Solid Dielectric Monopole Antenna Shell for Underground RF Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing underground antennas for automatic meter reading systems are expensive and have suboptimal RF performance due to the use of dielectric gel as a potting material, which introduces manufacturing challenges and degrades signal transmission characteristics.
Innovation Solution
A monopole antenna enclosure made of solid dielectric material, fabricated using injection molding, with a specific design that includes a housing, a disk, a rod, and a wire, ensuring uniform azimuth pattern and hermetic sealing without the use of potting gel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric gel is used as potting material for underground antennas, then the antenna can be encapsulated and protected, but the RF performance characteristics deteriorate and manufacturing costs increase
Solution Approach 1:
The patent changes the physical state parameter of the potting material from gel (liquid/semi-liquid) to solid dielectric material. This parameter change eliminates the harmful effects of gel on RF performance while maintaining the protective encapsulation function. The solid material provides structural support and environmental protection without degrading signal transmission.
Solution Approach 2:
The patent replaces expensive dielectric gel with a more economical solid dielectric material that can be injection molded. This substitution reduces both material costs and manufacturing complexity, making the antenna enclosure more cost-effective while maintaining adequate protection and RF performance.
2Ease of manufacture
If solid dielectric material with thickness exceeding 1/2 inch is injection molded, then the antenna enclosure can be manufactured, but sink marks and voids are created unless the part is allowed to cool entirely in the mold
Solution Approach 1:
The patent divides the thick antenna enclosure into multiple thinner sections or layers during injection molding. By segmenting the thick wall into multiple thinner walls or sections, each section can be properly molded without excessive thickness, avoiding sink marks and voids while maintaining the overall structural integrity and environmental protection of the enclosure.
3Device complexity
If the antenna enclosure is designed for hermetic sealing without potting gel, then manufacturing complexity is reduced, but achieving uniform azimuth pattern becomes more challenging
Solution Approach 1:
The patent applies local quality by creating specific geometric features and internal structures within the solid dielectric enclosure that are optimized for RF signal propagation. Rather than relying on potting gel to achieve uniform azimuth pattern, the design incorporates localized structural elements in the solid enclosure that guide and distribute RF signals uniformly in all directions, maintaining omnidirectional performance without gel.
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 solution provides efficient and cost-effective signal transmission with improved RF performance, uniform radiation pattern, and resistance to environmental variations, while avoiding manufacturing issues associated with dielectric gel.
Implementation Method 1
an antenna enclosure made of solid dielectric material
Implementation Method 2
fabricated using injection molding
Data Source
AI summary
An antenna and antenna enclosure including a housing having a cylindrical first portion defining a hollow interior volume with an inner diameter, a cylindrical second portion defining a hollow interior portion having an inner diameter greater than the inner diameter of the first portion, and a disk disposed inside the second portion and defining a central hole. A rod is disposed in and extends through the central hole of the disk and is captured in the hollow interior volume of the cylindrical first portion. The rod defines a central opening and abuts an inner surface of the disk. A wire is arranged inside the central opening, and a cap covers the hollow interior of the cylindrical portion and engages the housing. A circuit board for the antenna is disposed on underside of the cap and connects to the wire.