Terahertz Mobile Communication Antennas Without Beamforming
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Solution Overview
Problem
Current network capacity cannot accommodate the increasing traffic demand on roads and railroad tracks due to the widespread use of connected cars and smart trains, and radio waves in millimeter and terahertz bands face challenges in expanding coverage distance and maintaining communication quality due to high propagation attenuation and the complexity of beamforming.
Innovation Solution
A communication system where the mobile object and base station perform mobile communication with antenna gains proportional to the cosecant squared of the elevation/depression angle, using terahertz band radio waves, to expand coverage distance and stabilize communication quality without beamforming, employing cosecant directional antennas along roads and railroad tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming is used to expand coverage distance with terahertz band radio waves, then coverage distance can be extended, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent extracts and eliminates the beamforming function from the system, replacing it with cosecant directional antennas that inherently provide the necessary radiation pattern. This removes the complex signal processing and control mechanisms required for beamforming while achieving the same coverage extension goal through antenna design alone.
Solution Approach 2:
The patent employs simpler, more cost-effective cosecant directional antennas instead of complex beamforming systems. These antennas provide the required radiation characteristics through their physical design rather than through complex electronic control, reducing both device complexity and power consumption while maintaining coverage distance.
2Reliability
If beamforming is implemented to maintain communication quality over long distances, then communication quality improves, but power consumption increases
Solution Approach 1:
The patent removes the power-intensive beamforming operation from the system and replaces it with passive cosecant directional antennas that achieve the same communication quality maintenance through their inherent radiation pattern, significantly reducing power consumption while preserving reliability.
Solution Approach 2:
The cosecant directional antennas self-adjust their radiation pattern according to the elevation angle automatically, eliminating the need for active beamforming control and power consumption. The antenna design inherently provides the necessary signal strength variation with elevation angle to maintain communication quality over varying distances.
3Length of stationary object
If conventional antennas are used with terahertz band radio waves, then system simplicity is maintained, but coverage distance is limited due to high propagation attenuation
Solution Approach 1:
The patent changes the radiation pattern parameter of the antenna from conventional omnidirectional or simple directional patterns to a cosecant squared radiation pattern. This parameter change in the antenna's electromagnetic radiation characteristics allows the system to compensate for terahertz band propagation attenuation, extending coverage distance without adding complex control mechanisms.
4Reliability
If conventional antennas are used, then device complexity is low, but communication quality becomes unstable due to elevation angle variations
Solution Approach 1:
The patent modifies the antenna gain parameter as a function of elevation angle, implementing a cosecant squared radiation pattern. This parameter change ensures that the antenna gain automatically compensates for signal attenuation at different elevation angles, stabilizing communication quality without requiring active control mechanisms or increased device complexity.
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 system achieves expanded coverage distance up to 200 meters, stabilizes communication quality, and enables seamless and high-velocity data communication with low-cost, compact base stations, reducing interference and power consumption.
Implementation Method 1
a product of an antenna gain of a communication antenna on a transmitting end and an antenna gain of a communication antenna on a receiving end in mobile communication using a radio wave with a frequency in a terahertz band between the mobile object and the first base station is proportional to a cosecant raised to a power of two of an elevation/depression angle
Data Source
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AI summary
[Solution] Provided is a communication system, comprising: a mobile object; and a first base station, wherein the mobile object and the first base station performs mobile communication in such a manner that a product of an antenna gain of a communication antenna on a transmitting end and an antenna gain of a communication antenna on a receiving end in mobile communication using a radio wave with a frequency in a terahertz band between the mobile object and the first base station is proportional to a cosecant raised to a power of two of an elevation/depression angle of the radio wave in a propagation direction, and a mobile object, comprising: a communication antenna used for mobile communication between the mobile object and a base station; and a communication unit that performs mobile communication with the base station by using the communication antenna included in the mobile object in such a manner that a product of an antenna gain of a communication antenna on a transmitting end and an antenna gain of a communication antenna on a receiving end in mobile communication using a radio wave with a frequency in a terahertz band between the mobile object and the base station is proportional to a cosecant raised to a power of two of an elevation/depression angle of the radio wave in a propagation direction. Selected drawing: Fig. 1