Precision Waveguide Interface for Millimeter Wave Coupling
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Solution Overview
Problem
Current methods for coupling millimeter wave energy between semiconductor devices and waveguides are costly and inefficient, particularly for differential circuit configurations, due to the need for precise machining and the use of lossy balun transformers.
Innovation Solution
A precision waveguide interface is developed, featuring a circular interface plate with a rectangular slot that constrains the waveguide cutoff frequency, allowing only electrical energy to pass through, and a launch transducer with low-loss dielectric material and metallization, enabling efficient energy transfer from a printed circuit board to a standard waveguide flange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If split-cavity metallic structures with precision machining are used to couple millimeter wave energy, then energy transfer efficiency is improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The waveguide interface is divided into separate modular components: a waveguide component with flange and a circuit board assembly with launch transducer. These modules can be manufactured independently using standard processes and assembled together, eliminating the need for expensive precision machining of monolithic structures while maintaining energy transfer efficiency through proper electromagnetic coupling design.
Solution Approach 2:
A launch transducer serving as an intermediary element couples energy between the circuit board and waveguide. This transducer includes a radiating element that efficiently transfers millimeter wave energy without requiring precision-machined split-cavity structures, thereby reducing manufacturing costs while maintaining energy transfer efficiency.
2Adaptability or versatility
If balun transformers are used to couple energy from balanced transmission line outputs to waveguide, then coupling capability is improved, but energy losses increase at higher frequencies
Solution Approach 1:
The invention extracts and eliminates the balun transformer from the coupling path by directly integrating a launch transducer onto the circuit board that can couple balanced transmission line outputs directly to the waveguide. This removal of the intermediate balun component eliminates the excessive losses that occur in baluns at millimeter wave frequencies while maintaining coupling capability.
Solution Approach 2:
The launch transducer combines the functions of the balun transformer and waveguide coupling element into a single integrated structure. This merged component directly couples balanced transmission line outputs to the waveguide without requiring a separate balun stage, thereby eliminating excessive losses at millimeter wave frequencies while maintaining coupling capability.
3Device complexity
If orthogonal planar printed circuit launch probe is used for energy coupling, then device complexity is reduced, but energy transfer efficiency deteriorates due to lossy energy transfer
Solution Approach 1:
The launch transducer employs a radiating element with optimized geometry and positioning that dynamically adapts to the electromagnetic field distribution between the circuit board and waveguide. This dynamic field coupling approach achieves low-loss energy transfer without requiring complex precision-machined structures, thereby maintaining low device complexity while improving energy transfer efficiency.
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 provides a low-cost, high-efficiency coupling method for both single-ended and differential circuits, reducing energy losses and eliminating the need for expensive precision machining, while maintaining alignment and interoperability with standardized waveguide structures.
Implementation Method 1
the distance from the printed circuit assembly to the slot width upper boundary constrains the waveguide cutoff frequency of the short waveguide segment such that it is greater than the desired overall operational frequency range of the waveguide interface
Implementation Method 2
a launch transducer with low-loss dielectric material and metallization, enabling efficient energy transfer from a printed circuit board to a standard waveguide flange
Data Source
Figure 1A~3A
Figure 1B~3B
Figure 2B~4C
AI summary
A waveguide interface and method of manufacturing. The interface includes a support block that has a printed circuit board. A communication device is coupled to the circuit board. A launch transducer is positioned adjacent to and coupled to the communication device. The launch transducer includes one or more transmission lines in a first portion and at least one antenna element in a second portion. The antenna element radiates millimeter wave frequency signals. An interface plate coupled to the support block has a rectangular slot having predetermined dimensions. A waveguide component is coupled to the interface plate and has a waveguide opening. The first portion of the launch transducer is positioned within the slot such that the slot prevents energy from the transmission line from emitting toward the circuit board or the waveguide opening but allows energy to pass from the antenna element into the waveguide opening.