Glide-Symmetric Waveguide Filter Layout for Wide Stop-Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing waveguide filters for mm-waves and submm-waves applications face challenges such as high manufacturing complexity and cost due to small metallic pin dimensions, limited stop-band rejection, and difficulty in achieving multiple pass-bands and stop-bands, especially with traditional waveguide filters like stubs, iris filters, and gap waveguides.
Innovation Solution
The design employs glide-symmetric structures with elements distributed on parallel plates, allowing for easy manufacturing and integration, featuring large stop-bands, flexible multiple pass-bands, and low losses, using a rectangular parallelepiped cavity with elements on one plate mirrored and offset on the other, enabling cost-effective production and improved filtering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional waveguide filters (stubs, iris filters, gap waveguides) are used for mm-waves applications, then filtering performance is achieved, but manufacturing complexity and cost increase due to small dimensions and precise assembly requirements
Solution Approach 1:
The filter is divided into multiple unit cells, each containing a specific number of elements (e.g., 3 elements per unit cell). Each unit cell can be independently designed and manufactured, then assembled to form the complete filter structure. This segmentation reduces the complexity of manufacturing the entire filter as a single complex component.
Solution Approach 2:
The patent uses repetitive unit cells with identical or similar element configurations. Each unit cell is a copy of the basic design pattern, allowing for standardized manufacturing processes. The filter consists of multiple identical unit cells arranged in sequence, which simplifies production compared to custom-designed complex waveguide structures.
2Reliability
If traditional waveguide filters are used for mm-waves applications, then filtering is achieved, but stop-band rejection is limited
Solution Approach 1:
The patent employs different element types (e.g., shorting pins, open stubs, iris elements) with specific local characteristics within each unit cell. Each element type provides different filtering characteristics, and their combination within unit cells creates enhanced stop-band rejection while maintaining pass-band performance. The selective placement of different element types optimizes both filtering performance and stop-band rejection.
3Reliability
If traditional waveguide filters are used for mm-waves applications, then filtering is achieved, but achieving multiple pass-bands and stop-bands is difficult
Solution Approach 1:
The patent uses可调 (tunable) elements within the unit cells that can be adjusted to change the filtering characteristics. By modifying the position, size, or configuration of elements within unit cells, the filter can be reconfigured to achieve different pass-bands and stop-bands, providing adaptability for multiple frequency ranges without requiring completely different filter designs.
Solution Approach 2:
The unit cell design incorporates multiple element types that can serve different functions simultaneously. The same basic unit cell structure can be configured to provide low-pass, high-pass, band-pass, or band-stop filtering characteristics depending on the specific element configuration, making the filter structure universal and adaptable to multiple application requirements.
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 results in filters that are easier and cheaper to manufacture, offer large stop-bands to suppress out-of-band emissions, provide flexible multiple pass-bands, and achieve low losses, facilitating integration with existing components in mm-waves, while being more robust than traditional waffle-iron filters.
Implementation Method 1
The filter comprises a cavity with a first plate and a second plate, the first and second plates being in parallel and opposite to each other. The first plate comprises a number of elements distributed on the side of the first plate facing the cavity, a location of each element on the first plate being defined in a coordinate system. The second plate comprises a number of elements distributed on the side of the second plate facing the cavity according to the locations of the elements on the first plate, each element being distributed on the second plate with an offset with respect to a corresponding element on the first plate.
Data Source
AI summary
A filter for filtering an electromagnetic wave and a filter design method are provided. The filter comprises a cavity with a first plate and a second plate, the first and second plates are opposite to each other. The first plate comprises a number of elements distributed on the side of the first plate facing the cavity, wherein a location of each element on the first plate is defined in a coordinate system. The second plate comprises a number of elements distributed on the side of the second plate facing the cavity according to the locations of the elements on the first plate, wherein each element is distributed on the second plate with an offset with respect to a corresponding element on the first plate.