Dielectric Filter Coupling Port Structure for Wider Bandwidth
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Solution Overview
Problem
Current dielectric filters in communication systems suffer from weak coupling between connection ports and resonant cavities, leading to transmission delays and limited bandwidth expansion.
Innovation Solution
The dielectric filter design includes a coupling port with a blind hole, first and second slots on the dielectric body, where the slots form a resonant cavity with metalized inner walls, and the depths of these slots are adjusted to enhance port coupling strength and reduce delay while maintaining the original resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coupling port structures are used in dielectric filters, then the filter structure is simple, but the coupling strength between the connection port and resonant cavity is weak, resulting in transmission delay and limited bandwidth
Solution Approach 1:
The coupling port is segmented into multiple components: a blind hole on the first surface, a first slot on the second surface, and a second slot on the side surface. These segmented structures work together to form a composite coupling mechanism that enhances coupling strength while reducing transmission delay through optimized electromagnetic field distribution.
Solution Approach 2:
The coupling port structure transitions from conventional two-dimensional surface coupling to three-dimensional volumetric coupling by incorporating a blind hole extending into the dielectric body and multiple slots at different orientations. This dimensional expansion creates stronger electromagnetic interaction between the coupling port and resonant cavity.
2Reliability
If the depth of slots is increased to enhance coupling strength, then the port coupling coefficient improves, but the resonance frequency changes and bandwidth expansion is limited
Solution Approach 1:
Different slots are designed with distinct local characteristics: the blind hole provides deep volumetric coupling, the first slot offers surface-level electromagnetic interaction, and the second slot on the side surface provides directional coupling. This local quality differentiation allows each component to contribute uniquely to overall coupling strength while maintaining resonance frequency stability and enabling bandwidth expansion.
Solution Approach 2:
The coupling port employs a composite structural approach combining different geometric forms (blind hole, slots) and orientations within the dielectric body. This composite structure leverages the complementary strengths of each component to achieve enhanced coupling coefficient while maintaining adaptability for bandwidth expansion through optimized dimensional parameters.
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 design doubles the relative bandwidth of the dielectric filter by reducing port delay and enhancing coupling strength, facilitating wideband filtering capabilities.
Implementation Method 1
The blind hole, the first slot, and the second slot each have a metalized inner wall. The entire slot structure formed by the first slot and the second slot can be used as a resonant cavity of the dielectric filter
Implementation Method 2
an electroplating process may be performed on an inner wall of the blind hole, the first slot, or the second slot to form the metalized inner wall
Data Source
AI summary
A dielectric filter is provided. The dielectric filter includes a dielectric body, and a coupling port and one or more resonant cavities that are disposed at the dielectric body. The dielectric body has a first surface, a second surface, and a side surface. The first surface and the second surface are opposite to each other. The coupling port includes a blind hole disposed on the first surface, a first slot disposed on the second surface, and a second slot disposed on the side surface. The first slot extends in a direction of the side surface and communicates with the second slot. A projection of an outer contour of the first slot on the first surface covers at least a part of the blind hole. The blind hole, the first slot, and the second slot each have a metalized inner wall. The blind hole may be coupled to the first slot.