Tunable High Isolation Circulator Using Segmented Signal Paths
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Solution Overview
Problem
Microwave circulators suffer from incomplete port isolation, leading to signal leakage and degradation in performance, particularly in radar and communication systems, where reducing leakage is essential for enhancing signal detection and dynamic range.
Innovation Solution
A system comprising power splitters, circulators, and phase trimmers is used to improve port isolation by injecting a desired frequency signal, observing its strength, and adjusting the trimmers to achieve maximum attenuation, thereby minimizing reflections and leakage between ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional circulator design is used, then device complexity is low, but port isolation is insufficient leading to signal leakage
Solution Approach 1:
The system divides the signal path into multiple segments by using two circulators instead of one, with each circulator handling a portion of the signal processing. This segmentation allows for improved isolation performance while maintaining manageable complexity through modular architecture
Solution Approach 2:
A power splitter and power combiner are introduced as intermediary components between the two circulators. These intermediaries enable the system to achieve superior port isolation by distributing and recombining signals in a way that cancels leakage paths, without requiring complete redesign of the circulator itself
2Measurement precision
If port isolation is improved to reduce leakage, then signal detection performance is enhanced, but device complexity increases
Solution Approach 1:
The system incorporates adjustable trimmers that enable feedback tuning of the signal paths. By adjusting the trimmers, the system can optimize the cancellation of leakage signals, thereby improving signal detection precision while allowing for post-manufacturing calibration to achieve optimal performance
Solution Approach 2:
The power splitter and power combiner merge multiple signal paths in a controlled manner. This merging approach allows the system to achieve improved signal detection by combining the outputs of two circulators in a way that enhances isolation while keeping the overall structure integrated and manageable
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves significantly improved port isolation, reducing leakage to approximately -70 dB, compared to the -25 dB of traditional circulators, resulting in cleaner signals and enhanced performance across various frequency ranges.
Implementation Method 1
a three-port device formed by a symmetrical Y junction coupled to magnetically biased ferrite material
Implementation Method 2
magnetically biased ferrite material
Data Source
AI summary
A system for improving port isolation of a three port circulator device includes a power splitter having a power splitter input and two power splitter outputs. A first circulator has a first circulator first port, a first circulator second port, and a first circulator third port, and the first circulator first port is electrically coupled to the first of the two power splitter outputs. A second circulator has a second circulator first port, a second circulator second port, and a second circulator third port, and the second circulator first port is electrically coupled to the second of the two power splitter outputs. A first trimmer is electrically coupled to the first circulator third port and a second trimmer is electrically coupled to the second circulator third port. The system further includes a power combiner having two power combiner inputs and one power combiner output, and the first of the two power combiner inputs is electrically coupled to the first trimmer and the second of the two power combiner inputs is electrically coupled to the second trimmer.