Broadband Omnidirectional Antenna with Galvanic Isolation
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Solution Overview
Problem
Existing omnidirectional antennas have limitations in their lower frequency range due to overall height and diameter constraints, making it difficult to cover a broader frequency spectrum efficiently and cost-effectively.
Innovation Solution
A broadband omnidirectional antenna design featuring a first radiator with a conical shape and a second radiator that is galvanically isolated and fed by the first radiator, with a coupling device using coupling webs to extend the lower frequency limit, allowing operation from 600 MHz to 6 GHz without a separate feed line for the second radiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the overall height and diameter of the antenna are limited, then the antenna can be produced more compactly and cost-effectively, but the lower frequency range is constrained
Solution Approach 1:
The antenna is divided into two galvanically isolated radiators: a first radiator (conical or monopole) and a second radiator (cylindrical or loop), each contributing to different frequency ranges. This segmentation allows compact dimensions while achieving broadband operation through the combined effect of both radiators
Solution Approach 2:
The second radiator is positioned inside or near the first radiator, with the cylindrical second radiator nested within the conical first radiator structure. This nesting arrangement achieves compact overall dimensions while maintaining the electrical independence and functional distinction of both radiating elements
2Adaptability or versatility
If a second radiator is added to extend the lower frequency limit, then the frequency spectrum coverage is improved, but the device complexity increases
Solution Approach 1:
Both radiators are mounted on a common base plate and fed from a single feed point, merging the support and feeding structures. The radiators are galvanically isolated but electrically coupled through capacitive coupling, combining multiple functions into a unified antenna system that achieves broadband operation without proportionally increasing complexity
Solution Approach 2:
Capacitive coupling acts as an intermediary mechanism between the first and second radiators, enabling energy transfer and interaction without galvanic connection. This intermediary coupling allows the radiators to work together for broadband performance while maintaining their electrical independence and avoiding complex direct connections
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 design achieves a broader frequency range while maintaining a compact and cost-effective production process, enhancing bandwidth and reducing production costs.
Implementation Method 1
the coupling device comprises one or more coupling webs, with a first end of the coupling web or the coupling webs being galvanically connected to the radiator surface of the second radiator and extending in the direction of the base plate
Implementation Method 2
The first end, ie the base and/or feed point of the first radiator, is galvanically isolated from the base plate, but is arranged closer to the base plate than the second end
Data Source
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AI summary
A broadband omnidirectional antenna (1) comprises a first radiator (2) which is galvanically isolated from a base plate (3) and extends away from it. The first radiator (2) comprises a first end (2a) with a feed point and/or feed point (5) and a second end (2b) opposite the first end (2a), and radiator surfaces (6) that originate in the region of the first end (2a) and extend towards the second end (2b). Furthermore, a second radiator (11) is provided, which comprises at least one radiator surface (12), wherein the second radiator (11) is galvanically isolated from the first radiator (2) and is preferably only feedable by the first radiator (2).The emitter surfaces (12) of the second emitter (11) are arranged in extension to the first emitter (2) or at least one emitter surface (12) of the second emitter (11) is arranged parallel to the base plate (3) in the area of the second end (2b) of the first emitter (2).