Meta-surface Water Load for Microwave Absorption
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Solution Overview
Problem
Conventional water loads in microwave applications face challenges with impedance mismatch due to temperature changes in the cooling liquid, leading to reduced absorptive capacity and protection issues for the microwave source, especially at varying flow velocities and temperatures.
Innovation Solution
A meta-surface water load design featuring a waveguide section with meta-surface plates having progressively increasing relative permittivity from front to rear, ensuring one-directional microwave propagation into the water load section, where the cooling liquid absorbs the microwave energy efficiently, eliminating the need for impedance matching pins and maintaining high absorption across a wide range of temperatures and flow velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water load uses pins for impedance matching, then impedance matching can be achieved, but the absorptive effect on microwave energy is weakened when water temperature changes
Solution Approach 1:
The patent changes the physical parameters of the water load system by introducing a meta-surface plate with specifically designed electromagnetic parameters. The meta-surface plate's unit cells have controlled geometric parameters that create desired electromagnetic responses, allowing the system to maintain impedance matching across varying water temperatures without compromising absorption efficiency
Solution Approach 2:
The patent employs a composite structure combining the meta-surface plate (with its unique electromagnetic properties) and the water load section. This composite design allows the meta-surface plate to compensate for temperature-induced impedance changes while the water section maintains its absorption function, resolving the contradiction between impedance matching and absorption efficiency
2Temperature
If the cooling liquid flow rate is increased to meet power capacity requirements, then temperature control is improved, but the device complexity and operational requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-cooling the water in the water chamber before it enters the absorption section. The water pre-cooling section is designed to prepare the cooling liquid in advance, ensuring it enters the main absorption area at the optimal temperature, thereby simplifying ongoing operational control
Solution Approach 2:
The water cooling system is segmented into distinct sections: a water pre-cooling section and a water absorption section. This segmentation allows each section to perform its specific function optimally, with the pre-cooling section handling temperature preparation and the absorption section focusing on microwave energy absorption, thereby simplifying overall system operation
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 meta-surface water load effectively absorbs microwave energy in one direction, reducing reflections back to the microwave source, maintaining high absorptive capacity even with large temperature and flow rate variations, thus protecting the microwave source and ensuring efficient operation.
Implementation Method 1
a relative permittivity of materials from front to rear of each meta-surface plate is progressively increased, so that microwave in the waveguide section is propagated to the water load section in one direction
Implementation Method 2
The microwave transmitted in the waveguide is absorbed by the cooling liquid flowing in the water chamber and converted into the thermal energy
Implementation Method 3
the microwave transmitted in the waveguide is absorbed by the cooling liquid flowing in the water chamber and converted into the thermal energy
Implementation Method 4
the ceramic partition is for separating interior of the waveguide section and interior of the metal casing
Data Source
AI summary
A meta-surface water load includes a waveguide section, a water load section and two meta-surface plates; the water load section is arranged at a rear end of the waveguide section; the two meta-surface plates are arranged opposite on inner walls of two narrow sides of the waveguide section; the water load section includes a metal casing, a ceramic partition, a water inlet and a water outlet; the metal casing is mounted at the rear end of the waveguide section; cooling liquid flows in the metal casing, entering from the water inlet and leaving from the water outlet; the ceramic partition is for separating interior of the waveguide section and interior of the metal casing; a relative permittivity of materials from front to rear of each meta-surface plate is progressively increased, so that microwave in the waveguide section is propagated to the water load section in one direction.