Dielectric Waveguide Filter Cross-Coupling for Low-Loss Attenuation
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Solution Overview
Problem
Dielectric waveguide filters with multiple stages experience increased insertion loss and size due to the need for steep attenuation characteristics, particularly on the low and high frequency sides of the pass band, which is not effectively addressed by existing configurations.
Innovation Solution
The configuration includes a dielectric waveguide filter with a main coupling portion and an auxiliary coupling portion, utilizing a trap resonator and inner conductors to reduce the number of stages and enhance attenuation characteristics, thereby minimizing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of stages of dielectric waveguide resonators is increased to ensure predetermined attenuation on low and high frequency sides, then the attenuation characteristics are improved, but the insertion loss in the pass band becomes large and the entire size increases
Solution Approach 1:
The filter structure is segmented into a main path with multiple dielectric waveguide resonators and an auxiliary path with fewer resonators that provides cross-coupling between non-adjacent resonators. This segmentation allows the main path to provide basic attenuation while the auxiliary path enhances attenuation characteristics, reducing the need for excessive stages in the main path and thereby lowering insertion loss.
Solution Approach 2:
An auxiliary path is introduced as an additional dimension to the main signal propagation path. This auxiliary path provides cross-coupling between dielectric waveguide resonators that are not adjacent in the main path, creating attenuation poles on the low and high frequency sides without requiring additional stages in the main path, thus maintaining low insertion loss while achieving steep attenuation characteristics.
2Reliability
If the number of stages of dielectric waveguide resonators is increased to ensure predetermined attenuation on low and high frequency sides, then the attenuation characteristics are improved, but the entire size increases
Solution Approach 1:
The filter structure is segmented into a main path with multiple dielectric waveguide resonators and an auxiliary path with fewer resonators that provides cross-coupling between non-adjacent resonators. This segmentation allows the main path to provide basic attenuation while the auxiliary path enhances attenuation characteristics, reducing the need for excessive stages in the main path and thereby reducing the overall filter size.
Solution Approach 2:
An auxiliary path is introduced as an additional dimension to the main signal propagation path. This auxiliary path provides cross-coupling between dielectric waveguide resonators that are not adjacent in the main path, creating attenuation poles on the low and high frequency sides without requiring additional stages in the main path, thus maintaining a compact size while achieving steep attenuation characteristics.
3Reliability
If cross-coupling is used to couple certain dielectric waveguide resonators by skipping at least one resonator, then attenuation poles are generated on low and high frequency sides, but the number of stages must still be sufficiently large to ensure predetermined attenuation
Solution Approach 1:
The main path and auxiliary path are merged into a single filter structure where the auxiliary path provides cross-coupling between non-adjacent resonators. This merging allows the auxiliary path to contribute to attenuation characteristics while sharing the same physical space and resonators as the main path, reducing the total number of stages needed compared to a purely serial configuration.
Solution Approach 2:
An auxiliary path is introduced as an additional dimension to the main signal propagation path. This auxiliary path provides cross-coupling between dielectric waveguide resonators that are not adjacent in the main path, creating attenuation poles on the low and high frequency sides without requiring additional stages in the main path, thus reducing device complexity while achieving steep attenuation characteristics.
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 achieves steep attenuation characteristics with a reduced number of stages, leading to lower insertion loss and improved frequency performance.
Implementation Method 1
a plurality of dielectric waveguide resonators, a main coupling portion, and an auxiliary coupling portion. Each of the dielectric waveguide resonators includes a dielectric plate including a first main surface, a second main surface, and a side surface
Implementation Method 2
The main coupling portion is between dielectric waveguide resonators that are adjacent to each other along a main path of signal propagation
Data Source
AI summary
A dielectric waveguide filter includes resonators in a dielectric plate. A main coupling portion is between a final stage resonator of a first set and an initial stage resonator of a second set. A trap resonator is between a resonator that is one stage before the final stage resonator of the first set and a resonator that is one stage after the initial stage resonator of the second set, and the trap resonator is coupled to the final stage resonator of the first set and the initial stage resonator of the second set.