RF Transmission Line Capacitive Isolation for Compact Antenna Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radiofrequency devices face challenges in achieving effective isolation of antennas while maintaining compact dimensions, as internal power supply circuits with galvanic isolation are often bulky and difficult to adapt due to fixed transformer properties.
Innovation Solution
A radiofrequency transmission line with a main conductor and ground plane, incorporating capacitors and voltage clipping circuits, allows for efficient isolation of low-frequency signals while enabling the transmission of radiofrequency signals, allowing for a non-isolated power supply and compact component usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal power supply circuits with galvanic isolation are used, then isolation safety is improved, but device volume increases
Solution Approach 1:
The patent extracts the isolation function from the traditional transformer-based power supply circuit and implements it separately through capacitive coupling in the transmission line. This allows the power supply to be non-isolated (reducing volume) while still achieving the required isolation safety through the capacitive blocks that prevent low-frequency signal passage between antenna and power supply.
Solution Approach 2:
The patent introduces capacitive coupling as an intermediary element in the transmission line. These capacitors act as mediators that allow radiofrequency signal transmission while blocking low-frequency isolation requirements, thereby achieving both compact size and safety isolation without requiring bulky transformer-based isolation circuits.
2Reliability
If transformers with fixed geometry are used for isolation, then isolation performance is improved, but adaptability deteriorates
Solution Approach 1:
The patent replaces static transformer-based isolation with dynamic capacitive coupling that can be easily adjusted for different applications. The capacitive blocks allow the system to adapt to various radiofrequency requirements without being constrained by fixed transformer geometry, enabling versatile deployment across different frequency ranges and application scenarios.
Solution Approach 2:
The patent enables parameter changes by using capacitive coupling instead of fixed transformers. The capacitance values can be selected and adjusted to optimize performance for different radiofrequency applications, allowing the system to adapt to varying isolation requirements without changing the fundamental architecture or requiring custom-designed transformers for each application.
3Speed
If antenna is placed outside housing for signal propagation, then signal transmission is improved, but isolation complexity increases
Solution Approach 1:
The patent makes the transmission line multi-functional by incorporating capacitive coupling that simultaneously serves as both a signal transmission medium and an isolation mechanism. This universal approach allows the same transmission line structure to handle both radiofrequency signal propagation and safety isolation requirements, eliminating the need for separate isolation components when the antenna is placed outside the housing.
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 solution effectively isolates the antenna from the power supply, enabling safe operation and using smaller components, while maintaining efficient radiofrequency signal transmission and protecting against electrocution risks.
Implementation Method 1
each first capacitor being inserted between two contiguous first portions, each first capacitor including a first electrode electrically connected to one of the first portions between which the first capacitor is inserted and a second electrode electrically connected to the other of the first portions
Data Source
AI summary
A radiofrequency transmission line configured so as to allow a radiofrequency electrical signal to be transmitted between a first end and a second end, the transmission line including a main conductor and a ground plane electrically connected to an electrical ground of the transmission line. The ground plane includes a set of portions that are connected in series between the first end and the second end and a set of second capacitors, the set of portions including a set of second portions, each second capacitor being inserted between two contiguous second portions.