Double-Corrugated Via Resonant Elements for Compact Filtering
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Solution Overview
Problem
Current multilayer board technologies require further dimensional reductions of passive components, including filtering structures, for next-generation computing and networking systems while maintaining cost-effectiveness and controlling bandwidth.
Innovation Solution
A specific coaxial transmission line structure is formed in a multilayer board with inner and outer conductive boundaries featuring corrugated edges, creating a double corrugated surface between signal and ground vias, which increases effective relative permittivity and allows for more compact resonant elements and filtering components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional via structures are used in multilayer boards, then manufacturing is simple, but the passive components including filtering structures occupy large area and cannot be sufficiently miniaturized
Solution Approach 1:
The via structure is segmented into multiple functional parts: signal via, ground vias, and intermediate conductive plates at different conductor layers. Each segment performs a specific function in creating the resonant cavity, allowing compact integration while maintaining manufacturing feasibility through standardized layer-by-layer construction.
Solution Approach 2:
The resonant cavity is formed by nesting conductive plates and via structures within the multilayer board thickness. The signal via and ground vias are positioned concentrically, with conductive plates nested between them at intermediate layers, creating a compact three-dimensional resonant structure that utilizes the vertical space of the multilayer board.
2Length of moving object
If conventional transmission line structures are used, then operation on fundamental mode is achieved, but the resonant elements cannot be sufficiently shortened for compact filtering components
Solution Approach 1:
The resonant frequency and electrical characteristics are controlled by adjusting parameters such as the diameter and spacing of signal and ground vias, the dimensions and positions of intermediate conductive plates, and the dielectric properties of the board material. These parameter changes allow optimization of resonant element length while maintaining reliable electrical performance.
Solution Approach 2:
The resonant structure transitions from a two-dimensional planar transmission line to a three-dimensional coaxial resonant cavity formed by vertical via structures and intermediate conductive plates. This dimensional change enables compact resonant elements by utilizing the vertical dimension of the multilayer board, significantly reducing the horizontal footprint while maintaining controlled electrical characteristics.
3Area of stationary object
If compact resonant elements are designed, then filtering components are miniaturized, but control over bandwidth becomes difficult
Solution Approach 1:
The filtering characteristics and bandwidth are made adjustable by incorporating variable elements such as tunable capacitive or inductive structures within the resonant cavity. The intermediate conductive plates can be designed with adjustable positions or configurations, allowing dynamic control of the resonant frequency and bandwidth while maintaining compact dimensions.
Solution Approach 2:
The via-based resonant structure serves multiple functions: it acts as the resonant cavity, provides grounding, establishes characteristic impedance, and enables bandwidth control through adjustable parameters. This multi-functionality allows a single compact structure to achieve filtering, impedance matching, and bandwidth control without requiring additional components.
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 double-corrugated surface design achieves shorter resonant element lengths and shifts resonant frequencies to lower frequencies, enabling more compact and effective filtering components with improved electrical performance.
Implementation Method 1
Due to such double corrugations at the conductive layers in the area between signal and ground vias, the effective relative permittivity with the magnitude larger than the relative permittivity of the board isolating material is established and, as result, resonant conditions are achieved in a short via structure segment.
Implementation Method 2
Open-circuited and short-circuited planar transmission line segments of different forms and dimensions act as stubs, resonators, and other elements of passive components. A reason why the transmission lines have been used for such purposes is that these structures are well wave-guiding structures which can provide operation on a fundamental mode (for example, TEM or Quasi-TEM) with defined propagation constant and characteristic impedance in a wide frequency band.
Data Source
AI summary
A resonant element is provided with a multilayer board, comprising a plurality of conductor layers isolated by a dielectric, a signal via conductor, penetrating through the multilayer board, and a plurality of ground vias, penetrating thought the multilayer board and disposed around the signal via conductor. The multilayer board comprises a first conductor layer, a second conductor layer, and a corrugated conductor layer disposed between the first and the second conductor layers. The corrugated conductor layer comprises a corrugated signal plate, connected to the signal via conductor, and a corrugated ground plate, connected to the plurality of ground vias, isolated from the corrugated signal plate by the dielectric.