Side-Mounted Container Antenna for Protected Satellite Beam Steering
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Solution Overview
Problem
Existing satellite communication antennas for freight containers are typically mounted on the roof, which can be prone to damage and obstructive when stacked, and do not provide optimal beam steering and gain for reliable satellite communication.
Innovation Solution
A side-mounted antenna configuration with a tapered case design to fit into corrugated container door recesses, utilizing a 2×2 patch layout and striplines for upward beam steering and circular polarization, providing improved gain and angular range for satellite communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is mounted on the roof of the container, then it provides a wide view of the sky for satellite communication, but it can be damaged and obstructed by cargo
Solution Approach 1:
The antenna is relocated from the traditional roof-mounted position (horizontal dimension) to the side-mounted position (vertical dimension). This dimensional change allows the antenna to achieve upward beam steering at angles of 30-60 degrees above the horizon, maintaining satellite communication capability while avoiding damage and obstruction risks associated with roof mounting.
2Object-affected harmful factors
If the antenna is mounted on the side of the container, then it protects against damage, but it does not provide sufficient gain and angular beam range for reliable communication
Solution Approach 1:
The antenna design incorporates specific parameter optimizations including a 2×2 patch array configuration, stripline feed network with specific impedance values (50 ohms), and a tapered case structure. These parameter changes enable the side-mounted antenna to achieve gain greater than 0 dBi for 0 to 60 degrees above the horizon, providing sufficient communication reliability while maintaining damage protection benefits.
3Reliability
If the antenna case depth is increased to improve gain, then communication performance improves, but it cannot fit into the limited door recess space
Solution Approach 1:
The antenna is designed with a nested structure where the tapered case fits into the existing door recess of the container. The case depth is optimized to be less than or equal to the recess depth (33 mm), allowing the antenna to be nested within the available space while maintaining adequate gain through the optimized patch array and feed network configuration.
4Object-affected harmful factors
If the antenna is designed with a low profile for protection, then it resists damage, but it limits access for maintenance
Solution Approach 1:
The antenna system is segmented into modular components including the tapered case, patch array, feed network, and mounting hardware. This segmentation allows the antenna to maintain a low-profile integrated design for damage resistance while enabling easy disassembly and reassembly for maintenance purposes, improving accessibility without compromising protection.
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 side-mounted antenna design enhances communication reliability by protecting the antenna from damage and overcoming obstructions, ensuring effective satellite communication during transport and storage, with improved gain and beam steering.
Implementation Method 1
a transmission line layer with striplines configured to set an upward beam steering direction. In some embodiments, the upward beam steering is at least 30 degrees above the horizon
Implementation Method 2
The striplines are further configured to provide circular polarization of transmission
Implementation Method 3
The patch layer and transmission line layer provide an antenna gain greater than 0 dBi for 0 to 60 degrees above the horizon, in an uplink range of at least 1525-1559 MHz, and in a downlink range of at least 1626-1661 MHz
Data Source
AI summary
An antenna is provided for satellite communication configured to be mounted in horizontal corrugated recesses of freight container doors. The antenna case has a front side whose vertical dimension is less than or equal to a front recess gap size of 14.5 cm, tapering to a back side vertical dimension of less than or equal to a back recess length of 7 cm, and a case depth of less than or equal to a recess depth of 3.3 cm. The antenna includes a patch layer and a transmission line layer, wherein the patch layer comprises a 2×2 patch layout, giving antenna gain greater than 0 dBi for 0 to 60 degrees above the horizon.