Microwave Beam Power Measurement with Reflection-Blocking Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microwave beam power measurement systems are inefficient, inaccurate, and prone to microwave reflection back into the waveguide, particularly when dealing with frequencies below 170 GHz, leading to uneven power distribution and reduced accuracy.
Innovation Solution
Incorporating a deviation box with a concentrating mirror to collimate the microwave beam and a spherical load with a diffusing mirror, ensuring the beam diameter is smaller than the mirror diameter, combined with thermometers to measure temperature changes in water-cooled coatings for precise power calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional load with a diffusing mirror is used to measure microwave beam power, then the microwave beam can be absorbed and converted to heat for measurement, but microwave reflections return to the waveguide causing measurement inaccuracies and potential damage
Solution Approach 1:
A beam deviator component is introduced as an intermediary element between the waveguide and the load. This beam deviator redirects the reflected microwave beam away from the waveguide using a deviating surface, preventing harmful reflections from returning to the waveguide while maintaining the measurement function of the load.
2Measurement precision
If the microwave beam diameter is large relative to the diffusing mirror, then the beam can be effectively distributed on the inner surface of the load, but areas of concentrated power occur leading to reduced measurement accuracy
Solution Approach 1:
The beam deviator performs a preliminary action by redirecting and conditioning the microwave beam before it enters the load. By adjusting the beam direction and position in advance, the system ensures optimal distribution of microwave power on the inner surface of the load, preventing concentrated power areas and improving measurement accuracy.
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 system provides accurate and reliable power measurement across various frequencies by minimizing microwave reflection and enhancing power distribution, offering improved precision and versatility.
Implementation Method 1
an inner surface coated with an absorbing coating (31) suitable for absorbing microwaves
Implementation Method 2
the electromagnetic power of the microwaves absorbed by the absorbing coating (31) heats the water (5) that laps against the load (3)
Implementation Method 3
the microwave beam exiting the preload (2) enters the inlet opening (30) of the load, strikes the diffusing mirror (4) and is reflected on the absorbing coating (31)
Implementation Method 4
a deviation box with a concentrating mirror to collimate the microwave beam
Implementation Method 5
The load (3) is surrounded by cooling conduits (35) containing water (5) that laps against the load (3) acting as coolant
Implementation Method 6
A thermometer (6) is placed in the water (5) lapping against the load to measure the temperature of the water
Data Source
AI summary
Disclosed is a system for measuring the power of a microwave beam. The system includes a waveguide, a preload, a load, a diffusing mirror disposed inside the load, cooling conduits containing water lapping the against load, a thermometer for measuring the temperature of the water, and calculation means for calculating the power of the microwave beam based on a temperature increase of the water. Wherein the preload has a deviation box with a beam deviator configured in such a way to allow for a deviation and collimation of a microwave beam exiting the deviation box with respect to a microwave beam entering the deviation box.