Coaxial mmWave LC Filter Layout for Compact Inductive Coupling
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Solution Overview
Problem
Existing millimeter-wave (mmWave) band LC filters face challenges in achieving high performance and compact size, especially in the mmWave band where filters require efficient frequency selection and rejection.
Innovation Solution
The proposed mmWave band LC filter incorporates a coaxial resonator-type design with a pin at the center of a space surrounded by a via wall, and includes bridges interconnecting pins to enhance inductive coupling, thereby optimizing filter performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter structures are used in mmWave band, then basic filtering function is achieved, but filter performance and compact size cannot be simultaneously optimized
Solution Approach 1:
The patent implements a nested structure where the pin is positioned at the center of the space surrounded by the via wall, creating a compact coaxial resonator configuration. This nesting approach allows multiple functional elements (pin, via wall, resonance space) to occupy overlapping spatial volumes, achieving high performance in a compact form factor suitable for mmWave band applications.
Solution Approach 2:
The patent transitions from planar filter structures to a three-dimensional configuration by stacking ground layers and creating vertical resonance spaces bounded by via walls. This dimensional change enables compact size reduction in the horizontal plane while maintaining filter performance through vertical electromagnetic resonance pathways.
2Reliability
If inductive coupling between pins is increased by reducing distance, then coupling strength improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces a blocking wall that selectively divides the resonance space into sub-spaces, creating localized regions around each pin. This local quality modification allows inductive coupling to be enhanced in specific areas through controlled electromagnetic field distribution, while the overall pin positioning tolerances remain manageable for manufacturing.
Solution Approach 2:
The patent optimizes the distance between the bridge and the first ground layer as a design parameter to control inductive coupling. By adjusting this distance and the bridge's cross-sectional area, the desired coupling strength is achieved without requiring extremely tight pin positioning tolerances, thus balancing performance with manufacturing feasibility.
3Reliability
If bridge cross-sectional area is increased to enhance inductive coupling, then coupling amount increases, but device complexity increases
Solution Approach 1:
The patent implements a bridge with a cross-sectional area that is optimized to provide sufficient inductive coupling without being excessively large. The bridge dimensions are carefully selected to achieve the required coupling effect while maintaining simple structural form, avoiding unnecessary complexity in the bridge design.
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 design achieves a compact, high-performance mmWave band LC filter with improved inductive coupling, enabling efficient frequency selection and rejection in the mmWave band, thus addressing the limitations of existing filters.
Implementation Method 1
a via wall having an end connected to the first ground layer and another end connected to the second ground layer, the via wall including a plurality of vias spaced apart from each other
Implementation Method 2
a blocking wall formed as a part of the via wall so as to protrude toward the interior of a resonance space defined by the first ground layer, the via wall, and the second ground layer, thereby dividing the resonance space into a plurality of sub-spaces
Implementation Method 3
a plurality of pin electrodes, each being connected to the other end of a respective one of the plurality of pins, spaced apart from the second ground layer, and formed to face a portion of the second ground layer, a floating electrode spaced apart from the plurality of pin electrodes and formed to face portions of two pin electrodes among the plurality of pin electrodes
Data Source
AI summary
Disclosed is a millimeter-wave (mmWave) band LC filter that is applied to a high-frequency signal in a mmWave band. The mmWave band LC filter includes a first ground layer providing an electrical ground, a second ground layer, a via wall having an end connected to the first ground layer and another end connected to the second ground layer, a blocking wall dividing a resonance space into sub-spaces, holes formed in the second ground layer to open the sub-spaces, pins connected to the first ground layer while passing through the holes, pin electrodes connected to the pins and spaced apart from the second ground layer while facing a portion of the second ground layer, a floating electrode spaced apart from the pin electrodes while facing portions of two of the pin electrodes, and input/output terminals connected to the pin electrodes or the floating electrode and configured to receive and output signals.