Terahertz Antenna Array Beam Steering Without Motorized Optics
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Solution Overview
Problem
Existing terahertz imaging systems rely heavily on motorized beam steering methods, which are large, heavy, expensive, and have issues with power consumption, reliability, and slow image acquisition.
Innovation Solution
A terahertz imaging system utilizing a terahertz antenna array composed of hundreds or thousands of antenna elements that employ phased array beam steering techniques, each element featuring a patch antenna, a one bit phase shifter, and storage elements for phase state management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motorized beam steering methods (motorized reflector mirrors, gimbaled sample stage, actuated lenses) are used, then beam steering capability is achieved, but the system becomes large, heavy, expensive, and experiences slow image acquisition with reliability issues
Solution Approach 1:
The patent replaces motorized mechanical beam steering systems with an electronic phased array system. Instead of using motorized reflector mirrors, gimbaled sample stages, or actuated lenses, the invention uses multiple antenna elements with programmable phase shifters that electronically control beam direction. This substitution eliminates moving parts, reducing mechanical complexity and improving reliability while enabling faster beam steering through digital control.
Solution Approach 2:
The patent divides the antenna system into multiple discrete antenna elements (hundreds or thousands of elements) arranged in an array. Each element can be independently controlled with its own phase shifter and storage elements. This segmentation allows electronic beam steering by adjusting the phase of each individual element, replacing the need for single large mechanical steering components and enabling parallel control for faster image acquisition.
2Productivity
If motorized beam steering methods are used, then beam steering is achieved, but image acquisition speed becomes slow
Solution Approach 1:
The patent replaces mechanical beam steering with electronic phase control. By using programmable phase shifters and storage elements in each antenna element, the system can rapidly change beam direction through digital signal processing without mechanical movement. This electronic control enables much faster beam steering and image acquisition compared to motorized systems limited by mechanical inertia and movement speed.
Solution Approach 2:
The patent incorporates storage elements in each antenna element that can pre-store phase states corresponding to different beam directions. This preliminary preparation of phase information allows the system to rapidly switch between beam directions by simply retrieving pre-computed phase states, eliminating the time required for mechanical repositioning and enabling faster image acquisition.
3Reliability
If motorized beam steering methods are used, then beam steering capability is achieved, but power consumption increases
Solution Approach 1:
The patent replaces power-hungry motorized mechanical systems with low-power electronic phase control. The phased array system uses digital signal processing and voltage-controlled phase shifters that consume minimal power compared to motors, gears, and mechanical actuators. This substitution significantly reduces overall system power consumption while maintaining reliable beam steering capability through electronic control.
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 achieves efficient beam steering with improved image acquisition speed, reduced size and weight, and enhanced reliability, while minimizing sidelobes and reflections.
Implementation Method 1
The one bit phase shifter is configured to either shift the phase of the incoming signal by 90° or 270°, depending on the value of the phase state
Implementation Method 2
Each antenna element includes a patch antenna
Implementation Method 3
The interface of the semiconductor device is designed to allow a plurality of these semiconductor devices to be mounted as an array on a printed circuit board
Data Source
AI summary
A terahertz imaging system is disclosed. The terahertz imaging system includes a terahertz antenna array, made up of a plurality of antenna elements. Each antenna element includes a patch antenna, a one bit phase shifter, and a plurality of storage elements. The storage elements are used to store a plurality of phase states that are supplied to the one bit phase shifter. The one bit phase shifter is configured to either shift the phase of the incoming signal by 90 or 270, depending on the value of the phase state. The one bit phase shifter is also bidirectional, allowing it to phase shift transmitted signals and reflected signals. A plurality of these antenna elements are disposed in a semiconductor device, where the top metal layer is exposed. This top metal layer is used to create the patch antennas.