Waveguide Pin Launch Interface for MMIC Signal Loss Reduction
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Solution Overview
Problem
Current interfaces between monolithic microwave integrated circuits (MMICs) and waveguides experience significant signal loss due to lossy materials and impedance mismatches, leading to inefficiencies in microwave energy transmission.
Innovation Solution
A low-loss pin and pin assembly interface is developed, comprising a coaxial structure with a low-loss conductive pin and beads that form a hermetic seal, designed to match impedance between the MMIC and waveguide, reducing signal loss and incorporating commercially available components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If current interfaces with wirebonds, microstrips, and pins are used to connect MMIC to waveguide, then impedance matching is attempted, but signal loss remains unacceptable
Solution Approach 1:
The patent extracts and eliminates the lossy intermediate structures (wirebonds, microstrips, and traditional pins) from the interface between MMIC and waveguide. By removing these problematic components and replacing them with a direct coaxial pin structure, the interface achieves lower signal loss while maintaining impedance matching capability.
Solution Approach 2:
The patent employs a composite structure combining a conductive pin material (such as copper or gold) with a dielectric material (such as Teflon or ceramic) to form a coaxial interface. This composite construction enables simultaneous achievement of low signal loss through the conductive path and proper impedance matching through the dielectric properties, resolving the contradiction between energy loss and interface performance.
2Adaptability or versatility
If impedance matching interfaces are used to connect fifty ohm MMIC to two hundred and seventy ohm waveguide, then impedance transformation is achieved, but signal loss increases
Solution Approach 1:
The patent changes the physical parameters of the transmission path by using a coaxial pin structure with specific dimensions (pin diameter, outer conductor diameter, dielectric constant, and length) to achieve impedance transformation from 50 ohms to 270 ohms. By carefully selecting these parameters, the interface accomplishes impedance matching while minimizing signal loss through optimized electromagnetic field distribution.
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 interface effectively minimizes signal loss across a wide range of frequencies, enhancing the efficiency of microwave energy transmission while maintaining ease of manufacture and cost-effectiveness.
Implementation Method 1
one bead is formed from glass to form a hermetic seal and the interface is connected to the integrated circuit
Data Source
AI summary
in general, in accordance with an exemplary aspect of the present invention, a low-loss interface for connecting an integrated circuit such as a monolithic microwave integrated circuit to an energy transmission device such as a waveguide is disclosed. In one exemplary embodiment, the interface comprises a pin seated within an assembly that forms a hermetic sealed, coaxial structure to prevent signal loss at increasing frequencies.