Dual-Ground Antenna Module for GPS-LTE Isolation
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Solution Overview
Problem
The proximity of GPS and LTE antennas in bicycle trackers results in poor isolation and interference, leading to poor antenna reception due to their close placement.
Innovation Solution
The design of separate first and second ground planes for each antenna, with the second antenna having a larger ground plane and a conductor spacer to enhance isolation, along with a third ground plane connected via holes, ensuring each antenna has its own dedicated ground plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If GPS and LTE antennas are disposed close together to achieve a compact tracker design, then the device size is reduced, but the isolation between antennas deteriorates causing interference
Solution Approach 1:
The invention divides the ground plane into separate first and second ground planes, each dedicated to one antenna type. The first ground plane is associated with the GPS antenna and the second ground plane is associated with the LTE antenna, physically segmenting the grounding system to reduce interference while maintaining compact dimensions
Solution Approach 2:
The conductor spacer acts as an intermediary element positioned between the two antennas. It provides electromagnetic shielding and isolation between the GPS and LTE antennas, reducing harmful interactions while allowing the antennas to be disposed close together for compact design
2Weight of moving object
If GPS and LTE antennas are disposed close together to achieve a light and thin appearance, then the device weight and thickness are reduced, but the isolation between antennas deteriorates
Solution Approach 1:
The ground plane is segmented into separate first and second ground planes with different areas, each optimized for its associated antenna. This segmentation allows compact antenna placement without requiring large isolated ground areas, reducing overall device weight and thickness while maintaining isolation
Solution Approach 2:
The invention utilizes the vertical dimension by stacking the first and second ground planes at different heights. The conductor spacer extends vertically between the antennas, providing isolation in the vertical dimension while allowing horizontal compactness for reduced weight and thickness
3Object-affected harmful factors
If separate ground planes are provided for each antenna to improve isolation, then antenna interference is reduced, but the device complexity increases
Solution Approach 1:
The first and second ground planes are merged into a single substrate layer, and the conductor spacer is integrated into the same substrate. This merging approach reduces the number of separate components and simplifies manufacturing while still providing the isolation benefits of separate ground planes
Solution Approach 2:
The substrate serves multiple functions: it provides mechanical support for the antennas, acts as the medium for the ground planes, and serves as the structural basis for the conductor spacer. This multi-functionality reduces the need for additional components, simplifying the overall device structure
Data Source
AI summary
An antenna module includes a first antenna, a second antenna, a first ground plane, and a second ground plane. The first antenna is used to excite at a first frequency band. The second antenna is disposed beside the first antenna and includes a first radiator with a feeding end, a second radiator connected to the first radiator, and a third radiator connected to the first radiator and including a ground end. The first radiator excites at a second frequency band, and a part of the first radiator and the second radiator excite at a third frequency band. The first ground plane is located below the first antenna and spaced apart from the first antenna. The second ground plane is located below the second antenna and spaced apart from the first ground plane. The ground end is connected to the second ground plane.