Terahertz Mobile Communication Antennas for Beamforming-Free Coverage
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Solution Overview
Problem
Current network capacity cannot accommodate the increasing traffic demand 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 due to high propagation attenuation, while beamforming requires significant hardware and operational complexity.
Innovation Solution
A communication system where the product of antenna gains on the transmitting and receiving ends is proportional to the cosecant squared of the elevation/depression angle of radio waves, using cosecant directional antennas to expand coverage without beamforming, allowing seamless and high-velocity data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming is used to expand coverage distance with millimeter wave and terahertz radio waves, then coverage distance is improved, but device complexity and hardware requirements significantly increase
Solution Approach 1:
The patent extracts the beamforming function from the hardware system and replaces it with a software-based approach using cosecant directional antennas. Instead of using complex phased array hardware to achieve directional transmission, the system uses conventional antennas with specific radiation patterns combined with digital signal processing to achieve the same coverage extension effect, thereby removing the complex hardware requirements while maintaining the coverage distance improvement
Solution Approach 2:
The patent changes the antenna radiation pattern parameter to follow a cosecant directional pattern. By designing antennas with specific elevation angle characteristics where the gain varies as 1/sin(θ), the system achieves optimal coverage along the ground without requiring beamforming hardware. This parameter change in the antenna radiation pattern allows coverage distance expansion while avoiding increased device complexity
2Productivity
If millimeter wave and terahertz radio waves are used to increase network capacity, then network capacity is improved, but propagation attenuation increases causing reduced coverage distance
Solution Approach 1:
The patent applies local quality by creating a non-uniform radiation pattern where the antenna gain is specifically optimized for horizontal directions (along the ground) while reducing gain in other directions. The cosecant directional pattern provides higher gain in the horizontal plane compared to omnidirectional antennas, locally enhancing the signal strength in the direction where coverage is needed most, thereby compensating for the high propagation attenuation of terahertz waves and extending coverage distance while maintaining high network capacity
3Device complexity
If conventional omnidirectional antennas are used, then hardware complexity is reduced, but coverage distance along the ground is insufficient
Solution Approach 1:
The patent changes the radiation pattern parameter from omnidirectional to cosecant directional. By designing antennas where the gain G(θ) is proportional to 1/sin(θ), the system achieves directionally optimized radiation that concentrates energy along the ground. This parameter change in the antenna characteristics extends coverage distance while keeping hardware complexity low, as it uses conventional antenna structures with modified radiation patterns rather than complex phased array systems
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 and stabilized communication quality using terahertz radio waves, reducing hardware complexity and cost, while ensuring seamless data communication as mobile objects move between coverage areas.
Implementation Method 1
a radio wave with a frequency in a terahertz band, which experiences high propagation attenuation
Implementation Method 2
an antenna gain of a communication antenna on a transmitting end and an antenna gain of a communication antenna on a receiving end
Data Source
AI summary
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.