EBG Shielded Antenna Device for mmWave Signal Integrity
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Solution Overview
Problem
The quality of communication signals in electronic devices can be deteriorated by Electromagnetic Interference (EMI) or Radio Frequency Interference (RFI), particularly in mmWave communication systems, where shields can interfere with signal transmission and reception due to their size affecting the resonance frequency.
Innovation Solution
Incorporating an Electromagnetic Band Gap (EBG) structure into the conductive shield of electronic devices, which is electrically connected to the radio frequency integrated chip and printed circuit board, prevents signal loss by blocking electromagnetic interference and enhancing antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield can is used to reduce EMI and RFI, then shielding effectiveness is improved, but signal loss in mmWave band increases due to resonance frequency interference
Solution Approach 1:
The patent applies Electromagnetic Band Gap (EBG) structure to the shield can, which fundamentally changes the electromagnetic parameters of the shield. The EBG structure creates frequency-selective properties that allow the shield to block EMI and RFI while maintaining signal integrity in the mmWave band by preventing resonance frequency interference through its periodic electromagnetic response characteristics
Solution Approach 2:
The shield can is transformed from a simple conductive material into a composite structure by integrating the EBG pattern design. This composite approach combines the shielding properties of conductive materials with the frequency-selective properties of the EBG geometric pattern, achieving both EMI/RFI reduction and signal loss prevention simultaneously
2Object-affected harmful factors
If a shield can is used to protect against electromagnetic interference, then shielding effectiveness is improved, but transmission power and reception performance decrease
Solution Approach 1:
The EBG structure modifies the electromagnetic parameters of the shield can to create frequency-selective behavior. This allows the shield to differentiate between harmful EMI/RFI signals and useful mmWave communication signals, blocking the former while maintaining the latter, thus preserving transmission power and reception performance while providing electromagnetic protection
3Reliability
If a shield can with EBG structure is used, then antenna performance is improved, but device complexity increases
Solution Approach 1:
The EBG structure is implemented by dividing the shield can surface into periodic unit cells or patterns. This segmentation approach creates the desired electromagnetic band gap properties while maintaining a modular design that can be manufactured using standard techniques, balancing performance improvement with manageable complexity
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 EBG structure effectively reduces signal loss and improves antenna performance across the mmWave band, maintaining transmission and reception power, and increasing shielding effectiveness in the 20 GHz to 30 GHz frequency range.
Implementation Method 1
a conductive shield structure covering the radio frequency integrated chip, mounted on the first surface, and electrically connected with the conductive layer, when seen from above the first surface, in which the conductive shield structure may have a third surface facing the first surface and an Electromagnetic Band Gap (EBG) structure disposed on the third surface
Data Source
AI summary
An antenna device comprises: a printed circuit board formed with both sides in a plate shape including a first surface and a second surface and including at least one conductive layer between the first surface and the second surface; an array of conductive plates formed parallel to the first surface on or in the printed circuit board; a wireless communication circuit electrically connected to the array of conductive plates, coupled to the first surface, and capable of transmitting or receiving frequencies between 3 GHz and 300 GHz; and a conductive shielding structure mounted on the first surface of the printed circuit board and electrically connected to the at least one conductive layer when covering the wireless communication circuit, wherein the conductive shielding structure may include: a third surface facing the first surface when seen from the top of the first surface; and an electromagnetic bandgap (EBG) structure formed on the third surface.