Substrate Integrated Waveguide Slot Coupling for High-Frequency Signal Transfer
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Solution Overview
Problem
Existing surface mounted microwave signal systems face significant signal loss and limitations at higher frequencies, particularly above 40 GHz, due to the inefficiencies in transferring signals between a motherboard and a module using microstrip to Coplanar Waveguide connections.
Innovation Solution
A coupling arrangement utilizing Substrate Integrated Waveguide (SIW) technology with slot coupling, where a slot in the substrate integrated waveguide on the motherboard is connected to a slot in the module's ground plane via a thin connecting substance, allowing for efficient transfer of microwave signals with reduced losses, and optionally filled with dielectric material to minimize reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microstrip to Coplanar Waveguide connections are used for signal transfer, then the system can be manufactured using standard SMT processes, but signal loss increases significantly at frequencies above 40 GHz
Solution Approach 1:
The patent changes the transmission line parameter from Coplanar Waveguide to Substrate Integrated Waveguide (SIW) structure. This parameter change enables the system to maintain low signal loss at high frequencies (above 40 GHz) while still being compatible with standard SMT manufacturing processes, thus resolving the contradiction between ease of manufacture and signal loss.
Solution Approach 2:
The patent replaces the traditional Coplanar Waveguide transmission structure with a Substrate Integrated Waveguide (SIW) structure. This substitution fundamentally changes the electromagnetic field distribution and propagation characteristics, enabling low-loss signal transmission at millimeter wave frequencies while maintaining SMT manufacturing compatibility.
2Reliability
If Chip On Board (COB) solutions are used for frequencies above 60 GHz, then signal transmission capability is improved, but manufacturing complexity and repair difficulty increase
Solution Approach 1:
The patent introduces an intermediate SIW transmission structure that bridges the gap between traditional SMT and COB solutions. The SIW structure acts as an intermediary that enables high-frequency signal transmission (above 60 GHz) while maintaining standard SMT manufacturing processes and module packaging, thus avoiding the complexity and repair difficulties associated with direct COB solutions.
3Productivity
If standard SMT module connections are used, then manufacturing automation is maintained, but signal transmission efficiency deteriorates at high frequencies
Solution Approach 1:
The patent makes the SIW connection structure universal by designing it to be compatible with standard SMT manufacturing processes while simultaneously enabling high-efficiency signal transmission at millimeter wave frequencies. The SIW structure can be integrated into conventional SMT workflows, maintaining manufacturing automation while dramatically improving signal transmission efficiency compared to traditional Coplanar Waveguide connections.
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
Enables the automatic assembly of Surface Mount Device (SMD) modules for frequencies up to 100 GHz and beyond, providing lower signal loss and improved performance compared to prior art systems.
Implementation Method 1
A coupling arrangement 1 for transfer of a microwave signal between a motherboard 2 and a module 5
Implementation Method 2
the dielectric material has a relative permittivity within a range of +‑20% of the permittivity of the substrate of the motherboard or the module
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention concerns a coupling arrangement (1) for transfer of a microwave signal, the arrangement (1) comprising: - a motherboard (2) comprising a substrate (3) with a microstrip conductor (4), and - a module (5) comprising a substrate (6) with a microstrip conductor (7). Further, the module (5) is attached to the motherboard (2) such that the motherboard conductor (4) by means of a connection (17) is in electrical contact with the module conductor (7), whereby the microwave signal may be transferred between the motherboard conductor (4) and the module conductor (7). The invention is distinguished in that the connection (17) comprises the motherboard conductor (4) connected to a substrate integrated waveguide (8) on the motherboard (2), which substrate integrated waveguide (8) is connected to the module conductor (7) via a slot coupling (9).