Millimeter Wave Antenna Directivity Control for Interference Reduction
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Solution Overview
Problem
Existing wireless communication devices using microwave frequency bands face interference issues due to the lack of directivity in their antennas, leading to inefficient communication and the need for GPS and specific positioning systems, which are not suitable for miniaturized and low-power applications like mobile devices.
Innovation Solution
A wireless communication device utilizing a millimeter wave frequency band with an antenna section having multiple directivities, a direction and position estimation section, and a display section to accurately determine and display the position and direction of target access points, reducing interference by forming directivity in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an antenna with no directivity is used for wireless communication in microwave frequency band, then communication coverage is improved, but communication interference with non-target access points increases
Solution Approach 1:
The patent applies dynamics by making the antenna directivity adjustable rather than fixed. The antenna control section dynamically changes the directivity direction and coverage area based on the target access point's position, allowing the system to adapt between wide coverage for scanning and narrow directivity for focused communication, thereby reducing interference with non-target access points while maintaining communication coverage
Solution Approach 2:
The patent changes the antenna's directivity parameters (direction and coverage angle) based on the position of the target access point. By adjusting these parameters dynamically, the system achieves both wide coverage when needed and focused directional communication to minimize interference, resolving the contradiction between coverage area and interference generation
2Measurement precision
If GPS receiver and positioning system are added to determine access point position, then communication direction accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts only the essential positioning function needed for determining access point direction, eliminating the need for complete GPS receiver and positioning systems. By using simplified positioning means that provide only the necessary directional information, the system achieves position measurement accuracy without the complexity and power consumption of full GPS functionality
Solution Approach 2:
The patent enables the wireless communication device to determine its own communication direction by measuring the position of the access point relative to itself. This self-positioning approach eliminates the need for external GPS infrastructure and complex positioning systems, achieving the required measurement precision with simpler device structure
3Object-generated harmful factors
If directional antenna is used for millimeter wave communication, then communication interference is reduced, but communication area and signal reception capability deteriorate
Solution Approach 1:
The patent resolves this contradiction by making the antenna directivity dynamic. The system scans multiple directions sequentially with the directional antenna, and by controlling the switching between different directivity directions, it achieves both focused communication (reducing interference) and wide effective coverage area. The dynamic switching compensates for the narrow beam width of the directional antenna
Solution Approach 2:
The patent employs periodic scanning action where the antenna control section sequentially directs the directional antenna toward different potential access points. This periodic action allows the system to maintain narrow directivity for low interference while covering a wide area over time, effectively resolving the contradiction between communication area and interference reduction
Data Source
AI summary
A wireless communication device transmits and receives a signal by a wireless communication using a millimeter wave frequency band. The wireless communication device includes an antenna section having directivities in a plurality of different directions, an antenna control section adapted to form a directivity in a prescribed direction among the plurality of directivities of the antenna section, a direction and position estimation section adapted to estimate direction and position information of a wireless communication device to be communicated with, which is a target for the wireless communication, in accordance with a receiving signal received by the antenna section having the directivity formed, and a display section adapted to display the estimated direction and position information of the wireless communication device to be communicated with.