Antenna Module Ground Expansion for Small Device Gain
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Solution Overview
Problem
Small electronic devices such as smart watches and smart bands face poor antenna performance due to their limited circuit board size, which restricts antenna gain.
Innovation Solution
An antenna module is enhanced by incorporating a ground expansion member, such as a metal plate or metal wire, connected to the antenna's ground line, along with a flexible printed circuit board, to increase the ground area and improve antenna gain within the constrained space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circuit board size is reduced for small electronic devices, then the device size is reduced, but the antenna performance deteriorates due to insufficient ground area
Solution Approach 1:
The ground expansion member extends the ground area from the two-dimensional circuit board plane into the third dimension by utilizing the internal space of the housing. The ground expansion member is positioned between the circuit board and the housing inner wall, effectively adding vertical dimension to the ground area, thereby resolving the contradiction between small device size and sufficient ground area for antenna performance
Solution Approach 2:
The ground expansion member is nested within the housing space, utilizing the available internal volume. The member is positioned and fixed within the housing to expand the ground area without increasing the external dimensions of the device, effectively nesting the ground expansion function within the existing device structure
2Reliability
If the ground area is expanded using a metal plate or wire, then the antenna gain is improved, but the device complexity increases
Solution Approach 1:
The ground expansion member can be implemented as a thin metal plate or wire structure that is flexible enough to be positioned and fixed within the housing. This thin-film approach expands the ground area without adding significant bulk or structural complexity to the device
Solution Approach 2:
The ground expansion member is designed to be self-fixing within the housing through positioning protrusions that engage with corresponding recesses in the housing inner wall. This self-fixing mechanism eliminates the need for additional fastening components, thereby reducing device complexity while still achieving ground area expansion
Data Source
AI summary
Proposed is an antenna module for a small device, wherein the antenna module is expanded to a ground area through a metal plate, a metal wire, or a connector FPCB and the like to improve antenna gain. The proposed antenna module for a small device is provided with an antenna, and comprises: a circuit board mounted inside a housing of a small device; and a ground expansion member which is mounted inside the housing, comprises one of the metal plate, the metal wire, or the connector FPCB, and has a first end connected to a ground line of the antenna.