Aircraft Radar Antenna Electronic Beam Steering
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Solution Overview
Problem
Conventional aircraft weather radar systems have limited scan angles, are heavy, occupy excessive space, and are prone to mechanical failures due to their mechanical scanning mechanisms, which also lead to increased weight and power consumption, making them less efficient and reliable.
Innovation Solution
A radar system with an antenna that rotates about a single axis mechanically and electronically steers the RF beam for tilt scans, reducing the need for motorized mechanisms, minimizing weight, and allowing for wider scan angles beyond 180 degrees, while using a redundant design to enhance reliability and reduce space and power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical scanning is used with motors and gears to physically rotate and tilt the antenna, then the antenna can scan both vertical and horizontal axes, but the system becomes heavier, occupies more space, and is susceptible to mechanical failure
Solution Approach 1:
The patent replaces the mechanical tilt scanning system with an electronic RF beam steering system. The antenna physically rotates only on the vertical axis for azimuth scanning, while electronic phase shifters and delay lines steer the beam in the horizontal plane for tilt scanning. This eliminates motors, gears, and mechanical tilt mechanisms, reducing complexity and improving reliability.
2Stability of the object's composition
If motors are sized to compensate for vibration, acceleration, and deceleration, then the antenna can maintain stability during scanning, but the motor sizes become larger and dissipate more power
Solution Approach 1:
The patent eliminates the need for oversized motors by replacing mechanical tilt scanning with electronic beam steering. The antenna rotates only on one vertical axis requiring a single motor, while beam direction in the horizontal plane is controlled electronically through phase shifting, dramatically reducing power consumption and motor size.
3Reliability
If the mounting apparatus is positioned in the rotation area of the antenna to support mechanical scanning, then the antenna can be mechanically scanned, but the effective scan angle is limited to 180 degrees or less
Solution Approach 1:
The patent transitions from mechanical scanning in multiple dimensions to a hybrid approach where physical rotation provides azimuth coverage and electronic beam steering provides tilt coverage. This dimensional separation allows the antenna to scan beyond 180 degrees azimuthally while the electronic system provides unlimited tilt angle capability without mechanical constraints.
4Reliability
If RF power is increased to compensate for transmission losses through rotary couplings, then signal strength is maintained, but excess RF power is generated
Solution Approach 1:
The patent eliminates rotary couplings by using a fixed mounting apparatus with a single vertical rotation axis. The antenna rotates on this axis without requiring complex rotary RF couplings, as the feed system remains stationary. This eliminates RF power losses associated with rotary couplings and the need to overcompensate with excess power.
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 results in a lighter, more reliable, and efficient radar system with improved scan capabilities, reduced susceptibility to vibrations, and enhanced reliability by eliminating single-point failure components, thus addressing the limitations of traditional mechanical scanning systems.
Implementation Method 1
The antenna scans a first direction by rotating about the axis and scans a second direction by electronically steering the radio frequency (RF) beam
Data Source
AI summary
A radar system is disclosed. The radar system comprises an antenna mounting apparatus coupled to the aircraft, and an antenna rotatably coupled to the mounting apparatus. The antenna is configured to rotationally orientate for an azimuth scan and electronically orientate for a tilt scan.