Plasma Antenna Frequency Switching High RF Power
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Solution Overview
Problem
Existing antenna devices with variable capacitive diodes struggle to operate effectively at high RF power levels, as the RF voltage becomes too high for the variable capacitive element, making it difficult to switch directivity or operation frequency.
Innovation Solution
An antenna device using a sealed case with rare gas and electrodes, where the maximum size of the electrodes and their distance is equal to or smaller than one tenth the wavelength, and a power source applies variable voltage to ionize the gas into a plasma state, creating a variable capacitive element for dynamic frequency control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable capacitive diode is used for switching directivity or operation frequency, then the antenna can change radiation patterns or frequency, but the RF voltage becomes too high for the variable capacitive element to operate normally when RF power is high
Solution Approach 1:
The patent changes the physical state of the dielectric material from solid (in conventional varactor diodes) to plasma state. By controlling the ionization level of the plasma through power input, the capacitance can be varied while maintaining operation at high RF power levels. The plasma's electrical properties can be dynamically adjusted by changing the degree of ionization, allowing the capacitor to function reliably across high power conditions where solid-state varactors fail.
Solution Approach 2:
The invention utilizes the phase transition of gas to plasma. By ionizing gas molecules to create plasma, the dielectric material transitions from a neutral gas phase to an ionized plasma phase. This phase transition enables the capacitor to handle high RF power levels while maintaining variable capacitance control, as the plasma state can be maintained stable even under high power conditions that would damage solid-state components.
2Speed
If the size of electrodes and distance between them is reduced to achieve plasma ionization, then the capacitive element can operate at high frequencies, but the physical dimensions become very small
Solution Approach 1:
The patent employs gas ionization to plasma phase transition within a compact sealed chamber. By confining the plasma-generating process in a small sealed space with electrodes positioned close together, the system achieves rapid plasma formation and response. The small chamber size ensures that the plasma can be quickly ionized and controlled, providing fast signal response while maintaining manageable physical dimensions through the sealed enclosure design.
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 allows for reliable switching of operation frequency and directivity, ensuring effective operation even at high RF power levels by controlling the plasma's permittivity and capacitance.
Implementation Method 1
a power source applying variable voltage to the first and second electrodes to ionize the rare gas in the sealed case into a plasma state
Implementation Method 2
controlling the plasma's permittivity and capacitance
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A sealed case (6) includes a first electrode (4) and a second electrode (5) . The maximum size of each of these electrodes and a distance between them are equal to or smaller than one tenth the wavelength of a signal of interest. The sealed case (6) is configured such that the internal gas becomes a plasma state. The second electrode (5) is connected to a first conductor (1), and the first electrode (4) is connected to a second conductor (2) disposed to be perpendicular to the first conductor (1).