Narrowband Filter With Mixed-Order Resonators
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Solution Overview
Problem
Conventional microwave filters face challenges in achieving small size while maintaining high-quality performance and minimizing undesired re-entrant resonant frequencies, especially in narrow-band applications, where high-temperature superconductor materials can saturate and introduce non-linearities at high power levels.
Innovation Solution
A narrowband filter design that incorporates a primary set of resonators tuned at a higher order resonant frequency and a secondary set tuned at a lower order resonant frequency, both composed of high-temperature superconductor material, to increase power handling and attenuate undesirable resonant frequencies, thereby enhancing out-of-band rejection and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high-temperature superconductor materials are used in resonators to achieve small size and high selectivity, then filter size and resonator Q are improved, but power handling capability deteriorates due to material saturation and non-linearities at high power levels
Solution Approach 1:
The filter is divided into two distinct sets of resonators: first resonators made of high-temperature superconductor material for size reduction and high Q, and second resonators made of normal conductor material for power handling. This segmentation allows each set to optimize for its specific function without compromise.
Solution Approach 2:
Different materials with different properties are assigned to different parts of the filter system. The first resonators use superconductor material where high Q and small size are critical, while the second resonators use normal conductor material where power handling is critical. Each local region has the quality needed for its specific role.
2Manufacturing precision
If conventional filter designs use resonators with low internal resistance to achieve sharp and highly selective response, then filter selectivity is improved, but resonator size and cost increase
Solution Approach 1:
The invention changes the material parameter (electrical conductivity) of the resonators by using high-temperature superconductor material, which has extremely low internal resistance. This parameter change enables achieving high selectivity with significantly reduced resonator size compared to conventional materials.
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 filter achieves increased power handling with minimal undesired re-entrant resonant frequencies, improving receiver sensitivity and reducing interference, while maintaining a sharp and selective frequency response.
Implementation Method 1
a plurality of resonators coupled in cascade between the input terminal and the output terminal. Each of the resonators is tuned at a resonant frequency substantially equal to the center frequency
Implementation Method 2
Each of the resonators may comprise planar structure, such as a microstrip structure, and may comprise a transmission line composed of high temperature superconductor (HTS) material
Data Source
AI summary
A narrowband filter tuned at a center frequency. The filter comprises an input terminal, an output terminal, and a plurality of resonators coupled in cascade between the input terminal and the output terminal. Each of the resonators is tuned at a resonant frequency substantially equal to the center frequency. The resonant frequencies of a primary set of the resonators and a secondary set of the resonators are of different orders.