Terahertz Device Impedance Matching via Transmission Lines
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Solution Overview
Problem
Existing THz devices face challenges in achieving high-efficiency matching between active elements and antennas, which hampers the transmitting and receiving efficiency in phase modulation, synchronous detection, and modulation/demodulation of THz signals.
Innovation Solution
The implementation of a THz device and integrated circuit design that utilizes impedance conversion effects of transmission lines to achieve high-efficiency matching between antennas and active elements, incorporating features like low-pass filters and specific antenna structures such as bow tie and dipole antennas, along with resonator units and mixer units for improved signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct connection between antenna and active element is used, then device structure is simple, but impedance matching efficiency is poor
Solution Approach 1:
The patent introduces transmission lines as intermediary components between the antenna and active element. These transmission lines serve as impedance transformation mediators, converting the impedance levels to achieve efficient power transfer and signal transmission, thereby resolving the impedance mismatch problem without requiring complex matching networks.
Solution Approach 2:
The patent utilizes the characteristic impedance parameters of transmission lines to transform impedance levels. By carefully selecting transmission line dimensions, materials, and electrical lengths, the system achieves impedance matching through parameter optimization rather than structural complexity, enabling efficient THz signal transmission.
2Productivity
If impedance matching is improved using transmission lines, then transmitting and receiving efficiency is enhanced, but device complexity increases
Solution Approach 1:
The transmission lines in the patent serve multiple functions simultaneously: they act as signal transmission paths, impedance transformation elements, and electromagnetic field guides. This multi-functionality allows the system to achieve improved transmitting and receiving efficiency without proportionally increasing device complexity, as the same structural elements perform multiple critical roles.
3Measurement precision
If low-pass filters are added to the resonator unit, then signal processing quality is improved, but device complexity increases
Solution Approach 1:
The patent extracts and separates the filtering function into a dedicated low-pass filter component within the resonator unit. This extracted filter selectively removes high-frequency noise and unwanted harmonics while preserving the desired THz signal, thereby improving signal processing quality. The filter is designed with optimized parameters to achieve effective signal separation without excessive structural complexity.
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
This design enhances the transmitting and receiving efficiency of THz signals, particularly in phase modulation and synchronous detection, by ensuring effective impedance matching, thereby improving the overall performance of THz devices and integrated circuits.
Implementation Method 1
impedance matching of between the antenna and the active element is performed by an impedance conversion of the first transmission lines
Implementation Method 2
a low-pass filter with respect to the THz wave, the low-pass filter connected to the pad electrodes
Implementation Method 3
an antenna capable of transmitting and receiving a THz wave to free space
Data Source
AI summary
A THz device includes: an antenna electrode capable of transmitting and receiving a THz wave to free space; first transmission lines capable of transmitting the THz wave, the first transmission lines respectively connected to the antenna electrodes; an active element of which a main electrode is connected to each of the first transmission lines; second transmission lines capable of transmitting the THz wave, the second transmission lines connected to the first active device; pad electrodes respectively connected to the second transmission lines; and a low-pass filter with respect to the THz wave, the low-pass filter connected to the pad electrodes, wherein impedance matching of between the antenna electrode and the active element is performed by an impedance conversion of the first transmission lines. The THz device is capable of the high-efficiency matching between the active element and the antenna due to the impedance conversion effect of the transmission line.