Omni-directional Ceiling Antenna with Spatially Separated Coupling
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Solution Overview
Problem
Existing omni-directional ceiling antennas suffer from downward signals aggregation and poor radiation pattern roundness in the 1710-2500MHz frequency band, leading to inefficient coverage and high electromagnetic radiation, especially in higher frequency bands like LTE/4G.
Innovation Solution
The design incorporates a cone-cylinder monopole and discone reflecting plate without impedance matching lines, with a spatially separated coupling structure formed by a disc cylinder-shaped base plate and dielectric ring, adjusting the radiation angle and current distribution to reduce electromagnetic radiation and enhance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional omni-directional ceiling antenna structures are used, then impedance bandwidth can be extended, but downward signals aggregation occurs and radiation pattern roundness deteriorates in the 1710-2500MHz frequency band
Solution Approach 1:
The antenna structure is segmented into distinct functional components: a conical oscillator for radiation, a reflecting plate for signal redirection, and impedance matching lines for electrical optimization. Each segment performs a specific function to collectively achieve both wide bandwidth and high radiation pattern quality.
Solution Approach 2:
Different parts of the antenna are designed with locally optimized properties: the conical oscillator provides omnidirectional radiation characteristics, the reflecting plate creates specific radiation patterns by redirecting signals, and impedance matching lines are strategically placed to optimize performance at different frequency bands without compromising overall radiation pattern quality.
2Power
If high gain is achieved at small radiation angles, then coverage capacity under antennas is improved, but electromagnetic radiation intensity increases
Solution Approach 1:
The antenna design changes the radiation pattern parameters by introducing a reflecting plate with specific geometry and positioning. This modifies the gain distribution across different radiation angles, achieving optimized coverage capacity while controlling electromagnetic radiation intensity through precise parameter selection of the reflecting plate dimensions and orientation.
3Power
If signal strength is increased just under antennas, then coverage in vicinity area is improved, but electromagnetic radiation and coverage at coverage radius edge deteriorates
Solution Approach 1:
The reflecting plate acts as a counterbalancing element that redistributes the radiation pattern. It creates a counteracting effect that reduces excessive signal concentration under the antenna while simultaneously enhancing signal strength at the coverage radius edge, achieving more uniform overall coverage.
4Ease of manufacture
If conventional antenna structures are used, then manufacturing simplicity is maintained, but radiation pattern bandwidth and coverage efficiency deteriorate at high frequencies
Solution Approach 1:
The antenna design achieves multi-functionality by integrating a conical oscillator, reflecting plate, and impedance matching lines into a single structure that simultaneously provides wide impedance bandwidth, optimized radiation patterns, and high coverage efficiency across multiple frequency bands including 2G, 3G, and 4G networks.
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
This configuration significantly improves high-frequency signal coverage, reduces electromagnetic radiation, and ensures uniform indoor signal coverage across the 1710-2700MHz band, addressing the limitations of previous antennas.
Implementation Method 1
The conical oscillator can extend impedance bandwidth of the antenna... voltage standing wave ratio (Voltage Standing Wave Ratio; VSWR for short) is less than 1.5 both in 806-960MHz (low frequency band) and 1710-2500MHz band
Implementation Method 2
adjusting the radiation angle and current distribution to reduce electromagnetic radiation and enhance coverage
Data Source
Figure 1
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AI summary
The present invention provides an omni-directional ceiling antenna, including: a cone cylinder-shaped radiation oscillator, a cone cylinder-shaped reflector, a disc cylinder-shaped base plate, and a dielectric ring; where the reflector includes a first hollow cone and a first cylindrical ring, a flared end of the first hollow cone is connected to the first cylindrical ring, and an outer diameter of the first cylindrical ring is smaller than that of the flared end of the first hollow cone; a second cylindrical ring is provided on the base plate, and the second cylindrical ring sockets to the first cylindrical ring to form a spatially separated coupling structure; the dielectric ring is provided between the second cylindrical ring and the first cylindrical ring so as to realize separation and fixed support between the reflector and the base plate. The present invention solves the problem of downward signals aggregation at high frequencies existing in the ultra-wideband indoor omni-directional antenna, which not only extends the effective coverage of signals in the high frequency band to make indoor signal distribution more uniform, but also effectively reduces intensity of electromagnetic radiation under the antenna to ensure security of indoor electromagnetic environments.