Waveguide E-Plane Filter With Interchangeable Foil Loops
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Solution Overview
Problem
Existing waveguide E-plane filter components are limited in their ability to be used for different center frequencies and frequency bands without fixed relative positions of extracted cavities, which restricts the flexibility of using the same main parts with different electrically conducting foils to achieve desired filter characteristics.
Innovation Solution
A waveguide E-plane filter structure where the same main parts can be used across various frequency bands by employing electrically conducting foils with foil loops and apertures that run between the waveguide section parts, eliminating the need for fixed extracted cavities and allowing for easy adjustment of filter characteristics by changing the foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed extracted cavities (T-junctions) are used to achieve transmission zeroes, then filter spectral selectivity and stop-band attenuation are improved, but the adaptability to different center frequencies and bandwidths deteriorates due to fixed relative positions
Solution Approach 1:
The filter is segmented into two independent parts: main parts (waveguide sections) and a separate electrically conducting foil with aperture configuration. This segmentation allows the foil to be changed independently to adjust filter characteristics without modifying the main parts, resolving the contradiction between maintaining fixed extracted cavities for spectral selectivity and adapting to different frequencies.
Solution Approach 2:
The main parts are designed to be universal and reusable across different frequency bands. By making the main parts multi-functional and pairing them with interchangeable foils, the system achieves both the stability needed for spectral selectivity and the flexibility needed for different center frequencies and bandwidths.
2Adaptability or versatility
If multiple types of main parts are manufactured to accommodate different extracted cavity positions, then adaptability to different frequency characteristics is improved, but manufacturing complexity and production costs increase
Solution Approach 1:
The system is divided into permanent main parts and interchangeable foils. This segmentation allows adaptability to be achieved through foil replacement rather than manufacturing multiple main part types, thereby reducing manufacturing complexity while maintaining versatility.
Solution Approach 2:
Instead of changing the physical structure of main parts to adapt to different frequencies, the invention changes the aperture parameters on the electrically conducting foil. This parameter change approach maintains a single main part design while achieving different filter characteristics through foil variations.
3Adaptability or versatility
If multiple types of main parts are manufactured for different frequency bands, then filter versatility is improved, but production costs and logistical complexity increase
Solution Approach 1:
A single type of main part is designed to work across multiple frequency bands when paired with different foils. This universality reduces production costs by eliminating the need to manufacture multiple main part types, while maintaining filter versatility through foil interchangeability.
Solution Approach 2:
The invention achieves filter versatility by changing parameters on the electrically conducting foil (aperture size, shape, position, number) rather than changing the main parts themselves. This approach significantly simplifies manufacturing and reduces logistical complexity while maintaining the ability to create different filter characteristics.
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 reduces production costs and logistical complexity by allowing only one type of main part to be manufactured, enabling easier handling and manufacturing of different foils, and providing a versatile and cost-effective filter arrangement.
Implementation Method 1
The electromagnetic field propagates parallel to the intersection. Since the waveguide section part normally have equal sizes, and thus the same width of the corresponding sides, the dominant TE10 mode of the electromagnetic field has its maximum magnitude at said intersection.
Implementation Method 2
an electrically conducting foil is placed, having a filter part comprising full height or partial-height apertures. The filter part runs between the waveguide section parts.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a waveguide E-plane filter component (1) comprising a first main part (2) and a second main part (4) which in turn comprise a corresponding first and second waveguide section part (3, 5). The main parts (2, 4) are arranged to be mounted to each other, each waveguide section part (3, 5) comprising a bottom wall (6), corresponding side walls (7) and an open side (8, 9), where the open sides (8, 9) are arranged to face each other. The waveguide E-plane filter component (1) further comprises at least one electrically conducting foil (10, 11) that is arranged to be placed between the main parts (2, 4), said foil (10, 11) comprising a filter part (22) that is arranged to run between the waveguide section parts (3, 5), the filter part (22) comprising apertures (12a, 12b, 12c), in said foil (10, 11). The filter part (22) at least partly comprises at least one foil loop (13) constituted by a foil conductor (14) at least partly running in a corresponding further aperture (15a, 15b) in said foil, dividing said corresponding aperture (15a, 15b).