Switchable Resonator Filter Topologies for Low-Loss 5G Multiplexers
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Solution Overview
Problem
Conventional switchable multiplexers suffer from substantial insertion losses, which are not effectively addressed in 5G cellular applications.
Innovation Solution
The implementation of adjustable filter topologies using switchable resonator circuits with reactive elements like inductors and capacitors, allowing for the adjustment of resonant and antiresonant frequencies, and the configuration of switchable resonators in parallel or series to minimize insertion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional switches are used in multiplexers, then switching functionality is achieved, but insertion loss increases by approximately 0.3 dB per switch
Solution Approach 1:
The patent extracts the switch from the main signal path by using switchable resonator circuits that can be selectively coupled into or out of the signal path. When a resonator is not needed, it is decoupled using switches, eliminating the continuous insertion loss that would occur if switches remained in the main path. This allows switching functionality while minimizing energy loss.
Solution Approach 2:
The patent introduces resonator circuits as intermediary elements between the input and output contacts. These resonators act as frequency-selective mediators that can be selectively engaged or disengaged. When engaged, they provide filtering at specific frequencies; when disengaged via switches, they allow signal passage with minimal loss, thus resolving the contradiction between switching capability and insertion loss.
2Reliability
If switchable resonator circuits are added to reduce insertion loss, then filtering performance is improved, but device complexity increases
Solution Approach 1:
The patent designs resonator circuits that serve multiple functions: they provide frequency-selective filtering when coupled into the signal path and act as transparent pathways when decoupled. Each resonator circuit can handle multiple frequency bands through switching, reducing the need for separate dedicated circuits for each function, thereby managing complexity while maintaining high filtering performance.
Solution Approach 2:
The patent employs dynamically switchable resonator circuits that can transition between coupled and decoupled states based on the required frequency band. This dynamic configuration allows the same physical circuit to adapt its functionality, providing complex filtering performance through coordinated switching of multiple resonators rather than requiring permanently configured complex circuits.
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
This approach reduces or eliminates insertion losses by selectively coupling resonators with reactive elements, enhancing the filtering characteristics and performance of switchable multiplexers in 5G applications.
Implementation Method 1
adjustment of resonant and antiresonant frequencies, and the configuration of switchable resonators in parallel or series to minimize insertion losses
Data Source
AI summary
An adjustable filter having a first contact; a second contact; and one or more switchable resonator circuits coupled between the first contact and the second contact, each switchable resonator circuit including a switch, a first impedance, and a resonator coupled in parallel with a second impedance, a parallel combination of the resonator and second impedance being coupled in series with the first impedance.