Compact EMU Impulse Antenna Using High-Permittivity Materials
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Solution Overview
Problem
Current electromagnetic (EM) surveying systems face challenges in generating high-power, low-frequency signals with small apertures and matching impedance to geological matrices, leading to inefficient transmission and unclear measurements due to high-current cabling issues.
Innovation Solution
A compact, high-power dipole antenna with energy storage and pulse forming elements is developed, utilizing materials with high dielectric permittivity and magnetic permeability to optimize impedance matching and reduce antenna length, combined with a fast-closing switch for pulsed transmission, eliminating the need for separate impedance matching components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an overly large antenna is used to generate low frequency signals from a small antenna, then the signal generation capability is improved, but the device size and complexity increase
Solution Approach 1:
The patent applies parameter changes by using materials with high dielectric permittivity and magnetic permeability to alter the electromagnetic properties of the antenna system. This allows the antenna to achieve low-frequency signal generation capability without requiring a physically large structure, as the material properties effectively transform the electrical length and impedance characteristics of the compact antenna elements.
Solution Approach 2:
The patent utilizes composite materials with high dielectric permittivity and magnetic permeability to construct the antenna elements. These composite materials enable the antenna to achieve enhanced electromagnetic performance and low-frequency operation while maintaining a compact physical size, resolving the contradiction between signal generation capability and antenna size.
2Power
If high-current cable is used to provide power to the EM transmitter, then the power delivery capability is improved, but the measurement clarity deteriorates due to signal transmission in the cable
Solution Approach 1:
The patent merges the energy storage function and the transmitting antenna function into a single integrated structure. The antenna elements themselves serve as capacitive energy storage elements, eliminating the need for separate high-current power cables. This integration removes the source of measurement interference while maintaining the ability to deliver high power to the transmitter.
Solution Approach 2:
The antenna structure provides its own energy storage capability through its capacitive elements, making the system self-sufficient. The antenna elements store energy directly and release it during transmission without requiring external high-current cabling, thereby eliminating the interference that would otherwise contaminate the measurements.
3Adaptability or versatility
If separate impedance matching components are used to match system impedance to the geological matrix, then the impedance matching capability is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the antenna elements to simultaneously perform multiple functions: radiation, energy storage, and impedance matching. The capacitive antenna elements are configured to naturally match the impedance of the geological matrix without requiring additional matching components, thereby reducing system complexity while maintaining adaptability.
Solution Approach 2:
The patent combines impedance matching functionality into the antenna structure itself rather than using separate matching components. The capacitive elements of the antenna are designed with specific geometries and material properties that provide inherent impedance matching to the geological matrix, eliminating the need for additional matching networks or components.
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 provides a clean, high-power transient RF signal with increased radiation resistance and transmitter efficiency, minimizing reflections and losses, and enabling effective electromagnetic imaging of subsurface hydrocarbon reservoirs.
Implementation Method 1
The material can be selected so that e and mu of such material optimizes transmitter impedance to match the external medium. This increases the capacitance and inductance of the system and decreases the group velocity of the signal traveling along the antenna element
Implementation Method 2
The material can be selected so that e and mu of such material optimizes transmitter impedance to match the external medium. This increases the capacitance and inductance of the system and decreases the group velocity of the signal traveling along the antenna element
Implementation Method 3
An energy storage capacitor of the sonde assembly includes an electrode mounted in each of the first section and the second section of the sonde assembly and operable to generate an electric field, and a capacitive charge storage medium mounted in each of the first section and the second section of the sonde assembly and surrounding each electrode
Implementation Method 4
A fast-closing switch, such as a triggered spark gap, is provided between a pair of such antennas to initiate pulsed transmission. The pair of antennas is biased apart by a large voltage so that the structure can discharge in a single massive current pulse and emit a very high power transient radio frequency signal
Data Source
AI summary
An electromagnetic energy source for emitting pulses of electromagnetic energy includes a sonde assembly having a first section axially aligned with, and spaced from, a second section. An energy storage capacitor of the sonde assembly includes an electrode mounted in each of the first section and the second section of the sonde assembly and operable to generate an electric field, and a capacitive charge storage medium mounted in each of the first section and the second section of the sonde assembly and surrounding each electrode. The sonde assembly further includes a fast-closing switch located between the electrodes of the first and second sections of the sonde assembly.