Millimeter Wave Half Mirror Slit Thickness Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing millimeter-wave band radio wave half mirrors suffer from deteriorated transmittance characteristics and increased loss due to spatial radiation and inflexibility in design, making it difficult to achieve flat frequency response and high sensitivity measurements in the ultra-wideband frequency range beyond 100 GHz.
Innovation Solution
A radio wave half mirror structure is introduced, featuring a blocking portion with a slit in a waveguide transmission line, where the thickness and width of the blocking portion are optimized based on transmittance characteristics to flatten the transmittance characteristics, reducing spatial radiation loss and enhancing frequency accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a confocal Fabry-Perot resonator with spherical reflecting mirrors is used to achieve a large Q value, then the Q value is improved, but the passband tuning becomes complex and requires selective use of mirrors with different curvatures
Solution Approach 1:
The patent uses spherical reflecting mirrors with a specific curvature radius R1 in the confocal Fabry-Perot resonator. The curvature is carefully selected to achieve both a large Q value and proper passband tuning characteristics, resolving the contradiction between high Q value and tuning complexity
Solution Approach 2:
The patent optimizes the curvature radius parameter of the spherical mirrors to achieve the desired balance between Q value and passband characteristics. By changing the curvature parameter, the system achieves both high reliability and simplified tuning
2Stability of the object's composition
If plane waves are achieved by increasing the diameter of the waveguide, then plane wave incidence is improved, but the size of the device increases
Solution Approach 1:
The patent employs a horn antenna with a curved profile to transform cylindrical waves into plane waves. This curved geometry allows effective plane wave incidence without requiring an excessively large waveguide diameter, thus resolving the contradiction between wave quality and device size
3Device complexity
If an open-type resonator is used, then the structure is simplified, but loss caused by spatial radiation increases
Solution Approach 1:
The patent converts the potentially harmful spatial radiation loss into a beneficial effect by using a waveguide structure that controls and directs the radiation. The waveguide transforms the open resonator's radiation into useful guided waves, turning energy loss into useful signal transmission
4Force
If the thickness of the blocking portion is increased to improve reflection, then reflection is improved, but transmittance characteristics deteriorate and become non-flat
Solution Approach 1:
The patent optimizes the thickness parameter of the blocking portion to achieve the desired balance between reflection and transmittance characteristics. By carefully selecting the thickness parameter, the system achieves both good reflection and flat transmittance across the operating bandwidth
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 optimized radio wave half mirror achieves flat transmittance characteristics across a wide frequency range, reducing assembly complexity and manufacturing costs while maintaining high sensitivity and accuracy in millimeter-wave measurements.
Implementation Method 1
a slit (22) for transmitting electromagnetic waves that is provided so as to traverse the blocking portion
Implementation Method 2
reflects some of incident electromagnetic waves
Data Source
AI summary
To provide a radio wave half mirror for a millimeter wave band which can flatten transmittance characteristics and a method of flattening the transmittance of the radio wave half mirror for a millimeter wave band. A radio wave half mirror 20 includes a metal plate 21 that has an outward shape closing a transmission line 11 and a slit 22 for transmitting electromagnetic waves that is provided in the metal plate 21 along a long side of an opening of the transmission line 11. The thickness L of the metal plate 21 in a direction in which the electromagnetic waves pass through the slit 22 is set on the basis of the transmittance characteristics of the electromagnetic waves.