High-Frequency Line Connection Structure with Protrusion for Signal Integrity
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Solution Overview
Problem
Conventional high-frequency line connection structures between coaxial and planar lines suffer from high return loss and insertion loss due to asymmetrical ground conductive films, which disrupt the symmetry of electric field lines and degrade high-frequency characteristics.
Innovation Solution
A high-frequency line connection structure with a coaxial line and a planar line, where the coaxial line features a circular cross-section inner conductor and a columnar outer conductor with an insulation layer, and the planar line has a substrate with asymmetrical ground conductive films and a protrusion structure on a conductive base, ensuring symmetrical electric field lines and improved connection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If asymmetrical ground conductive films are used in the planar line connection structure, then the structure can accommodate offset signal lines, but the electric field symmetry is disrupted causing high return loss and insertion loss
Solution Approach 1:
The invention intentionally introduces asymmetry through the protrusion structure to compensate for the inherent asymmetry of the offset signal line. The protrusion is positioned closer to one ground conductive film than the other, creating an asymmetrical electric field distribution that balances the overall field symmetry at the connection point, thereby reducing return loss and insertion loss while accommodating the offset signal line configuration
2Adaptability or versatility
If the signal line is positioned offset from the center line, then component placement flexibility is improved, but ground conductive film asymmetry causes degraded high-frequency characteristics
Solution Approach 1:
The invention applies local quality by creating a non-uniform distribution of the conductive base material through the protrusion structure. The protrusion provides enhanced conductivity and field control in the specific region where the offset signal line connects to the coaxial line, locally compensating for the asymmetry and maintaining high-frequency characteristics despite the offset positioning
Data Source
AI summary
A high-frequency line connection structure connects a coaxial line and a planar line. The high-frequency line connection structure includes a conductive base that is formed into a planar shape having a length that matches a length of the planar line along a lengthwise direction of a substrate, where the planar line is disposed on a surface of the conductive base, and a protrusion structure provided in a region, on the surface of the conductive base, adjacent to the coaxial line, the protrusion structure protruding from the surface of the conductive base, where the protrusion structure is in contact with a side surface of a region along the lengthwise direction of the substrate, where a ground conductive film with a smaller width out of a pair of ground conductive films of the planar line, is formed.