Recessed-Substrate Filter Layout for Compact Electromagnetic Coupling
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Solution Overview
Problem
Existing filter devices are required to be further reduced in size while maintaining electromagnetic coupling between strip-shaped conductors.
Innovation Solution
Incorporating recessed portions on the substrate surface that overlap with strip-shaped conductors and are covered by a ground conductor layer, reducing the distance between conductors and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If recessed portions are provided in areas of the substrate that do not overlap the strip-shaped conductors, then the degree of electromagnetic coupling between adjacent strip-shaped conductors is reduced, but the distance between adjacent strip-shaped conductors must be maintained, preventing further size reduction
Solution Approach 1:
The invention transitions from a two-dimensional planar arrangement to a three-dimensional structure by providing recessed portions that overlap the strip-shaped conductors in the vertical dimension. This allows the ground conductor layer to be positioned closer to the strip-shaped conductors without increasing planar footprint, thereby reducing the overall device volume while maintaining electromagnetic coupling characteristics
Solution Approach 2:
The recessed portions are formed within the substrate volume and overlap the strip-shaped conductors, creating a nested configuration where the ground conductor layer is positioned within the vertical space above the substrate. This nesting approach allows compact integration without requiring additional lateral space, enabling further size reduction
2Volume of moving object
If the distance between adjacent strip-shaped conductors is reduced to decrease filter device size, then the device can be miniaturized, but the degree of electromagnetic coupling changes, affecting filter performance
Solution Approach 1:
The invention changes the geometric parameters of the substrate structure by introducing recessed portions with specific depths and dimensions. By adjusting the depth and size of these recessed portions, the electromagnetic coupling can be precisely controlled to maintain filter performance while enabling reduced distance between conductors for miniaturization
Solution Approach 2:
The recessed portions are strategically positioned to overlap specific regions of the strip-shaped conductors, creating localized variations in the electromagnetic field distribution. This local modification allows precise control of coupling characteristics in specific areas while maintaining overall filter performance, enabling size reduction without compromising reliability
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 device achieves a reduction in size without compromising electromagnetic coupling, enabling smaller form factors.
Implementation Method 1
adjacent ones of which are electromagnetically coupled to each other
Data Source
AI summary
An object of this invention is to reduce the size of a filter device. Provided is a filter device (1) including: a substrate (11) including a first main surface and a second main surface (111, 112); strip-shaped conductors (12a1 to 12a5) provided to the first main surface (111); and a ground conductor layer (13) provided at least to the second main surface (112), the second main surface (112) having a recessed portion (11ai) provided for each strip-shaped conductor (12ai), the recessed portion (11ai) overlapping the strip-shaped conductor (12ai) in plan view and having a surface covered with the ground conductor layer (13).