Wideband Active Quasi-Circulator for RF Isolation
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Solution Overview
Problem
Conventional circulators and quasi-circulators are bulky, have a narrow frequency range, and inadequate port isolation, making them impractical for wireless communication devices, which also rely on numerous internal components increasing size, weight, and cost.
Innovation Solution
A wideband active quasi-circulator with distributed amplifiers for power and low noise amplification, compatible with monolithic microwave integrated circuit technology, providing tunable isolation and replacing bulky ferrite circulators, enabling compact, lightweight designs for multi-band RF communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ferrite circulators are used, then port isolation is achieved, but the device becomes bulky and has narrow bandwidth
Solution Approach 1:
The patent replaces conventional ferrite-based mechanical circulator structures with an active electronic implementation using distributed amplifiers and signal cancellation circuits. This substitution enables compact integration while maintaining isolation through electronic control mechanisms rather than bulky ferrite materials.
Solution Approach 2:
The invention changes the operating parameters by using active distributed amplifiers with tunable characteristics to achieve wideband operation. The signal cancellation mechanism dynamically adjusts parameters across frequency bands to maintain isolation performance throughout the wide operating range, unlike narrowband ferrite circulators.
2Volume of moving object
If conventional circulators are miniaturized, then device size is reduced, but bandwidth becomes narrow and isolation deteriorates
Solution Approach 1:
The patent employs dynamic signal cancellation mechanisms where the first distributed amplifier actively adjusts its output to cancel signals across the wide frequency range. This dynamic adaptation allows the compact device to maintain wide bandwidth and proper isolation characteristics across multiple frequency bands.
Solution Approach 2:
The active quasi-circulator implementation provides multi-band operation capability within a single compact device. The distributed amplifier configuration and signal cancellation approach enable the device to function across wide frequency ranges, replacing multiple narrowband components with one universal solution.
3Adaptability or versatility
If multiple internal components are used for RF functions, then functionality is achieved, but device size, weight, and cost increase
Solution Approach 1:
The patent merges multiple RF functions (circulation, isolation, amplification, and signal cancellation) into a single integrated active quasi-circulator device. The combination of distributed amplifiers and signal cancellation circuits in one unit replaces what would traditionally require separate components, reducing overall device complexity while maintaining full RF functionality.
Data Source
AI summary
Aspects describe a wideband active quasi-circulator that has the advantages of small size, lightweight, and compatibility with monolithic microwave integrated circuit (MMIC) technology. An active quasi-circulator is provided that comprises both a power amplifier and a low noise amplifier. The active quasi-circulator can operate over a wide frequency range with isolation or substantial isolation between a power amplifier and a low noise amplifier that is tunable with isolation or substantial isolation at any frequency within the wide frequency range. The provided quasi-circulator is suitable for use in mobile units in multi-band radio frequency communication systems, as well as in other configurations.