Frequency-Scalable Imaging Radar With NLTL Beam Steering
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Solution Overview
Problem
Existing detection equipment, such as metal detectors and medical imagers, are limited in dynamic range, depth information, and functionality, and often distract operators with insufficient information communication, particularly in high-security and medical settings.
Innovation Solution
A frequency-scalable imaging radar system using nonlinear transmission line (NLTL)-based technology, combining millimeter wave transmission and reception with beam-steerable antennas and vector network analyzer components to provide two-dimensional and three-dimensional imaging capabilities, enhanced channel isolation, and dynamic range, while reducing operator distraction through improved information communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing detection equipment (metal detectors, backscatter x-ray scanners, millimeter wave scanners) is used, then detection capability is provided, but the equipment is limited in dynamic range, depth information, and functionality
Solution Approach 1:
The patent employs frequency scaling by changing the operating parameters of the radar system. By using a frequency multiplier to convert RF signals to millimeter wave frequencies and implementing frequency-stepped continuous wave operation, the system achieves improved dynamic range and depth information while maintaining detection capability. The variable delay line also changes temporal parameters to enable beam steering.
2Adaptability or versatility
If existing imagers are used, then imaging function is provided, but the equipment is expensive, limited in dynamic range, limited in depth information, or limited in functionality
Solution Approach 1:
The radar system is designed to perform multiple functions using a single integrated platform. It can operate in frequency-stepped continuous wave mode for imaging, provide beam steering through variable delay lines, and achieve both detection and characterization of concealed objects. This multi-functionality reduces the need for separate specialized equipment, thereby reducing overall system complexity and cost.
3Loss of information
If detection equipment is coupled to monitors for displaying images, then imaging information is provided, but the attention of technicians or physicians is divided between the monitor and the patient
Solution Approach 1:
The patent replaces traditional monitor-based visual display with acoustic output through headphones or speakers. This substitution allows the operator to receive imaging information auditorily while maintaining visual contact with the patient, eliminating the distraction caused by monitor viewing and improving ease of operation in medical settings.
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 system enables efficient detection and imaging of concealed objects with improved spatial coverage, speed, and reduced operator distraction by providing clear, detailed images of concealed features and objects, enhancing security and medical imaging applications.
Implementation Method 1
A nonlinear transmission line (NLTL)-based frequency multiplier is arranged along the signal path to receive an RF signal from the RF signal source and increase a frequency of the RF signal to millimeter frequency to produce a millimeter wave
Implementation Method 2
A time delay of an NLTL of the NLTL-base variable delay line is variable to steer a beam of the millimeter wave in at least one dimension as the millimeter wave is transmitted by the antenna
Implementation Method 3
The receiver receives a local oscillator (LO) signal from the RF signal source and downconverts sampled signals to intermediate frequency (IF) signals
Data Source
AI summary
An imaging device includes an antenna configured to transmit millimeter waves, a connector adapted to connect a radio frequency (RF) signal source with the imaging device and a signal path connected between the connector and the antenna. A nonlinear transmission line (NLTL)-based frequency multiplier is arranged along the signal path to receive an RF signal from the RF signal source and increase a frequency of the RF signal to millimeter frequency to produce a millimeter wave. A NLTL-based variable delay line is arranged along the signal path between the NLTL-based frequency multiplier and the antenna. A time delay of an NLTL of the NLTL-base variable delay line is variable to steer a beam of the millimeter wave in at least one dimension as the millimeter wave is transmitted by the antenna. A receiver processes a return signal received in response to the millimeter wave.