Rotating Shaped Reflector for Multi-Antenna Compact Test Range
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Solution Overview
Problem
Existing compact antenna test range systems are limited in their ability to accurately and efficiently test multiple antennas operating at different frequencies, as they typically involve fixed positions for antennas and optical subsystems, preventing fast switching between antennas.
Innovation Solution
A testing system with a rotating shaped reflector and reflector positioner within an anechoic chamber, allowing for precise rotation of the reflector's focal point towards each antenna, enabling fast switching and accurate measurement of radiation patterns from multiple antennas operating at various frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed positions are used for antennas and optical subsystems in CATR systems, then system complexity is reduced, but the ability to switch between antennas operating at different frequencies is prevented
Solution Approach 1:
The patent introduces a movable shaped reflector that can be rotated to different angular positions, transforming the static CATR system into a dynamic one. This allows the focal point of the reflector to be directed towards different feed antennas, enabling frequency switching capability while maintaining a relatively simple fixed antenna array configuration
Solution Approach 2:
The shaped reflector serves multiple functions: it acts as a focusing element for plane wave generation, a switching mechanism for different frequencies by rotating to different positions, and a positioning element that directs energy to different feed antennas. This multi-functionality enables the system to test multiple antennas at different frequencies without requiring separate testing setups
2Adaptability or versatility
If multiple feed antennas are introduced to extend frequency range, then frequency coverage is improved, but system complexity and calibration difficulty increase
Solution Approach 1:
By making the shaped reflector movable rather than fixed, the system dynamically switches between frequency bands by rotating the reflector to different angular positions. This approach allows multiple feed antennas to operate independently at their respective frequencies without requiring complex simultaneous multi-frequency coordination, thereby reducing calibration difficulty
Solution Approach 2:
The frequency range is segmented into different bands, each handled by a dedicated feed antenna operating at a specific frequency. The movable reflector acts as a switch that connects the appropriate antenna segment to the measurement system, allowing simple single-frequency calibration for each antenna rather than complex multi-frequency calibration
3Productivity
If fast switching between antennas is enabled, then measurement efficiency is improved, but positioning accuracy requirements increase
Solution Approach 1:
The movable shaped reflector enables fast switching between antennas by rotating to pre-determined angular positions that correspond to different feed antennas. This dynamic positioning mechanism allows rapid frequency switching while maintaining accurate alignment through controlled rotational movement, achieving both speed and precision
Solution Approach 2:
The system is configured with feed antennas and reflector positions predetermined for specific frequency bands. Before actual measurements, the reflector is positioned at the appropriate angular position corresponding to the frequency to be tested, and the system is pre-calibrated for that configuration. This preliminary setup reduces the need for frequent repositioning during measurements, maintaining both speed and accuracy
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
This solution enhances accuracy and efficiency in testing, reduces complexity, and lowers costs by allowing for simultaneous testing of antennas across different frequency ranges, facilitating realistic and efficient characterization of devices under test.
Implementation Method 1
at least two feed antennas (13a, 13b, 13c) arranged inside the anechoic chamber (11) and substantially pointing at the shaped reflector (14)... the reflector positioner (15) provides a rotation mechanism that rotates the shaped reflector (14) and directs its focal point towards a field generated by each of the at least two feed antennas
Implementation Method 2
an anechoic chamber for containing a device under test... The shaped reflector corresponds to a parabolic compact antenna test range reflector... the anechoic chamber is a shielded anechoic chamber
Data Source
AI summary
A testing system and a testing method with multiple antennas are provided. The system comprises an anechoic chamber for containing a device under test, at least two feed antennas, a movable shaped reflector, and a reflector positioner rotationally coupled to the shaped reflector. The reflector positioner provides a rotation mechanism that rotates the shaped reflector and directs its focal point towards a field generated by each of the at least two feed antennas.