Antenna Assembly Using Metal-Dielectric Structures for Compact Wireless Devices
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Solution Overview
Problem
The design of compact antennas for portable communication devices is hindered by limited space and electromagnetic interference, making it challenging to achieve optimal performance and bandwidth in Multiple Input, Multiple Output (MIMO) systems.
Innovation Solution
The use of a printed circuit board with strategically placed metal-dielectric structures around the antenna, which alter the effective electrical size, allowing the antenna to be physically smaller than its resonant length while maintaining efficient operation at specific radio frequencies, utilizing microelectromechanical systems for dynamic tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna physical size is reduced to fit limited device space, then the antenna can be accommodated in compact mobile devices, but the antenna cannot resonate efficiently at the required radio frequency
Solution Approach 1:
The patent employs metal-dielectric composite structures (electromagnetic bandgap structures) integrated with the antenna. These composite structures modify the electromagnetic properties of the antenna system, enabling compact size while maintaining resonant efficiency. The metal elements provide conductive paths while dielectric materials provide insulation and electromagnetic field control, together achieving the desired resonance in a reduced volume.
Solution Approach 2:
The patent changes the electromagnetic parameters of the antenna system by introducing electromagnetic bandgap structures with specific geometric configurations. These structures alter the effective electrical length and resonant frequency of the antenna without proportionally increasing its physical dimensions, thereby achieving size reduction while maintaining resonance efficiency through parameter optimization.
2Productivity
If multiple antennas are placed close together in limited device space, then MIMO system capacity is enabled, but electromagnetic interference between antennas degrades performance
Solution Approach 1:
The patent introduces electromagnetic bandgap structures as intermediary elements positioned between multiple antennas. These structures act as electromagnetic shields or isolators that prevent harmful electromagnetic coupling between adjacent antennas while allowing the antennas to operate at their required frequencies. This mediator approach enables close spacing of multiple antennas for MIMO functionality without suffering from interference degradation.
3Reliability
If the antenna resonant length is maintained for efficient operation, then signal transmission efficiency is ensured, but the antenna occupies excessive device space
Solution Approach 1:
The patent transitions from traditional planar antenna designs to three-dimensional electromagnetic bandgap structures. By utilizing vertical dimension and creating multi-layer metal-dielectric configurations, the antenna achieves the required electrical length for efficient resonance while occupying reduced planar area on the device surface. This dimensional transformation allows maintaining signal transmission efficiency without excessive space occupation.
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
Enables antennas to be physically smaller than their resonant length, maintaining efficient signal transmission and reception, and allowing for tuning across different frequencies, thereby enhancing system capacity and reducing electromagnetic interference.
Implementation Method 1
The size of the antenna is dictated by the radio frequency or band of frequencies at which the antenna is intended to resonate and operate. Typically, the physical length of the antenna is a fraction of the wavelength of the operating frequency, for example one-fourth or one-half the wavelength of the radio frequency signal, thus enabling the antenna to resonate at the respective operating frequency.
Implementation Method 2
One technique for improving the capacity is to provide uncorrelated propagation paths using Multiple Input, Multiple Output (MIMO) systems. A MIMO system employs a number of separate independent signal paths, for example by means of several transmitting and receiving antennas.
Implementation Method 3
utilizing microelectromechanical systems for dynamic tuning
Data Source
AI summary
An antenna assembly for a wireless communication device includes a substrate of dielectric material that has opposing first and second surfaces. A ground plane formed by a layer of electrically conductive material on the first surface. An antenna with a physical length is disposed on the substrate. At least one metal-dielectric structure is disposed on the substrate. The metal-dielectric structures resonate so as to interact with the antenna and thereby alter the effective electrical length of the antenna. That interaction causes the antenna to function as though it had a greater physical length. In one embodiment, that interaction enables an antenna, that is shorter than one-fourth the wavelength of a radio frequency signal applied thereto, to function as through the physical length of the antenna was one-fourth that wavelength.