Gas-Filled Waveguide Reference for Low-Loss Frequency Stability
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Solution Overview
Problem
Existing frequency-reference devices that utilize quartz-crystals or microelectromechanical oscillators suffer from frequency drift, and devices using rotational transitions of polar gas molecules face challenges in achieving both hermeticity and efficient high-frequency signal transmission.
Innovation Solution
The solution involves enclosing both the waveguide and a part of the transmission and receiver electronics in a sealed enclosure filled with gas, eliminating the need for hermetic sealing between the waveguide and the electronics, thereby allowing for low-loss signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hermetic sealing elements are used to seal the waveguide for gas confinement, then gas confinement is achieved, but signal transmission losses increase and sensitivity decreases
Solution Approach 1:
The patent merges the waveguide interior with the sealing enclosure by removing the hermetic seal at the waveguide end and instead sealing the entire enclosure containing both the waveguide and electronics. This eliminates the need for signal to pass through hermetic sealing elements, reducing signal losses while maintaining gas confinement within the sealed enclosure.
Solution Approach 2:
The patent extracts the hermetic sealing requirement from the waveguide interface and relocates it to the enclosure level. By taking out the hermetic sealant from the signal path and placing it only at the enclosure boundaries, the solution maintains gas confinement while eliminating signal transmission losses through seals.
2Reliability
If hermetic sealants are used to connect transmitter and receiver electronics to the waveguide, then gas confinement is maintained, but device complexity and cost increase
Solution Approach 1:
The patent combines the waveguide structure with the sealing enclosure by making the waveguide end open to the enclosure interior. This merging eliminates the need for separate hermetic sealing arrangements at the waveguide interface, reducing device complexity and cost while maintaining gas confinement through the enclosure seal.
Solution Approach 2:
The enclosure serves multiple functions: it provides structural housing, contains the gas environment, and provides the hermetic seal. This multi-functionality eliminates the need for separate dedicated sealing components at the waveguide interface, simplifying the overall device structure.
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 arrangement reduces signal losses and maintains long-term frequency stability, achieving low-cost and high-stability frequency-reference devices.
Implementation Method 1
The gas molecules exhibit a rotational energy transition at sub THz and THz frequencies. Rotational spectral lines have a high-quality factor and strong absorption intensity. Thus part of the energy of the electromagnetic probing signal will be absorbed by the gas at the transition frequencies.
Data Source
AI summary
A frequency reference device comprising a waveguide with a first end and a second end, a signal transmitter module for generating a high-frequency electromagnetic wave in the waveguide, and a signal receiver module for receiving the high-frequency electromagnetic wave in the waveguide. The component comprises a sealed enclosure, and said sealed enclosure is filled with a gas. The waveguide, first and second radiation coupling probes and the signal transmitter module and the signal receiver module are all located within said scaled enclosure.