RF Module Layout for Multiband Signal Loss and Isolation
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Solution Overview
Problem
The increasing complexity of radio-frequency front-end modules in mobile communication devices leads to degradation of electrical characteristics such as noise figure and gain characteristics.
Innovation Solution
A radio-frequency module design with specific component arrangements, including power amplifiers, filters, and switches, where the distance between certain components is optimized to minimize signal degradation by reducing line lengths and stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power amplifiers and filters are arranged on a module substrate for multiband communication, then communication functionality is improved, but electrical characteristics (noise figure and gain) are degraded
Solution Approach 1:
The patent applies local quality by differentiating the arrangement strategy for different communication bands. High-band power amplifiers are positioned closer to the antenna connection terminal than low-band power amplifiers, creating non-uniform spatial distribution that optimizes electrical characteristics for each band's specific requirements while maintaining multiband functionality
Solution Approach 2:
The patent employs asymmetry in the physical layout of components on the module substrate. The distances from the antenna connection terminal to high-band and low-band power amplifiers are intentionally made different, breaking the symmetric arrangement that would otherwise be simpler to manufacture. This asymmetric positioning reduces stray capacitance effects and improves noise figure and gain characteristics
2Reliability
If power amplifiers are positioned closer to the antenna connection terminal, then electrical characteristics are improved, but device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by applying local quality - different regions of the module substrate have different component density and arrangement patterns. The high-band section near the antenna terminal has a specific compact layout optimized for electrical performance, while other regions follow different arrangement patterns, allowing optimization without requiring complete redesign of the entire module
Data Source
AI summary
A radio-frequency module includes a switch; power amplifiers; a transmission filter that has a passband including a transmission band of a communication band A included in a communication band group X and that has one end connected to an antenna connection terminal via the switch and the other end connected to an output of the power amplifier; a transmission filter that has a passband including a transmission band of a communication band C included in a communication band group Y lower than the communication band group X and that has one end connected to the antenna connection terminal via the switch and the other end connected to an output of the power amplifier; and a module substrate. In a plan view of the module substrate, a distance between the power amplifier and the switch is shorter than a distance between the power amplifier and the switch.