Dual Polarization Antenna Single Pattern Folded Dipole
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Solution Overview
Problem
Conventional dual polarization dipole antennas have complex structures, difficulty in impedance matching, and reduced broadband characteristics and antenna gain due to uniformly separated dipoles and symmetrical feeding portions made of metal materials.
Innovation Solution
A dual polarization broadband antenna with a single pattern is developed, featuring folded dipole elements formed in a continuous square or rectangular pattern on a radiation device, with a feeding portion that includes crossing feeding points to facilitate signal feeding and polarization, and varying lengths to reduce squint error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four dipoles are uniformly separated and symmetrical feeding portions are used, then dual polarization can be achieved, but the structure becomes complicated
Solution Approach 1:
The patent merges four separate dipoles into a single continuous folded dipole element formed in a square pattern. This integration maintains the dual polarization capability through strategic feeding points at the corners of the square, while significantly simplifying the overall structure by eliminating the need for four separate dipole components and their individual support structures.
Solution Approach 2:
The single continuous folded dipole structure serves multiple functions simultaneously: it provides dual polarization capability, maintains broadband characteristics, and simplifies the feeding mechanism. The square pattern with four feeding points allows the same structure to support both vertical and horizontal polarizations, as well as diagonal polarizations at ±45 degrees.
2Adaptability or versatility
If four uniformly-separated dipoles and symmetrical feeding portions are used, then dual polarization can be achieved, but impedance matching becomes difficult
Solution Approach 1:
The patent applies different characteristics to different parts of the folded dipole structure. The feeding points at the corners are specifically designed with appropriate impedance transformations, while the radiating segments have optimized dimensions. This local differentiation enables proper impedance matching across all four feeding points, facilitating dual polarization operation without the matching difficulties encountered in conventional designs.
3Adaptability or versatility
If four uniformly-separated dipoles and metal feeding portions are used, then dual polarization can be achieved, but broadband characteristic and antenna gain are lowered
Solution Approach 1:
The patent transitions from conventional linear or planar dipole arrangements to a three-dimensional folded configuration in a square pattern. This spatial transformation increases the effective electrical length and creates multiple current paths, which broadens the operational bandwidth and enhances gain while maintaining dual polarization capability through the four-corner feeding arrangement.
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 simplifies the antenna structure, enhances impedance matching, improves broadband characteristics and antenna gain, achieves excellent isolation, and decreases signal noise by forming dual polarizations at +45° or −45° angles, while maintaining high efficiency across a broad frequency range.
Implementation Method 1
transmits polarized electrical radiation at an angle of +45° or −45° in relation to a predetermined arrangement of dipoles
Implementation Method 2
causes polarization through the vector addition of electrical fields formed by the flow of a current fed to the feeding portion
Data Source
AI summary
The present invention relates to a dual polarization broadband antenna having a single pattern, which is provide with a radiation device having a square structure, in which a plurality of folded dipole elements are formed in a single continuously-connected pattern, and a feeding portion for feeding signals to the plurality of folded dipole elements is formed on the radiation device. Accordingly, the plurality of folded dipole elements formed on the radiation device are connected in a single square and rectangular pattern, so that the structure thereof is simplified, with the result that the cost can be reduced. Furthermore, the feeding portion, that dually feeds signals, and the plurality of folded dipole elements, connected in a single pattern, are coupled, so that the dual polarization characteristic can be easily acquired. Furthermore, currents input to the feeding points of the feeding portion are induced only to the folded dipole elements without having to flow into other feeding points, so that excellent isolation can be achieved.