High-Frequency Switch Module Resonance Layout for Terminal Isolation
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Solution Overview
Problem
High frequency switch modules experience signal leakage between selection target terminals due to close proximity, leading to degradation in transmission characteristics, especially when harmonic frequencies of one communication band overlap with fundamental frequencies of another.
Innovation Solution
Incorporating a switch device with a filter and an inductor configuration that utilizes parallel resonance and capacitive coupling suppression, along with strategically positioned and shorter connection conductors, to enhance isolation between selection target terminals, and optionally using matching inductors and spiral inductor designs to optimize impedance and reduce capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If selection target terminals are arranged close to each other along one side of the housing, then the device size is reduced, but high frequency signal leakage occurs between terminals
Solution Approach 1:
A first inductor is introduced as an intermediary component connected between the first selection target terminal and the second selection target terminal. This inductor creates a parallel resonance circuit with the capacitor formed between the terminals, acting as a mediator to suppress signal leakage while allowing the terminals to remain in close proximity for miniaturization.
Solution Approach 2:
The invention changes the electrical parameters of the terminal arrangement by introducing reactive components (inductor and capacitor) that create resonance at specific frequencies. By adjusting the resonance frequency to match the harmonic frequency, the system transforms the harmful leakage into a controlled resonance condition that blocks the unwanted signal.
2Volume of moving object
If selection target terminals are positioned close to each other, then the device is miniaturized, but isolation characteristics between terminals deteriorate
Solution Approach 1:
The first inductor serves as an intermediary element that actively improves isolation characteristics by forming a parallel resonance circuit. This intermediary component compensates for the poor isolation that would naturally result from close terminal positioning, thereby enabling miniaturization without sacrificing reliability.
Solution Approach 2:
The filter device and inductor are configured to preemptively counteract the signal leakage problem before it affects system performance. By establishing the parallel resonance circuit in advance, the system proactively blocks harmonic frequency leakage between terminals, preventing isolation degradation rather than correcting it afterward.
3Adaptability or versatility
If harmonic frequency of first communication band overlaps with fundamental frequency of second communication band, then frequency utilization is optimized, but signal interference increases
Solution Approach 1:
The invention converts the harmful signal leakage at harmonic frequencies into a beneficial effect by tuning the parallel resonance circuit to resonate at the harmonic frequency. This transforms the unwanted leakage path into a high-impedance block, preventing interference while allowing the system to utilize overlapping frequency bands for improved spectral efficiency.
Solution Approach 2:
The system changes the electrical parameters of the terminal interface by introducing resonant circuits that dynamically alter the impedance characteristics at specific frequencies. This allows the system to maintain good isolation at harmonic frequencies while permitting frequency overlap, thereby resolving the interference problem without sacrificing frequency utilization efficiency.
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 effectively suppresses high frequency signal leakage, securing high isolation characteristics and maintaining excellent transmission performance while minimizing the module's size and complexity.
Implementation Method 1
the leakage of a high frequency signal between the first selection target terminal and the second selection target terminal is suppressed by parallel resonance of the first inductor and a capacitor generated between the first selection target terminal and the second selection target terminal
Implementation Method 2
a terminal of the filter device on the opposite side to the first and second selection target terminals is shared
Data Source
AI summary
A high frequency switch module (10) includes a switch device (20), a first inductor (30), and a filter device (40). The switch device (20) includes a shared terminal (P00) and selection target terminals (P02, P03) that are selectively connected to the shared terminal. The filter device (40) includes SAW filters (41, 42) connected to the selection target terminal (P02) and the selection target terminal (P03), respectively. A terminal of the SAW filters (41, 42) on the opposite side to the selection target terminals (P02, P03) is shared and connected to a front-end terminal (Pfe). The first inductor (30) is connected between the selection target terminal (P02) and the selection target terminal (P03).