Dielectric Covered Planar Antennas for Terahertz Arrays
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Solution Overview
Problem
Current antenna designs for terahertz frequencies face challenges in manufacturing large arrays due to broad beam patterns and optical aberrations, requiring additional elements like substrate lenses or micro-machined horns, which complicates the fabrication and assembly of large focal planes for astrophysics and security imaging applications.
Innovation Solution
A dielectric covered planar antenna element featuring an extended spherical semiconductor lens fed by a leaky wave waveguide, which excites TE/TM modes in a resonant cavity, allowing for a directive radiation pattern and enabling the production of large format imaging arrays using photolithographic techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional planar antenna designs are used, then manufacturing is simplified, but beam patterns become broad requiring additional coupling elements
Solution Approach 1:
The patent combines the planar antenna structure with a three-dimensional lens directly integrated on the same substrate. The lens is formed by depositing dielectric material and reflowing it to create a spherical cap shape, merging the radiation element and focusing element into a single integrated structure, thereby eliminating the need for separate coupling horns or lenses while maintaining narrow beam patterns.
Solution Approach 2:
The patent transitions from a two-dimensional planar antenna design to a three-dimensional structure by adding a spherical cap lens on top of the planar radiating element. This dimensional enhancement allows the antenna to achieve directional beam patterns typically requiring separate coupling elements, while still maintaining planar fabrication compatibility through vertical material deposition and reflow processes.
2Device complexity
If substrate lenses or micro-machined horns are added for efficient coupling, then beam directionality is improved, but fabrication and assembly complexity increases
Solution Approach 1:
The patent merges the substrate lens function directly into the antenna structure by forming a spherical cap of dielectric material on the radiating element. This integration eliminates the need for separate lens components and their associated alignment and assembly procedures, simplifying manufacturing while maintaining the beam directionality control that lenses provide.
Solution Approach 2:
The patent changes the physical state and shape of the dielectric material through thermal reflow processing. By heating the deposited dielectric layer above its glass transition temperature, the material softens and forms a spherical cap shape under surface tension, transforming a flat deposited layer into a three-dimensional lens structure with precise curvature controlled by processing parameters rather than mechanical machining.
3Area of stationary object
If large arrays are assembled from multiple elements, then imaging coverage is improved, but assembly and alignment difficulty increases
Solution Approach 1:
The patent enables the fabrication of large focal planes by segmenting the array into multiple identical antenna elements that can be independently fabricated on separate wafers using photolithography. Each element includes the integrated planar antenna and spherical cap lens, allowing parallel processing and reducing assembly complexity through modular, repeatable units with consistent alignment features.
Solution Approach 2:
The patent creates a universal antenna element design where the same structural configuration serves multiple functions: the planar radiating element provides broadband impedance matching, while the integrated spherical cap lens provides beam directionality. This multi-functional integration simplifies the overall system design and reduces the number of different component types needed for large array assemblies.
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 solution allows for the fabrication of high-frequency antenna arrays with improved directivity and reduced manufacturing complexity, enabling the creation of large format imaging arrays suitable for terahertz frequencies by illuminating only a small sector of the lens, facilitating the integration of multiple antennas on a single wafer.
Implementation Method 1
The antenna element comprises an extended spherical (e.g. hemispherical) semiconductor lens, e.g. silicon, antenna fed by a leaky wave waveguide feed
Implementation Method 2
A couple of TE/TM leaky wave modes are excited in a resonant cavity formed between a ground plane and the substantially planar lens extension by a waveguide block coupled to the ground plane
Implementation Method 3
The extended spherical lens comprises a substantially spherical lens adjacent a substantially planar lens extension. The primary feed radiates inside the lens with a directive pattern that illuminates a small sector of the lens
Data Source
AI summary
An antenna element suitable for integrated arrays at terahertz frequencies is disclosed. The antenna element comprises an extended spherical (e.g. hemispherical) semiconductor lens, e.g. silicon, antenna fed by a leaky wave waveguide feed. The extended spherical lens comprises a substantially spherical lens adjacent a substantially planar lens extension. A couple of TE/TM leaky wave modes are excited in a resonant cavity formed between a ground plane and the substantially planar lens extension by a waveguide block coupled to the ground plane. Due to these modes, the primary feed radiates inside the lens with a directive pattern that illuminates a small sector of the lens. The antenna structure is compatible with known semiconductor fabrication technology and enables production of large format imaging arrays.