Near-Field Transmission Coupler for Flooded Utility Meter Housings
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Solution Overview
Problem
Utility meters installed in humid environments face inefficiencies in radio communication due to galvanic connectors, which can lead to water intrusion, and existing non-galvanic couplers are affected by varying electromagnetic properties of surrounding media, causing coupling loss and instability.
Innovation Solution
A transmission coupler with a displacement element that occupies a volume near the coupling antenna, displacing surrounding media to maintain a stable electromagnetic environment, ensuring efficient near-field coupling despite varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a galvanic radio frequency connector is used to connect an external antenna to the transceiver, then efficient transfer of radio signals is achieved, but water may enter the utility meter housing through the connector
Solution Approach 1:
A non-galvanic transmission coupler is introduced as an intermediary device between the internal antenna and external antenna. The coupler uses capacitive coupling through the housing wall rather than direct galvanic connection, eliminating the water intrusion risk while maintaining signal transfer capability. The transmission line connects the coupler to the external antenna without penetrating the housing seal.
2Reliability
If a non-galvanic transmission coupler is used to avoid water intrusion, then housing seal integrity is maintained, but coupling efficiency is reduced due to water or dirt surrounding the coupler
Solution Approach 1:
The displacement element changes the electromagnetic parameters (permittivity and permeability) in the region surrounding the coupling antenna. By displacing water or dirt with air or vacuum, the element optimizes the electromagnetic environment for capacitive coupling, maintaining resonant frequency and impedance matching despite external environmental conditions.
Solution Approach 2:
The displacement element acts as an intermediary between the transmission coupler and the external environment (water/dirt). It creates a protective electromagnetic interface that isolates the coupling mechanism from harmful environmental factors while allowing the capacitive coupling function to operate efficiently.
3Adaptability or versatility
If the transmission coupler is surrounded by water or dirt instead of air, then the medium changes, but the resonance and impedance of the coupler are modified causing coupling loss
Solution Approach 1:
The displacement element dynamically or statically changes the electromagnetic parameters in the coupler's immediate vicinity. By maintaining a consistent medium (air or vacuum) around the coupling antenna regardless of external conditions, the resonant frequency and impedance remain stable, preventing coupling loss and ensuring reliable operation in flooded or dirty environments.
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 coupler provides stable and efficient radio signal transmission by reducing the influence of surrounding media on resonance and impedance, maintaining consistent communication performance even in flooded or dirty conditions.
Implementation Method 1
a near field coupling is provided between the meter antenna and the coupling antenna through the meter housing
Implementation Method 2
The resonance / impedance of the coupler is modified by the changing medium around the coupler whereby the efficiency of the near field coupling between the transmission coupler and the internal antenna is impaired
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The present disclosure refers to a transmission coupler for receiving radio signals carrying consumption data from a utility meter. The utility meter comprises a meter housing wherein a radio frequency transmitter circuit and a meter antenna is arranged. The transmission coupler comprises a coupling antenna, a transmission line or a radio frequency connector for connection of a transmission line and a mechanical connection element. The mechanical connection element is arranged for mechanically connection of the transmission coupler to an outer surface of the meter housing whereby a near field coupling is provided between the meter antenna and the coupling antenna through the meter housing. The transmission line or radio frequency connector is electrically connected to the coupling antenna. The transmission coupler further comprises a displacement element arranged to occupy a volume in the proximity of the coupling antenna, whereby a volume of a medium surrounding the transmission coupler is displaced away from the coupling antenna by the displacement element, such that the influence on the near field coupling by the medium surrounding the coupling antenna is reduced.