Ceiling-Mount Omnidirectional Antenna High-Angle Gain
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Solution Overview
Problem
Existing ceiling-mount omnidirectional antennas suffer from rapid gain attenuation at high radiating angles in high frequency bands, leading to limited coverage radius and uneven signal distribution, and require multiple antennas to achieve adequate 3G coverage, resulting in increased investment and power wastage.
Innovation Solution
A ceiling-mount omnidirectional antenna with a conical-column monopole and disc-cone reflecting plate structure, optimized to increase gain at high radiating angles and reduce gain at low angles, ensuring consistent coverage across frequencies and reducing un-roundness of the radiation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ceiling-mount omnidirectional antenna with a flat reflecting plate and monopole structure is used, then the antenna gain is stable at low radiating angles in low frequency bands, but the gain attenuates rapidly at high radiating angles in high frequency bands, resulting in limited coverage radius and uneven signal distribution
Solution Approach 1:
The reflecting plate is divided into multiple reflecting elements arranged in an array configuration. Each reflecting element can be independently optimized to control the radiation pattern at different radiating angles, allowing the antenna to maintain stable gain across both low and high angles while expanding coverage radius
Solution Approach 2:
Different regions of the reflecting plate are designed with varying properties - the central region and edge regions have different reflecting characteristics to independently optimize low-angle and high-angle radiation respectively. This local differentiation allows simultaneous improvement of coverage uniformity and effective radius
2Reliability
If multiple conventional antennas are deployed to achieve adequate 3G coverage, then the coverage uniformity improves, but the investment cost and power consumption increase significantly
Solution Approach 1:
The antenna design achieves multi-frequency band compatibility (2G and 3G networks) and multi-angle coverage capability within a single antenna structure. The reflecting plate array can be configured to optimize performance across different frequency bands simultaneously, eliminating the need for separate antennas for different networks and reducing overall power consumption
3Reliability
If the reflecting plate size is increased to strengthen the reflecting effect at high frequency bands, then the gain at high radiating angles improves, but the antenna protrusive height increases, impacting indoor circumstances
Solution Approach 1:
The reflecting plate transitions from a two-dimensional flat surface to a three-dimensional array structure with elements positioned at different depths. This dimensional transformation allows the reflecting elements to be compactly arranged while maintaining effective reflecting area, improving high-angle gain without significantly increasing protrusive height
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 solution enhances signal strength and coverage uniformity, increasing the effective coverage radius by three times, reduces the need for multiple antennas, and allows for synchronous 2G and 3G network coverage, while minimizing electromagnetic radiation and power consumption.
Implementation Method 1
The reflecting plate is equivalent to another arm of dipole antenna. On one hand, it forms a mirror image of monopole and reflects electric waves at the same time so as to strengthen radiation at the side of monopole. The higher the frequency, the stronger the reflection
Data Source
Figure 1a~1b
Figure 1
Figure 2a~2b
AI summary
A ceiling-mount omnidirectional antenna for indoor distribution system of mobile communication network and a method for manufacturing the same are provided. The antenna includes: a monopole consisting of a cone part and a columnar part; a reflecting plate consisting of a cone part and a platform part; and a feed connector. The monopole and the reflecting plate are arranged in such that the tips of cone parts are opposite to each other. The signal is fed into the antenna through the feed connector and radiated outward by the monopole and the reflecting plate. In high frequency band, the maximal gain appears at about 70°, so that the signal power focuses at radiating angles of 60°~85°. Comparing to the existing antenna, the gain of the antenna increases 4.22dB at a radiating angle of 85°and decreases 10dB at a radiating angle of 30°. So, the maximal permissible value of antenna aperture power of mobile communication signal in high frequency band, such as 3G, is increased; and the field strength of signal covering the edge is increased. The antenna can increase the covering range of a single antenna, increase the.signal quality, and cover 2G and 3G networks in the same time so as to reduce the difficulty and the cost for building and reconstructing an indoor distribution system in 3G.