Concentric Feed Electrical Connection via Conductive Gasket
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Solution Overview
Problem
Dual band or dual polarization concentric feeds in antennas face challenges in achieving a consistent electrical connection between the inner and outer conductive tubes, leading to poor return loss and reduced antenna gain due to manufacturing inconsistencies at high frequencies.
Innovation Solution
The concentric feed design includes specific geometries and connection methods, such as configuring the outer and inner conductive tubes with precise surfaces and using an electrically conductive gasket, to ensure a robust and repeatable electrical connection, optimizing impedance matching and reducing gaps for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional connection methods are used for inner and outer conductive tubes, then manufacturing is easier, but electrical connection consistency deteriorates at high frequencies
Solution Approach 1:
The connection features (protrusions, recesses, lips) are pre-configured on the inner and outer conductive tubes before assembly. This preliminary configuration ensures that when the tubes are connected, the electrical connection is automatically established at the correct position and orientation, achieving consistent electrical connection without requiring complex post-assembly adjustments or high-precision alignment procedures during manufacturing
Solution Approach 2:
An electrically conductive gasket is introduced as an intermediary element between the inner and outer conductive tubes. The gasket fills gaps and ensures reliable electrical contact while accommodating manufacturing tolerances. This intermediary component simplifies the connection process by providing a forgiving interface that maintains electrical consistency without requiring extremely tight manufacturing tolerances on the tubes themselves
2Reliability
If the electrical connection between inner and outer conductive tubes is not robust, then manufacturing is simpler, but return loss performance deteriorates
Solution Approach 1:
The connection structure is segmented into distinct features: protrusions on one tube, corresponding recesses on the other tube, and lips at the connection interface. This segmentation allows each feature to perform a specific function (alignment, electrical contact, mechanical bonding) while keeping the overall structure relatively simple. The modular nature of these segmented features makes them easy to manufacture and assemble while ensuring robust electrical connection
Solution Approach 2:
The connection features are designed to be self-aligning and self-securing. The protrusions fit into recesses, the lips make contact, and the structure inherently guides the tubes into the correct position during assembly. This self-service design ensures reliable electrical connection without requiring complex external alignment tools, specialized assembly procedures, or additional fastening mechanisms, thereby achieving robust connection with minimal added complexity
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 approach results in consistently high performance across multiple concentric feeds, reducing variations and enhancing antenna gain by ensuring a reliable electrical connection and impedance match, even at high frequencies.
Implementation Method 1
The outer-conductive tube is electrically connected at a base of an inner-conductive tube to an outer-conductive tube
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A concentric feed is provided. The concentric feed includes an outer-conductive tube electrically connected at a base of an inner-conductive tube to an outer-conductive tube by a process comprising the steps of: configuring the outer-conductive tube; configuring the inner-conductive tube; and positioning the outer-conductive tube to contact the inner-conductive tube at the base. The outer-conductive tube is configured to include: a side-port; a first-edge surface; a first-interior surface sharing an edge with and perpendicular to the first-edge surface; a second-edge surface; and a second-interior surface sharing an edge with and perpendicular to the second-edge surface. The inner-conductive tube is configured to include: the base at a base-end of the inner-conductive tube, the base including a first lip and a second lip protruding orthogonal to a first surface and a second surface, respectively, and a central-port centered on the central axis and parallel to the central axis; and a main-body.