Double-Layer Waterproof Feedhorn Design for Satellite Antennas
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Solution Overview
Problem
Existing waterproof parts for feedhorns in satellite antennas compromise radiating efficiency and useful bandwidth due to dielectric and impedance differences, making it difficult to simultaneously improve return loss and bandwidth.
Innovation Solution
A double-layered waterproof design with two interfaces, where the reflected waves from each layer are out-of-phase to cancel each other, enhancing return loss and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layered waterproof part is used, then the feedhorn is protected from rain water, but the return loss deteriorates and useful bandwidth becomes narrower
Solution Approach 1:
The waterproof part is divided into two separate layers (first waterproof layer and second waterproof layer) instead of using a single layer. Each layer has specific thickness requirements (first thickness between λ/8-3λ/8, second thickness between λ/16-3λ/16) to control the phase of reflected waves, enabling them to cancel each other out and improve both waterproof performance and bandwidth simultaneously.
Solution Approach 2:
The invention changes the physical parameters of the waterproof structure by specifying precise thickness ranges for each layer relative to the wavelength λ. By controlling the thickness parameters within specific ranges, the reflected waves from each layer achieve the desired phase relationship for cancellation, thereby resolving the contradiction between waterproofing and bandwidth performance.
2Reliability
If a waterproof part is added, then rain water protection is improved, but radiating efficiency decreases due to dielectric and impedance differences
Solution Approach 1:
The invention converts the harmful reflected waves (which cause energy loss and reduced radiating efficiency) into a beneficial effect by designing the two-layer structure to produce out-of-phase reflected waves that cancel each other. The dielectric and impedance differences that originally caused harmful reflections are now utilized to create the phase difference needed for cancellation, turning the harm into a benefit.
3Reliability
If a waterproof part is used, then return loss may be improved under some conditions, but useful bandwidth becomes narrower
Solution Approach 1:
The invention transitions from a single-dimensional (single-layer) waterproof structure to a two-dimensional (multi-layer) structure with different thickness dimensions. This dimensional change allows independent optimization of each layer's thickness to control wave phase relationships, enabling simultaneous improvement of return loss and bandwidth that cannot be achieved with a single layer.
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 double-layered waterproof design improves both return loss and useful bandwidth, expanding the application range of the feedhorn while maintaining radiating efficiency.
Implementation Method 1
the first and second reflected waves are substantially out-of-phase to substantially cancel the first and second reflected waves
Data Source
AI summary
A waterproof part for a feedhorn includes a first waterproof unit having a first interface for generating a first reflected wave and a first transmitted wave when a satellite signal incidents the first interface, and a second waterproof unit covering on the first waterproof unit and having a second interface for generating a second reflected wave and a second transmitted wave when the first transmitted wave incidents the second interface, wherein the first and second reflected waves are substantially out-of-phase to substantially cancel the first and second reflected waves.