Omnidirectional Antenna System With Compact Dipole Configuration
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Solution Overview
Problem
Designing a small-size, omnidirectional antenna system for wireless access points is challenging due to indoor signal reflection and multipath fading, requiring efficient signal processing from various transmission directions in limited spaces.
Innovation Solution
The antenna system comprises multiple dipole antennas and transmission lines arranged in a symmetrical configuration with specific radiation branches and positions, forming square shapes to achieve omnidirectional coverage and miniaturization, while maintaining performance across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional antenna designs are used, then omnidirectional coverage is achieved, but the antenna size becomes too large for limited wireless access point spaces
Solution Approach 1:
The antenna system is divided into multiple dipole antenna elements (first through fourth dipole antennas) arranged in specific spatial configurations. Each dipole antenna consists of two radiation branches forming angles less than 100 degrees, creating segmented functional units that collectively achieve omnidirectional coverage while reducing overall system volume
Solution Approach 2:
The patent transitions from planar antenna arrangements to three-dimensional spatial configurations by positioning dipole antennas at different heights and orientations within the wireless access point housing. This dimensional expansion enables omnidirectional coverage in limited space by utilizing vertical and angular dimensions
2Volume of moving object
If antenna size is reduced for compact wireless access points, then space efficiency improves, but signal processing capability from various transmission directions deteriorates
Solution Approach 1:
Each dipole antenna element is specifically configured with radiation branches forming angles less than 100 degrees, creating localized optimized radiation patterns. The transmission lines are individually routed and impedance-matched to ensure each element contributes effectively to overall signal processing reliability despite the compact size
Solution Approach 2:
The dipole antennas are positioned asymmetrically within the housing rather than in a symmetric arrangement, with specific dipole antennas located at different distances from the housing walls. This asymmetric positioning optimizes signal reception from various directions while maintaining compact dimensions
Data Source
AI summary
An antenna system includes a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a first dipole antenna, a second dipole antenna, a third dipole antenna, a fourth dipole antenna, a fifth dipole antenna, a sixth dipole antenna, a seventh dipole antenna, and an eighth dipole antenna. Each dipole antenna is coupled through a corresponding transmission line to a feeding point. Each of the fifth dipole antenna, the sixth dipole antenna, the seventh dipole antenna, and the eighth dipole antenna is positioned between the feeding point and a corresponding one of the first dipole antenna, the second dipole antenna, the third dipole antenna, and the fourth dipole antenna. Each of the partial dipole antennas includes a positive radiation branch and a negative radiation branch. The angle between the positive radiation branch and the negative radiation branch is less than 100 degrees.