Gapless Shield Cover for GPS Antenna LNA Protection
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Solution Overview
Problem
Conventional shield covers for GPS antennas have gaps between side wall and corner portions, leading to solder flow and potential shorts in the LNA circuit during mounting.
Innovation Solution
A shield cover design with chamfered corners and no gaps between side wall and corner portions, formed by bending or drawing a metal plate, ensuring secure soldering without solder flow and preventing shorts in the LNA circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shield cover has folded portions between side wall portions and corner portions, then the shield cover can be formed by simple bending of a metal plate, but gaps are created at the folded portions allowing solder to flow inside and cause shorts
Solution Approach 1:
The shield cover is divided into a ceiling portion and a wall portion that are joined together. This segmentation allows the ceiling portion to be formed separately without folds, eliminating gaps while maintaining ease of manufacture through modular construction
Solution Approach 2:
The ceiling portion and wall portion are merged into a single integrated component. This combining ensures that the ceiling portion extends continuously to the corners without gaps, preventing solder flow while maintaining structural integrity
2Strength
If the shield cover is soldered at the four corners, then the shield cover can be securely mounted on the circuit board, but solder flows through gaps at folded portions and causes shorts in the LNA circuit
Solution Approach 1:
The folded portions that create gaps are extracted from the ceiling portion design. By making the ceiling portion gapless and extending it directly to the corners, the source of the harmful solder flow path is removed while maintaining secure soldering at the corners
Solution Approach 2:
The gapless ceiling portion acts as an intermediary barrier between the solder applied at the corners and the LNA circuit inside. This continuous metal structure prevents solder from reaching the circuit while allowing secure mounting
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
Prevents solder flow and shorts in the LNA circuit, ensuring reliable operation of the GPS antenna unit by eliminating gaps between side wall and corner portions during soldering.
Implementation Method 1
a shield cover (24) mounted on the back surface (21b) of the circuit board (21), for shielding the signal processing circuit (23)
Implementation Method 2
The shield cover (24) is mounted on the back surface (21b) of the circuit board (21) by soldering at the four corner portions (247)
Data Source
AI summary
Mounted on a back surface (21b) of a circuit board (21), a shield cover (24) has a substantially rectangular ceiling portion (241) with four corners which are chamfered, four side wall portions (242-245), and four corner portions (457). The shield cover (24) is mounted on the back surface (21b) of the circuit board by soldering at the four corner portions (247). There is no gap between the four side wall portions (242-245) and the four corner portions (247). The shield cover (24) is formed by bending working of a metal plate (40) and has extension portions (248) at both ends of the four corner portions (247) so as to interpose with the side wall portions (242-245).