Shielded Loop Antenna Circuit for Electromagnetic Field Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic field detection systems are unable to effectively respond to both high-field and low-field events across the entire signal range, often causing damage to electronic equipment and are either too expensive or unreliable, especially when used in sensitive computing systems.
Innovation Solution
A detection apparatus and method using a shielded loop magnetic antenna with a circuit that includes an equalizer, logarithmic amplifier, and peak detector to capture and infer electrical fields from magnetic field measurements, allowing for the detection of high-field and low-field electromagnetic events with improved dynamic range and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical dipole antennae or Schottky-type diode detector systems are used to detect high-field events, then the system can detect high voltage pulses, but the induced voltage on the antenna causes unpredictable variations in output power and potential damage to downstream circuitry
Solution Approach 1:
The patent introduces an electromagnetically shielded enclosure as an intermediary between the antenna and downstream circuitry. This enclosure acts as a mediator that blocks electromagnetic interference while allowing the detection function to operate, thereby preventing induced voltage damage to circuitry while maintaining detection reliability.
Solution Approach 2:
The patent replaces traditional electrical field-based detection with magnetic field-based detection using a loop antenna. This substitution fundamentally changes the detection mechanism, allowing the system to detect electromagnetic events without the harmful induced voltages that plague electrical dipole antenna systems.
2Adaptability or versatility
If traditional electrical antennas are used to detect both high-field and low-field events, then the system aims to cover the entire signal range, but the system cannot effectively respond to both event types across the entire frequency range
Solution Approach 1:
The patent creates a universal detection system using a loop antenna that can effectively detect both high-field and low-field electromagnetic events across a broad frequency range. The magnetic field-based detection mechanism provides multi-functionality, eliminating the need for separate detection systems for different event types while maintaining reliable detection effectiveness.
3Reliability
If high voltage antenna configurations are used near sensitive electronic equipment, then the system can detect high-field events, but it is difficult to manage the antenna configuration in the proximity to shielded equipment
Solution Approach 1:
The electromagnetically shielded enclosure serves as a mediator that allows the high-voltage antenna configuration to operate near sensitive equipment without direct interference. The enclosure manages the electromagnetic field interactions, making the system easier to operate while maintaining high-field detection capability.
4Measurement precision
If D dot detectors are used to measure time rate of change of electrical displacement, then the system can detect electromagnetic fields, but the integration over time makes it difficult to capture events across the entire expected signal range
Solution Approach 1:
The patent replaces electrical displacement-based detection with magnetic field-based detection using a loop antenna. This substitution eliminates the time integration requirement, allowing the system to directly capture electromagnetic events across the entire signal range without the limitations of D dot detector integration.
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 enables comprehensive detection of electromagnetic events, preventing damage to electronic equipment by accurately capturing peak values of electromagnetic pulses, thereby protecting sensitive systems from both high and low field interference.
Implementation Method 1
monitoring a magnetic field of an electromagnetic wave using a shielded loop magnetic antenna
Implementation Method 2
a logarithmic amplifier electrically connected to the equalizer and configured to generate a range of signals based on signals received at the antenna
Data Source
Figure 1
Figure 2
Figure 3A~4
AI summary
A method and apparatus configured to detect electromagnetic field events are disclosed. One apparatus includes an antenna and a circuit electrically connected to the antenna. The circuit includes electronics communicatively connected to the antenna via a direct current isolation circuit and an equalizer compensating for the differentiating frequency response of the antenna. The circuit also includes a logarithmic amplifier electrically connected to the equalizer and configured to generate a range of signals based on signals received at the antenna. The circuit further includes a peak detector receiving signals from the equalizer and configured to capture a peak value of the signals. The electromagnetic field event is detected at least in part based on the peak signal value.