Multilayer Antenna Unit With Via-Defined Radiation Cavity
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Solution Overview
Problem
Conventional antennas suffer from small bandwidths, undesirable back radiation, unwanted surface wave radiation, and poor isolation when arranged in arrays, leading to suboptimal performance.
Innovation Solution
The antenna unit incorporates a first and second conductive layer with a radiation cavity defined by vias and a planar conductive ring, along with a feed conductor that extends between these layers to improve isolation and impedance for wide scanning angles, resulting in symmetrical gain patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional antennas are arranged in an array, then coverage area is increased, but isolation between antennas deteriorates
Solution Approach 1:
The antenna structure is segmented into multiple functional layers (first substrate layer, second substrate layer, third substrate layer) with distinct ground planes and radiation elements. This segmentation allows each layer to perform specific functions (feeding, radiation, grounding) that collectively improve isolation between array elements while maintaining overall coverage area
Solution Approach 2:
The patent transitions from a conventional planar antenna structure to a three-dimensional multilayer configuration. By stacking multiple substrate layers with ground planes at different heights and positions, the antenna achieves improved isolation in the vertical dimension while maintaining horizontal coverage, effectively resolving the contradiction between array coverage and element isolation
2Ease of manufacture
If conventional antennas use simple feed structures, then manufacturing is simplified, but gain pattern symmetry deteriorates
Solution Approach 1:
The feed structure employs an asymmetric configuration where the feed line is positioned closer to one edge of the radiation patch, creating intentional asymmetry in the feeding arrangement. This asymmetric feeding, combined with the symmetric ground plane structure, produces symmetric gain patterns in the radiation characteristics while maintaining manufacturability through standard PCB fabrication techniques
3Device complexity
If conventional antennas lack cavity structures, then device complexity is reduced, but isolation and impedance stability worsen
Solution Approach 1:
The antenna design implements a nested cavity structure where the radiation cavity is formed by nesting conductive walls within the multilayer substrate structure. The first ground plane, second ground plane, and side walls create a cavity that contains the radiation region, with feeding structures nested within this cavity. This nested configuration improves isolation and impedance stability while controlling overall device complexity through integrated fabrication
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 enhances isolation and active impedance, providing improved symmetrical gain patterns and reduced unwanted radiation, addressing the limitations of conventional antennas.
Implementation Method 1
the main opening with the surrounding vias define a radiation cavity
Data Source
AI summary
An antenna unit is provided. The antenna unit includes a first substrate, a first conductive layer, a second conductive layer, a first planar conductive ring and a feed conductor. The first substrate includes a first surface and a second surface, wherein the first surface is opposite to the second surface. The first conductive layer is disposed on the first surface. The second conductive layer is disposed on the second surface, wherein a main opening surrounded by a plurality of first conductive vias electrically connecting the first and the second conductive surface is formed on the second conductive layer, and the main opening defines a radiation cavity and center frequency. The first planar conductive ring surrounds the radiation cavity. The feed conductor feeds a wireless signal to the antenna unit. Both the first planar conductive ring and the feed conductor are placed between the first conductor layer and the second conductor layer.