Switched Beam Antenna Pattern Adaptation
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Solution Overview
Problem
The challenge in mobile repeater systems is adapting the directional antenna pattern in real-time to maintain optimal communication with a changing base station location, as active antenna arrays are costly and require significant computational power.
Innovation Solution
A switched beam antenna system with a geolocation device and directional sensor, controlled by a processor to dynamically switch between beams based on the mobile repeater's location and direction relative to the base station, allowing for rapid adaptation of the radiation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active antenna array is used to dynamically adapt the beam pattern, then the gain and communication reliability are improved, but the cost and computational power requirements increase significantly
Solution Approach 1:
The antenna array is segmented into multiple fixed beam patterns, each covering a specific directional sector. Instead of dynamically adjusting a continuous beam, the system divides the 360-degree coverage into discrete beam segments that can be switched between, reducing the complexity of real-time adaptation while maintaining reliable communication coverage.
Solution Approach 2:
The system implements dynamic beam switching based on the mobile repeater's location and orientation. The control processor dynamically selects which fixed beam pattern to activate by processing data from geolocation devices and directional sensors, enabling the antenna system to adapt to changing conditions without requiring complex real-time beam forming capabilities.
2Power
If a directional antenna pattern is used to increase gain, then the signal strength is improved, but the system becomes less adaptable to changing base station locations
Solution Approach 1:
The antenna system is designed with multiple fixed beam patterns that collectively provide omnidirectional coverage capability. Each individual beam provides high directional gain, while the set of beams collectively enables the system to adapt to any base station location by switching between appropriate beams, thus achieving both high gain and location adaptability.
Solution Approach 2:
The control processor receives feedback from geolocation devices and directional sensors about the mobile repeater's current position and orientation. Based on this feedback, the system automatically selects and switches to the appropriate beam pattern that maximizes signal gain toward the current base station location, maintaining both high gain and adaptability to changing conditions.
Data Source
AI summary
This document describes a system that is used to dynamically adapt the radiation pattern of the donor antenna of a mobile repeater system. In some implementations, a switched beam antenna is used, in which a location of a mobile repeater is determined relative to a base station, as well as directionality relative to the base station. A correct beam, i.e., a beam with the highest gain based on the location and directionality, is determined and switched on based on a determined gain of that beam.