Spiraled Slot Antenna Layout for Compact Multi-Antenna Devices
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Solution Overview
Problem
Conventional slot antennas require a significant footprint due to their length, limiting the number of antennas that can be implemented in compact wireless devices.
Innovation Solution
A compact spiraled slot antenna is designed by layering components such as heat spreaders, PCBs, and antenna compliment rings, forming a spiraled slot that reduces the overall footprint while maintaining the required effective length for the desired output wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional slot antenna is used, then the antenna can provide stable radiation performance, but the antenna occupies a large footprint area that limits the number of antennas in compact devices
Solution Approach 1:
The patent transitions the slot antenna from a planar two-dimensional structure to a three-dimensional spiraled structure. The slot is configured to extend through multiple layers of the PCB board, utilizing the vertical dimension (Z-axis) to achieve the required effective length while minimizing the horizontal footprint area. This dimensional transformation allows the antenna to maintain its radiation performance while occupying significantly less surface area.
Solution Approach 2:
The slot antenna is nested within the multi-layer PCB structure, with the slot extending through intermediate layers rather than occupying the entire surface area. The antenna path is embedded within the board's internal structure, allowing other components to be placed on the surface without interfering with the antenna's radiation characteristics.
2Area of stationary object
If the slot length is reduced to decrease footprint, then the antenna occupies less area, but the radiation capability deteriorates due to insufficient effective length
Solution Approach 1:
The patent resolves this contradiction by extending the slot in the vertical dimension through multiple PCB layers. The effective length of the slot is maintained by utilizing the Z-axis depth of the board, allowing the horizontal footprint to be minimized while the three-dimensional path length provides sufficient effective length for radiation.
Solution Approach 2:
The slot is configured in a spiraled or curved path rather than a straight line, allowing the effective length to be increased within a compact footprint. The curved trajectory through multiple layers enables the antenna to achieve the required electrical length while occupying minimal surface area.
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 compact spiraled slot antenna allows for more antennas to be placed in wireless devices with minimal increase in size, supporting a wide bandwidth and enabling efficient wireless communication.
Implementation Method 1
A slot antenna includes a metal surface (a ground plate), usually a flat plate, with one or more holes or slots cut out. This plate and hole or slot is driven as an antenna by a driving frequency, the slot radiates electromagnetic waves in a way similar to a dipole antenna.
Data Source
AI summary
A wireless device with a slot antenna includes one or more heat spreaders, a PCB with vias to allow current to flow through the PCB, various components disposed on the PCB, and a slot antenna compliment. By layering the components, e.g., heat spreaders, PCB, slot antenna compliment, etc. one or more slot antennas are formed from these components as to integrate the slot antennas into the existing structure. The formed slot antenna is a spiraled shape as to reduce the overall footprint of the slot antenna while keeping the required quarter-wavelength total effective length of an open-slot antenna. The formed slot antenna is wide enough to allow the antenna to accommodate a wide bandwidth and may include a plurality of steps to further allow for tuning of the length of the slot antenna. The wireless device can further include a housing enclosing the internal components.