Circular Resonator Band-Pass Filter Design
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Solution Overview
Problem
Designing band-pass filters (BPFs) with desired characteristics is challenging due to the numerous design parameters required for resonator shape and arrangement, necessitating significant experience and effort.
Innovation Solution
A BPF design featuring resonators with circular or regular polygon broad walls, where two coupled resonators are arranged such that the center-to-center distance is less than the sum of their radii, reducing the number of design parameters and enhancing symmetry, thereby simplifying the design process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional resonator shapes (baseball home plate or rectangle) and arrangements are used, then the filter can achieve desired characteristics, but the number of design parameters increases significantly, requiring much experience and effort to optimize
Solution Approach 1:
The patent applies homogeneity by making all resonators identical in shape (circle or regular polygon) and size, with uniform spacing between them. This eliminates the need to optimize different resonator shapes and sizes, reducing the number of design parameters while maintaining filter performance through consistent electromagnetic coupling characteristics across all resonator pairs.
Solution Approach 2:
The patent employs asymmetry by arranging resonators in a circular pattern rather than linear or symmetric configurations. This circular arrangement with specific spacing creates asymmetric coupling paths that simplify the overall design while achieving desired filter characteristics, reducing the complexity of parameter optimization.
2Device complexity
If resonators are arranged with larger spacing to reduce coupling effects, then design optimization becomes simpler, but the total length of the filter increases
Solution Approach 1:
The patent transitions from linear arrangement of resonators to a circular/cyclic arrangement in two dimensions. This dimensional change allows resonators to be spaced evenly around a circle, achieving appropriate coupling distances without increasing the overall filter length, as the resonators are distributed around a compact circular path rather than extending linearly.
3Length of stationary object
If resonators are arranged in compact configuration to reduce filter length, then space is saved, but stability against thermal changes decreases
Solution Approach 1:
The patent applies local quality by ensuring that each resonator pair maintains identical local spacing and coupling characteristics in the circular arrangement. This uniform local geometry throughout the structure ensures consistent thermal expansion behavior across all resonators, maintaining thermal stability while achieving compact overall dimensions through the efficient circular layout.
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 approach allows for easier design of filters with desired characteristics, reduces the total length of the filter, and enhances stability against thermal changes, while maintaining effective electromagnetic coupling and reducing return loss.
Implementation Method 1
a plurality of resonators which are electromagnetically coupled, two resonators, which are coupled together, of the plurality of resonators being arranged such that D<R1+R2 is satisfied
Data Source
AI summary
Designing a filter with desired characteristics is made easy. A filter (1) includes a plurality of resonators (10 to 50) which are electromagnetically coupled. The plurality of resonators (10 to 50) each have a broad wall (11, 12, 21, 22, 31, 32, 41, 42, 51, 52) that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the plurality of resonators (10 to 50) are arranged such that D<R1+R2 is satisfied, where R1 and R2 represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.