Peripheral Calibration Antenna Layout for Phased Array Near-Field Coupling
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Solution Overview
Problem
Phased array antennas in satellite and airborne applications face calibration challenges due to the complexity and cost of embedding calibration antennas within the array, which can lead to performance degradation and increased manufacturing costs, especially when ground-based calibration is not feasible.
Innovation Solution
The use of directional calibration antennas located on the periphery of the array antenna in a near-field region, which can couple strongly to antenna elements, offering improved performance and reduced interference, and allowing for simpler mechanical design and compact size compared to conventional calibration antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If calibration antennas are embedded within the phased array antenna, then calibration functionality is integrated, but device complexity and manufacturing cost increase
Solution Approach 1:
The calibration antenna is extracted from the phased array antenna structure and placed as a separate peripheral component. This allows the calibration function to be maintained while reducing the complexity of the main antenna array, as the calibration antenna operates independently from the signal radiating elements.
Solution Approach 2:
A peripheral calibration antenna is introduced as an intermediary component that couples to the phased array antenna through electromagnetic interaction in the near-field region. This mediator enables calibration functionality without requiring direct integration or modification of the main antenna structure.
2Reliability
If calibration antennas are embedded within the phased array antenna, then calibration is achieved, but performance degradation occurs due to interference
Solution Approach 1:
The antenna system is segmented into distinct functional zones: the phased array antenna for signal radiation and the peripheral calibration antenna for calibration operations. This spatial segmentation prevents interference between calibration signals and operational signals, eliminating grating lobes that would occur with embedded calibration elements.
Solution Approach 2:
The calibration antenna is positioned in the near-field region where electromagnetic coupling is strong but does not radiate into the far-field operational region. This localized calibration approach maintains strong coupling for calibration purposes while preventing harmful radiation patterns and grating lobes in the signal transmission direction.
3Reliability
If conventional calibration antennas are used, then calibration is possible, but mechanical design complexity and size increase
Solution Approach 1:
The calibration antenna is positioned in the near-field region rather than the far-field, representing a dimensional change in the calibration approach. This allows for stronger coupling with the phased array elements at a reduced distance, enabling a more compact overall system design while maintaining calibration effectiveness.
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 enables effective in-orbit calibration of phased array antennas with reduced complexity and cost, maintaining performance by using directional antennas that can couple strongly to antenna elements, thus minimizing grating lobes and enhancing the array's radiation pattern.
Implementation Method 1
directional calibration antennas located on a periphery of the array antenna in a near-field region... which can couple strongly to antenna elements
Data Source
AI summary
Technologies directed to a directional calibration antenna for calibration of an array antenna of a communication system are described. The communication system includes the array antenna which includes a number of antenna elements. The number of antenna elements are located in an area on a first side of a support structure. A directional antenna is located at a first height above a plane of the array antenna and at a periphery of the area. The directional antenna is pointed towards the array antenna and is located within a near field of the array antenna.