Multi-Band Antenna Layout With Segmented Grounding for High Isolation
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Solution Overview
Problem
The challenge lies in designing an antenna system that integrates multiple communication modes (5G, WiFi, and GPS) while maintaining a small form factor and high isolation between antennas, which is essential for MIMO systems, without increasing manufacturing costs or reducing performance.
Innovation Solution
An antenna device with a circuit board integrating multiple antennas on a dielectric substrate, utilizing grounding units and microstrip lines to maintain isolation and support various frequency bands, including LTE/5G, WiFi, and 5G, while minimizing dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna dimensions are increased to improve isolation degree between primary and auxiliary antennas, then isolation degree is improved, but device size becomes larger
Solution Approach 1:
The grounding structure is segmented into multiple independent grounding units (first grounding unit, second grounding unit, third grounding unit) positioned at different locations on the circuit board. Each grounding unit serves specific antenna pairs, creating isolated grounding zones that improve mutual isolation between antennas while maintaining compact overall dimensions
Solution Approach 2:
Grounding units are introduced as intermediary elements between primary and auxiliary antennas. These grounding structures act as electromagnetic shields and reference potential planes, mediating the electromagnetic fields to enhance isolation between antenna elements without requiring increased spacing between antennas
2Area of stationary object
If multiple antennas are integrated on a single circuit board to reduce device size, then device size is reduced, but isolation degree between antennas deteriorates
Solution Approach 1:
The circuit board is segmented into multiple functional zones with dedicated grounding units for different antenna systems (LTE/5G, WiFi, etc.). This segmentation allows compact integration of multiple antennas while maintaining electromagnetic isolation through spatially distributed grounding structures
Solution Approach 2:
Different grounding units are designed with locally optimized characteristics suitable for their specific antenna pairs and frequency ranges. Each grounding unit's geometry and position are tailored to provide optimal isolation for its associated antennas, enabling high isolation performance across multiple frequency bands in a compact form factor
3Adaptability or versatility
If antenna dimensions are increased to support wide bandwidth for 2G, 3G and Sub 6G frequency bands, then bandwidth compatibility is improved, but device size becomes larger
Solution Approach 1:
The antenna system is designed with multi-functional capability to operate across 2G, 3G, and Sub 6G frequency bands simultaneously. Multiple antenna elements with different grounding units enable the system to handle diverse frequency requirements without requiring separate antenna systems, achieving wide bandwidth compatibility in a compact integrated structure
Data Source
AI summary
An antenna device includes: a dielectric substrate; a first grounding face, a second grounding face and a third grounding face which are provided on a first face of the dielectric substrate and are isolated from each other; a first primary antenna and a first auxiliary antenna which are provided on the first face, cooperatively act with the first grounding face to operate at a first frequency range and are isolated from each other; a second primary antenna and a second auxiliary antenna which cooperatively act with the first grounding face to operate at a second frequency range and are isolated from each other; a third primary antenna which cooperatively acts with the second grounding face to operate at a third frequency range; and a third auxiliary antenna which cooperatively acts with the third grounding face to operate at the third frequency range.