Bent E-Plane Septum Filter for Compact Wireless Systems
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Solution Overview
Problem
Existing microwave filter designs for wireless communications, particularly in the EHF range, face challenges in achieving a compact form factor while maintaining performance due to the need for a large number of poles, which increases the filter length and housing size, making integration with other system components difficult and costly.
Innovation Solution
The design incorporates a band-pass E-plane septum filter with a waveguide formed by two linear segments coupled by a first angular bend, featuring an insert plate with resonant cavities and conductive septa, allowing for a shorter length along the x-direction compared to straight septum filters, and can be fabricated using off-the-shelf components with a non-curvilinear structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of poles are used in the filter design, then the filter performance is improved, but the filter length and housing size increase
Solution Approach 1:
The patent introduces angular bends (90-degree or other angles) into the waveguide structure, changing the linear arrangement into a multi-dimensional configuration. This allows the filter to achieve the required electrical length and performance characteristics without proportionally increasing the physical linear footprint, effectively resolving the contradiction between performance and length.
Solution Approach 2:
The patent places resonant cavities and insert plates within the angular bend sections of the waveguide. By nesting these filtering elements within the bent sections rather than requiring additional linear space, the design achieves complex filtering performance with compact overall dimensions.
2Adaptability or versatility
If the filter length is reduced, then the integration with system components is improved, but the filter performance may deteriorate
Solution Approach 1:
The patent modifies the waveguide geometry by introducing angular bends with specific radius of curvature (less than 10 mm) and precise positioning of resonant cavities within these bends. These parameter changes allow the electromagnetic fields to interact with the filtering elements more efficiently, maintaining performance in a shorter overall structure that integrates better with system components.
3Ease of manufacture
If a non-curvilinear structure with angular bends is used, then the manufacturing cost is reduced, but the filter design complexity increases
Solution Approach 1:
The patent divides the waveguide into discrete linear segments connected by angular bends, with insert plates and resonant cavities positioned at specific locations. This segmentation allows each component to be manufactured and positioned independently using standard fabrication techniques, reducing overall manufacturing complexity despite the non-linear configuration.
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 results in a more compact and cost-effective filter that maintains performance, facilitating integration into wireless radios by reducing the overall length by about 40% while providing a narrow pass band with sharp roll-off, suitable for high-frequency applications.
Implementation Method 1
the insert plate comprises a flat metal sheet having a plurality of resonant cavities comprising portions removed from the flat sheet
Implementation Method 2
a band-pass filter for a wireless communications signal is provided
Data Source
AI summary
A band-pass filter for a wireless communications signal is provided. The band-pass filter includes a first element and a second element that mates with the first element to form a waveguide. The formed waveguide comprises a first linear segment and a second linear segment coupled by a first angular bend. The band-pass filter further includes an insert plate disposed between the first element and the second element along a direction of propagation of the waveguide. The direction of propagation follows the angular bend in the waveguide. In some embodiments, the band-pass filter is an E-plane filter. In some embodiments, the band-pass septum filter has a shorter length along an x-direction than a straight septum filter with the same performance.