Signal Transmission Line Stub Design for Reactance Control
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Solution Overview
Problem
High-frequency modulation signals in optical communication systems often experience dips in frequency characteristics due to large stubs in signal transmission lines, which affect reactance and impedance matching.
Innovation Solution
A signal transmission line design featuring a dielectric substrate with a signal line, a conductive layer, and a stub with multiple straight areas and openings, where the stub is electrically connected to the signal line and includes a conductor part extending in parallel, reducing reactance and suppressing dips in frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large area stub is formed to obtain large reactance, then reactance is improved, but dips are generated in frequency characteristics
Solution Approach 1:
The stub is divided into multiple straight areas (first straight area, second straight area, third straight area) connected in series, each contributing to the total reactance. This segmentation allows achieving the required large reactance value while distributing the stub's electrical length, thereby suppressing dips in frequency characteristics that would occur with a single large-area stub.
2Reliability
If a large area stub is formed to obtain large reactance, then reactance is improved, but the device area increases
Solution Approach 1:
Instead of increasing stub area in two dimensions, the design extends the stub in one dimension (length) by creating multiple straight areas connected in series. The total reactance is achieved through the cumulative electrical length of these segments rather than through area expansion, thus maintaining a compact footprint while obtaining the required large reactance.
Data Source
AI summary
A signal transmission line is disclosed. The signal transmission line includes a dielectric substrate, a signal line formed on a first surface of the dielectric substrate, a first conductive layer formed on a second surface of the dielectric substrate, and a first stub formed on the first surface of the dielectric substrate, the first stub being electrically connected with the signal line. The first stub includes a plurality of straight areas each extending from a different position of the signal line, a conductor part extending in parallel with the signal line, the conductor part being electrically connected with straight areas, a projection part connected with the conductor part, the projection part extending from the conductor part, and an opening provided between the conductor part and the signal line.