Direct Waveguide-to-Chip Transition Using Ground Plane Reflection
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Solution Overview
Problem
Current chip-to-waveguide transitions experience significant connection losses and occupy considerable IC and PCB area, especially at millimeter wavelength and terahertz frequencies, due to the use of transmission lines which complicate mass production and reduce efficiency.
Innovation Solution
A substrate assembly with an integrated circuit and antenna is positioned within a waveguide cavity, where a ground plane is aligned with the waveguide walls to reduce the aperture area and reflect electromagnetic radiation back into the cavity, minimizing losses and allowing direct electromagnetic transmission between the IC and waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission line is used to connect the IC to the waveguide, then the connection is established, but connection losses increase and the occupied area increases
Solution Approach 1:
The patent extracts and eliminates the transmission line from the system by implementing a direct connection between the IC and waveguide. The IC is mounted directly on the waveguide aperture, removing the intermediate transmission line component that causes energy losses and occupies space.
Solution Approach 2:
The patent merges the IC mounting substrate with the waveguide structure itself. The IC is directly mounted on the waveguide aperture, combining what were previously separate components (IC, transmission line, waveguide) into an integrated assembly, thereby eliminating connection losses and reducing occupied area.
2Reliability
If a transmission line is used to connect the IC to the waveguide, then the connection is established, but the occupied IC and PCB area increases
Solution Approach 1:
The transmission line is extracted and removed from the system. By eliminating this intermediate component, the patent significantly reduces the area occupied on both the IC and PCB, as the direct mounting approach requires minimal space compared to routing a transmission line.
Solution Approach 2:
The patent transitions from a planar routing approach (transmission line on PCB) to a three-dimensional direct mounting approach. The IC is mounted directly on the waveguide aperture in the Z-dimension, eliminating the need for lateral routing and reducing the footprint on the PCB plane.
3Loss of energy
If the aperture area is reduced with a ground plane, then electromagnetic radiation is reflected back into the cavity, but the aperture area is reduced
Solution Approach 1:
The patent converts what would be harmful radiated energy escaping through the aperture into beneficial reflected energy by introducing a ground plane. The ground plane reflects the electromagnetic radiation back into the waveguide cavity, turning potential energy loss into useful energy that remains confined within the system.
Solution Approach 2:
The ground plane acts as an intermediary element between the IC and the external environment. It mediates the electromagnetic field by reflecting radiation back into the cavity, preventing direct escape of energy while maintaining the electrical connection and signal integrity between the IC and waveguide.
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 configuration significantly reduces transmission losses and simplifies production by confining electromagnetic radiation within the waveguide, improving efficiency and compactness, suitable for applications in communication, radar, and imaging systems.
Implementation Method 1
The ground plane is located across the aperture to reduce the area of the aperture and to reflect some of the electromagnetic radiation transmitted from the antenna directed to the aperture back into the cavity
Implementation Method 2
The waveguide may confine the wave to propagate in one dimension, allowing, under ideal conditions, that the wave does not lose power when propagating
Data Source
AI summary
An assembly for confining electromagnetic radiation in a waveguide. The assembly comprises a waveguide, comprising walls surrounding a cavity and an aperture in the walls that opens to the cavity, and a substrate assembly disposed in the aperture. The substrate assembly comprises a substrate comprising an antenna, wherein the antenna is located within the cavity and is configured for transmission of radiation within the cavity. The substrate assembly comprises an integrated circuit (IC) electrically connected to the substrate, where the IC comprises semi-conductor components and a ground plane on one side of the IC. The ground plane is located between the IC semi-conductor components and the antenna. The ground plane is located across the aperture to reduce the area of the aperture and to reflect some of the radiation directed to the aperture back into the cavity.