Multilayer Resonator Layout for Compact Band-Pass Filters
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Solution Overview
Problem
Existing band-pass filters with resonators formed of distributed constant lines face challenges in miniaturization, particularly in reducing the area required for arranging the resonators.
Innovation Solution
A multilayered filter device is designed with a stack of dielectric layers and integrated resonators, where each resonator includes a first conductor part and a second conductor part with a smaller impedance, arranged differently in the stacking direction to minimize space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resonator is formed of a distributed constant line, then the resonator can be constructed with simple transmission lines, but the area required for arranging the resonator increases
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration. Multiple resonators are arranged in different layers along the stacking direction, with conductor parts positioned at different heights. This vertical dimensionality change allows resonators to occupy overlapping horizontal spaces while maintaining electrical isolation through dielectric layers, thereby reducing the footprint area without complicating the transmission line construction.
Solution Approach 2:
The patent implements a nested structure where conductor parts of different resonators are positioned at different vertical levels within a stacked dielectric configuration. The first conductor part and second conductor part are arranged at different positions in the stacking direction, creating a nested spatial arrangement that allows multiple resonators to share the same horizontal footprint while maintaining independent electrical paths.
2Area of stationary object
If the resonator area is reduced for miniaturization, then the device compactness improves, but the filtering performance may be compromised
Solution Approach 1:
By utilizing the stacking direction as an additional dimension for resonator arrangement, the patent maintains the electrical length and resonant characteristics of each resonator while reducing the horizontal footprint. The distributed constant lines retain their required lengths along the vertical axis, ensuring filtering performance is preserved even as the device footprint is minimized.
Solution Approach 2:
The patent assigns different impedance characteristics to conductor parts at different vertical positions. The first conductor part and second conductor part have different impedances, allowing each resonator to be optimized for its specific function while maintaining overall filtering performance. This local differentiation enables compact arrangement without sacrificing the resonant properties needed for effective filtering.
Data Source
AI summary
A filter device includes a stack including a plurality of dielectric layers stacked together, and first to third resonators integrated with the stack. Each of the first to third resonators includes a first conductor part and a second conductor part electrically connected to the first conductor part and having an impedance smaller than an impedance of the first conductor part. The first conductor part and the second conductor part are arranged at positions different from each other in a stacking direction.