Multilayer Filter Layout for Reduced High-Frequency Interference
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Solution Overview
Problem
Current high frequency filters, such as those used in 5G spectrum frequencies, face challenges in customizing performance characteristics and are susceptible to unwanted interference, leading to suboptimal performance.
Innovation Solution
A multilayer filter design featuring a stack of dielectric layers with at least one conductive layer positioned close to the substrate's bottom, within 200 μm, to reduce interference and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional waveguide or cavity designs are used for high frequency filters, then the filter structure is robust, but the performance characteristics are difficult to tailor or customize and the filter is susceptible to unwanted interference
Solution Approach 1:
The filter is divided into multiple discrete layers (first dielectric layer, second dielectric layer, conductive layer) that can be independently designed and manufactured. This segmentation allows each layer to be optimized for specific functions, enabling customized performance characteristics while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention transitions from traditional three-dimensional waveguide or cavity structures to a planar multilayer configuration. By stacking dielectric and conductive layers in the Z-direction, the filter achieves customizable performance characteristics in a compact, two-dimensional footprint, making it adaptable to various applications without increasing structural complexity.
2Reliability
If traditional waveguide or cavity designs are used for high frequency filters, then the filter structure is simple, but the filter is susceptible to unwanted interference affecting performance
Solution Approach 1:
The second dielectric layer acts as an intermediary shielding layer between the conductive layer (which processes the high frequency signal) and the external environment. This intermediate dielectric layer blocks unwanted interference from reaching the sensitive conductive elements, thereby improving filter performance stability without requiring complex shielding structures.
Solution Approach 2:
The conductive layer is nested within the sandwich structure formed by the first and second dielectric layers. This nested configuration protects the conductive elements from external interference while maintaining their functional integrity, thereby improving reliability without adding external shielding components that would increase structural complexity.
3Reliability
If the conductive layer is positioned closer to the bottom of the substrate, then interference is reduced and performance is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The first dielectric layer is applied to the substrate bottom surface before the conductive layer is formed. This preliminary action establishes a stable reference plane and bonding interface, ensuring that the conductive layer can be positioned at the precise location (within 200 μm of the bottom) required for optimal performance. The pre-applied dielectric layer compensates for potential positioning errors and simplifies the manufacturing process.
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 proposed filter design achieves improved high frequency performance with reduced interference, leading to better insertion loss and return loss characteristics compared to traditional waveguide or cavity designs.
Implementation Method 1
at least one conductive layer formed over a dielectric layer of the plurality of dielectric layers. The at least one conductive layer is positioned at a location along the Z-direction between the top and the bottom of the substrate. The location along the Z-direction is about 200 μm or less from the bottom of the substrate
Data Source
AI summary
Filters, filter assemblies, and methods of forming filters are provided. For example, a filter includes a plurality of dielectric layers stacked in a Z-direction to form a substrate having a top and a bottom, and at least one conductive layer is formed over a dielectric layer. The conductive layer is positioned at a location along the Z-direction between the top and bottom of the substrate that is about 200 μm or less from the bottom of the substrate. An assembly includes the filter attached to a device substrate. A method of forming the filter includes forming the dielectric layers and the at least one conductive layer, such as by forming the conductive layer over a dielectric layer, and stacking the plurality of layers to form a substrate with the conductive layer disposed about 200 μm or less from a bottom of the substrate.