MIMO Antenna With Opposite-Surface Radiators for UWB Capacity
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Solution Overview
Problem
Current MIMO antennas for ultra-wideband (UWB) communication systems lack improved antenna arrangements to effectively increase system capacity and meet growing data traffic demands within the 3.1-10.6 GHz frequency band.
Innovation Solution
A MIMO antenna design featuring two antennas with radiating bodies, feeding portions, and metallic ground planes printed on opposite surfaces of a substrate, incorporating gaps between radiating portions to enhance bandwidth and isolation, while maintaining a low profile and small size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are used in MIMO systems to increase system capacity, then the system capacity and data traffic handling capability are improved, but the antenna arrangement complexity and space requirements increase
Solution Approach 1:
The patent utilizes the third dimension by placing radiating bodies on both the front surface and back surface of the substrate. This vertical stacking approach allows multiple antennas to coexist in a compact form factor, increasing system capacity without proportionally increasing the planar area occupied by the antenna array.
Solution Approach 2:
The patent embeds multiple antenna elements within a single substrate structure. The radiating bodies are nested between ground planes on opposite surfaces, creating a compact integrated assembly that reduces overall device complexity while maintaining multiple independent antenna channels for MIMO operation.
2Reliability
If antennas are spaced apart to decorrelate signals in MIMO systems, then signal independence and system performance are improved, but the physical size and area occupied by the antenna array increase
Solution Approach 1:
Instead of only increasing lateral spacing between antennas, the patent introduces vertical separation by placing radiating bodies on opposite surfaces of the substrate. This three-dimensional arrangement achieves signal decorrelation through both horizontal and vertical spacing, maintaining signal independence while minimizing the planar footprint of the antenna array.
3Volume of moving object
If a low profile and small size are maintained for the antenna, then device compactness and ease of integration are improved, but the bandwidth and isolation between antennas may be compromised
Solution Approach 1:
The patent nests the radiating bodies between ground planes on opposite surfaces, creating a compact sandwich structure. This nested arrangement provides electromagnetic shielding and isolation that enhances bandwidth performance and inter-antenna isolation while maintaining a small overall profile suitable for integration into compact wireless devices.
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 design achieves good performance across the 3.1-10.6 GHz frequency band with low VSWR and high isolation, suitable for UWB systems, thereby increasing system capacity and meeting future wireless communication demands.
Implementation Method 1
a radiating body for transmitting and receiving radio frequency (RF) signals
Implementation Method 2
a gap formed between the first radiating portion and the second radiating portion
Implementation Method 3
a metallic ground plane
Data Source
AI summary
A MIMO antenna (20) disposed on a substrate (10) including a first surface (102) and a second surface (104). The MIMO antenna includes a first antenna (20a) and a second antenna (20b) each including a radiating body (22a), a feeding portion (26a) electrically connected to the radiating body, and a metallic ground plane (24a). The radiating body includes a first radiating portion (222a), a second radiating portion (226a), and a gap (28a) formed between the first radiating portion and the second radiating portion. The radiating body and the feeding portion of the first antenna and the ground plane of the second antenna are laid on the first surface of the substrate, and the radiating body and the feeding portion of the second antenna and the ground plane of the first antenna are laid on the second surface of the substrate.