Antenna Device with Booster Conductor for RFID Space Efficiency
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Solution Overview
Problem
Existing communication terminal apparatuses and antenna devices for RFID systems face challenges in achieving high space efficiency due to the large size of radiation plates and metal surfaces required for optimal communication characteristics, leading to limited space for mounting other electronic components.
Innovation Solution
The proposed solution involves an antenna device with a coil conductor and a booster conductor that includes a coupling conductor portion with a slit, electromagnetically coupled to a frame-shaped radiation conductor portion, which increases the Q factor and enhances communication characteristics, allowing for high-density component mounting by utilizing the space created by the third opening for additional electronic apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid conductive sheet is used as a radiation plate to improve communication characteristics, then the Q factor increases, but the device occupies large space and reduces space efficiency for mounting other electronic components
Solution Approach 1:
The radiation plate is segmented into a frame-shaped structure with multiple openings instead of a solid conductive sheet. This segmentation maintains the essential electromagnetic radiation function while significantly reducing the occupied area, allowing other electronic components to be mounted within the openings and on the frame structure.
Solution Approach 2:
The radiation plate adopts a porous-like frame structure with multiple openings rather than a solid material. This approach maintains electromagnetic functionality while creating space for component mounting, effectively resolving the contradiction between communication performance and space efficiency.
2Reliability
If a metal surface with cut-out portions is used to improve communication characteristics, then the Q factor increases, but the metal surface and antenna conductor must be increased in size leading to increased overall antenna size
Solution Approach 1:
The antenna structure is segmented into distinct functional portions: a coil conductor, a booster conductor with coupling conductor portion, and a frame-shaped radiation conductor portion. This segmentation allows optimization of each portion's size and shape, achieving good communication characteristics without unnecessarily increasing overall antenna dimensions.
Solution Approach 2:
The invention utilizes multi-layer stacking in the vertical dimension, with the coil conductor, booster conductor, and radiation conductor portion arranged in different layers. This dimensional approach allows compact overall size while maintaining the necessary electromagnetic coupling and radiation characteristics.
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 significantly improves communication characteristics and enables high-space efficiency in portable terminal apparatuses, allowing for the integration of various electronic devices such as cameras, infrared communication apparatuses, and loud speakers without compromising performance.
Implementation Method 1
an RFID system, predetermined information is transmitted between a reader/writer that generates an induction field and an RFID tag attached to an article, through non-contact communication based on an electromagnetic field
Implementation Method 2
a booster conductor including a coupling conductor portion that includes a second opening that is at least partially overlapped by the first opening, is split in a portion thereof by a slit, and is electromagnetically coupled to the coil conductor
Data Source
AI summary
An antenna device which includes a coil conductor and a booster conductor. The coil conductor is defined by wound loop-shaped conductors and includes a first opening at a winding center and two ends connected to a feeding circuit. The booster conductor includes a coupling conductor portion and a frame-shaped radiation conductor portion. The coupling conductor portion includes a second opening overlapped at least partially by the first opening, is split in a portion thereof by a slit, and is electromagnetically coupled to the coil conductor. The frame-shaped radiation conductor portion includes a third opening and is connected to the coupling conductor portion.