RF Antenna on Smart Card Substrate for Conductive Housing
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Solution Overview
Problem
Designing an efficient RF antenna structure for consumer appliances with electrically conductive housings is challenging due to packaging and electromagnetic performance issues, especially in compact applications where space is limited.
Innovation Solution
A smart card substrate is used as a dielectric carrier for an RF antenna, with a separate RF transceiver module and transmission line, allowing the antenna to be physically and electrically isolated from the card circuit module, and extending from an electrically conductive chassis to support wireless data communication functions without affecting the native functionality of the smart card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an RF antenna structure is integrated into a device with an electrically conductive housing, then wireless communication functionality is achieved, but electromagnetic interference and packaging issues arise
Solution Approach 1:
The patent divides the antenna system into separate functional components: the smart card substrate carries the antenna element while being electrically isolated from the conductive housing, and the RF transceiver is positioned separately. This segmentation allows the antenna to function independently without electromagnetic interference from the conductive chassis, resolving the contradiction between achieving wireless functionality and avoiding electromagnetic interference.
Solution Approach 2:
The smart card substrate acts as an intermediary carrier that supports the RF antenna element while providing electrical isolation from the conductive housing. The substrate serves as a mediator between the antenna and the conductive environment, enabling the antenna to operate without direct electrical contact with the interfering conductive surfaces, thus eliminating electromagnetic interference while maintaining wireless communication capability.
2Volume of moving object
If space for antenna placement is limited in compact applications, then device size is reduced, but antenna deployment and positioning become difficult
Solution Approach 1:
The patent merges the antenna support function with the smart card substrate, which is already present in the device for other purposes. By integrating the antenna element onto the existing smart card substrate rather than requiring separate antenna mounting space, the design achieves compact dimensions while maintaining ease of antenna deployment through the pre-positioned substrate infrastructure.
3Device complexity
If the RF antenna is integrated with the smart card circuit module, then device complexity is reduced, but the native functionality of the card circuit module may be affected
Solution Approach 1:
The patent extracts the RF antenna element from the smart card circuit module, placing it on the substrate while maintaining electrical isolation. This extraction ensures that the antenna operations do not interfere with the native smart card circuit functionality, preserving reliability while still achieving a compact integrated appearance. The physical proximity without electrical connection resolves the contradiction between reduced complexity and maintained functionality.
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
This configuration enables a compact, efficient, and effective RF antenna structure that supports wireless data communication in consumer devices like video services receivers, reducing electromagnetic interference and maintaining the integrity of the smart card's native functions.
Implementation Method 1
The smart card includes a dielectric substrate forming a card body, and an RF antenna arrangement carried by the dielectric substrate
Data Source
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AI summary
A smart card apparatus and related systems are presented here. The smart card apparatus includes a dielectric substrate forming a card body, a card circuit module carried by the dielectric substrate, and a radio frequency (RF) antenna arrangement carried by the dielectric substrate. The RF antenna arrangement is physically and electrically isolated from the card circuit module, and RF signals communicated by the RF antenna arrangement are unrelated to native functionality of the card circuit module.