Antenna Feeding Network Indirect Interconnection
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Solution Overview
Problem
Existing antenna feeding networks for multi-radiator antennas face challenges in assembly complexity and passive intermodulation (PIM) due to mechanical connections between coaxial lines, which affect impedance matching and signal transmission.
Innovation Solution
The antenna feeding network employs indirect interconnections, such as capacitive or inductive coupling, between coaxial lines using a connector device with insulating layers, allowing for easy assembly and reduced PIM, while maintaining high performance by using air-filled coaxial lines with optional dielectric elements for phase shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical connections (screws, soldering, gluing) are used to connect inner conductors of coaxial lines, then electrical connection is achieved, but passive intermodulation increases and assembly becomes complex
Solution Approach 1:
A connector element serves as an intermediary between inner conductors, providing electrical connection through capacitive coupling rather than direct mechanical contact. The connector includes insulating portions that electrically isolate while maintaining signal transmission, eliminating PIM issues associated with mechanical connections.
Solution Approach 2:
The patent replaces mechanical connection methods (screws, soldering, gluing) with an electrical field-based connection mechanism. The connector element creates capacitive coupling between conductors without physical contact, substituting mechanical fastening with electromagnetic field interaction.
2Reliability
If mechanical connections are used between coaxial lines, then electrical connection is established, but assembly time and complexity increase
Solution Approach 1:
The connector element simplifies assembly by providing a pre-fabricated intermediary component that requires no complex mechanical fastening operations. The connector is positioned between conductors and maintains electrical connection through its capacitive structure, eliminating multiple assembly steps required for mechanical connections.
3Reliability
If direct physical contact connections are used between inner conductors, then electrical connection is achieved, but impedance matching becomes difficult to maintain
Solution Approach 1:
By replacing mechanical contact with capacitive coupling, the patent eliminates the sensitivity to mechanical tolerances and contact pressure variations that affect impedance matching. The capacitive connection provides consistent electrical characteristics independent of physical contact quality.
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
This solution simplifies the assembly process, reduces passive intermodulation, and maintains impedance matching, enabling efficient signal transmission and reception in multi-radiator antennas.
Implementation Method 1
The first inner conductor, the second inner conductor, and optionally further inner conductors, are indirectly interconnected... capacitive or inductive interconnection
Implementation Method 2
The first inner conductor, the second inner conductor, and optionally further inner conductors, are indirectly interconnected... capacitive or inductive interconnection
Data Source
Figure 1
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Figure 4~5
AI summary
An antenna feeding network for a multi-radiator antenna,the antenna feeding network comprising at least two coaxial lines. Each coaxial line comprises a central inner conductor and an elongated outer conductor surrounding the central inner conductor. At least a first inner conductor and a second inner conductor of the at least two coaxial lines are indirectly interconnected.