SIW Transition With Open-Loop Transformer for Low-Loss PCB Coupling
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Solution Overview
Problem
Existing transmission line systems face challenges in efficiently coupling electromagnetic energy between different mediums, such as waveguides and microstrip transmission lines, particularly at high frequencies, leading to significant insertion and radiation losses, and often require complex and bandwidth-limited baluns for single-ended transitions.
Innovation Solution
The development of substrate integrated waveguide (SIW) transitions with a dielectric substrate and metallic layer portions, including a single-ended termination, impedance transformer, and metallic rectangular patch, along with metallic via-holes, enables efficient energy coupling between waveguides and PCB transmission lines without the need for baluns, using simplified PCB etching techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional transmission line systems are used to couple waveguides and microstrip transmission lines, then the system structure is simple, but significant insertion and radiation losses occur at high frequencies
Solution Approach 1:
The patent introduces a substrate integrated waveguide (SIW) transition structure as an intermediary component between the waveguide and microstrip transmission line. This SIW transition includes a dielectric substrate with metallic via-holes forming a waveguide-like structure that couples the two different transmission mediums, enabling efficient energy transfer while reducing insertion and radiation losses at high frequencies
Solution Approach 2:
The SIW transition structure employs composite construction combining dielectric substrate material with metallic layer portions and metallic via-holes. This composite structure integrates the advantages of both dielectric and conductive materials to achieve low-loss electromagnetic energy propagation while maintaining a compact form factor
2Adaptability or versatility
If baluns are used for single-ended transitions, then the transition can be achieved, but the device complexity increases and bandwidth is limited
Solution Approach 1:
The patent extracts and eliminates the need for baluns from the single-ended transition structure by directly designing the SIW transition to accommodate single-ended microstrip lines. This removal of the balun component simplifies the overall device complexity while simultaneously expanding the operational bandwidth of the transition structure
3Reliability
If complex transition elements are used to couple different transmission mediums, then coupling efficiency can be improved, but the device complexity increases
Solution Approach 1:
The SIW transition structure serves multiple functions simultaneously: it acts as an impedance transformer, a waveguide connector, and a single-ended to differential line adapter. This multi-functionality achieves high coupling efficiency between different transmission mediums while maintaining relatively simple device complexity, as the same structure performs multiple coupling tasks
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 solution provides low-loss, broadband SIW transitions for efficient electromagnetic energy propagation between different transmission mediums, reducing complexity and insertion losses, and is suitable for high-frequency applications like 5G and vehicle radar systems.
Implementation Method 1
substrate integrated waveguide (SIW) transitions that can be used to electrically couple a waveguide to another component, such as a microstrip or another type of transmission line
Implementation Method 2
an impedance transformer, and a metallic rectangular patch located within an open portion in the first metallic layer portion
Data Source
AI summary
Example embodiments relate to substrate integrated waveguide (SIW) transitions. An example SIW may include a dielectric substrate having a top surface and a bottom surface and a first metallic layer portion coupled to the top surface of the dielectric substrate that includes a single-ended termination, an impedance transformer, and a metallic rectangular patch located within an open portion in the first metallic layer portion such that the open portion forms a non-conductive loop around the metallic rectangular patch. The SIW also includes a second metallic layer portion coupled to the bottom surface of the dielectric substrate and metallic via-holes electrically coupling the first metallic layer to the second metallic layer. The SIW may be implemented in a radar unit to couple antennas to a printed circuit board (PCB). In some examples, the SIW may be implemented with only a non-conductive opening that lacks the metallic rectangular patch.