal ArticleDOI
A Wideband, Unidirectional Circularly Polarized Antenna for Full-Duplex Applications
Jie Wu,Mingjian Li,Nader Behdad +2 more
TL;DR: In this article, a planar unidirectional circularly polarized (CP) antenna with simultaneous transmit and receive (STAR) capability is presented for full-duplex applications.
Journal ArticleDOI
Active Three-Way Circulator Using Transistor Feedback Network
Steve W. Y. Mung,Wing Shing Chan +1 more
TL;DR: In this paper, the authors presented an active three-way circulator with both theoretical analyzes and experimental verifications, which is formed by three 2-port transistor feedback networks (TFNs).
Journal ArticleDOI
The Challenge of Active Circulators: Design and Optimization in Future Wireless Communication
Steve W. Y. Mung,Wing Shing Chan +1 more
TL;DR: In this paper, the lumped-element Y circulator uses ferrite and has a mesh mechanism in place of the ordinary strip-line circulator?s center conductor, which has higher power-handling characteristics and is simpler to construct.
Journal ArticleDOI
A survey of active quasi-circulators
Bingjun Tang,Li Geng +1 more
TL;DR: This survey reviews the representative active quasi-circulators and summarizes three different techniques and the corresponding structures to show an incremental improvement of the isolation and bandwidth of the active quasi -circulators.
References
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Journal ArticleDOI
Double balanced mixers using active and passive techniques
TL;DR: A variety of microwave double-balanced mixers, using dual-gate FETs or diodes as the mixing nonlinearities, have been fabricated in planar monolithic circuit technology.
Journal ArticleDOI
MMIC-Based Quadrature Hybrid Quasi-Circulators for Simultaneous Transmit and Receive
TL;DR: In this paper, a new type of monolithic microwave integrated circuit (MMIC)-based active quasi-circulator using phase cancellation and combination techniques for simultaneous transmit and receive (STAR) phasedarray applications is presented.
Journal ArticleDOI
Novel Active Quasi-Circulator With Phase Compensation Technique
Steve W. Y. Mung,Wing Shing Chan +1 more
TL;DR: In this paper, a novel active quasi-circulator using phase compensation technique for wideband isolation is proposed, which is formed by configuring three transistors with a complimenting phase shifter for equalization.
Proceedings ArticleDOI
A novel hybrid active quasi-circulator for L-band applications
TL;DR: In this article, a hybrid active quasi-circulator operating in L-band is presented, which is composed by active non-reciprocal phase shifters and classical passive combining structures.
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