Polarized Radar Antenna Arrays for Wideband Phase Shift Control
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Solution Overview
Problem
Achieving a constant progressive phase shift over a wide bandwidth is challenging in millimeter-wave frequencies for phased array radar systems, which affects their resolution and range.
Innovation Solution
The implementation of a radar system with two perpendicular linear arrays of antennas and a Rotman lens phase-shifting network, allowing for improved azimuth and elevation resolution by processing waves through multiple Rotman lenses for accurate phase shifting and polarization control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phased array radar system operates at millimeter-wave frequencies to achieve superior resolution and range, then measurement precision is improved, but maintaining a constant progressive phase shift over a wide bandwidth becomes significantly more difficult
Solution Approach 1:
The system divides the antenna array into multiple sub-arrays with independent phase control, allowing each segment to be optimized for maintaining constant progressive phase shift across the bandwidth while the overall array achieves superior resolution through combined operation
Solution Approach 2:
The system dynamically adjusts phase shift parameters across different frequency bands to maintain constant progressive phase shift over the wide millimeter-wave bandwidth, resolving the contradiction between frequency range expansion and phase control stability
2Measurement precision
If the frequency range is pushed into the millimeter-wave range and beyond to achieve imaging radar systems, then measurement precision is improved, but bandwidth maintenance with minimal losses becomes challenging
Solution Approach 1:
The patent introduces intermediate signal processing components and optimized transmission paths that act as mediators to minimize signal losses in the millimeter-wave range while preserving the high frequency benefits for imaging resolution
Solution Approach 2:
The system employs composite material structures in the antenna and transmission components that are optimized for millimeter-wave frequencies, reducing energy losses while maintaining the high frequency operation necessary for superior imaging resolution
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 configuration enhances the radar system's ability to distinguish between objects at similar range but different bearings and elevations, achieving finer angular resolution with minimal power loss and reflection, thereby improving object detection accuracy.
Implementation Method 1
phase-shifting first waves by propagating the first waves through a first Rotman lens that is in operative communication with the first linear array of transmit antennas
Implementation Method 2
Electromagnetic waves propagate in propagation directions between the first end and the second end
Implementation Method 3
Polarization of the first set of waves transmitted from the linear array of antennas of the first transmit planar component and polarization of the second set of waves are transmitted from the linear array of antennas of the second transmit planar component are perpendicular to one another
Data Source
AI summary
A front end of a radar system is provided with a first front end apparatus and a second front end apparatus. A first transmit planar component and a first receive planar component in the first front end apparatus are arranged to be perpendicular to one another. A second transmit planar component and a second receive planar component in the second front end apparatus are arranged to be perpendicular to one another. A linear array of antennas is located along a second end of each planar component. Polarization of a first set of waves transmitted from the linear array of antennas of the first transmit planar component and polarization of a second set of waves transmitted from the linear array of antennas of the second transmit planar component are perpendicular to one another.