THz Beam Generation Using Segmented CMOS Unit Cells
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Solution Overview
Problem
Current THz wireless communication and sensing technologies face challenges due to the lack of affordable and efficient THz devices, with CMOS-based THz integrated circuits operating above their cut-off frequency, resulting in low radiated output power and difficulties in beam steering and shaping.
Innovation Solution
A device comprising an array of independent unit cells, each with RF sources generating THz signals and antennas for transmitting these signals, along with switches and circuitry for controlling the activation of each unit cell to generate and shape a coherent RF beam. This device also includes an injection-locking source to enhance signal coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If CMOS-based THz integrated circuits operate above their cut-off frequency, then data transmission capability is improved, but radiated output power deteriorates
Solution Approach 1:
The system divides the THz signal generation into multiple independent unit cells, each operating at a lower frequency below the CMOS cut-off. By segmenting the overall THz bandwidth into multiple sub-bands and using parallel unit cells, the system achieves effective THz transmission capability while each individual cell operates within the efficient power radiation range of CMOS devices.
Solution Approach 2:
Multiple unit cells operating at lower frequencies are combined through coherent signal integration to produce an effective THz signal. The merging of signals from multiple cells operating below cut-off frequency achieves the desired high-frequency transmission capability while maintaining efficient power radiation from each individual cell.
2Adaptability or versatility
If phased arrays are used for beam steering and shaping in THz band, then beam control capability is improved, but device complexity deteriorates due to absence of efficient THz devices
Solution Approach 1:
The phased array is divided into multiple independent unit cells that can be individually controlled. Each unit cell contains its own RF sources and antennas, allowing independent phase and amplitude control. This segmentation enables beam steering and shaping functionality while using simpler, more integrated circuitry at each unit cell level, avoiding the need for complex external THz phase shifters and amplifiers.
Solution Approach 2:
Each unit cell is designed as a multi-functional module that can perform signal generation, phase control, and radiation functions. The unit cells can be selectively activated and configured for different beam patterns, providing universal beam control capability across multiple operating modes without requiring separate dedicated components for each function.
3Productivity
If compound semiconductor devices are used for THz systems, then THz signal generation capability is improved, but cost and size deteriorate
Solution Approach 1:
The patent replaces mechanical compound semiconductor devices with integrated circuit-based THz signal generation using CMOS technology. By substituting discrete component assemblies with integrated circuits, the system achieves comparable THz signal generation capability while dramatically reducing device size, integration density, and manufacturing cost.
Solution Approach 2:
The system changes the operating parameters of CMOS devices to enable THz frequency operation. By carefully designing the unit cells to operate at optimized frequencies and using techniques such as harmonic generation and signal combining, the patent achieves effective THz signal generation using standard CMOS processes, avoiding the need for expensive compound semiconductor materials and extreme operating conditions.
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
Enables the development of low-cost, high-density THz power-generating integrated circuits and systems, allowing for efficient on-chip generation and programming of THz beams for coherent communication and sensing applications.
Implementation Method 1
one or more antennas coupled to the one or more RF sources for transmitting THz waves based on the one or more THz signals
Implementation Method 2
switches configured to selectively bias each unit cell between: an activated state in which the one or more antennas of the unit cell are operable to transmit the THz waves; and a deactivated state in which the one or more antennas of the unit cell are prevented from transmitting the THz waves
Implementation Method 3
an injection-locking source configured to transmit an injection-locking signal to the array for assisting the one or more THz signals generated by the one or more RF sources of each unit cell in the activated state to be coherent with the one or more THz signals generated by the one or more RF sources of each other unit cell in the activated state
Data Source
AI summary
A device for generating a radio frequency (RF) beam includes an array of independent unit cells. Each unit cell includes RF sources configured to generate terahertz (THz) signals, and antennas coupled to the RF sources for transmitting THz waves based on the THz signals. The device further includes switches configured to selectively bias each unit cell between an activated state in which the antennas of the unit cell are operable to transmit the THz waves, and a deactivated state in which the antennas of the unit cell are prevented from transmitting the THz waves. The device further includes circuitry configured to control the switches to generate the RF beam based on the THz waves transmitted by the antennas of each unit cell in the activated state.