Waveguide Section With Integrated LC Filtering for Antenna Arrays
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Solution Overview
Problem
Current antenna array technologies face challenges in designing efficient filters for suppressing unwanted emissions and interference, particularly due to high insertion loss and sensitivity to frequency precision, which complicates the integration of filters with antenna elements, and are costly and difficult to assemble.
Innovation Solution
A waveguide section comprising air-filled conducting tubes with integrally formed electrically conducting protrusions that form capacitances and inductances, enabling LC-resonators for effective electromagnetic filtering, and a single-piece antenna solution that integrates filtering functionality, reducing dielectric losses and assembly complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filters are used to suppress unwanted emissions and interference, then filtering capability is improved, but insertion loss increases and frequency precision requirements become more stringent
Solution Approach 1:
The patent merges the filter structure with the antenna element by integrating resonators directly into the antenna radiating elements. The resonators are formed as protrusions from the antenna substrate, creating a unified structure that provides both radiation and filtering functions, thereby reducing insertion loss associated with separate filter components and connections
Solution Approach 2:
The antenna elements are designed to serve dual functions: radiation and filtering. The resonators integrated into the antenna substrates provide filtering capabilities while the antenna elements themselves serve as radiating structures, eliminating the need for separate filter components and reducing overall system loss
2Reliability
If separate filters are integrated with antenna elements, then filtering functionality is improved, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The filter structure is merged with the antenna element by forming resonators as integral parts of the antenna substrate. This integration eliminates separate filter components and their associated mounting, alignment, and connection operations, significantly reducing assembly complexity
Solution Approach 2:
The antenna substrate serves multiple functions: it provides the radiating elements and simultaneously incorporates the resonators for filtering. This multi-functionality reduces the total component count and simplifies the overall assembly process
3Strength
If dielectric materials are used in waveguide sections, then structural integrity is improved, but frequency precision deteriorates due to dielectric variations
Solution Approach 1:
The patent removes dielectric materials from the waveguide sections and replaces them with air-filled cavities. The resonators are formed as metallic protrusions within the air-filled waveguide, eliminating dielectric losses and frequency drift caused by dielectric variations while maintaining structural integrity through the metallic structure
Solution Approach 2:
Air is used as the filling medium in the waveguide sections instead of dielectric materials. The air-filled environment provides a stable, loss-free medium that does not exhibit dielectric variations, thereby improving frequency precision while the metallic waveguide structure maintains mechanical integrity
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 provides improved filtering capabilities with reduced insertion loss, enhanced frequency precision, and cost-effective, simplified assembly of antenna arrays, while minimizing the impact of dielectric variations and allowing for compact designs.
Implementation Method 1
Each protrusion comprises a corresponding plate part that is adapted to form a capacitance with at least one other plate part in the same set of protrusions
Implementation Method 2
each protrusion comprises a corresponding holding part that connects each plate part to the inner wall and forms an inductance
Implementation Method 3
at least one air-filled waveguide conducting tube having a longitudinal extension. Each waveguide conducting tube has an electrically conducting inner wall
Implementation Method 4
enabling LC-resonators for effective electromagnetic filtering
Data Source
AI summary
The present disclosure relates to a waveguide section (101) comprising at least one air-filled waveguide conducting tube (104; 104a, 104b, 104c, 104d) having a longitudinal extension (L1). Each waveguide conducting tube (104; 104a, 104b, 104c, 104d) has an electrically conducting inner wall (106) and comprises at least one set of at least two electrically conducting integrally formed protrusions (107; 107a, 107b, 107c, 107d). Each protrusion (107a, 107b, 107c, 107d) is electrically conducting and comprises a corresponding plate part (109; 109a, 109b, 109c, 109d) that is adapted to form a capacitance (C1, C2, C3, C4; C10; C11) with at least one other plate part in the same set of protrusions (107; 107a, 107b, 107c, 107d) for each set of protrusions (107; 107a, 107b, 107c, 107d), whereby an RF, radio frequency, signal passing via a corresponding waveguide conducting tube (104) is arranged to be electromagnetically filtered.