Microstripline Resonator with Segmented Lines for High Power
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Solution Overview
Problem
Microwave resonators with microstripline structures face challenges in achieving high power handling capability and high Q values due to current concentration at edge portions, leading to increased conductor loss and reduced Q values, especially when using superconducting materials where conductor loss is not the dominant factor.
Innovation Solution
The design incorporates multiple resonance lines with current standing waves and connection lines that connect them at in-phase nodes, distributing current flow in opposite directions to reduce radiation loss and enhance Q values, utilizing superconductive materials for conductors and low-loss dielectric materials like sapphire for substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional microstripline resonators are used with simple line structures, then the device complexity is low, but the power handling capability is limited due to current concentration at edge portions
Solution Approach 1:
The resonator is divided into multiple parallel resonance lines (first, second, third resonance lines) instead of using a single line structure. Each resonance line carries a portion of the total current, segmenting the current flow to reduce concentration at any single edge portion. This segmentation allows the resonator to handle higher power while maintaining a relatively simple overall structure.
2Device complexity
If conventional microstripline resonators are used, then the structure is simple, but the Q value is reduced due to increased conductor loss from current concentration
Solution Approach 1:
The resonator structure is segmented into multiple parallel resonance lines, which distributes the current flow and reduces the effective current density at any single edge portion. This segmentation reduces conductor loss by minimizing the impact of current concentration, thereby improving the Q value while maintaining a simple overall resonator structure.
3Power
If multiple resonance lines are used to distribute current, then power handling capability is improved, but the device complexity increases
Solution Approach 1:
Multiple resonance lines are merged into a single integrated resonator structure with shared connection lines and a common ground plate. The first, second, and third resonance lines are electrically connected at their ends through connection lines, forming a unified resonant system. This merging approach allows current distribution across multiple lines (improving power handling) while maintaining a compact, integrated structure (limiting complexity increase).
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
This configuration significantly improves power handling capability and achieves high Q values, with the resonator demonstrating power handling of up to 26 W and a Q value of 55000, surpassing conventional designs by reducing radiation loss and maintaining low-loss characteristics.
Implementation Method 1
resonance lines in which current standing waves are generated in a resonant state in a line
Implementation Method 2
current standing waves are generated in a resonant state in a line
Implementation Method 3
connection line that connects the resonance lines at the portions that have in-phase voltages among the nodes of the current standing waves
Data Source
AI summary
The present invention provides a resonator and a filter that reduce the resonator radiation loss so as to achieve a high Q value that is inherent to a low-loss material while maintaining high power handling capability. In this manner, both high power handling capability and a high Q value can be achieved at the same time. The resonator is a microstripline structure and includes a line structure formed with resonance lines in which current standing waves are generated in a resonant state in a line, and currents in each two adjacent lines flow in the opposite directions from each other, and a connection line that connects the resonance lines at the portions having in-phase voltages among the nodes of the current standing waves of the resonance lines in the resonant state. The filter includes resonators of the same type as the above resonator.