Dielectric Hollow Antenna High-Temperature Radar Gauging
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Solution Overview
Problem
Conventional dielectric antennas for radar applications do not withstand high temperatures and are affected by installation via small tank nozzles, leading to issues with gain, return loss, and side lobes over the radar bandwidth.
Innovation Solution
A dielectric hollow antenna with a hollow inside tapered rod, a flat section, and a cap, filled with low loss dielectric material like Teflon, featuring a feed through section and metal flange, designed to maximize radiation and minimize reflections, supporting TE01 and TE11 propagation modes, and capable of withstanding high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional dielectric antennas are used, then they provide low cost and radar performance, but they do not withstand high temperatures
Solution Approach 1:
The antenna is divided into two distinct parts: a conventional dielectric rod antenna for radiation and a separate waveguide structure for transmission. This segmentation allows each component to be optimized for its specific function, with the waveguide handling high-temperature transmission while the dielectric rod maintains radar performance characteristics.
Solution Approach 2:
A waveguide acts as an intermediary between the signal source and the dielectric antenna. The waveguide transmits signals through high-temperature environments without degrading, while the dielectric rod antenna performs the actual radiation function, thus protecting the system from thermal damage.
2Ease of operation
If conventional dielectric antennas are installed via small tank nozzles, then installation is possible, but gain, return loss, and side lobes are affected over the radar bandwidth
Solution Approach 1:
By separating the transmission function (waveguide) from the radiation function (dielectric rod), the antenna can be installed through small nozzles via the flexible waveguide section while the rigid dielectric rod portion is positioned optimally for radiation, thus maintaining both installation ease and radiation pattern precision.
Solution Approach 2:
The waveguide can be configured to navigate through the three-dimensional space of the tank nozzle installation path, allowing the antenna system to be installed through small openings while the radiating element maintains its optimal orientation and position for precise radiation patterns.
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 antenna achieves high gain, low return loss, and low side lobes over the radar bandwidth, allowing it to be used in high-temperature applications like radar level gauging with improved reliability and cost-effectiveness.
Implementation Method 1
The waveguide can be designed as a rectangular waveguide that supports a propagation (TE01) mode. The waveguide can then transition to a circular waveguide that supports another propagation (TE11) mode.
Implementation Method 2
A low loss dielectric material (e.g., Teflon, a notoriously well-known PTFE (polytetrafluoroethylene) based material) can fill the hollow rod that protrudes beyond the metal waveguide to form a radiating element.
Implementation Method 3
A dielectric antenna such as a dielectric rod antenna is a surface-wave antenna in which an end-fire radiation pattern is produced by propagation of a surface wave on a tapered dielectric rod.
Data Source
AI summary
A dielectric hollow antenna apparatus includes a hollow inside tapered rod (e.g., a waveguide) with a flat section and a cap. The antenna further includes a feed through section, a feed pin, and a metal flange. A low loss dielectric material fills the hollow rod that protrudes beyond the metal waveguide to form a radiating element. The radiating element is designed in such a way to maximize radiation and minimize reflections over the antenna bandwidth. The feed through section reduces internal reflection and the waveguide is designed to include a rectangular waveguide that support a propagation (TE01) mode and the waveguide then transitions to a circular waveguide that supports another propagation (TE11) mode. The antennas can be employed for radar level gauging and withstand high temperature and possesses a small diameter that permits the antenna to fit in small tank nozzles.