Dielectric Waveguide Filter Stacked Resonators Cross-Coupling
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Solution Overview
Problem
Dielectric waveguide filters face challenges in increasing attenuation characteristics without extending filter length or using top surface metallization patterns, which are not applicable in certain waveguide filter designs.
Innovation Solution
A dielectric waveguide filter design incorporating both direct and optional cross-coupled resonators, with slots and conductive material layers to enhance attenuation without increasing length or using top surface metallization, utilizing stacked resonators and RF signal transmission windows for efficient signal path management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional resonators are incorporated to increase attenuation characteristics, then attenuation performance is improved, but filter length increases which may not be desirable due to space limitations
Solution Approach 1:
The patent transitions from a one-dimensional linear arrangement of resonators to a three-dimensional stacked configuration. Multiple resonators are arranged vertically in layers rather than horizontally in a single row, allowing attenuation to be improved without increasing the horizontal filter length. This dimensional change enables compact integration while maintaining performance.
Solution Approach 2:
The patent introduces coupling structures (such as coupling capacitors or magnetic coupling elements) as intermediaries between resonators to achieve attenuation enhancement through cross-coupling mechanisms. These intermediary elements enable the resonators to interact in ways that improve attenuation without requiring additional resonator length, facilitating compact filter design.
2Reliability
If top surface metallization patterns are used to achieve direct and cross-coupling, then coupling performance is improved, but this approach is not applicable in waveguide filters without top surface metallization
Solution Approach 1:
The patent applies different coupling mechanisms to different locations within the filter structure. Instead of relying on top surface metallization patterns, it uses localized coupling structures such as side-coupling slots, magnetic coupling elements, or electric field coupling regions positioned at specific locations where resonators interact. This localized approach maintains coupling performance while being compatible with waveguide filter designs that lack top surface metallization.
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 solution effectively increases attenuation characteristics without lengthening the filter or employing top surface metallization, providing improved performance in waveguide filters by using direct and indirect coupling paths through stacked resonators and conductive windows.
Implementation Method 1
a first RF signal transmission window defined in the interior layer of conductive material and defining a direct path for the transmission of an RF signal between the plurality of stacked resonators
Data Source
AI summary
A dielectric waveguide filter comprising a block of dielectric material covered with an exterior layer of conductive material. A plurality of stacked resonators are defined in the block of dielectric material by one or more slots in the block of dielectric material and an interior layer of conductive material that separates the stacked resonators. First and second RF signal transmission windows in the interior layer of conductive material provide for both direct and cross-coupling RF signal transmission between the stacked resonators. In one embodiment, the waveguide filter is comprised of separate blocks of dielectric material each covered with an exterior layer of conductive material, each including one or more slots defining a plurality of resonators, and coupled together in a stacked relationship.