Antenna Package Circuit Board Layout for Bending Reliability
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Solution Overview
Problem
Existing antenna designs in image display devices face issues with mechanical and electrical reliability due to bending stress, which can lead to circuit wiring damage and connection failures, especially as devices become thinner and require high-frequency communication.
Innovation Solution
An antenna package with a circuit board featuring variable widths, including an antenna connection portion with a larger width for stable bonding and a circuit extension portion with a smaller width for improved flexibility, along with features like openings, slits, and a ground layer to enhance mechanical stability and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circuit board is made thinner to reduce device thickness, then the device thickness is reduced, but the bending stress increases causing circuit wiring damage and connection failure
Solution Approach 1:
The circuit board is designed with variable thickness: a first circuit board portion with greater thickness at the bending region to withstand stress, and a second circuit board portion with lesser thickness in the antenna connection region to maintain flexibility and reduce overall device thickness. This local quality differentiation resolves the contradiction between thinness and reliability.
Solution Approach 2:
The circuit board is segmented into multiple portions with different thickness characteristics. The first portion (bending region) and second portion (antenna connection region) are structurally differentiated to handle different mechanical requirements, allowing the board to be thin overall while maintaining reliability at critical locations.
2Ease of operation
If the circuit board is bent to connect the antenna to the driving IC chip, then the connection is achieved, but bending stress damages the circuit wirings and causes connection failure
Solution Approach 1:
The first circuit board portion at the bending region is designed with greater thickness to provide enhanced strength and stress resistance, protecting the circuit wirings from damage during bending operations while still allowing the necessary flexibility for connection.
Solution Approach 2:
The increased thickness at the bending region acts as a preventive measure, cushioning the circuit wirings from bending stress before damage can occur. This structural reinforcement is built in advance to prevent connection failure.
3Reliability
If the antenna package is designed for high-frequency communication, then the communication performance is improved, but the circuit board requires greater stability against bending stress
Solution Approach 1:
The circuit board's variable thickness design provides localized reinforcement at the bending region (first portion) while maintaining overall thinness. This ensures the structural stability needed for high-frequency communication without sacrificing the thin profile required for modern devices.
Data Source
AI summary
An antenna package according to an embodiment includes an antenna unit and a circuit board bonded to the antenna unit. The circuit board includes a core layer comprising a plurality of portions having different widths from each other in a planar view, the core layer having a first surface and a second surface opposing each other, and a circuit wiring disposed on the first surface of the core layer and electrically connected to the antenna unit.