Waveguide E-Plane Filter Size Reduction via Ridge-Foil Segmentation
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Solution Overview
Problem
Existing waveguide E-plane band-pass filters are large and complex to manufacture, making them unsuitable for applications with size restrictions while maintaining effective frequency properties.
Innovation Solution
Incorporating a tubular, electrically conductive waveguide body with a conductive foil and at least one ridge that divides the inner volume, reducing the filter's size by up to 60% without degrading its filtering properties, by arranging the foil in mechanical contact with the ridge and optimizing the ridge's dimensions and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional waveguide E-plane filter is used, then the filtering properties are maintained, but the size is large and occupies excessive space
Solution Approach 1:
The waveguide body is divided into multiple sections along its longitudinal direction, with each section containing a specific number of resonator openings. This segmentation allows the filter to achieve the desired frequency filtering properties while reducing the overall size compared to conventional designs that require a single large resonating cavity.
Solution Approach 2:
The invention transitions from a conventional single-cavity E-plane filter design to a multi-section waveguide structure. By distributing resonator openings across multiple sections along the longitudinal direction, the design achieves size reduction while maintaining filtering performance through a different spatial arrangement.
2Volume of moving object
If the waveguide filter size is reduced, then space requirements are met, but manufacturing complexity increases
Solution Approach 1:
The waveguide body is divided into multiple sections along its longitudinal direction, with each section containing a specific number of resonator openings. This segmentation allows the filter to achieve the desired frequency filtering properties while reducing the overall size compared to conventional designs that require a single large resonating cavity.
Solution Approach 2:
The invention changes the geometric parameters of the waveguide structure by introducing multiple sections with different numbers of resonator openings (e.g., first section with two openings, second section with three openings). This parameter variation enables size reduction while maintaining the required filtering characteristics through modified resonating patterns.
3Volume of moving object
If H-plane filters are used instead of E-plane filters, then the size is reduced, but the number of tuning positions increases making it costly and complicated to tune
Solution Approach 1:
The waveguide body is divided into multiple sections along its longitudinal direction, with each section containing a specific number of resonator openings. This segmentation allows the filter to achieve the desired frequency filtering properties while reducing the overall size compared to conventional designs that require a single large resonating cavity.
Solution Approach 2:
The filter design uses fixed geometric structures (multiple sections with specific resonator openings) that inherently provide the required filtering properties without requiring complex tuning mechanisms. The structure serves itself by design, eliminating the need for multiple tuning positions and associated complexity.
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 results in a smaller, less costly filter with improved frequency properties, including higher first harmonic and mode frequencies, reducing noise levels and the number of components needed, while maintaining or enhancing filtering performance.
Implementation Method 1
The foil or insert comprises openings which act as resonators, thereby determining the poles of the filter, and consequently also contribute to determining the passband of the filter
Implementation Method 2
a tubular, electrically conductive waveguide body
Data Source
Figure 1A~2B
Figure 3A~4
Figure 5A
AI summary
It is provided a waveguide E-plane band-pass filter comprising a tubular, electrically conductive waveguide body. An electrically conductive foil is arranged in the waveguide body and extending along a longitudinal direction of the waveguide body, the foil comprising a plurality of resonator openings. Furthermore, the waveguide body comprises at least one ridge protruding from an inner wall of the waveguide body and extending longitudinally along the longitudinal direction of the waveguide body. The foil is in mechanical contact with said at least one ridge and arranged to divide an inner volume of the waveguide body into two portions. It is also provided a diplexer, a radio transceiver, and a method for filtering a signal using such a filter.