Tunable Notch Filters With Coupled Inductors for 5G Harmonic Rejection
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Solution Overview
Problem
Harmonic rejection specifications in 5G New Radio (NR) technology are challenging due to increased integration of signals across multiple bands, requiring numerous switches that are costly and inefficient.
Innovation Solution
The implementation of tunable filters with mutually coupled inductors and a tunable impedance circuit, utilizing switches to adjust capacitance and inductance for enhanced harmonic rejection, allowing for more tunable states with reduced switch die area and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If numerous switches are used to achieve harmonic rejection specifications in 5G NR, then the harmonic rejection capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple filter functions into a single integrated filter structure that can handle multiple harmonics simultaneously. The filter uses a unified resonant circuit design with coupled resonators that can reject multiple harmonic frequencies without requiring separate switches for each harmonic, thereby reducing overall device complexity while maintaining harmonic rejection capability.
Solution Approach 2:
The filter is designed as a universal solution that can reject multiple different harmonic frequencies through a single device. By using coupled resonators with specific coupling coefficients, the filter can be configured to reject various harmonic orders (2nd, 3rd, 4th, etc.) without requiring additional switches, making it a multi-functional component that addresses multiple harmonic rejection needs simultaneously.
2Reliability
If numerous switches are used to achieve harmonic rejection specifications in 5G NR, then the harmonic rejection capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple filter functions into a single integrated filter structure that can handle multiple harmonics simultaneously. The filter uses a unified resonant circuit design with coupled resonators that can reject multiple harmonic frequencies without requiring separate switches for each harmonic, thereby reducing overall device complexity while maintaining harmonic rejection capability.
Solution Approach 2:
The filter is designed as a universal solution that can reject multiple different harmonic frequencies through a single device. By using coupled resonators with specific coupling coefficients, the filter can be configured to reject various harmonic orders (2nd, 3rd, 4th, etc.) without requiring additional switches, making it a multi-functional component that addresses multiple harmonic rejection needs simultaneously.
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 improved harmonic rejection capabilities with reduced switch count, achieving up to twice as many harmonic states as previous designs, while maintaining low insertion loss and meeting stringent 5G NR specifications.
Implementation Method 1
The second tunable filter can include a first inductor, a second inductor mutually coupled to the first inductor, and a tunable capacitance circuit coupled to the first inductor
Implementation Method 2
a tunable capacitance circuit coupled to the first inductor
Implementation Method 3
The first tunable filter has at least a first tunable notch. The second tunable filter having at least a second tunable notch
Data Source
AI summary
Aspects of this disclosure relate to a radio frequency system with tunable notch filtering. The radio frequency system includes a first tunable filter and a second tunable filter. The first tunable filter is coupled between an output of a power amplifier and a radio frequency switch. The second tunable filter includes mutually coupled inductors and a tunable impedance circuit electrically connected to at least one of the mutually coupled inductors. The second tunable filter is coupled between an antenna switch and an antenna node. Related methods and wireless communication devices are also disclosed.