MIMO Antenna Device with Buffering Sheet for Size Reduction
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Solution Overview
Problem
Conventional antenna arrays are too large due to the need for multiple patch antennas to achieve higher gains, limiting their application scope.
Innovation Solution
A multi-input multi-output (MIMO) antenna device with a buffering sheet and high-frequency antennas arranged in a specific configuration, using jumpers and feeding segments to share high-frequency signals and reduce size, while maintaining signal isolation through non-overlapping resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple conventional patch antennas are combined to form an antenna array to achieve larger gain, then the gain requirement is met, but the size of the antenna array becomes too large
Solution Approach 1:
The patent merges multiple antenna functions into a single integrated structure. The buffering sheet serves dual purposes as both a low-frequency antenna and a high-frequency reflector, while high-frequency antennas are positioned to utilize the buffering sheet's reflective properties. This consolidation eliminates the need for separate conventional patch antennas, achieving high gain through constructive interference and signal reflection rather than through physical array expansion.
Solution Approach 2:
The patent introduces vertical dimension utilization by positioning high-frequency antennas at specific heights above the buffering sheet. The buffering sheet acts as a reflective ground plane, creating image currents that enhance the radiation pattern. This three-dimensional antenna configuration achieves higher gain without increasing the horizontal footprint, effectively solving the size-gain tradeoff.
2Area of stationary object
If the buffering sheet and high-frequency antennas share the same structure, then size is reduced, but signal isolation between high-frequency signals may deteriorate
Solution Approach 1:
The patent applies local quality by making the buffering sheet's dimensions specific to its resonant frequency characteristics. The buffering sheet's length and width are carefully designed to create a resonance frequency that does not overlap with the high-frequency operating band. This localized frequency separation ensures that the buffering sheet reflects high-frequency signals effectively while maintaining its own resonant mode isolation, thereby preserving signal isolation between adjacent high-frequency antennas.
Solution Approach 2:
The patent changes the resonance frequency parameter of the buffering sheet by adjusting its physical dimensions. By designing the buffering sheet with specific length and width values that create a resonance frequency distinct from the high-frequency operating band, the patent ensures that the buffering sheet does not resonate at high frequencies. This parameter optimization allows the buffering sheet to function as an effective reflector while maintaining signal isolation between high-frequency antenna elements.
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 MIMO antenna device effectively reduces size and improves signal isolation between high-frequency signals, achieving gains comparable to larger conventional arrays with improved spatial efficiency.
Implementation Method 1
the first high-frequency antennas and the buffering sheet are shared to transmit the two high-frequency signals
Implementation Method 2
the length of the side of the buffering sheet is different from the length of the side of each of the first high-frequency antennas, so the resonance frequency of the buffering sheet does not overlap the high-frequency band
Data Source
AI summary
A MIMO antenna device includes an antenna array, a grounding member, and several supporting pillars hanging the antenna array over the grounding member. The antenna array defining a first and a second longitudinal direction perpendicular to each other includes a square buffering sheet arranged at a center thereof, four square low-frequency antennas respectively arranged at four corners thereof, two square high-frequency antennas arranged at two opposite sides of the buffering sheet in the first longitudinal direction, and a first and a second feeding segment respectively connecting the two diagonal low-frequency antennas to the adjacent two high-frequency antennas. The antenna array can be provided to approximately construct into an inverted S-shaped circuit. Each side of the buffering sheet is different from an edge of each high-frequency antenna, and the edge of each high-frequency antenna is shorter than a side of each low-frequency antenna.