Series-Fed Waveguide Port Layout for Low-Sidelobe Radiation
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Solution Overview
Problem
Current waveguide antennas have complex three-dimensional structures and high machining costs due to their precise requirements, and they also suffer from high sidelobe levels that affect radiation efficiency.
Innovation Solution
A series-fed waveguide apparatus with reduced spacing between radiation ports and a bent structure is designed to suppress grating lobes, simplifying the structure, lowering machining precision needs, and reducing costs while maintaining high radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a parallel-fed waveguide antenna is used, then radiation efficiency is improved, but device complexity and machining costs increase
Solution Approach 1:
The patent inverts the conventional parallel-fed waveguide structure by using a series-fed configuration where radiation ports are arranged sequentially along the waveguide path. This inversion simplifies the three-dimensional structure while maintaining effective radiation through the tapered design, resolving the contradiction between radiation efficiency and structural complexity.
Solution Approach 2:
The waveguide is divided into multiple sections with varying cross-sectional dimensions, creating a tapered structure with multiple radiation ports. This segmentation allows the electromagnetic energy to be progressively radiated along the tapered path, maintaining radiation efficiency while simplifying the overall structure compared to conventional parallel-fed designs.
2Device complexity
If spacing between radiation ports is increased, then device complexity is reduced, but grating lobes increase and sidelobe levels rise
Solution Approach 1:
The patent applies parameter changes by progressively varying the cross-sectional dimensions of the waveguide sections and adjusting the spacing between radiation ports according to specific mathematical relationships. This controlled parameter variation suppresses grating lobes and reduces sidelobe levels while maintaining structural simplicity, resolving the contradiction between structure simplicity and harmful radiation patterns.
3Manufacturing precision
If machining precision requirements are increased, then antenna performance is improved, but manufacturing costs increase
Solution Approach 1:
The patent employs parameter changes through a tapered waveguide design where cross-sectional dimensions and radiation port positions follow progressive mathematical sequences. This approach maintains acceptable antenna performance while reducing the stringency of machining precision requirements compared to conventional designs, thereby lowering manufacturing costs.
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 reduces the complexity and machining costs of waveguide antennas while achieving low sidelobe levels and improved radiation transmission efficiency.
Implementation Method 1
A waveguide is a structure used to directionally guide electromagnetic waves. The waveguide mainly serves as a transmission line for a microwave frequency, and is used to connect a microwave transmitter and a microwave receiver to their respective antennas
Data Source
AI summary
A waveguide apparatus and a related product are provided. The waveguide apparatus includes a first waveguide cavity, a first radiation port, and a second radiation port. A spacing between a radiation end of the first radiation port and a radiation end of the second radiation port is less than a spacing between a connection end of the first radiation port and a connection end of the second radiation port. The connection end of the first radiation port and the connection end of the second radiation port are both connected to the waveguide cavity.