Dielectric Filter Grounding via Bent Corner Electrodes
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Solution Overview
Problem
Dielectric filters face challenges in maintaining the potential of the outer conductor at the upper surface grounded at high frequencies without using a cover, leading to potential deviations from ground potential due to the placement of input/output electrodes on the undersurface and side surfaces of the dielectric block.
Innovation Solution
The dielectric filter design includes undersurface electrode corner portions and a front surface electrode portion, which are connected to the ground electrode, allowing a ground current to flow directly between these corners and the outer conductor on the upper surface, bypassing the input/output electrodes, thus preventing potential deviations from ground potential at high frequencies. Additionally, the configuration allows for various signal line connection patterns without the need for a cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover is attached to the open surface to make a short circuit between the outer conductor and ground electrode, then the ground potential is maintained, but the number of steps and footprint are increased
Solution Approach 1:
The grounding function is extracted from the cover structure and integrated directly into the outer conductor itself through the corner portions and front surface portions. This eliminates the need for a separate cover component while maintaining effective ground potential stabilization.
Solution Approach 2:
The grounding function is merged with the outer conductor structure. The corner portions and front surface portions of the outer conductor serve dual purposes: maintaining the ground potential and providing the grounding path, thereby eliminating the need for a separate cover component.
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 effectively maintains the outer conductor's potential at ground level at high frequencies, enabling ideal TEM-mode resonance and allowing for multiple signal line connection patterns while reducing the length of the ground current path and avoiding the use of a cover.
Implementation Method 1
A dielectric filter in which a resonator is obtained by forming an inner conductor and an outer conductor at a dielectric block
Implementation Method 2
the outer conductor 103 is connected to a ground electrode 202 of the mount board 201 and the input/output electrodes 104A and 104B are individually connected to signal lines 203A and 203B of the mount board 201
Data Source
AI summary
A dielectric filter having a dielectric block disposed on a mount board. The dielectric block includes inner conductor holes having open ends on the front surface of the dielectric block. Input/output electrodes are disposed on the undersurface of the dielectric block. Each of the input/output electrodes extends from the boundary between a side surface and the undersurface of the dielectric block to the boundary between the front surface and the undersurface of the dielectric block. An outer conductor includes undersurface electrode corner portions and an undersurface electrode main portion. Each of the undersurface electrode corner portions is disposed at a corner formed by the front surface and one of the side surfaces of the dielectric block.