Antenna Shielding Structure for Wireless Device Isolation
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Solution Overview
Problem
Designing small-sized wireless communication devices that incorporate multiple antennas for different frequency bands poses a challenge in balancing antenna isolation and performance, as existing solutions struggle to effectively shield interference signals between multiple antennas.
Innovation Solution
The electronic device employs a shielding structure between its three antennas, including a carrier with strategically positioned antennas and a shielding structure that includes metal shielding boxes and circuit boards, to isolate interference signals and enhance antenna efficiency, allowing for good isolation and efficiency across LTE, GPS, and Bluetooth frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are placed in a small-sized device, then the device can support multiple frequency bands, but antenna isolation and performance deteriorate due to interference signals
Solution Approach 1:
The device divides the antenna system into three separate antennas (first antenna for first frequency band, second antenna for second frequency band, third antenna for third frequency band) positioned at different locations on the carrier, with each antenna independently handled and isolated from the others through spatial separation and shielding structures
Solution Approach 2:
A shielding structure is introduced as an intermediary element between the first antenna and the second/third antennas. This shielding structure includes a cell, first metal shielding box, circuit board, and second metal shielding box stacked sequentially, acting as a barrier to block interference signals while allowing the device to maintain compact dimensions
2Volume of moving object
If the device size is reduced, then portability improves, but the ability to isolate multiple antennas deteriorates
Solution Approach 1:
The shielding structure utilizes the thickness dimension of the device by stacking components (cell, metal shielding boxes, circuit board) sequentially in the thickness direction. This vertical stacking approach allows effective shielding without increasing the device's length or width, maintaining compact form factor while achieving proper antenna isolation
Solution Approach 2:
The shielding structure employs a nested configuration where the second metal shielding box is positioned within or adjacent to the first metal shielding box, and both are integrated with the circuit board and cell in a stacked arrangement. This nested design maximizes shielding effectiveness within the limited space of the compact device
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 achieves effective shielding of interference signals between antennas, resulting in improved isolation and efficiency for all three frequency bands, ensuring optimal performance in a compact device.
Implementation Method 1
The shielding structure is disposed between the first antenna and the second antenna, and between the first antenna and the third antenna, so that the shielding structure shields interference signals between the first antenna and the second antenna, and interference signals between the first antenna and the third antenna
Data Source
AI summary
The disclosure provides an electronic device including a carrier, a first antenna, a second antenna, a third antenna, and a shielding structure. The carrier includes a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other. The first antenna is disposed at the first side of the carrier. The second antenna and the third antenna are disposed at the second side of the carrier. The first, second, and third antennas are used for transmitting and receiving wireless signals at first, second, and third frequency bands, respectively. The shielding structure is disposed between the first antenna and the second antenna, and between the first antenna and the third antenna, so that the shielding structure shields interference signals between the first antenna and the second antenna, and interference signals between the first antenna and the third antenna.