Compact Dual-Polarization Antenna With Dielectric Layer And Air Cavity
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Solution Overview
Problem
The reduction in bezel size of electronic devices due to increased display area has constrained the space available for antennas, necessitating a compact antenna design that can efficiently transmit and receive both horizontal and vertical polarization signals within limited space while maintaining signal bandwidth.
Innovation Solution
The antenna device incorporates a dielectric layer with distinct edges and feed vias, utilizing a capacitively coupled feeding method for horizontal polarization and an L-probe coupled method for vertical polarization, with a layered structure and air cavity to enhance bandwidth and gain, and includes a feed pattern that provides additional resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a compact antenna design is used to fit limited space, then the antenna size is reduced, but the signal bandwidth may be compromised
Solution Approach 1:
The patent divides the antenna system into multiple independent patches (first antenna patch for horizontal polarization, second antenna patch for vertical polarization) that operate at different heights. Each patch can be optimized for its specific polarization and frequency range, allowing the overall antenna to achieve wide bandwidth coverage through the combined operation of segmented elements.
Solution Approach 2:
The patent employs a composite dielectric layer with a specific dielectric constant (e.g., 2.65) and loss tangent to optimize the electrical performance of the compact antenna structure. The dielectric material enables the antenna to achieve resonant frequencies and impedance matching that would be difficult to obtain with air-only structures, thereby maintaining bandwidth in a reduced form factor.
2Adaptability or versatility
If dual polarization support is implemented in a compact space, then both horizontal and vertical polarization signals can be transmitted, but the isolation between signal paths may be reduced
Solution Approach 1:
The patent achieves isolation between horizontal and vertical polarization signal paths by separating them in the vertical dimension. The first antenna patch is positioned at a first height for horizontal polarization, while the second antenna patch is positioned at a second height for vertical polarization. This vertical separation reduces mutual coupling and improves isolation between the two polarization channels.
Solution Approach 2:
The dielectric layer and ground plane act as intermediaries that electrically isolate the feed vias and antenna patches. The feed pattern within the dielectric layer provides controlled impedance coupling to each patch while maintaining isolation between the horizontal and vertical polarization paths. This intermediary structure enables dual polarization support with adequate signal isolation.
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
This configuration allows for efficient transmission and reception of RF signals with both polarizations, maintaining bandwidth and increasing isolation between signal paths, even in a reduced form factor, thereby addressing the space constraints and performance requirements.
Implementation Method 1
utilizing a capacitively coupled feeding method for horizontal polarization
Implementation Method 2
an L-probe coupled method for vertical polarization
Implementation Method 3
with a layered structure and air cavity to enhance bandwidth and gain
Data Source
AI summary
An antenna device includes: a dielectric layer including a first edge extending in a first direction and a second edge, shorter that the first edge, extending in a second direction; a first feed via penetrating a portion of the dielectric layer in a third direction, and disposed adjacent to the second edge; a second feed via penetrating a portion of the dielectric layer in the third direction, disposed adjacent to the first edge; a feed pattern connected to the second feed via; and an antenna patch disposed on the second feed via and the feed pattern in the third direction, and coupled to the first feed via, the second feed via, and the feed pattern. The antenna patch overlaps the first feed via in a direction parallel to the first direction or the second direction. The antenna patch overlaps the feed pattern in a direction parallel to the third direction.