Multi-slot Aperture Antenna for Stable Omnidirectional Radiation
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Solution Overview
Problem
The electromagnetic spectrum is overcrowded, leading to interference in wireless communications, which can hinder successful transmission and reception, especially due to the limited use of certain frequency bands and the prevalence of vertically polarized signals.
Innovation Solution
A horizontally polarized antenna with a multi-slot aperture design that reduces variation in the far-field radiation pattern, maintaining a maximum to minimum gain variation of less than 3 dB, thereby minimizing interference and improving communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single aperture antenna is used, then the antenna structure is simple, but the far-field radiation pattern shows significant variation (2.5 dB to 4 dB) in the horizontal plane
Solution Approach 1:
The single aperture is divided into multiple slots arranged in a circular pattern. This segmentation allows the antenna to maintain a simpler overall structure while achieving a more stable omni-directional radiation pattern by distributing the radiating elements uniformly around the aperture.
2Productivity
If vertically polarized signals are used in overcrowded frequency bands, then communication coverage is achieved, but electromagnetic interference increases and transmission reliability decreases
Solution Approach 1:
The patent employs horizontal polarization instead of the conventional vertical polarization, creating an asymmetric approach to the problem. This polarization asymmetry allows the antenna to operate in crowded frequency bands with reduced interference from vertically polarized signals, thereby improving transmission reliability while maintaining communication coverage.
3Object-affected harmful factors
If horizontally polarized signals are used to reduce interference, then electromagnetic interference is reduced, but maintaining a well-behaved omni-directional pattern with minimal gain variation becomes challenging
Solution Approach 1:
The aperture is segmented into multiple slots arranged symmetrically in a circular pattern. This segmentation approach enables the antenna to radiate horizontally polarized signals while maintaining a stable omni-directional pattern with minimal gain variation, as the uniform distribution of slots ensures consistent radiation in all horizontal directions.
Solution Approach 2:
Each slot in the multi-slot aperture is designed with specific local characteristics (size, orientation, position) that are optimized to contribute to the overall horizontal polarization and omni-directional pattern. The local quality of each slot is tailored to ensure that the collective radiation pattern maintains minimal gain variation while reducing interference.
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 multi-slot antenna design enhances communication reliability by reducing interference from vertically polarized signals, maintaining a well-behaved omni-directional pattern with minimal gain variation, thus ensuring effective wireless communication.
Implementation Method 1
An antenna having a single aperture may introduce a significant disparity in the field strength and consequently a difference in the surface current density along the opposite surface from the aperture of the antenna. This results in a difference in the radiation intensity and, hence, a difference in the far field radiation pattern
Implementation Method 2
Example embodiments of antennas having a multi-slot aperture that reduce the variation in the far field omni-directional pattern are described herein
Data Source
AI summary
Horizontally polarized and dual polarized antennas are described herein. In some examples, a horizontally polarized and dual polarized antenna may be mounted or operated with the physical vertical axis of the antenna being substantially perpendicular to a plane defined by the surface of the earth, and emanate an electric field that is parallel to the surface of the earth. The antenna may have a multi-slot aperture that reduces a variation in the far field omni-directional pattern. The antenna may have various cross-sectional configurations, and may have a radome at least partially surrounding the antenna and a supporting structure.