Multilayer High Frequency Filter with Coaxial Line Resonators
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Solution Overview
Problem
Conventional high frequency filters require multiple resonators on the same plane to form a stop band, necessitating significant space for their arrangement.
Innovation Solution
A multilayer substrate configuration with a coaxial line and striplines, where a first columnar conductor acts as an inner conductor and second columnar conductors as outer conductors, each coupled to a ground layer, with open stubs acting as resonators and matching conductors as capacitance matching elements, allowing for the formation of a stop band without multiple resonators on the same plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple resonators are disposed on the same plane to form a stop band, then the stop band function is achieved, but the area occupied by the filter increases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of resonators to a three-dimensional multilayer structure. Resonators are distributed across multiple layers (first resonator layer, second resonator layer, third resonator layer) separated by dielectric substrates, enabling stop band formation without requiring all resonators to occupy the same planar space. This vertical stacking significantly reduces the footprint area while maintaining the stop band filtering function.
Solution Approach 2:
The patent implements a nested configuration where resonators and ground patterns are arranged in alternating layers separated by dielectric substrates. The first resonator layer is nested between ground patterns, which are in turn nested between second resonator layers, creating a compact multilayer structure. This nesting approach allows multiple functional elements to occupy overlapping spatial regions in three dimensions, reducing the overall filter area.
2Reliability
If multiple resonators are disposed on the same plane to form a stop band, then the stop band function is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the filter structure into distinct functional segments: resonator layers, ground pattern layers, and dielectric substrate layers. Each segment performs a specific function (resonance, grounding, insulation) and can be independently designed and manufactured. This segmentation simplifies the overall design process by breaking down the complex multilayer structure into manageable modules, making the device easier to manufacture despite the increased layer count.
Solution Approach 2:
The dielectric substrates serve multiple functions simultaneously: they provide mechanical support for the resonators, provide electrical insulation between conductive layers, and define the spacing that determines resonant frequencies. The ground patterns also serve dual purposes as both grounding elements and as part of the resonant structure. This multi-functionality reduces the need for additional dedicated components, simplifying the overall device structure.
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 configuration enables the formation of a stop band while minimizing the required space, resulting in a more compact high frequency filter design.
Implementation Method 1
Each of the first and second striplines is coupled to an open stub acting as a resonator
Implementation Method 2
a matching conductor acting as a capacitance matching element
Implementation Method 3
a coaxial line including: a first columnar conductor disposed inside the multilayer substrate such that one end of the first columnar conductor is coupled to the first stripline and that another end of the first columnar conductor is coupled to the second stripline
Data Source
AI summary
A coaxial line is provided which includes: a first columnar conductor disposed inside a multilayer substrate such that one end thereof is coupled to a first stripline and that the other end thereof is coupled to a second stripline; and one or more second columnar conductors penetrating the multilayer substrate such that one end thereof is coupled to a ground layer and that the other end thereof is coupled to a ground layer, the first columnar conductor acting as an inner conductor, and the second columnar conductors acting as outer conductors. Each of the first and second striplines is coupled to an open stub acting as resonators and a matching conductor acting as capacitance matching elements.