Waveguide Power Distribution Layout for Close-Spaced Antenna Elements
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Solution Overview
Problem
Existing waveguide antennas with multiple slots suffer from low directivity and require complex assembly methods, often involving galvanic connections that disrupt current flow and are costly.
Innovation Solution
A power distribution device for waveguide antennas with symmetrical waveguide sections and branching points that distribute electromagnetic power and adjust amplitude and phase, allowing for independent radiating elements without galvanic connections, using quarter-wave impedance transformers for impedance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple slots are placed on the long side of the waveguide to form an antenna array, then the directivity is improved, but the manufacturing complexity and assembly cost increase due to required galvanic connections
Solution Approach 1:
The waveguide antenna is divided into multiple independent waveguide sections, each with its own radiating element. These sections are connected through a common ground structure rather than requiring galvanic connections between adjacent sections, allowing independent manufacturing and assembly while maintaining array functionality
Solution Approach 2:
A common ground structure serves as an intermediary element that connects all waveguide sections. This ground structure enables power distribution and signal reference without requiring direct galvanic connections between the radiating waveguide sections, simplifying assembly while maintaining electrical integrity
2Reliability
If galvanic connections are used to connect waveguide sections, then electrical continuity is maintained, but current flow is disrupted and manufacturing cost increases
Solution Approach 1:
The common ground structure acts as an intermediary that provides electrical continuity and reference potential to all waveguide sections without requiring soldering or galvanic connections between the radiating elements themselves, thus maintaining reliability while simplifying manufacturing
Solution Approach 2:
The electrical connection function is separated from the radiating structure. Instead of using mechanical galvanic connections (soldering, welding) between waveguide sections, the patent uses a shared ground plane that provides electrical reference through proximity and capacitive coupling, replacing complex mechanical electrical connections with a simpler structural arrangement
3Illumination intensity
If radiating elements are placed close together to reduce side lobes, then directivity is improved, but spacing requirements for conventional waveguide arrays cannot be met
Solution Approach 1:
The antenna array is segmented into independent waveguide sections that can be positioned closely together. Each section is electrically isolated from its neighbors through the ground-connection method, allowing compact spacing without interfering with the electromagnetic fields of adjacent elements, thus enabling close placement to control side lobe levels
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
Enhances directivity and reduces side lobes by enabling close placement of radiating elements while simplifying manufacturing and eliminating the need for soldering, thus reducing costs and complexity.
Implementation Method 1
In a waveguide, electromagnetic energy is transported in a metallic cavity
Implementation Method 2
using quarter-wave impedance transformers for impedance adjustment
Data Source
AI summary
A power distribution device for a waveguide antenna. The power distribution device has a plurality of waveguide sections including an input waveguide section, into which an electromagnetic wave can be coupled, and a plurality of feed waveguide sections. Each feed waveguide section feeds the electromagnetic wave into a respective radiating element of the waveguide antenna for radiating the electromagnetic wave. Each waveguide section has a rectangular cross-section with narrow and long sides. A branching point for power distribution is provided, at which an incoming waveguide section branches into at least two outgoing waveguide sections. The dimensions of the narrow side of the incoming and of the at least two outgoing waveguide sections differ at least partially from one another. The waveguide sections are arranged symmetrically with respect to a plane of symmetry, wherein the plane of symmetry is parallel to the narrow sides.