RF Communication Device Layout for SAR and HBC Interference Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication devices face challenges in accommodating multiple circuit elements within limited space, leading to interference and reduced operational performance due to their close proximity.
Innovation Solution
A communication device design incorporating an RF module, integrated module with SAR and HBC modules, signal transmission line, and tuning circuits to minimize interference and maintain performance without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple circuit elements are placed close together to save space, then device size is reduced, but interference between elements increases
Solution Approach 1:
The patent divides the circuit board into multiple layers (first circuit board layer, second circuit board layer, third circuit board layer) and places different circuit elements on different layers. The HBC module is on the first layer, SAR sensor on the second layer, and RF module on the third layer. This vertical segmentation allows close packing while maintaining electrical isolation and reducing interference between elements.
Solution Approach 2:
The patent introduces a ground layer between the first circuit board layer (HBC module) and the second circuit board layer (SAR sensor). This ground layer acts as an intermediary that provides electrical isolation and shields the HBC module from interference from other components, while still allowing compact integration.
2Device complexity
If HBC module and SAR sensor are integrated closely, then device complexity is reduced, but signal interference increases
Solution Approach 1:
The patent places the HBC module and SAR sensor on different circuit board layers with a ground layer in between, creating physical and electrical separation. This segmentation maintains integration benefits while preventing signal interference between the two modules.
Solution Approach 2:
The ground layer serves as an intermediary barrier between the HBC module operating at low frequencies (1 MHz to 100 MHz) and the SAR sensor operating at higher frequencies (0.7 GHz to 7 GHz). This intermediary structure blocks harmful electromagnetic interference while allowing both modules to function together in an integrated design.
3Speed
If RF module power is increased to improve transmission distance, then communication range is extended, but interference to other modules increases
Solution Approach 1:
The ground layer acts as an intermediary shield that isolates the RF module's high-power RF signals from the HBC module and SAR sensor. This allows the RF module to operate at high power for extended transmission distance without generating harmful interference to other sensitive components in the integrated module.
Solution Approach 2:
By segmenting the circuit board into multiple layers with the RF module on the third layer separated from the HBC module (first layer) and SAR sensor (second layer), the patent creates spatial isolation that enables high-power RF operation without interfering with other modules.
Data Source
AI summary
A communication device includes an RF (Radio Frequency) module, an integrated module, a first tuning circuit, a signal transmission line, and a first antenna element. The RF module generates an RF signal. The integrated module includes a SAR (Specific Absorption Rate) sensor and an HBC (Human Body Communication) module. The signal transmission line includes a central conductor and an external conductor. The RF signal is transmitted through the signal transmission line to the first antenna element. The first terminal of the HBC module is coupled through the first tuning circuit to the central conductor, and the second terminal of the HBC module is coupled to the external conductor.