Dual-Polarization Antenna Element Using Cylindrical Support
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Solution Overview
Problem
Existing dual-polarization radiating elements for multiband antennas fail to simultaneously meet the requirements of good radio performance, efficient RF current distribution, simple feeding structure, cost-effectiveness, and ease of multiband integration, with most designs either requiring large reflectors, complex feeding networks, or limited surface area for additional radiating elements.
Innovation Solution
A dual-polarization radiating element with a cylindrical support of high dielectric constant, featuring pairs of orthogonal dipoles printed on its surface and fed by conductive lines, positioned on a flat reflector with the cylindrical axis perpendicular to the reflector, allowing for controlled beamwidth and efficient multiband operation using a shared reflector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coaxial radiating elements with orthogonal half-wave dipoles are used, then radio performance is good, but the surface area for distributing RF current is limited requiring a wide reflector
Solution Approach 1:
The patent transitions from conventional planar dipole arrangements to a three-dimensional configuration where dipoles are positioned at vertices of a tetrahedron. This spatial arrangement increases the effective surface area for RF current distribution without requiring a larger reflector, thereby resolving the contradiction between maintaining good radio performance and reducing reflector size.
Solution Approach 2:
The patent employs a composite structure combining multiple dipole elements (orthogonal and skew dipoles) with a feed network integrated into a compact housing. This composite approach allows efficient RF current distribution across a larger effective area while maintaining a compact overall structure, eliminating the need for an oversized reflector.
2Area of stationary object
If half-wave dipoles separated by one-half wavelength are used, then RF current distribution surface area is wide, but feeding structure complexity increases with four feed points
Solution Approach 1:
The patent merges multiple feed points into a single feed location by using a feed network that distributes the signal to all four dipole vertices through a compact arrangement. This consolidation reduces feeding structure complexity while maintaining the wide RF current distribution surface area provided by the separated dipole configuration.
Solution Approach 2:
The patent introduces a feed network as an intermediary component that bridges the single feed point and the four dipole vertices. This mediator distributes the RF signal efficiently to all dipoles without requiring four separate feed points, thereby simplifying the feeding structure while preserving the beneficial wide current distribution area.
3Area of stationary object
If alternative radiating elements from the second family are used, then surface area for RF current distribution is sufficient, but multiband integration is limited due to overlapping technique requirements
Solution Approach 1:
The patent designs a universal radiating element structure with four dipoles arranged at tetrahedron vertices that can serve multiple frequency bands simultaneously. The compact feed network and symmetric geometric arrangement allow the same structure to be used across different bands without requiring overlapping techniques, thereby enhancing multiband integration capability while maintaining sufficient RF current distribution surface area.
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 provides stable radio performance across a broad frequency band, reduces antenna size and cost, and enables efficient multiband integration by using a shared reflector, while maintaining low assembly and material costs, thus addressing the limitations of existing designs.
Implementation Method 1
a support with a high dielectric constant whose shape is roughly cylindrical
Implementation Method 2
at least one first and one second pair of dipoles printed onto a first surface of the support, the dipoles of the first pair being roughly orthogonal to the dipoles of the second pair
Implementation Method 3
The invention falls within the scope of directive antennas, meaning antennas whose beamwidth in the horizontal plane is divided into sectors. The reflector, owing to its flat shape and its placement perpendicular to the cylindrical support, makes it possible to control the dividing of the pattern in the horizontal plane
Data Source
AI summary
A dual-polarization radiating element for a multiband antenna comprises a support with a high dielectric constant whose shape is roughly cylindrical, having an axis of revolution, at least a first and a second pair of dipoles printed on a first surface of the support, the dipoles of the first pair being roughly orthogonal to the dipoles of the second pair, and conductive lines, to feed each dipole, printed onto a second surface of the support. The support is placed on a flat reflector, with the cylindrical support's axis of revolution being perpendicular to the plane of the reflector.