High-Frequency Switch Module Harmonic Cancellation
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Solution Overview
Problem
High-frequency switch modules face challenges in effectively attenuating harmonic signals radiated from antennas without increasing the number of components, as existing solutions require additional phase shifting units that are precision-dependent and result in larger module sizes.
Innovation Solution
A high-frequency switch module configuration that includes a filter circuit with an inductor connected in series between the transmission signal input terminal and the switch device, ensuring a 180° phase difference between harmonic signals and distortion harmonic signals, thereby canceling them out, without the need for additional components like phase shifting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase shifting unit is connected between the switch device and the low pass filter to cancel harmonic signals, then harmonic signal attenuation is improved, but the number of constituent components increases and the module size increases
Solution Approach 1:
The patent combines the phase shifting function with the existing low pass filter by configuring the filter's electrode pattern to inherently provide the necessary phase shift. Instead of adding a separate phase shifting unit, the low pass filter's structure is designed so that its electrodes create the required phase difference between harmonic signals and transmitted signals, thereby canceling harmonics while avoiding additional components.
Solution Approach 2:
The low pass filter is designed to serve multiple functions: it filters out high-order harmonics and simultaneously provides the phase shift needed for harmonic cancellation. By making the filter circuit itself perform the phase shifting function through its electrode configuration, the patent eliminates the need for a dedicated phase shifting unit, reducing component count while maintaining harmonic attenuation effectiveness.
2Reliability
If a phase shifting unit is added to cancel harmonic signals, then harmonic signal attenuation is improved, but the module size increases
Solution Approach 1:
The patent merges the phase shifting function into the existing low pass filter structure. The filter's electrode pattern is configured to provide the necessary phase shift, eliminating the need for a separate phase shifting unit that would increase module size. This integration maintains harmonic cancellation effectiveness while minimizing the overall module volume.
3Reliability
If high precision electrode pattern is formed to achieve phase shift, then harmonic signal cancellation is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent optimizes the electrode pattern parameters of the low pass filter to achieve the necessary phase shift with reduced precision requirements. By carefully designing the electrode configurations and their dimensions, the filter provides effective harmonic cancellation without requiring extremely high manufacturing precision, thereby balancing performance with manufacturability.
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 reliably attenuates harmonic signals, reducing the module size and complexity while maintaining effective harmonic cancellation, even with lower precision electrode patterns, and improves the Q factor and attenuation characteristics of the filter.
Implementation Method 1
The filter circuit includes an inductor connected in series between the transmission signal input terminal and the first individual port and that attenuates a harmonic signal of a transmission signal
Implementation Method 2
a phase of a distortion harmonic signal generated due to distortion in the switch device is different by 180° from a phase of the harmonic signal of the transmission signal at an end of the filter circuit nearer to the transmission signal input terminal
Data Source
AI summary
A low pass filter connected between an individual port of a switch device and a high-frequency switch module attenuates the second harmonic and the third harmonic of a transmission signal input to a first transmission signal input terminal. Further, the inductances/capacitances of inductors and capacitors defining the low pass filter are set such that the phase of a harmonic signal generated by a power amplifier is different by 180° from the phase of a harmonic signal produced as a result of the low pass filter shifting the phase of a harmonic signal generated due to distortion in a switch device, in an end portion on the first transmission signal input terminal side.