Integrated THz Couplers for Helical Slow-Wave Structures

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Solution Overview

Problem

Current self-assembled conductive helices (SACHs) face challenges in reliably integrating couplers for THz radiation, requiring scalable processes for efficient transmission and reception.

Innovation Solution

Integrate coaxial horn antennas on the same wafer as self-assembled conductive helices, achieving vertical integration with sub-micrometer tolerances and scalable processes, allowing reliable coupling of THz radiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If self-assembled conductive helices are used as slow-wave structures, then they enable THz frequency operation, but reliable integration of couplers for THz radiation is challenging

Engineering Contradiction:

Improveintegration reliability of THz couplersVSAvoidintegration complexity of couplers

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates the coupler and SACH structures into a single unified device fabricated on the same wafer, eliminating separate assembly steps and improving integration reliability while reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent transitions from lateral integration to vertical integration by stacking the coupler and SACH structures in the vertical dimension, enabling sub-micrometer tolerances and scalable fabrication processes

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If laterally integrated couplers are used with SACHs, then coupling is achieved, but the design is less compact

Engineering Contradiction:

Improvedevice compactnessVSAvoidfabrication scalability

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The patent employs vertical integration in the third dimension, stacking coupler and SACH structures vertically to achieve compact footprint while maintaining scalability through standard semiconductor fabrication processes

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Manufacturing precision

If vertical integration with sub-micrometer tolerances is achieved, then compact design is realized, but fabrication precision requirements increase

Engineering Contradiction:

Improvevertical alignment precisionVSAvoidfabrication difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent incorporates alignment marks and positioning features during the initial fabrication stages, enabling subsequent vertical stacking to achieve sub-micrometer tolerances through standard photolithography and etching processes

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The fabrication process uses self-aligned steps where previously formed structures serve as alignment references for subsequent layers, automatically achieving sub-micrometer precision without additional alignment complexity

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12456813B2Helical slow-wave structures with integrated couplers of THz radiation: devices and methods of fabrication

Publication Date: 2025.10.28 WISCONSIN ALUMNI RES FOUND

AI summary

An antenna comprising: input and output coaxial horn antennas coupled with a self-assembled helical slow-wave structure cradled in a groove in a silicon-on-insulator wafer.