Chip Antenna Grooved Core for Reliable Board Bonding
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Solution Overview
Problem
Existing chip antennas face challenges in achieving a reliable and strong connection bond between the antenna and the board, which affects their performance and reliability in applications such as RFID, NFC, and wireless power transfer.
Innovation Solution
A solenoid-type chip antenna design featuring a core with chamfered edges and grooves on the supporting portions to accommodate the coil, allowing for improved winding and bonding of the coil to the board, along with the use of conductive pads and protective resin for enhanced electrical and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil is wound around the core without grooves, then the winding process is simpler, but the connection bond between the chip antenna and the board is weak
Solution Approach 1:
The core is segmented into a body portion and supporting portions, with grooves created on the supporting portions to receive and secure the coil ends. This segmentation allows the coil to be firmly anchored to the board through the grooves, significantly improving the connection bond while maintaining a relatively simple overall structure.
Solution Approach 2:
The grooves are pre-formed on the supporting portions of the core before the coil winding process. This preliminary action ensures that the coil ends have predetermined pathways to follow, making the subsequent winding and bonding processes easier and more reliable, rather than requiring complex post-processing to achieve proper coil positioning.
2Volume of moving object
If the coil winding radius is reduced, then the antenna size is smaller, but the coil is more prone to bending and damage
Solution Approach 1:
The grooves on the supporting portions act as cushioning structures that protect the coil ends from bending and damage. By providing these protective grooves in advance, the coil is secured in a way that prevents excessive stress concentration, allowing the antenna to maintain a compact size without compromising coil integrity.
Solution Approach 2:
The grooves are specifically located on the supporting portions where the coil ends are most vulnerable to damage. This local quality enhancement provides targeted protection and structural support exactly where needed, enabling reduced winding radius without proportionally increasing the risk of coil damage throughout the entire structure.
Data Source
AI summary
A chip antenna includes a coil; and a core including a body portion around which the coil is wound and supporting portions disposed on both sides of the body portion, wherein the core includes a second groove formed in the supporting portions and accommodating an end portion of the coil.