Filter Structure with Resonance Holes for Frequency Response
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Solution Overview
Problem
Current surface mount filters used in communication systems like LNB, GPS, and Wi-Fi suffer from inadequate frequency response, size constraints, and spurious responses due to improper design patterns, leading to suboptimal performance in terms of insertion loss and out-band rejection.
Innovation Solution
The proposed filter structure incorporates a substrate with resonance holes of different shapes and lengths, a metal pattern layer, and electrodes to enhance coupling capacitance, reduce size, and improve frequency response, featuring a grounded metal layer and resonance metal layers arranged for mutual coupling to achieve desired frequency bands with low insertion loss and out-band rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonance holes of different shapes and lengths are used, then frequency response is improved and spurious responses are mitigated, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating resonance holes with different shapes (circular, elliptical, rectangular) and different lengths at specific locations within the substrate. Each resonance hole is tailored to its local position to achieve optimal frequency response characteristics and mitigate spurious responses at different frequency bands, rather than using uniform resonance holes throughout the structure.
2Reliability
If metal pattern layer is added on open surface, then coupling capacitance increases and desired frequency band is obtained, but manufacturing complexity increases
Solution Approach 1:
The patent merges the metal pattern layer with the existing grounding structure by integrating it into the same manufacturing process that forms the grounded metal layer. The metal pattern layer is formed on the open surface using the same conductive material and deposition techniques as the grounding layer, combining multiple functional elements into a unified manufacturing sequence rather than requiring separate assembly steps.
3Volume of moving object
If resonance holes are made shorter, then filter size is reduced, but Q value decreases and spurious response increases
Solution Approach 1:
The patent employs asymmetry by using resonance holes of different lengths and shapes rather than uniform symmetric holes. Shorter holes are strategically placed in specific regions while longer holes are positioned in other areas, creating an asymmetric distribution that reduces overall filter size while maintaining adequate Q values through the varied resonance characteristics of different hole configurations.
4Reliability
If multiple resonance holes with different parameters are used, then frequency response is improved, but design complexity increases
Solution Approach 1:
The patent segments the resonance hole structure into distinct types (circular, elliptical, rectangular) with different lengths and shapes, where each segment serves a specific frequency response function. This segmentation allows the complex frequency response requirements to be divided into manageable discrete elements, each optimized for particular frequency bands, making the overall design more systematic and controllable.
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 improved filter structure achieves enhanced frequency response, reduced size, and mitigated spurious responses, allowing for better performance in communication systems by adjusting the metal pattern layer and resonance metal layers, resulting in improved coupling properties and operational frequency bands.
Implementation Method 1
The metal pattern layer, the resonance metal layers, and the grounded metal layer are arranged to have electrical properties of a filter structure of mutual coupling such that a desired frequency band is obtained by adjusting the metal pattern layer and the lengths of the resonance metal layers
Implementation Method 2
The resonance metal layers are disposed in the resonance holes. The grounded metal layer on the short-circuit surface is electrically connected to the resonance metal layers in the resonance holes to form a short-circuit end; the resonance metal layers on the open surface form an open end
Data Source
AI summary
A filter structure improvement includes a substrate, resonance layers, a grounded layer, a pattern layer, an input electrode, and an output electrode. The substrate has resonance holes in which the resonance layers are disposed. One end of the resonance hole is on the open surface and the other end of the resonance hole is on the short-circuit surface. The grounded layer is on the short-circuit surface, top surface, bottom surface, and side surfaces and is electrically connected to the resonance layers to form a short-circuit end. The input and output electrodes, electrically isolated from the grounded layer, are on the bottom or open surface of the substrate. The pattern layer, resonance layers, and grounded layer are arranged to have electrical properties of a filter structure of mutual coupling such that a desired frequency band is obtained by adjusting the pattern layer and the lengths of the resonance layers.