RF Front-End Inductive Coupled Resonator for Harmonic Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless front-end architectures face challenges in efficiently managing signal power and suppressing harmonics, particularly second-order harmonics, which can lead to interference and reduced performance.
Innovation Solution
The proposed solution involves a radio frequency front-end module that includes an antenna switch module, a receive path with a low-noise amplifier and a receive filter, and a transmit path with a power amplifier, a transmit filter, and an inductive coupled resonator. The inductive coupled resonator is specifically configured to suppress second-order harmonics by using a primary inductor coil and a secondary inductor coil, which are tuned to resonate at the second harmonic frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a traditional filter is used to suppress second-order harmonics, then harmonic suppression is achieved, but impedance mismatch issues occur and in-band performance deteriorates
Solution Approach 1:
The filter is segmented into multiple resonator units, each targeting specific harmonic frequencies. The first resonator unit suppresses second-order harmonics while the second resonator unit suppresses third-order harmonics, allowing selective harmonic suppression without affecting in-band performance
Solution Approach 2:
An impedance transformation network is introduced as an intermediary component between the resonator units and the signal path. This network transforms the impedance to match the system characteristics, eliminating impedance mismatch issues while maintaining effective harmonic suppression
2Object-generated harmful factors
If a traditional filter is used to suppress harmonics, then harmonic suppression is achieved, but the device complexity increases
Solution Approach 1:
Multiple resonator units are merged into a single integrated filter structure. The first and second resonator units are combined with the impedance transformation network to form one cohesive device, reducing overall complexity while maintaining multiple suppression functions
Solution Approach 2:
The filter is designed with multi-functionality to suppress both second-order and third-order harmonics within a single device. The resonator units are configured to handle different harmonic frequencies, making the filter universally effective against multiple types of harmonic interference
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 configuration effectively suppresses second-order harmonics, improving signal quality and reducing interference, while maintaining in-band performance and avoiding impedance mismatch issues.
Implementation Method 1
an inductive coupled resonator connected between the transmit filter and the port of the antenna switch module... the inductive coupled resonator includes a primary inductor coil connected between the transmit filter and the antenna switch module... the inductive coupled resonator further includes a secondary inductor coil inductively coupled to the primary inductor coil
Implementation Method 2
The inductive coupled resonator is specifically configured to suppress second-order harmonics by using a primary inductor coil and a secondary inductor coil, which are tuned to resonate at the second harmonic frequency
Data Source
AI summary
A radio frequency front-end module includes an antenna switch module and a receive path including a low-noise amplifier and a receive filter. The receive filter is connected between a port of the antenna switch module and the low-noise amplifier. A first transmit path includes a power amplifier, a transmit filter, and an inductive coupled resonator. The inductive coupled resonator is connected between the transmit filter and the port of the antenna switch module. The transmit filter is connected between the inductive coupled resonator and the power amplifier.