Slotted Waveguide Antenna With Coupling Slot For Active Circuit Integration
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Solution Overview
Problem
Existing electromagnetic antennas face challenges with high electrical losses and bulkiness, limiting their range and compactness, especially when integrating active circuits for signal processing.
Innovation Solution
The design incorporates a slotted waveguide with a second active part comprising a stack of dielectric layers etched with metal tracks, connected via a coupling slot that forms a non-zero orientation angle with the radiating slots, allowing for low electrical losses and reduced bulk without additional coupling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a slotted waveguide antenna is used, then electrical losses are low, but integration of active circuits is difficult
Solution Approach 1:
The antenna is divided into two separate parts: a first radiating part with the slotted waveguide and a second active part with stacked dielectric layers containing active circuits. This segmentation allows each part to maintain its optimal characteristics - the slotted waveguide maintains low electrical losses while the separate active part enables easy integration of active circuits through standard PCB techniques.
Solution Approach 2:
A coupling slot is introduced as an intermediary element between the first radiating part and the second active part. This coupling slot enables electromagnetic energy transfer between the two parts without requiring direct physical integration, thus maintaining the advantages of both separate structures while achieving functional integration.
2Adaptability or versatility
If additional coupling elements are added to connect active circuits, then integration is improved, but overall size increases
Solution Approach 1:
The coupling slot is formed as an integrated feature within the waveguide structure itself, merging the coupling function with the existing radiating part geometry. This eliminates the need for separate external coupling elements and reduces the overall antenna volume while maintaining effective coupling between the radiating and active parts.
Solution Approach 2:
The coupling slot serves multiple functions simultaneously: it acts as a coupling element for energy transfer, defines part of the radiation pattern, and integrates the active part into the waveguide structure. This multi-functionality reduces the need for additional dedicated components, thereby minimizing overall size.
3Adaptability or versatility
If stacked dielectric layers with metallized holes are used, then active circuit integration is improved, but electrical losses increase
Solution Approach 1:
The harmful metallized holes (vias) that cause electrical losses are extracted from the design. Instead of using metallized holes to connect the stacked dielectric layers to the waveguide, the invention uses a coupling slot that passes through the dielectric layers without requiring conductive fills, thereby eliminating the source of electrical losses while maintaining active circuit integration capability.
Solution Approach 2:
The coupling structure uses a simplified version of the traditional vias approach - instead of metallized holes, non-conductive holes or slots are used that copy the structural concept of through-layer connections without the harmful metallic components that cause losses.
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 minimizes electrical losses and reduces the antenna's bulk while enabling easy integration of active circuits, enhancing both the radiated power and sensitivity, thus extending the antenna's range and allowing for more compact designs.
Implementation Method 1
a coupling slot located in said contact zone, the coupling slot passing through said second wall, said coupling slot extending in a second direction forming a non-zero orientation angle with said first longitudinal direction
Implementation Method 2
a first radiation wall comprising a plurality of spaced radiating slits, each radiating slit extending along a first longitudinal direction
Data Source
Figure 1~3
AI summary
The invention relates to an electromagnetic antenna having a first electromagnetic waveguide radiating part (12) of predetermined geometric shape, forming a first electromagnetic propagation medium and having a first radiation wall (18) having a plurality of spaced-apart radiating slots (22), each radiating slot (22) extending in a first longitudinal direction, and a second wall (20), opposite the first wall (18). The antenna has a second active part (14) comprising a stack of at least two dielectric layers (42, 44), at least one of the dielectric layers being etched with at least one metal track, resulting in at least one active circuit, forming a second electromagnetic propagation medium, at least one portion of said second active part being pressed against said second wall in a contact area. A coupling slot (30, 30a, 30b) is situated in said contact area, the coupling slot passing through said second wall (20) and extending in a second direction forming a nonzero angle of orientation with said first longitudinal direction.