Circular Polarization Antenna with Perpendicular Loop Branches
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Solution Overview
Problem
Existing antenna structures for radio-based access systems in vehicles face challenges with linear polarization, leading to inefficient communication due to hand sensitivity and alignment issues, resulting in unreliable connections over varying distances and orientations.
Innovation Solution
A compact antenna device with two non-closed conductor loop branches arranged perpendicular to each other, connected via a web structure and fed by an HF feed line, producing circularly polarized radiation with high field strengths and low hand sensitivity, eliminating the need for a matching network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linearly polarized antennas (monopole or loop) are used, then the antenna structure is simple and easy to manufacture, but hand sensitivity increases and communication reliability decreases
Solution Approach 1:
The antenna is divided into two perpendicular conductor loop branches (first and second antenna branches) that are spaced apart in the vertical direction. Each branch is fed by the HF feed line at its center, creating two independently radiating elements. This segmentation allows the antenna to generate circularly polarized waves while maintaining structural simplicity and ease of manufacture.
Solution Approach 2:
The patent transitions from linear polarization (single dimension) to circular polarization by arranging two conductor loop branches perpendicular to each other in space. The branches are spaced apart in the vertical dimension, creating a three-dimensional antenna structure that radiates circularly polarized waves in all horizontal directions, thereby eliminating hand sensitivity issues.
2Loss of energy
If monopole antennas are used, then radiation efficiency is high, but hand sensitivity increases due to smaller ground counterpoise
Solution Approach 1:
The antenna is segmented into two perpendicular conductor loop branches spaced vertically apart. This segmentation creates a balanced structure where the mutual coupling between branches compensates for the lack of large ground counterpoise, maintaining high radiation efficiency while reducing hand sensitivity.
Solution Approach 2:
The two conductor loop branches are arranged perpendicular to each other and spaced apart in the vertical direction, creating an asymmetric three-dimensional structure. This asymmetric arrangement generates circular polarization, which is insensitive to hand contact and orientation, while maintaining efficient radiation through the perpendicular configuration.
3Adaptability or versatility
If circularly polarized antennas are implemented using traditional structures, then polarization adaptability is improved, but device complexity increases due to matching networks
Solution Approach 1:
The antenna is divided into two perpendicular conductor loop branches, each fed by the HF feed line at its center. This segmentation creates a balanced structure that naturally generates circular polarization without requiring complex matching networks, thereby maintaining polarization adaptability while reducing device complexity.
Solution Approach 2:
The two-perpendicular-loop antenna structure serves multiple functions simultaneously: it generates circularly polarized waves for polarization adaptability, eliminates the need for matching networks by using direct center feeding, and maintains structural simplicity. This multi-functional design achieves polarization versatility without increasing complexity.
4Reliability
If antenna branches are arranged perpendicular to each other in vertical direction, then circular polarization is achieved with low hand sensitivity, but manufacturing precision requirements increase
Solution Approach 1:
The antenna is segmented into two independent conductor loop branches that can be manufactured separately and then assembled. The perpendicular arrangement and vertical spacing are designed to be tolerant of typical manufacturing variations, reducing the impact of alignment precision requirements while maintaining circular polarization performance.
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
Ensures reliable radio connections over long distances with adaptable polarization, reducing hand sensitivity and manufacturing costs while maintaining high radiation power and compact design suitable for small mobile devices.
Implementation Method 1
producing circularly polarized radiation with high field strengths
Data Source
AI summary
An antenna device has a first antenna branch and a second antenna branch. Both the first and the second antenna branches have the shape of a non-closed conductor loop and are connected to each other to form a cohesive conductor loop. The respective loop ends are disposed parallel to each other at a distance directed perpendicular (z axis) to the course of the loop. The antenna device has two connections that are disposed in the center section of the cohesive conductor loop at a distance from each other.