Multi-band Cavity Filter with Orthogonal Resonance Modes
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Solution Overview
Problem
Conventional multi-band bandpass filters require multiple cascaded filters, leading to increased size, mass, and insertion loss, making them bulky and difficult to design for multiple passbands, especially in satellite communication systems where efficient signal transmission across non-contiguous channels is needed.
Innovation Solution
A multi-band bandpass filter using cavity resonators with three orthogonal resonance modes, where each resonator defines unique resonance frequencies for concurrent signal transmission, eliminating the need for separate filters and allowing non-interacting signal paths through inter-cavity coupling and L-shaped probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cascaded filters are used for each frequency band, then signal transmission in specific frequency bands is achieved, but device size and mass increase
Solution Approach 1:
The patent combines multiple bandpass filters into a single integrated filter system that handles multiple frequency bands simultaneously. The filter system includes multiple resonator circuits, each tuned to a specific frequency band, allowing concurrent signal transmission across different bands without requiring separate cascaded filters for each band, thereby reducing overall mass and size.
Solution Approach 2:
The filter system is designed to perform multiple functions within a single device structure. It can simultaneously filter and transmit signals across multiple non-contiguous frequency bands (e.g., C-band, X-band, Ku-band) using a unified architecture with shared components such as resonators, coupling mechanisms, and housing, eliminating the need for dedicated separate filter assemblies for each band.
2Reliability
If multiple cascaded filters are used for each frequency band, then signal transmission in specific frequency bands is achieved, but device volume increases
Solution Approach 1:
The patent combines multiple bandpass filters into a single integrated filter system that handles multiple frequency bands simultaneously. The filter system includes multiple resonator circuits, each tuned to a specific frequency band, allowing concurrent signal transmission across different bands without requiring separate cascaded filters for each band, thereby reducing overall mass and size.
Solution Approach 2:
The filter system employs a nested arrangement where multiple resonator circuits are integrated within a shared housing structure. Components such as resonators, coupling mechanisms, and adjustment elements are arranged in a compact nested configuration, allowing one resonator structure to be positioned within or adjacent to another, maximizing space utilization and minimizing the overall volume of the filter system.
3Reliability
If multiple cascaded filters are used for each frequency band, then signal transmission in specific frequency bands is achieved, but insertion loss increases
Solution Approach 1:
The patent combines multiple bandpass filters into a single integrated filter system that handles multiple frequency bands simultaneously. The filter system includes multiple resonator circuits, each tuned to a specific frequency band, allowing concurrent signal transmission across different bands without requiring separate cascaded filters for each band, thereby reducing overall mass and size.
4Reliability
If separate filters are used for each band, then dedicated signal paths are provided, but device complexity increases
Solution Approach 1:
The filter system is designed to perform multiple functions within a single device structure. It can simultaneously filter and transmit signals across multiple non-contiguous frequency bands (e.g., C-band, X-band, Ku-band) using a unified architecture with shared components such as resonators, coupling mechanisms, and housing, eliminating the need for dedicated separate filter assemblies for each band.
Solution Approach 2:
The filter system divides the signal processing function into separate resonator circuits, each tuned to a specific frequency band, while sharing common structural and coupling components. This segmentation allows independent optimization of each frequency band's signal path while maintaining overall system integration, reducing complexity compared to fully separate filter assemblies.
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 enables compact, efficient signal transmission across multiple passbands without the need for cascaded filters, reducing size and mass while maintaining high Q-factors and spurious-free performance.
Implementation Method 1
Each cavity resonator can have three orthogonal resonance modes. The three orthogonal resonance modes can include a first resonance mode, a second resonance mode and a third resonance mode. Each resonance mode may have a corresponding unique resonance frequency.
Data Source
AI summary
A triple-band bandpass filter with at least one cavity resonator. Each cavity resonator has the same three orthogonal resonances modes corresponding to three unique resonance frequencies. The three unique resonance frequencies define the passbands of the filter. The filter has an input probe coupled to an input cavity resonator. The filter has an output probe coupled to an output cavity resonator. The input and output probes are shaped to concurrently couple signal waveforms in each of the resonance modes. Coupling probes that can be used as input or output probes are also provided. An inter-cavity coupling operable to concurrently transmit signal waveforms in each of the resonance modes is also provided. The inter-cavity coupling can be used to transmit signals between adjacent cavity resonators in the filter.