Dielectric Waveguide Electrode Structure for Leakage Reduction
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Solution Overview
Problem
Existing dielectric waveguide filters face issues with electromagnetic field leakage and mismatch due to discontinuities between input/output electrodes and printed circuit board lines, leading to increased reflection and radiation losses.
Innovation Solution
The input/output structure of the dielectric waveguide features electrodes extending from the vertex or neighborhood of the vertex on the dielectric's face with conductor-unformed sections along the sides and ends, reducing electromagnetic field mismatch and leakage by avoiding conductor film in these areas, and optimizing electrode lengths and conductor-unformed section dimensions for improved coupling and frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If input/output electrodes are formed on bottom faces and side walls of dielectric waveguide resonators, then the dielectric waveguide filter can be mounted directly onto a printed circuit board, but electromagnetic field leakage and mismatch occur due to discontinuities between electrodes and board lines
Solution Approach 1:
The patent introduces a conductor film as an intermediary element that extends from the input/output electrodes on the dielectric waveguide resonator to the printed circuit board. This conductor film acts as a mediator that bridges the discontinuity between the electrode and the board line, providing a continuous electromagnetic field path and reducing both field leakage and mismatch losses while maintaining the direct mounting capability.
2Reliability
If input/output electrodes extend from the middle of two sides toward opposite sides, then coupling is achieved, but positional deviations during mounting increase reflection and radiation losses
Solution Approach 1:
The patent performs preliminary action by extending the conductor film beyond the input/output electrodes to form a continuous path that reaches the printed circuit board before mounting occurs. This pre-established conductor path compensates for potential positional deviations during mounting, as the extended conductor film provides tolerance for alignment variations while maintaining consistent electromagnetic coupling and reducing sensitivity to manufacturing precision variations.
3Object-affected harmful factors
If conductor film is formed on all outer faces of the dielectric, then shielding is improved, but electromagnetic field discontinuity increases at input/output sections
Solution Approach 1:
The patent applies local quality by selectively forming the conductor film only on specific portions of the dielectric waveguide resonator's outer faces, rather than covering all surfaces. The conductor film is placed strategically to provide shielding where needed while intentionally leaving certain areas without conductor film to maintain electromagnetic field continuity at the input/output sections, thus achieving both shielding and field continuity locally.
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 reduces electromagnetic field leakage and reflection losses, enhances coupling coefficients, and allows for broader frequency band performance by minimizing positional deviations during mounting and maintaining low external Q factors.
Implementation Method 1
a dielectric of a rectangular parallelepiped in shape, an input/output electrode formed on a first face of the dielectric, and a conductor film formed on an outer face of the dielectric
Data Source
AI summary
A dielectric waveguide includes a dielectric of a rectangular parallelepiped in shape, an input/output electrode formed on a first face of the dielectric, and a conductor film formed on an outer face of the dielectric. The input/output electrode extends from a first end which is a vertex or a neighborhood of the vertex of a first face (bottom face) of the dielectric inward on the bottom face; and environs along both sides and the first end of the input/output electrode include a conductor-unformed section in which there is no conductor film.