Rotating Mirror Antenna Assembly for Fast mmWave Beam Scanning
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Solution Overview
Problem
Existing rotating horn antennas for high-frequency wireless systems are limited by slow measurement speed, mechanical issues, and high cost of rotary joints, making dynamic measurements and directional signal transmission challenging.
Innovation Solution
A redirecting rotating mirror arrangement (ReRoMA) decouples sensitive RF components from the rotating device, using a rotatable mirror to reflect electromagnetic beams and enable continuous rotation without mechanical stress, allowing for faster and more efficient directional measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a rotating horn antenna is used for directional measurements, then directional signal transmission and reception is achieved, but measurement speed is slow due to mechanical rotation limitations
Solution Approach 1:
The patent replaces the mechanical rotation of the horn antenna with an electromagnetic field-based solution. A fixed horn antenna combined with a rotating reflector array creates directional beams through electronic control of reflector positions, eliminating mechanical rotation of the entire antenna assembly and enabling faster, more reliable measurements
Solution Approach 2:
The patent divides the single rotating horn antenna into multiple fixed horn antennas, each paired with its own reflector. This segmentation allows parallel operation of multiple antenna-reflector pairs, increasing measurement speed while maintaining directional capabilities without the mechanical reliability issues of a single large rotating assembly
2Productivity
If a phased array is used for directional measurements, then measurement speed is improved, but system complexity and cost increase due to multiple antennas and converters
Solution Approach 1:
The patent makes a single reflector array serve multiple functions by dynamically repositioning individual reflectors to work with different fixed horn antennas. This allows one reflector array to replace what would traditionally require multiple independent antenna assemblies, reducing overall system complexity while maintaining high measurement efficiency
Solution Approach 2:
The patent introduces dynamic repositioning of reflectors between fixed horn antennas, allowing the system to adapt its configuration based on measurement requirements. This dynamic adjustment enables the system to achieve phased-array-like performance with simpler hardware by moving reflectors to different positions rather than having multiple fixed antenna elements
3Speed
If continuous rotation at high speed is implemented, then measurement speed increases, but rotary joints experience mechanical stress and have limited lifetime
Solution Approach 1:
The patent extracts the rotation function from the horn antenna and separates it into independent components: fixed antennas and movable reflectors. The reflectors rotate or reposition independently at lower speeds, while the fixed antennas remain stationary, eliminating the need for high-speed rotary joints in the antenna feed system and extending component lifetime
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 ReRoMA enables rapid, cost-effective directional measurements and transmissions, overcoming mechanical limitations and joint wear issues, facilitating dynamic channel characterization and improved signal-to-noise ratios.
Implementation Method 1
a rotatable mirror that reflects an electromagnetic beam to or from the directional antenna subcomponent
Data Source
AI summary
A redirecting rotating mirror arrangement includes a directional antenna subcomponent having a direction of maximum received or transmitted beam intensity. The redirecting rotating mirror arrangement also includes a rotatable mirror that reflects an electromagnetic beam to or from the directional antenna subcomponent. The rotatable mirror is inclined at an inclination angle with respect to a horizontal plane. The arrangement also includes a motor that rotates the rotatable mirror about the direction of maximum received or transmitted beam intensity such that the electromagnetic beam is either received from or transmitted to a range of angles as the rotatable mirror rotates.