Broadband Power Splitter With Variable Capacitance for RF Isolation
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Solution Overview
Problem
Conventional radio-frequency (RF) power splitters, such as Wilkinson splitters, fail to maintain adequate output isolation across wide frequency ranges like the mid-band (1.8 GHz-2.2 GHz), which is essential for carrier aggregation operations in RF applications, due to their narrowband nature and inability to support broadband frequency responses.
Innovation Solution
A power splitter design featuring variable capacitance in each signal path, implemented with capacitances in parallel and controlled by switches, allowing for multiple capacitance values and enabling broadband frequency responses by adjusting capacitance values based on control signals, thereby achieving high isolation and insertion loss across a wide band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Wilkinson splitters are used, then narrowband frequency response is achieved, but broadband isolation and carrier aggregation support are lost
Solution Approach 1:
The patent applies dynamics by making the capacitance values adjustable through control signals. The capacitance in each signal path can be dynamically changed to match different frequency bands, enabling the splitter to adapt from narrowband to broadband operation while maintaining reliable output isolation across the entire mid-band frequency range (1.8 GHz-2.2 GHz).
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the signal paths to optimize performance across different frequency bands. By adjusting capacitance parameters based on control signals corresponding to different carrier aggregation configurations, the splitter achieves both broadband coverage and maintained isolation characteristics.
2Adaptability or versatility
If fixed capacitance values are used, then simple circuit design is maintained, but broadband frequency response and carrier aggregation support are reduced
Solution Approach 1:
The patent introduces dynamic control capability where capacitance values can be adjusted based on operational requirements. Control signals received from external circuits enable the splitter to adapt to different frequency bands and carrier aggregation modes, transforming a static circuit into a dynamically configurable one that balances versatility with manageable complexity.
Solution Approach 2:
The patent creates a universal power splitter that can handle multiple frequency bands and carrier aggregation configurations through a single device. The ability to receive control signals and adjust capacitance values allows one circuit to perform multiple functions across different operating conditions, reducing the need for multiple dedicated 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
The solution provides enhanced broadband isolation and insertion loss characteristics, supporting carrier aggregation operations by adjusting capacitance values to match specific frequency bands, ensuring effective signal processing across a wide frequency range.
Implementation Method 1
Each of the first and second signal paths includes a variable capacitance configured to provide a plurality of capacitance values that result in different frequency responses of the respective signal path
Data Source
AI summary
A broadband power splitter can include an input port, a first output port and a second output port. The power splitter can further include a first signal path implemented between the input port and the first output port, and a second signal path implemented between the input port and the second output port. Each of the first and second signal paths can include a variable capacitance configured to provide a plurality of capacitance values that result in different frequency responses of the respective signal path.