Multi-Polarized Phased Array Antenna Isolation via Feed Line Phase Delay
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Solution Overview
Problem
Existing phased array antennas face challenges in maintaining isolation between different polarizations, particularly in multi-polarized designs, which affects their efficiency and area utilization.
Innovation Solution
A multi-polarized scanning phased array antenna is designed with phase delays in feed lines to cancel out polarized signals, allowing for increased isolation between polarizations by using phase shifts in feed lines to ensure that signals from one polarization do not interfere with the other, even when both are active.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a multi-polarized phased array antenna is used to reduce area, then area utilization is improved, but isolation between polarizations deteriorates
Solution Approach 1:
The antenna elements are segmented into different polarization groups (horizontal and vertical feeds) with dedicated feed lines for each polarization. This segmentation allows independent control and phase manipulation of each polarization channel, enabling complete isolation while sharing the same physical antenna elements for area efficiency.
Solution Approach 2:
The patent employs composite feed line structures with different electrical path lengths and phase delay characteristics for horizontal and vertical polarizations. By designing feed lines with different effective dielectric constants or physical lengths, the system achieves differential phase shifts that enable complete polarization isolation while using the same antenna elements.
2Reliability
If phase delays are added to feed lines to cancel polarized signals, then isolation between polarizations is improved, but device complexity increases
Solution Approach 1:
The patent achieves signal cancellation by changing the phase parameter of the feed lines. By introducing specific phase delays (typically 90° or 180°) in the horizontal and vertical feed lines, the system transforms the polarization components to achieve complete isolation. This parameter-based approach avoids adding complex physical structures.
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 achieves complete isolation between polarizations, enabling a single antenna element to handle both polarizations simultaneously without cancellation or attenuation issues, thereby improving antenna efficiency and reducing the required antenna area.
Implementation Method 1
The phase delay is configured to cancel a polarized signal associated with the multi-polarized scanning phased array antenna. At least one of the first and second phase delays may include a 180° phase shift.
Data Source
AI summary
A multi-polarized scanning phased array antenna includes a plurality of elements, a first feed line operatively coupling the plurality of elements, a second feed line operatively coupling the plurality of elements, and a phase delay operatively coupled in at least one of the first feed line and the second feed line. The phase delay is configured to cancel a polarized signal associated with the multi-polarized scanning phased array antenna. A method of increasing isolation between polarizations in a multi-polarized scanning phased array antenna includes coupling a plurality of elements operatively with a first feed line, coupling the plurality of elements operatively with a second feed line, and coupling a phase delay operatively in at least one of the first feed line and the second feed line such that a polarized signal associated with the multi-polarized scanning phased array antenna is cancelled.