High-Frequency Switch Module Harmonic Suppression
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Solution Overview
Problem
Existing high-frequency switch modules using FET switches suffer from harmonic distortion and miniaturization challenges, leading to increased power consumption and decreased response speed, especially as the number of ports increases.
Innovation Solution
A high-frequency switch module with a FET switch and a phase setting element that shifts the impedance of the filter side towards zero for higher-order harmonics, reducing harmonic reflection and output, while maintaining fundamental signal integrity, and is integrated into a laminated body for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a low-pass filter is used to attenuate harmonics in a FET switch module, then harmonic distortion is reduced, but the impedance approaches infinity causing complete reflection of harmonics back to the FET switch
Solution Approach 1:
A phase setting element is introduced as an intermediary component between the FET switch and the low-pass filter. This element transforms the impedance from an open state (infinity) to a short state (zero) for harmonic frequencies, allowing harmonics to be discharged to ground through the capacitor rather than reflected back to the FET switch.
Solution Approach 2:
The phase setting element changes the impedance parameter of the filter side with respect to harmonic frequencies. By transforming the impedance from infinity to zero, it fundamentally alters how harmonics are handled - from complete reflection to complete discharge to ground, thereby eliminating the harmful feedback loop.
2Adaptability or versatility
If the number of ports in the FET switch is increased to support multiple frequency bands, then communication versatility is improved, but power consumption increases and response speed decreases
Solution Approach 1:
The solution segments the harmonic suppression function from the main FET switch structure by adding independent phase setting elements to each port. This allows each port to be optimized independently for harmonic suppression without affecting other ports, enabling multi-band operation with reduced overall power consumption compared to a monolithic approach.
3Adaptability or versatility
If the number of ports in the FET switch is increased to support multiple frequency bands, then communication versatility is improved, but device size increases making miniaturization difficult
Solution Approach 1:
The phase setting element merges multiple functions into a single component: impedance transformation, harmonic frequency targeting, and ground discharge routing. This consolidation allows the harmonic suppression mechanism to be integrated compactly without requiring separate components for each function, facilitating miniaturization while supporting multiple frequency bands.
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 significantly reduces harmonic output and prevents complete reflection, achieving a miniaturized high-frequency switch module with reduced power consumption and improved response speed across multiple frequency bands.
Implementation Method 1
a phase setting element which shifts an impedance of the filter side viewed from the transmission input port with respect to the higher-order harmonic toward zero
Implementation Method 2
a low-pass filter to attenuate harmonics of the first and second transmission signals
Data Source
AI summary
A FET switch enables an antenna input/output port connected to an antenna to connect to any of a port connected to a transmission signal input terminal and ports respectively connected to two reception signal output terminals by switching between the ports. After a transmission signal is input through the transmission signal input terminal and is then input from the port to the FET switch, harmonic distortion occurs and is output to the transmission signal input terminal side. A phase setting element connected to the port changes an impedance of the input side viewed from the port with respect to harmonics from an open state to a short-circuited state, so as to disperse the harmonics. Accordingly, harmonics returning to the port are greatly suppressed and minimized.