Coupled Loop Antenna Bandwidth Expansion
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Solution Overview
Problem
Antennas grounded on electrically grounded structures exhibit poor performance due to modified radiation patterns, resulting in significantly reduced bandwidth and impaired signal handling capabilities.
Innovation Solution
Coupling two antennas with different bandwidths through a conductive path and using capacitors to adjust frequency characteristics, allowing them to operate with a combined bandwidth greater than either antenna alone, effectively circumventing the inverse relationship between loop size and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna is mounted on a grounded structure, then installation stability is improved, but bandwidth is reduced
Solution Approach 1:
The patent combines multiple antennas (at least two antennas with different bandwidths) into a single antenna system. By coupling antennas with different bandwidth characteristics, the system achieves a combined bandwidth greater than any individual antenna while maintaining the ability to be mounted on grounded structures.
2Ease of operation
If antenna size is reduced, then ease of installation is improved, but frequency characteristics deteriorate
Solution Approach 1:
The patent merges multiple antennas of different sizes into a coupled system. This allows the system to achieve desired frequency characteristics through the combination of antennas with different size-frequency profiles, rather than requiring a single large antenna.
Solution Approach 2:
The patent employs adjusting means (such as capacitors or inductors) that can dynamically adjust the frequency characteristics of the coupled antenna system. This allows the system to maintain optimal frequency characteristics across different operating conditions while using smaller, more easily installed antennas.
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 significantly increases the bandwidth of the antennal arrangement, enabling it to handle a broader range of signals, with the combined bandwidth being at least five times greater than that of individual antennas, and allows for reduced antenna size while maintaining desired frequency characteristics.
Implementation Method 1
The adjusting means can comprise a capacitor electrically connected to the respective antenna
Implementation Method 2
The first antenna and/or the second antenna can be provided with a space, and the respective antenna can include resonating means which at least partly circumscribes the associated space
Implementation Method 3
The coupling means can comprise a conductor electrically connecting the first antenna and the second antenna to one another
Data Source
AI summary
An antennal arrangement for radio signals includes two loop antennas. Each of the antennas is provided with a capacitor. The antennas are separated from one another by a gap and are coupled to each other by a conductor.