Series-Connected Antenna Structure for Omnidirectional Radiation
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Solution Overview
Problem
Conventional antenna structures fail to achieve omnidirectional radiation with high gain due to asymmetrical radiation patterns caused by grounding effects, resulting in a low degree of roundness in their radiation patterns.
Innovation Solution
A series-connected antenna structure is designed with an insulating substrate, multiple antennas, and connecting lines arranged symmetrically on both sides, where the connection ends of the antennas are electrically coupled to main and subordinate sections of the connecting lines, forming symmetrical shapes to improve the roundness of the radiation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If antennas are symmetrically arranged on two sides of the circuit board to achieve omnidirectional radiation, then the radiation pattern symmetry is improved, but the difference between radiation patterns on either side becomes too large and the degree of roundness is too low
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of antennas on a single side of the circuit board to a three-dimensional configuration where antennas are arranged on both sides of the board. By utilizing the third dimension (depth/thickness of the circuit board), the patent achieves better radiation pattern symmetry and roundness without the harmful interference that plagues single-sided arrangements.
Solution Approach 2:
The patent employs asymmetrical arrangement of antennas within each symmetrical plane. Specifically, the connecting lines are designed with asymmetrical paths to achieve impedance matching and optimize radiation characteristics. This controlled asymmetry in line routing compensates for the symmetrical antenna placement, resolving the contradiction between symmetry and roundness.
2Power
If conventional antenna structures use dipole antennas for serial connection to achieve high gain, then the gain is improved, but the radiation pattern cannot meet the omnidirectional requirement due to ground influence
Solution Approach 1:
The patent divides the single dipole antenna into multiple smaller antenna elements arranged in series. Instead of using one large dipole antenna, the invention segments it into several smaller dipoles connected through impedance-matching networks. This segmentation allows each element to contribute to omnidirectional radiation while maintaining high overall gain through the series connection configuration.
Solution Approach 2:
The patent designs the antenna system to perform multiple functions simultaneously: achieving high gain through series connection of multiple dipoles, maintaining omnidirectional radiation capability by strategic placement, and providing impedance matching through the connecting network. The connecting lines serve both as electrical connections and as impedance transformation elements, demonstrating multi-functionality.
Data Source
AI summary
A series-connected antenna structure is provided. The series-connected antenna structure includes an insulating substrate, a first connecting line, two first antennas, a second connecting line, two second antennas, and a load point. Two sub-antennas of one of the two first antennas are electrically coupled to a main section of the first connecting line, and two sub-antennas of another one of the two first antennas are respectively and electrically coupled to two subordinate sections of the first connecting line. Two sub-antennas of one of the two second antennas are electrically coupled to a main section of the second connecting line, and two sub-antennas of another one of the two second antennas are respectively and electrically coupled to two subordinate sections of the second connecting line. Each of the two second antennas and each of the two first antennas face opposite directions.