Antenna Element Horizontal Polarization Efficiency
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Solution Overview
Problem
Conventional bent monopoles, such as flagpole and rod monopoles, exhibit changing polarization with frequency, resulting in a decreasingly horizontally polarized signal component at higher frequencies, which reduces the efficiency of horizontal, high-frequency radiation and fails to provide a consistently polarized signal near conductive surfaces.
Innovation Solution
An antenna element is designed with a radiator and counterpoise positioned between imaginary planes, allowing for improved horizontal polarization efficiency at higher frequencies, with the ability to produce a consistently polarized signal by adjusting the phase and amplitude of signals applied to multiple antenna elements, enabling flexible polarization control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rod monopole is used to reduce vertical polarization, then vertical polarization is reduced, but horizontal polarization efficiency at high frequencies deteriorates due to proximity to the ground plane
Solution Approach 1:
The patent positions the feed point at a height above the ground plane (typically λ/4 or higher), moving the radiation source away from the problematic near-ground region. This vertical displacement allows the horizontal polarization component to radiate more effectively without being constrained by ground plane proximity, thereby improving horizontal polarization efficiency at high frequencies while maintaining signal consistency across the operating band.
Solution Approach 2:
The patent modifies the feed point location parameter (height above ground plane) and the orientation of the radiator element. By changing these parameters, the antenna achieves improved horizontal polarization radiation efficiency while maintaining consistent signal characteristics across the frequency band, resolving the contradiction between the two performance aspects.
2Adaptability or versatility
If bent monopoles are used near conductive surfaces, then horizontal polarization is achieved, but vertical polarization increases with frequency reducing signal consistency
Solution Approach 1:
The patent employs multiple antenna elements that can be independently controlled in terms of phase and amplitude. This dynamic control capability allows the system to adapt the polarization characteristics as needed while maintaining overall signal consistency, resolving the contradiction between polarization flexibility and consistency.
Solution Approach 2:
The antenna system is designed to provide multiple polarization modes (horizontal, vertical, and intermediate polarizations) through a single multi-element structure. This universal design allows the antenna to adapt to different application requirements while maintaining consistent performance across the operating frequency band.
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 antenna element achieves a more consistent horizontally polarized signal with improved radiation efficiency at higher frequencies and broader impedance bandwidth compared to conventional monopoles, allowing for flexible polarization control and reduced vertical polarization.
Implementation Method 1
the antenna element achieves a more consistent horizontally polarized signal with improved radiation efficiency at higher frequencies
Implementation Method 2
the ability to produce a consistently polarized signal by adjusting the phase and amplitude of signals applied to multiple antenna elements
Data Source
AI summary
An antenna element is provided that is adapted to provide a more consistent horizontally polarized signal. In one embodiment, a radiator and counterpoise are provided with the counterpoise being disposed between the radiator and a ground plane in use. The feed location for feeding the radiator and the counterpoise is significantly spaced from the ground plane in use and the radiator and counterpoise diverge relative to this feed location.