Microwave Applicator Ridges and Dielectric Transition for Rock Heating
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Solution Overview
Problem
Existing microwave energy applicators suffer from energy loss and significant reflection when applied to materials, leading to inefficiencies in microwave-based systems for mining rock.
Innovation Solution
The development of a microwave energy applicator with internal longitudinal ridges and a dielectric filler that alters the energy level of microwaves, coupled with a robotic arm and waveguide segments, to focus and concentrate energy on a rock face, minimizing reflection and increasing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If microwave energy is applied over a large area using a waveguide, then the coverage area is increased, but energy loss and reflection increase significantly
Solution Approach 1:
The applicator introduces longitudinal ridges and a dielectric filler that create non-uniform local properties within the channel. These structural variations focus the microwave energy into specific regions rather than distributing it uniformly, thereby maintaining effective energy delivery while reducing overall energy loss and reflection.
Solution Approach 2:
The dielectric filler changes the electromagnetic parameters (permittivity) within the channel, altering how microwaves propagate. This parameter change enables better energy confinement and reduces reflection, allowing effective heating with lower energy loss compared to a standard waveguide.
2Area of stationary object
If microwave energy is applied over a large area using a waveguide, then the coverage area is increased, but reflection increases significantly
Solution Approach 1:
The longitudinal ridges create localized variations in the electromagnetic field distribution. These ridges act as impedance transformers that gradually transition the wave impedance, reducing abrupt reflections at the channel boundaries while maintaining coverage area.
Solution Approach 2:
The dielectric filler acts as an intermediary material between the microwave source and the target material. It provides a gradual impedance transition that reduces reflection by mediating the mismatch between the waveguide and the external environment.
3Quantity of substance
If the applicator channel cross-sectional area decreases, then energy density increases, but transmission loss may increase
Solution Approach 1:
The dielectric filler changes the electromagnetic parameters within the narrowing channel, allowing the cross-sectional area to decrease while maintaining lower transmission loss. The altered permittivity compensates for the geometric constriction, enabling high energy density delivery with reduced energy loss.
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 solution achieves a five-fold increase in energy density and reduces transmission loss to less than -30 decibels, allowing focused microwaves to penetrate up to a quarter of the wavelength into the rock, enhancing mining efficiency.
Implementation Method 1
The applicator may define a channel having a decrease in cross-sectional area with a dielectric filler therein, acting to transition from a lower to a higher permittivity material
Implementation Method 2
When microwave energy is applied to a material, the energy of the microwaves may be absorbed and result in thermomechanical effects as it penetrates the material
Implementation Method 3
The ridges may be moveable... configured to focus energy... concentrate the energy for application at a rock face
Data Source
AI summary
Systems, devices, and methods for a microwave energy applicator. The applicator may define an internal channel having one or more longitudinal ridges inside the channel configured to focus energy. The ridges may be moveable. A reflector may be located near an exit of the applicator. In some embodiments, the applicator may define a channel having a decrease in cross-sectional area with a dielectric filler therein, acting to transition from a lower to a higher permittivity material. The various embodiments of the applicator may be attached to a waveguide, which may be an articulable robotic arm having rotatable waveguide segments attached with a microwave generator. The applicator may alter an energy level of microwaves travelling therethrough, for example, to concentrate the energy for application at a rock face in a mine site.