Wafer-Level RF Antenna With Suspended Center Conductor
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Solution Overview
Problem
Conventional antennas for high-frequency communication systems, such as those operating between 10 GHz and 300 GHz, face limitations including low power handling capability and poor impedance match to transceiver circuitry, necessitating additional matching networks for optimization.
Innovation Solution
A method and structure for constructing radio frequency antennas using a dielectric substrate with multiple layers of conductive and sacrificial materials, forming a coaxial transmission line with a shield and center conductor, and an antenna radiating element, where the sacrificial material is dissolved to create clearance spaces, allowing the center conductor to be suspended within the shield, improving impedance matching and power handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin film technology is used for antenna construction, then the manufacturing process is simple, but the power handling capability is low
Solution Approach 1:
The patent transitions from two-dimensional thin film deposition to three-dimensional microstructure fabrication. The coaxial transmission line structure with suspended center conductor creates vertical spacing and air gaps that are not achievable with planar thin film technology, enabling improved power handling while maintaining wafer-level fabrication capabilities
Solution Approach 2:
The patent changes the physical parameters of the antenna structure by creating three-dimensional coaxial geometries with controlled spacing between conductive elements. The air gap distance and conductor dimensions are optimized to simultaneously achieve high power handling capability and resonant frequency tuning, resolving the contradiction between manufacturing simplicity and performance
2Ease of manufacture
If thin film antenna designs are used, then the fabrication process is straightforward, but the impedance match to transceiver circuitry is poor
Solution Approach 1:
The patent applies different material properties and structural characteristics to different regions of the antenna. The coaxial transmission line features varying conductor diameters and spacing at different locations along its length, allowing local impedance control to achieve precise impedance matching to transceiver circuitry while maintaining overall fabrication simplicity through wafer-level processing
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 solution enhances the power handling capability and impedance matching of high-frequency antennas, improving their efficiency and performance by suspending the center conductor within the shield, which is filled with a gaseous dielectric, thereby enhancing the antenna's efficiency compared to traditional thin film designs.
Implementation Method 1
One or more layers of the sacrificial material are subsequently dissolved to form a channel disposed within the shield
Implementation Method 2
the center conductor resides in the channel spaced apart from the walls... filled with a gaseous dielectric
Data Source
AI summary
Method for constructing a dipole radio frequency antenna includes depositing on a dielectric substrate at least one layer each of a conductive material, a dielectric material, and a sacrificial material. The deposit of conductive material is controlled to form a transmission line, antenna radiating element and associated antenna feed. The transmission line includes a shield formed of one or more walls and a center conductor disposed coaxially within the shield. An antenna feed portion is electrically connected to the center conductor and extends through a feed port on the transmission line to connect with an antenna radiating element. The radiating element has an elongated form which extends a first predetermined length transverse to an axis of the transmission line. The method also includes dissolving at least one layer of the sacrificial material to form a clearance space between the surface of the dielectric substrate and the antenna radiating element.