Distributed Active Radiator for Terahertz Power Scalability
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Solution Overview
Problem
Conventional methods for generating high-frequency signals in the terahertz range face challenges such as low power scalability and inefficient electromagnetic radiation from silicon-based ICs, limiting their application in fields like security, defense, and wireless communication due to parasitic scaling and leaky substrate modes.
Innovation Solution
The development of an integrated distributed active radiator (DAR) device that efficiently radiates electromagnetic energy at harmonic frequencies by using a Möbius-like structure with active elements to generate self-oscillation currents, canceling fundamental frequency radiation and enhancing harmonic frequency radiation, thereby overcoming power and efficiency limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional methods (varactors, nonlinear transmission lines, push-push oscillators) are used for signal generation above transistor cut-off frequencies, then signal generation is achieved, but power scalability is limited due to parasitic scaling and modeling inaccuracies
Solution Approach 1:
The invention segments the signal generation process into multiple distributed active radiator elements that can be independently controlled and combined. Each element operates at a lower frequency where transistor performance is reliable, and the segments are combined to achieve high-frequency signal generation with improved power scalability and reduced parasitic effects.
Solution Approach 2:
The invention transitions from conventional planar antenna structures to a three-dimensional distributed array of active radiator elements. This dimensional change enables better control over parasitic effects and improves power scalability by distributing the generation process across multiple spatial locations rather than relying on a single high-frequency source.
2Power
If traditional antennas (e.g., integrated dipole in silicon) are used for radiation, then electromagnetic radiation is achieved, but radiation efficiency is reduced due to leaky substrate modes requiring off-chip structures
Solution Approach 1:
The invention merges the antenna radiation function with the active signal generation function by integrating active elements directly into the radiator structure. This combination eliminates the need for separate off-chip structures to address substrate mode issues, as the active elements are strategically positioned to cancel leaky modes while radiating efficiently.
Solution Approach 2:
The invention converts the harmful leaky substrate modes into beneficial canceling fields by positioning active elements to generate out-of-phase signals that destructively interfere with the leaky modes. This transforms the problematic substrate coupling into a mechanism for improving radiation efficiency and directing energy into free-space radiation.
3Ease of manufacture
If conventional integrated dipole antennas are used in silicon, then radiation is achieved, but additional off-chip structures (dielectric lenses) are required to remedy substrate mode issues
Solution Approach 1:
The invention creates a multi-functional integrated structure where active elements serve dual purposes: generating the signal and canceling substrate modes simultaneously. This universal approach eliminates the need for separate remedial structures like dielectric lenses, achieving both signal generation and substrate mode cancellation within a single integrated device.
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 DAR device achieves three orders of magnitude higher radiated power at terahertz frequencies, providing a low-cost, high-power, and stable sub-THz/THz integrated source that operates at room temperature, with improved radiation efficiency and reduced substrate mode coupling.
Implementation Method 1
At least one active element is electrically connected between the first conductor and the second conductor. The at least one active element is configured to produce a self-oscillation current at a frequency f0
Implementation Method 2
The at least one active element is configured to generate a harmonic current having a harmonic frequency. The harmonic current has a same direction in the first conductor and in the second conductor
Implementation Method 3
The integrated distributed active radiator device is configured to efficiently radiate electromagnetic energy from the aperture at the harmonic frequency and to substantially inhibit the radiation of electromagnetic energy at the frequency f0
Data Source
AI summary
An integrated distributed active radiator (DAR) device includes first and second conductors disposed adjacent to each other. The conductors define curves which close on themselves to within a distance of a gap. The first conductor first end is electrically coupled to the second conductor second end across the gap. The second conductor first end is electrically coupled to the first conductor second end across the gap. At least one active element is configured to produce a self-oscillation current at a frequency f0. The self-oscillation current has a first direction in the first conductor and a second direction in the second conductor. The DAR device is configured to generate a harmonic current which has the same direction in both conductors. The DAR device is configured to efficiently radiate electromagnetic energy at a harmonic frequency and to substantially inhibit the radiation of electromagnetic energy at the frequency f0.