Multilayer Triplexer With Non-Overlapping Coil Patterns
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Solution Overview
Problem
Existing triplexers suffer from signal mixing across bands due to stray capacitance between coil and capacitor components, leading to deteriorated performance and reliability.
Innovation Solution
A multilayer triplexer design with non-overlapping coil conductor patterns between substrate layers, eliminating parallel resonant circuits and strategically arranging coil patterns to minimize stray capacitance, thereby preventing signal mixing between bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallel resonant circuits with capacitors are used in existing triplexers, then impedance adjustment is achieved, but signal mixing between bands occurs due to stray capacitance
Solution Approach 1:
The patent removes capacitors from the parallel resonant circuits, extracting the harmful stray capacitance that causes signal mixing between bands. The design uses only coil conductor patterns without capacitors, eliminating the source of the harmful effect while maintaining impedance adjustment functionality through the coil structures alone.
Solution Approach 2:
The patent converts the harmful stray capacitance effect into a beneficial design by deliberately designing the coil conductor patterns to have controlled parasitic capacitance that aids in impedance matching. The coil patterns are configured to provide both inductance and controlled capacitance, turning what was previously a harmful unintended effect into a useful design feature.
2Area of stationary object
If coil and capacitor components are placed close together, then compact design is achieved, but signal mixing increases due to stray capacitance
Solution Approach 1:
The patent removes capacitors from the circuit design, extracting the component that was causing stray capacitance issues. By eliminating capacitors entirely and using only coil conductor patterns, the design achieves compact size without the harmful stray capacitance that would result from placing capacitors close to coils.
3Reliability
If capacitors are used in parallel resonant circuits, then impedance adjustment is achieved, but signal paths become mixed across frequency bands
Solution Approach 1:
The patent removes capacitors from the parallel resonant circuits, extracting the component that causes signal paths to mix across frequency bands. The capacitorless design using only coil conductor patterns maintains distinct signal paths for different frequency bands, preventing signal leakage and maintaining signal integrity.
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 design effectively reduces stray capacitance, ensuring clear signal paths and improved reliability by preventing signal mixing across different frequency bands, resulting in enhanced performance and frequency characteristics.
Implementation Method 1
a first coil connected between the common terminal and the first filter; a second coil connected between the common terminal and the second filter; and a third coil connected between the common terminal and the third filter. The first to third coils each include a coil conductor pattern between ones of the substrate layers
Implementation Method 2
The coil conductor pattern of the first coil, the coil conductor pattern of the second coil, and the coil conductor pattern of the third coil do not overlap each other when the multilayer is viewed in the direction in which the substrate layers are stacked on one another
Data Source
AI summary
A multilayer triplexer includes a first coil connected between a common terminal and a first filter, a second coil connected between the common terminal and a second filter, and a third coil connected between the common terminal and the third filter. The first coil, the second coil, and the third coil each include a coil conductor pattern between ones of substrate layers of a multilayer body. The coil conductor pattern of the first coil, the coil conductor pattern of the second coil, and the coil conductor pattern of the third coil do not overlap each other when the multilayer body is seen through in a direction in which the substrate layers are stacked on one another.