Dielectric Waveguide Resonator Metal Loading for Wider Bandwidth
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Solution Overview
Problem
Dielectric waveguide filters face challenges in balancing size and performance, with standard rectangular waveguides having narrow bandwidth and high unloaded Q values, while quasi-TEM modes with blind holes increase bandwidth but reduce Q values, necessitating increased filter volume.
Innovation Solution
Incorporating a metal loading interface within the dielectric body of the waveguide resonator, which intersects the intrinsic electric field direction, reduces the dominant-mode frequency and increases the bandwidth between high-order and dominant-mode frequencies without altering the size or unloaded Q value, thereby enhancing low-pass filter performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard rectangular waveguide TE10 mode is used, then a high power capacity and a large unloaded Q value are achieved, but the high-order mode frequency is close to the dominant-mode frequency and the channel bandwidth is narrow
Solution Approach 1:
The patent introduces a metal loading structure (metal plate or metal cylinder) into the dielectric waveguide resonator, which changes the electromagnetic field distribution and resonant characteristics. This parameter change in the resonator structure allows the high-order mode frequency to be separated from the dominant-mode frequency, thereby broadening the channel bandwidth while maintaining the high unloaded Q value characteristic of dielectric waveguides.
2Area of stationary object
If a quasi-TEM mode loaded with a blind hole is used, then the high-order mode frequency is increased and the channel bandwidth is broadened, but the unloaded Q value is reduced
Solution Approach 1:
The patent employs a composite structure combining dielectric material (for high Q value) with metal loading elements (for bandwidth control). The dielectric waveguide resonator body maintains the high unloaded Q value, while the strategically positioned metal loading structure adjusts the resonant frequencies to broaden the channel bandwidth, achieving a synergistic effect that resolves the contradiction between Q value and bandwidth.
3Loss of energy
If the volume of the dielectric waveguide filter is increased to compensate for loss, then the structure loss is compensated, but the size and parameters of the filter cannot be balanced
Solution Approach 1:
The metal loading structure modifies the electromagnetic field confinement and distribution within the resonator, improving the quality factor and reducing energy loss without requiring an increase in filter volume. This parameter change in the resonator design allows loss compensation while maintaining compact dimensions and balanced filter 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
This approach improves the performance of low-pass filters by broadening the bandwidth and reducing losses while maintaining constant size and Q values, effectively balancing filter parameters.
Implementation Method 1
a metal interface provided in the dielectric body and connected to the metal plating layer, where the metal interface intersects a direction of an intrinsic electric field of the dielectric resonant cavity
Implementation Method 2
a dielectric resonant cavity including a dielectric body and a metal plating layer wrapping an outer surface of the dielectric body
Data Source
AI summary
A dielectric waveguide resonator includes: a dielectric resonant cavity including a dielectric body and a metal plating layer wrapping an outer surface of the dielectric body; and a metal interface provided in the dielectric body and connected to the metal plating layer, where the metal interface intersects a direction of an intrinsic electric field of the dielectric resonant cavity. The dielectric waveguide resonator includes a blind hole recessed inwards from a surface of the dielectric body, where a bottom surface of the blind hole includes the metal interface, and where an axial direction of the blind hole corresponds with the direction of the intrinsic electric field of the dielectric resonant cavity.