Band-Pass Filter Shield Layout for Stacking Misalignment Tolerance
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Solution Overview
Problem
The misalignment of ceramic green sheets during the stacking process in the manufacturing of band-pass filters leads to deviations in the intervals between conductor layers and through holes, resulting in undesirable filter characteristics.
Innovation Solution
A filter design incorporating a stack of dielectric layers with integrated resonators and a shield formed by conductor layers and columnar conductors, which are arranged to maintain precise spacing and electromagnetic coupling, thereby stabilizing the filter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple ceramic green sheets are stacked together to form a compact filter structure, then miniaturization is achieved, but misalignment between sheets causes deviation in intervals between conductor layers and through holes, degrading filter characteristics
Solution Approach 1:
The patent applies preliminary action by pre-positioning the resonator conductor layer at a specific offset from the center of the through hole in the design stage. This intentional preliminary misalignment compensates for the expected misalignment that occurs during the stacking of ceramic green sheets, ensuring that even when manufacturing deviations occur, the final interval between the conductor layer and through hole remains within acceptable tolerances, thus maintaining filter characteristics while enabling miniaturization
2Ease of manufacture
If the interval between conductor layer and through hole deviates from design value due to stacking misalignment, then manufacturing becomes more tolerant, but desired filter characteristics cannot be obtained
Solution Approach 1:
The patent applies parameter changes by modifying the positional parameter of the resonator conductor layer, specifically setting it at a predetermined offset from the through hole center rather than at the center. This parameter adjustment creates a design that is inherently more tolerant to stacking misalignments, allowing easier manufacturing while maintaining reliable filter characteristics through the compensated positioning
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 proposed design effectively suppresses changes in filter characteristics due to manufacturing misalignments, ensuring consistent performance and miniaturization of band-pass filters.
Implementation Method 1
a plurality of resonators being provided in the stack and being provided between the first input/output terminal and the second input/output terminal in a circuit configuration
Implementation Method 2
In order to prevent radiation of an electro-magnetic wave to the surrounding area, some band-pass filters have a structure in which a plurality of resonators are surrounded by a shield
Data Source
AI summary
A filter includes a first resonator, a second resonator, and a third resonator provided between the first resonator and the second resonator in a circuit configuration, and the third resonator includes a first resonator conductor layer. A plurality of columnar conductors of a shield of the filter include two specific first columnar conductors arranged at a first interval and two specific second columnar conductors arranged at a second interval. A stack includes a first dielectric part located between the two specific first columnar conductors and a second dielectric part located between the two specific second columnar conductors. At least one of a first line part and a second line part of the first resonator conductor layer is arranged at a position closer to the second dielectric part than the first dielectric part.