Varactor Diode Metamaterial for Dynamic Electromagnetic Wave Steering
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Solution Overview
Problem
Current metamaterials used for adjusting electromagnetic waves are either mechanically cumbersome, costly, or complex in control circuitry, limiting their dynamic adjustability and application range.
Innovation Solution
A method involving a metamaterial with electrically controllable units, each containing a varactor diode, where the capacitance is adjusted to change the phase difference of reflected electromagnetic waves, allowing for dynamic adjustment of the reflection direction by determining a target capacitance based on a predetermined angle and applying a corresponding voltage across the varactor diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical rotation is used to adjust electromagnetic wave direction, then the electromagnetic wave can be dynamically adjusted, but the scanning speed is low, the device is heavy and occupies large space, and mechanical faults occur frequently
Solution Approach 1:
The patent replaces the mechanical rotation system with an electrical control system using varactor diodes. Instead of physically rotating the metamaterial structure, the invention electronically adjusts the capacitance of varactor diodes integrated into the metamaterial units, which changes the phase of reflected electromagnetic waves and thereby steers the beam direction. This substitution eliminates mechanical moving parts, increases scanning speed, and reduces device weight and space occupation.
Solution Approach 2:
The invention changes the electrical parameters (capacitance values) of the varactor diodes to achieve dynamic adjustment of electromagnetic wave direction. By varying the capacitance of varactor diodes through applied voltage, the phase shift of reflected waves is controlled, enabling electronic beam steering without mechanical movement. This parameter-based control resolves the contradiction between adaptability and scanning speed.
2Adaptability or versatility
If mechanical rotation is used to adjust electromagnetic wave direction, then the electromagnetic wave can be dynamically adjusted, but the device is heavy and occupies large space
Solution Approach 1:
The patent replaces the mechanical rotation system with an electrical control system using varactor diodes. Instead of physically rotating the metamaterial structure, the invention electronically adjusts the capacitance of varactor diodes integrated into the metamaterial units, which changes the phase of reflected electromagnetic waves and thereby steers the beam direction. This substitution eliminates mechanical moving parts, increases scanning speed, and reduces device weight and space occupation.
3Adaptability or versatility
If controllable components such as PIN diode are used to control electromagnetic parameters, then the electromagnetic wave can be adjusted, but the control circuit is quite complex and costs are very high
Solution Approach 1:
The invention changes the electrical parameters (capacitance values) of the varactor diodes to achieve dynamic adjustment of electromagnetic wave direction. By varying the capacitance of varactor diodes through applied voltage, the phase shift of reflected waves is controlled, enabling electronic beam steering without mechanical movement. This parameter-based control resolves the contradiction between adaptability and scanning speed.
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
Enables simple and fast dynamic adjustment of electromagnetic waves over a large range, improving the metamaterial's application range while reducing complexity and cost, with a reflection loss less than -2 dB.
Implementation Method 1
determining a target capacitance of the varactor diode in each electrically controllable metamaterial unit based on the first phase difference; and adjusting a capacitance of the varactor diode in each electrically controllable metamaterial unit to the target capacitance
Implementation Method 2
the electrically controllable metamaterial unit comprises a varactor diode
Implementation Method 3
determining a first phase difference between electromagnetic waves reflected by two adjacent electrically controllable metamaterial units in a metamaterial based on a predetermined angle
Data Source
AI summary
A metamaterial comprises a plurality of electrically controllable metamaterial units each comprising a varactor diode; the predetermined angle is an angle at which an electromagnetic wave is reflected from a surface of the metamaterial; there is an association relationship between the predetermined angle and the first phase difference; the method comprises: determining a first phase difference between electromagnetic waves reflected by two adjacent electrically controllable metamaterial units in a metamaterial based on a predetermined angle; determining a target capacitance of the varactor diode in each electrically controllable metamaterial unit based on the first phase difference; and adjusting a capacitance of the varactor diode in each electrically controllable metamaterial unit to the target capacitance.