Variable-Capacitance RF Power Splitter for Broadband Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RF power splitters, such as Wilkinson splitters, fail to maintain adequate output isolation across wide frequency bands like 1.8 GHz to 2.2 GHz, leading to performance degradation and inability to meet minimum 25 dB output isolation requirements.
Innovation Solution
A power splitter design incorporating variable capacitances and inductances in series with a control circuit to adjust capacitance values, allowing for different frequency responses and isolation characteristics, enabling broadband isolation and supporting carrier aggregation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF power splitters (e.g., Wilkinson splitters) are used, then the device structure is simple and easy to manufacture, but the output isolation deteriorates across wide frequency bands (failing to meet 25 dB minimum requirement)
Solution Approach 1:
The patent applies dynamics by making the capacitance values adjustable through control circuits. The capacitance elements can be dynamically changed based on the operating frequency band, allowing the power splitter to adapt its electrical characteristics. This dynamic adjustment enables the maintenance of adequate output isolation (≥25 dB) across wide frequency bands (1.8 GHz to 2.2 GHz) while managing the increased structural complexity through systematic design.
Solution Approach 2:
The patent implements parameter changes by varying the capacitance values in the signal paths according to the operating frequency. Different capacitance values are selected for different frequency bands to optimize the isolation performance. This parameter adjustment approach allows the same physical structure to achieve reliable output isolation across multiple frequency bands by changing only the electrical parameters rather than the physical structure.
2Adaptability or versatility
If fixed capacitance values are used in the signal paths, then the device complexity is reduced, but the adaptability to different frequency bands deteriorates
Solution Approach 1:
The patent makes the capacitance values dynamic and adjustable through control circuits that can switch between different capacitance elements based on the operating frequency band. This dynamic capability enables the power splitter to adapt to different frequency bands (including carrier aggregation scenarios) while the control logic manages the complexity of switching between capacitance values.
Solution Approach 2:
The patent achieves universality by designing a single power splitter structure that can operate across multiple frequency bands (1.8 GHz to 2.2 GHz) and support carrier aggregation operations. The adjustable capacitance elements allow the same device to serve multiple frequency band requirements, making it a multi-functional component that replaces what would otherwise require multiple fixed-frequency splitters.
3Reliability
If variable capacitances are introduced to achieve broadband isolation, then the frequency response adaptability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent achieves broadband isolation (≥25 dB from 1.8 GHz to 2.2 GHz) by adjusting capacitance parameters rather than requiring precise physical manufacturing tolerances. The control circuits select from predetermined capacitance values, which reduces the need for high manufacturing precision in the physical components. The precision is achieved through electrical selection rather than mechanical tolerance control.
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 achieves high isolation properties over a wide band, maintaining system linearity and reducing implementation loss, effectively covering multiple frequency bands within the 1.8 GHz to 2.2 GHz range with improved insertion loss and isolation performance.
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
Implementation Method 2
Each of the first and second signal paths can further include an inductance L that couples a node between C1 and C2 to a ground
Data Source
AI summary
Radio-frequency splitter circuits, devices and methods. In some embodiments, a 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.