Memory Card Chip Antenna Layout for Radio Signal Integrity
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Solution Overview
Problem
Low-cost cellular phones and smart phones with minimal functions often lack proximity wireless communication capabilities, but when a memory card with proximity wireless communication functionality is inserted, the radio field intensity can be compromised due to circuit components blocking the magnetic flux from the chip antenna, depending on the device's orientation.
Innovation Solution
The memory card design features a chip antenna mounted on a substrate with minimal conductive components on specific areas to prevent magnetic flux blockage, ensuring stable proximity wireless communication by positioning the antenna far from connectors and circuit components, allowing for optimal signal transmission and radio quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circuit components and circuit patterns are formed on the substrate, then the memory card can provide necessary electronic functions, but the magnetic flux from the chip antenna is blocked and radio field intensity deteriorates
Solution Approach 1:
The substrate is divided into multiple areas with different functions: a first area for mounting the chip antenna with minimal conductive components to ensure radio quality, and a second area for mounting other circuit components. This segmentation allows the antenna area to avoid magnetic flux blockage while other areas provide necessary electronic functions.
Solution Approach 2:
Different areas of the substrate are designed with different qualities: the first area has minimal conductive components and patterns to optimize magnetic flux transmission for the chip antenna, while the second area contains the necessary circuit components for memory card functionality. This local differentiation resolves the contradiction between functionality and radio field intensity.
2Ease of operation
If the cellular phone or smart phone is held in different orientations, then user convenience is improved, but the radio field intensity varies due to orientation-dependent blockage of magnetic flux
Solution Approach 1:
The chip antenna is extracted and mounted on the first area of the substrate that is specifically designed to minimize interference from conductive components. By separating the antenna from other circuit components and placing it in a dedicated area with minimal conductive elements, the antenna's performance becomes less sensitive to device orientation, allowing users to hold the device in various orientations without significant variation in radio field intensity.
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 stable proximity wireless communication across various orientations, maintaining radio quality similar to devices without orientation-dependent blockages, ensuring consistent communication performance.
Implementation Method 1
a chip antenna needs to be mounted on a substrate in the memory card
Implementation Method 2
circuit components and circuit patterns are formed on the substrate, which blocks a magnetic flux from the coil in the chip antenna
Data Source
AI summary
A memory card provided with a communication function has a substrate having a first mounting surface and a second mounting surface on a side opposite to the first mounting surface, a memory chip mounted on the first mounting surface or the second mounting surface, a proximity wireless communication circuit on the first mounting surface or the second mounting surface, a circuit pattern which is disposed on at least one of a first area of the first mounting surface and a second area of the second mounting surface located opposite to the first area, the substrate being between the first area and the second area, and which is connected with the memory chip and the proximity wireless communication circuit, and a chip antenna mounted on a third area of the first mounting surface or a fourth area of the second mounting surface.