Biconical Antenna Assembly With Distal Capacitive Matching
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Solution Overview
Problem
Biconical antenna assemblies known in the state of the art have poor matching at frequencies between 20 to 30 MHz, resulting in lower field strength during EMC testing, necessitating the use of more expensive, powerful amplifiers to achieve the required field strength.
Innovation Solution
The biconical antenna assembly incorporates additional capacitive structures at the most distal points of its antenna structures, improving matching and allowing the use of simpler amplifiers to achieve the desired field strength at low frequencies by increasing the active surface and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional biconical antenna assemblies are used, then the structure is simple, but the matching is poor at frequencies between 20 to 30 MHz resulting in lower field strength
Solution Approach 1:
The antenna structure is divided into separate components: the basic biconical antenna and additional capacitive structures that can be attached to the distal points. This segmentation allows the capacitive elements to be added only where needed to improve matching at 20-30 MHz without redesigning the entire antenna structure.
Solution Approach 2:
Capacitive structures are added specifically at the distal points of the antenna cones, creating local electrical property changes at critical locations. This local modification improves the overall matching quality at low frequencies without affecting the entire antenna structure uniformly.
2Power
If more powerful amplifiers are used to compensate for lower field strength, then the required field strength is achieved, but the testing costs increase
Solution Approach 1:
The electrical parameters of the antenna system are changed by adding capacitive structures, which modifies the impedance characteristics and improves matching. This parameter change enables the antenna to achieve better field strength efficiency, allowing the use of less powerful (and cheaper) amplifiers while still meeting testing requirements.
3Power
If additional capacitive structures are added to improve matching, then the field strength is enhanced by 3 dB up to 6 dB, but the device complexity increases
Solution Approach 1:
The capacitive structures are designed and positioned in advance at the distal points of the antenna. This preliminary configuration ensures optimal matching performance at low frequencies before testing begins, eliminating the need for complex real-time adjustments during operation.
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 improved matching achieved by the additional capacitive structures enables effective EMC testing with a simple amplifier, providing enhanced field strength of up to 6 dB in the 20 to 30 MHz frequency range, reducing the need for high-power amplifiers and associated costs.
Implementation Method 1
the additional capacitive structure leads to an additional capacity at the point at which the additional capacitive structure is attached to the respective antenna structure
Data Source
AI summary
Embodiments of the present disclosure relate to a biconical antenna assembly for electromagnetic compatibility testing. The biconical antenna assembly has an antenna feeding point, a first antenna structure and a second antenna structure. The first antenna structure and the second antenna structure extend from the antenna feed point towards opposite directions. The biconical antenna assembly includes at least one additional capacitive structure that is attached to a most distal point of the first antenna structure or the second antenna structure from the antenna feed point.