OMT Feeder Rotation for XPD Adjustment in Dual Polarization Antennas
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Solution Overview
Problem
The challenge lies in upgrading single polarization antennas to dual polarization antennas without adequate cross-polarization discrimination (XPD) performance, as the XPD indicator is not commissioned during production of single polarization antennas, leading to suboptimal performance in dual polarization systems.
Innovation Solution
The introduction of an orth-mode transducer (OMT) assembly comprising an OMT common port, a tubular OMT feeder with unequal horizontal and vertical axes, and a polarization separated core, allowing for adjustment of XPD performance through rotation of the OMT feeder, which is connected between the OMT common port and the polarization separated core, enabling the adjustment of relative phases between circular polarization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single polarization antenna is upgraded to a dual polarization antenna by replacing the antenna feeder, then the XPD performance can be adjusted to meet requirements, but the operability is reduced when the antenna feeder cannot be removed or replaced
Solution Approach 1:
The patent segments the feeder system into two independent parts: the original antenna feeder that remains fixed, and a new OMT feeder that can be independently installed and adjusted. This segmentation allows the OMT feeder to be adjusted for XPD performance without requiring removal or modification of the original antenna feeder, thereby resolving the contradiction between achieving required XPD performance and maintaining ease of operation.
2Reliability
If the antenna feeder is made rotatable to adjust XPD, then the XPD performance can be optimized, but the structural complexity increases
Solution Approach 1:
The patent extracts the rotation and adjustment function from the original antenna feeder and relocates it to the OMT feeder. The OMT feeder is designed with an adjustable structure that can be rotated or adjusted to optimize XPD performance, while the original antenna feeder remains simple and fixed. This extraction reduces the structural complexity of the overall system by concentrating the adjustment mechanism in a dedicated component.
3Reliability
If the OMT feeder is made adjustable to improve XPD performance, then the dual polarization transmission quality improves, but the device complexity increases
Solution Approach 1:
The OMT feeder is designed to perform multiple functions: it serves as the connection between the OMT common port and the polarization separated core, provides adjustment capability for optimizing XPD performance, and maintains a tubular structure that guides electromagnetic waves. By integrating these multiple functions into a single component, the patent reduces the need for additional separate adjustment mechanisms, thereby limiting the increase in device complexity while achieving improved dual polarization transmission quality.
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 the operability of upgrading single polarization antennas to dual polarization antennas by improving XPD performance without the need to replace or rotate the antenna feeder, ensuring the dual polarization antenna meets specification requirements, thus improving spectrum utilization and transmission capacity.
Implementation Method 1
the OMT feeder located between the OMT common port and the polarization separated core rotates... the vertical polarization port is configured to transmit a vertical polarization wave, and the horizontal polarization port is configured to transmit a horizontal polarization wave
Data Source
Figure 1~2c
Figure 3~5a
Figure 5b~7
AI summary
Embodiments of this application disclose an OMT assembly and an OMT apparatus, to improve operability of reconstructing a single polarization antenna to a dual polarization antenna. The OMT assembly includes: an OMT common port, an OMT feeder, and a polarization separated core, where an input end of the OMT common port is connected to a single polarization antenna; one end of the OMT feeder is connected to an output end of the OMT common port, and the other end of the OMT feeder is connected to the polarization separated core, so that the OMT feeder located between the OMT common port and the polarization separated core rotates; the OMT feeder is of a tubular structure, and a horizontal axis and a vertical axis of an inner wall cross section of the OMT feeder are unequal, or a tuning rod is disposed in a tube of the OMT feeder, and the tuning rod is perpendicular to an extension direction of the tube of the OMT feeder; and a vertical polarization port and a horizontal polarization port are disposed in the polarization separated core, the vertical polarization port is configured to transmit a vertical polarization wave, and the horizontal polarization port is configured to transmit a horizontal polarization wave.