Dipole Antenna Module Cable Ground Structure Noise Reduction
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Solution Overview
Problem
Conventional portable electronic devices face reduced wireless performance due to noise interference from internal components and antennas, and existing dipole antennas are limited to single-band operation with unbalanced circuits, leading to non-uniform radiation patterns.
Innovation Solution
A dipole antenna module with a cable ground structure, featuring an antenna element with dual asymmetrical dipole patterns for multi-band operation, a power feeder connected to a circuit board via a cable, and a ground part that forms a capacitance with the antenna element to adjust radiation patterns and bandwidth, reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a planar type dipole antenna with chip type balanced circuit is used, then noise interference is reduced, but the antenna is limited to single-band operation and the circuit becomes unbalanced
Solution Approach 1:
The antenna element is divided into multiple dipole patterns (first dipole pattern for first band, second dipole pattern for second band) that are electrically connected in series. This segmentation allows each dipole pattern to operate at different frequency bands while maintaining the overall balanced circuit structure, resolving the contradiction between noise reduction and multi-band capability.
Solution Approach 2:
The dipole antenna module is designed to perform multiple functions by incorporating both first and second dipole patterns that can operate at different frequency bands (e.g., 2 GHz band and 5 GHz band). The cable ground structure provides universal grounding for both bands, enabling the antenna to function across multiple bands while maintaining balanced operation and reducing noise interference.
2Object-affected harmful factors
If the chip type balanced circuit is installed within the portable electronic apparatus, then noise is reduced, but the circuit is converted into an unbalanced circuit resulting in non-uniform dipole patterns
Solution Approach 1:
The cable ground structure acts as an intermediary grounding mechanism that maintains circuit balance. By providing a dedicated ground path through the cable ground part that is spaced from the antenna element, the balanced signal integrity is preserved throughout the circuit, preventing conversion to unbalanced operation and ensuring uniform dipole patterns are emitted.
Solution Approach 2:
The ground part is extracted and separated from the antenna element by a preset gap, creating a cable ground structure that is electrically connected to the circuit board ground but physically separated from the antenna. This extraction maintains the balanced circuit configuration by providing independent grounding without interfering with the antenna's electromagnetic field distribution, thus preserving circuit balance and uniform radiation patterns.
3Volume of moving object
If space within electronic apparatus is reduced to improve portability, then device size is decreased, but noise increases due to interference between components and antennas
Solution Approach 1:
The ground part is positioned in the vertical dimension (spaced from the antenna element in the thickness direction) rather than occupying horizontal space. This dimensional arrangement allows the grounding function to be implemented without increasing the planar footprint of the antenna module, enabling compact device design while maintaining noise reduction through proper grounding.
Solution Approach 2:
The cable ground structure utilizes thin film or sheet materials (such as aluminum sheet or copper sheet with thickness of 0.3 mm) to provide effective grounding in a minimal space. This thin film approach allows the ground part to be integrated into the compact antenna module without significantly increasing overall device volume, thus reducing noise interference while maintaining portability.
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
The solution enhances wireless performance by reducing noise interference and achieving balanced circuit operation, allowing for omnidirectional signal transmission and reception across multiple frequency bands, while reducing component count and costs.
Implementation Method 1
The ground part may adjust a radiation pattern and a radiation bandwidth of the antenna element by using a capacitance formed between the ground part and the antenna element.
Data Source
AI summary
A dipole antenna module and an electronic apparatus include an antenna element, a power feeder formed at an end of the antenna element and connected to a circuit board to process an antenna signal through a cable, and a ground part to ground a ground of the cable such that the ground part keeps a preset gap from the antenna element and is grounded to a conductor of the circuit board.