Wafer-Scale UWB Antenna Arrays for Security Screening
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Solution Overview
Problem
Current security technologies, such as X-ray systems, face challenges in detecting hidden objects like weapons or explosives due to radiation exposure concerns and privacy issues, necessitating the development of alternative methods for effective screening in public places.
Innovation Solution
The implementation of small, compact, ultra wideband (UWB) radar sensing and imaging systems with wafer scale active array antennas that utilize integrated transmitter and receiver modules with RHCP and LHCP antenna arrays for spatial power combining and beam forming, enabling detection of concealed objects with enhanced image resolution and reduced size, weight, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray technology is used for security screening, then detection capability is improved, but radiation exposure and privacy concerns worsen
Solution Approach 1:
The patent replaces X-ray technology with ultra-wideband (UWB) radar technology that uses non-ionizing electromagnetic waves in the 3.1-10.6 GHz range. This substitution eliminates radiation exposure concerns while maintaining detection capability through radar-based imaging that can penetrate clothing and detect concealed objects without the harmful effects of ionizing radiation.
Solution Approach 2:
The patent changes the frequency parameter from X-ray frequencies to ultra-wideband frequencies (3.1-10.6 GHz). This parameter change allows the system to achieve effective detection of concealed objects while using non-ionizing radiation, thereby resolving the contradiction between detection capability and radiation safety.
2Reliability
If conventional radar systems are used, then detection function is provided, but size, weight, and power consumption increase
Solution Approach 1:
The patent merges the transmitter and receiver modules into an integrated UWB radar system with wafer-scale active array antennas. This integration combines multiple functions into a single compact unit, significantly reducing the system's size and weight while maintaining full detection functionality through coordinated operation of the integrated components.
Solution Approach 2:
The patent transitions from conventional bulky radar systems to wafer-scale integrated circuits, representing a dimensional change from macro-scale to micro-scale implementation. This miniaturization through integration enables the radar system to achieve portable dimensions with reduced weight while preserving detection capabilities through advanced circuit design and antenna arrays.
3Reliability
If conventional radar systems are used, then detection function is provided, but power consumption increases
Solution Approach 1:
The patent merges transmitter and receiver functions into an integrated UWB radar system with wafer-scale active array antennas. This integration reduces power consumption by eliminating redundant components and optimizing signal paths, while maintaining detection function through efficient use of power amplifiers and low-noise amplifiers within the integrated architecture.
Solution Approach 2:
The patent employs ultra-wideband frequency parameters (3.1-10.6 GHz) that enable efficient power usage. The wide bandwidth allows for short pulse transmission with low peak power, and the integrated wafer-scale design optimizes power distribution across the antenna array, achieving effective detection with reduced overall power consumption compared to conventional narrowband radar systems.
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
These systems effectively detect concealed weapons and contraband with improved image resolution and reduced radiation exposure, achieving side lobe suppression and cross polarization, while being more compact and energy-efficient compared to conventional radar systems.
Implementation Method 1
integrated transmitter and receiver modules with RHCP and LHCP antenna arrays
Implementation Method 2
right hand circularly polarized (RHCP) and left hand circularly polarized (LHCP) antenna arrays
Implementation Method 3
receiving reflected signals from the first transmitted signal
Implementation Method 4
ultra wideband (UWB) radar sensing and imaging systems
Data Source
AI summary
A system includes: a planar antenna array that includes a plurality of right-hand circularly polarized (RHCP) antennas and left-hand circularly polarized (LHCP) antennas in a planar surface or in layers, in which each antenna element includes a spiral plate; a feed network connecting a signal to each of the antennas; and amplifiers dispersed in the feed network configured to provide spatial power combining and beam forming of the signal. A method for detecting concealed objects includes: scanning with a first transmitted signal having a first polarization; receiving reflected signals from the first transmitted signal; scanning with a second transmitted signal having a second polarization different from the first polarization; receiving reflected signals from the second transmitted signal; performing image processing using reflected signals with the first polarization; performing image processing using reflected signals with the second polarization; and combining the image processing from both polarizations to provide enhanced image resolution.