RF Front-End Module Resonator Layout for Second-Harmonic Suppression
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Solution Overview
Problem
Existing wireless front-end architectures face challenges in efficiently managing signal power and reducing harmonic interference, particularly in achieving resonance at second harmonic frequencies.
Innovation Solution
The method involves manufacturing an inductive coupled resonator by printing primary and secondary inductor coils and a parallel plate capacitor on a printed circuit board, and tuning these components to achieve resonance at a second harmonic frequency, thereby suppressing second-order harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional filtering methods are used to suppress harmonics, then harmonic suppression may be achieved, but in-band signal loss and impedance mismatch increase
Solution Approach 1:
The patent converts the harmful second harmonic signals into a beneficial resonance mechanism. By designing an inductive coupled resonator that resonates at the second harmonic frequency, the harmful harmonics are absorbed and dissipated as heat in the resonator's resistive elements, while the fundamental band signals pass through unaffected. This transforms the harmful harmonic energy into a controlled resonance phenomenon that eliminates interference without causing signal loss.
Solution Approach 2:
The inductive coupled resonator acts as an intermediary element between the power amplifier and the antenna. It selectively interacts with second harmonic frequencies through magnetic coupling between primary and secondary inductors, while being transparent to fundamental frequency signals. This intermediary structure provides harmonic suppression without introducing impedance mismatch or insertion loss in the operational band.
2Object-generated harmful factors
If complex resonator structures are implemented to achieve second harmonic resonance, then harmonic suppression improves, but device complexity increases
Solution Approach 1:
The patent merges the resonator structure with existing circuit elements. The primary inductor is integrated into the existing RF signal path, and the secondary inductor is coupled magnetically without requiring direct physical connection or additional complex components. The capacitor is formed using standard PCB techniques. This merging approach achieves second harmonic resonance while maintaining structural simplicity and avoiding additional complexity.
Solution Approach 2:
The patent uses magnetic coupling in the spatial domain between primary and secondary inductors to achieve frequency selectivity. By positioning the inductors in close proximity with appropriate orientation, magnetic flux coupling creates the resonant interaction at second harmonic frequencies without requiring complex multi-dimensional structures or additional layers of complexity.
3Object-generated harmful factors
If inductive coupled resonator is added to suppress harmonics, then harmonic suppression is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces traditional mechanical or discrete component-based resonator implementations with a printed circuit board-based implementation. The inductors are formed using standard PCB trace techniques, and the capacitor is created using PCB fabrication methods. This substitution eliminates complex mechanical assembly, alignment, and tuning processes, making the resonator easy to manufacture using conventional PCB manufacturing techniques.
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 effectively suppresses second-order harmonics and improves the in-band performance of the radio frequency front-end module by minimizing impedance mismatch and insertion loss.
Implementation Method 1
a secondary inductor coil inductively coupled to the primary inductor coil
Implementation Method 2
tuning the secondary inductor coil and the parallel plate capacitor to achieve resonance at a second harmonic frequency
Data Source
AI summary
A method of manufacturing a radio frequency front end module includes mounting a low-noise amplifier and a receive filter to a substrate in a receive path of the radio frequency front end module. The receive filter is connected between the low-noise amplifier and a first port configured for connection to an antenna. The method also includes mounting a power amplifier and a transmit filter to the substrate in a transmit path of the radio frequency front end module. In addition, the method includes forming an inductive coupled resonator connected between the transmit filter and the first port, the transmit filter connected between the inductive coupled resonator and the power amplifier.