Waveguide-Microstrip Converter Hole Structure for Wider Band Matching
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Solution Overview
Problem
Waveguide-microstrip line converters face challenges in balancing the reduction of unnecessary electromagnetic radiation from slots and the widening of the usable frequency band due to wide line widths causing impedance mismatch and sharp impedance changes.
Innovation Solution
A waveguide-microstrip line converter with a conversion section featuring a hole and varying line widths to reduce electromagnetic radiation and impedance mismatch, incorporating impedance transformers for impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the line width of the conversion section is made wider, then unnecessary electromagnetic radiation from the slot is reduced, but the difference between the characteristic impedance of the conversion section and the microstrip lines increases, causing the impedance transformers to need matching for sharp impedance changes and narrowing the usable frequency band
Solution Approach 1:
The patent introduces a hole in the conversion section of the line conductor, which changes the electromagnetic parameters (characteristic impedance and effective dielectric constant) of the conversion section. This parameter change allows the conversion section to have a characteristic impedance that is intermediate between the slot and the microstrip lines, thereby reducing the impedance mismatch and enabling a wider usable frequency band while maintaining reduced electromagnetic radiation from the slot
2Object-generated harmful factors
If the line width of the conversion section is made wider, then unnecessary electromagnetic radiation from the slot is reduced, but the difference between the line width of the conversion section and the microstrip lines increases, requiring more complex impedance matching
Solution Approach 1:
By introducing a hole in the conversion section, the patent changes the electromagnetic parameters to achieve a more gradual impedance transition. This reduces the sharpness of impedance changes, thereby simplifying the impedance matching requirements and reducing the complexity of the impedance transformers needed
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 converter achieves reduced electromagnetic radiation and widened frequency band while maintaining high electrical performance and stability, simplifying manufacturing and reducing costs.
Implementation Method 1
the wider the line width of the conversion section is made, the more unnecessary electromagnetic radiation from the slot can be reduced
Implementation Method 2
an impedance transformer provided between the conversion section and the microstrip line, for performing impedance matching between the conversion section and the microstrip line
Data Source
AI summary
A waveguide-microstrip line converter includes a waveguide having an open end, a dielectric substrate having a first surface facing the open end and a second surface facing the opposite direction to the first surface, a ground conductor provided on the first surface and connected to the open end, the ground conductor being provided with a slot in a region enclosed by the end face of the open end, and a line conductor provided on the second surface. The line conductor includes a conversion section that performs power conversion between the line conductor and the waveguide, a microstrip line-provided at a distance from the conversion section in a first direction, and an impedance transformer provided between the conversion section and the microstrip line, for performing impedance matching between the conversion section and the microstrip line. A hole is formed in the conversion section.