Loop Antenna Resonant Frequency Stabilization
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Solution Overview
Problem
Existing terahertz wave sensors face challenges in maintaining a designed resonant frequency and radiation direction due to issues with characteristic impedance, reflection, and high-frequency coupling, particularly when using loop antennas with slender metal lines and non-connection sections that affect capacitive and inductive coupling.
Innovation Solution
The design includes a loop antenna with specific metal line configurations and facing sections where the metal lines intersect at an angle, forming a capacitive and inductive coupling structure that stabilizes the resonant frequency and radiation direction by adjusting the length and thickness of the metal lines and the distance between them, ensuring constant characteristic impedance and minimizing reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the metal lines in the loop antenna are made slender to increase radiation efficiency, then radiation efficiency is improved, but the capacitive coupling in the non-connection section becomes insufficient, causing resonant frequency deviation
Solution Approach 1:
The patent applies local quality by making the metal lines slender in most sections to maximize radiation efficiency, while locally thickening the metal lines at the non-connection section to ensure sufficient capacitive coupling. This localized variation in line thickness allows the antenna to maintain both high radiation efficiency and accurate resonant frequency without compromising either performance metric.
2Ease of operation
If a non-connection section is formed in the metal lines to adjust current density distribution, then the radiation direction is improved, but the characteristic impedance becomes non-uniform, causing signal reflection
Solution Approach 1:
The patent applies parameter changes by carefully controlling the width, length, and position of the non-connection section to achieve the desired current density distribution and radiation direction. By optimizing these geometric parameters, the antenna maintains uniform characteristic impedance despite the presence of the non-connection section, thereby preventing signal reflection while achieving proper radiation direction control.
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
This configuration enhances the radiation efficiency and sensitivity of the terahertz wave sensor by maintaining the desired resonant frequency and radiation direction with reduced noise and improved high-frequency coupling, making it suitable for imaging devices.
Implementation Method 1
a loop antenna configured to include first and second metal lines on a surface of a substrate on or from which terahertz waves are incident or emitted
Implementation Method 2
a rectifying element or an oscillation element electrically connected to the first and second metal lines
Implementation Method 3
a rectifying element or an oscillation element electrically connected to the first and second metal lines
Data Source
AI summary
An element includes a loop antenna configured to include first and second metal lines on a surface of a substrate on or from which terahertz waves are incident or emitted, and a rectifying element or an oscillation element electrically connected to the first and second metal lines. The element has a facing section at which a first surface of a first end not connected to the rectifying element or the oscillation element at an end of the first metal line faces a second surface of a second end not connected to the rectifying element or the oscillation element at an end of the second metal line, a direction in which the first surface faces the second surface is a direction in which the first end extends and is a direction intersecting a direction in which the second end extends.