SIW Antenna with Coupling Apertures for Millimeter Wave Bandwidth
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Solution Overview
Problem
Existing substrate integrated waveguide (SIW) antennas face challenges with tolerance issues, high manufacturing costs, and narrow-banded functionality, particularly in the millimeter wave range, while also requiring integrated RF-circuits and duplex filters.
Innovation Solution
The antenna arrangement employs a SIW distribution network with multiple radiating elements and coupling apertures, allowing for a hierarchical signal transfer and integration of duplex filters, using a single milling operation to reduce complexity and cost, and enabling wideband operation with low loss and good matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple layers with SIW distribution network and radiating structures are used, then antenna functionality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple antenna layers and the SIW distribution network into a single integrated structure fabricated by one milling operation. Instead of separately manufacturing multiple layers and assembling them, the invention mills through the entire multi-layer structure in a single continuous process, merging what would traditionally be separate manufacturing steps into one operation.
Solution Approach 2:
The milling operation is designed to perform multiple functions simultaneously: it creates the SIW distribution network channels, forms the radiating structures, and establishes the geometric progression ratios all in one pass. This universal approach eliminates the need for separate fabrication processes for each component.
2Reliability
If traditional multi-layer SIW antenna structures are manufactured, then antenna performance is achieved, but manufacturing cost increases
Solution Approach 1:
The invention merges the fabrication of the SIW distribution network and radiating structures into a single milling operation. This consolidation eliminates multiple manufacturing steps, reducing both time and cost while maintaining the precise geometric relationships needed for antenna performance.
Solution Approach 2:
The milling operation is programmed with preliminary calculations of the geometric progression ratios and layer dimensions before fabrication begins. All critical dimensions and positions are pre-determined through computational design, allowing the milling process to execute precisely without requiring post-manufacturing adjustments or quality control iterations.
3Ease of operation
If conventional SIW antennas are designed, then basic functionality is provided, but bandwidth is limited
Solution Approach 1:
The patent implements a geometric progression ratio across the antenna layers that dynamically adjusts the electromagnetic field distribution. This progressive geometric scaling allows the antenna to adapt to different frequency components within the millimeter wave range, enabling wideband operation rather than being restricted to a single narrow frequency band.
Solution Approach 2:
The invention changes the key parameter of layer spacing and radiating element dimensions according to a geometric progression relationship. By systematically varying these parameters across multiple layers, the antenna achieves wideband functionality covering 30-300 GHz, transforming the fixed-parameter conventional design into a variable-parameter wideband structure.
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 design results in a lightweight, mechanically robust antenna with improved bandwidth and reduced manufacturing complexity, capable of operating in the 30-300 GHz range, including 60 GHz and 70/80 GHz frequencies, with tight integration of RF-circuits and duplex filters.
Implementation Method 1
Microwave signals are arranged to propagate along the SIW longitudinal extension in a confinement limited by at least the first metal layer, the second metal layer, the first electric wall element and the second wall element
Implementation Method 2
for each radiating arrangement, at least one coupling aperture in the first metal layer
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An antenna arrangement (1) comprising a SIW (2) with at least one radiating arrangement (3). The SIW comprises a dielectric material (4), a first and second metal layer (5, 6) and a first and second electric wall element (7a, 7b) running essentially parallel and electrically connecting the metal layers (5, 6). For each radiating arrangement (3), the antenna arrangement (1) comprises at least one coupling aperture (8) in the first metal layer (5), and for each coupling aperture (8) there is a third wall element (7c) running between the first and second electric wall elements (7a, 7b), across a SIW longitudinal extension (es). For each radiating arrangement (3), the antenna arrangement (1) further comprises an at least partly electrically conducting antenna component (9) which comprises at least four radiating elements (10a, 10b, 10c, 10d) and is surface-mounted on the first metal layer (5), enclosing at least one coupling aperture (8). For each radiating arrangement (3), electromagnetic signals are arranged to be transmitted between said coupling aperture (8) and said radiating elements (10a, 10b, 10c, 10d).