Triangular Lattice Phased Array Antenna Design
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Solution Overview
Problem
Current phased array antennas struggle to support ultra-wideband applications due to their inability to maintain performance while scanning, particularly with existing solutions relying on bulky and narrow-band waveguides.
Innovation Solution
The development of a phased array antenna using a triangular lattice configuration of dipole antennas on a Printed Circuit Board (PCB) substrate, allowing for a larger unit cell size and improved flexibility in geometry, which supports ultra-wideband operations without compromising grating-lobe free maximum limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveguides are used to form the aperture of the phased array antenna, then the antenna can operate at radio frequencies, but the waveguides are bulky and narrow-band, preventing ultra-wide bandwidth operation
Solution Approach 1:
The antenna aperture is segmented into multiple planar dipole elements arranged in a triangular lattice, replacing the monolithic waveguide structure. This segmentation allows each dipole to be independently fed and controlled, enabling ultra-wideband operation while maintaining a compact form factor.
Solution Approach 2:
The mechanical waveguide system is replaced with an electromagnetic dipole array system. Instead of using physical waveguide structures to guide RF energy, the invention uses multiple planar dipoles fed by corporate feed networks, achieving the same aperture function with significantly reduced size and improved bandwidth.
2Adaptability or versatility
If waveguides are used to form the aperture, then the antenna structure is established, but the narrow-band characteristic prevents scanning and ultra-wideband applications
Solution Approach 1:
The antenna system incorporates dynamic beam steering capability through electronic phase control of the dipole elements. By varying the phase and amplitude of each element in the triangular lattice, the beam can be electronically scanned across wide angles without mechanical movement, achieving adaptability while maintaining structural simplicity.
Solution Approach 2:
The planar dipole array structure serves multiple functions: it provides the radiating aperture, enables ultra-wideband operation, supports electronic beam scanning, and maintains a compact form factor. This multi-functionality replaces the specialized waveguide structure with a more versatile dipole-based system.
3Reliability
If a larger unit cell size is used in the triangular lattice configuration, then RF performance and cross-polarization are improved, but the physical dimensions of the antenna increase
Solution Approach 1:
The antenna transitions from traditional two-dimensional planar arrays to a three-dimensional triangular lattice configuration. This dimensional change allows for larger effective unit cell sizes with improved RF performance and cross-polarization characteristics while maintaining a compact overall footprint through spatial distribution of elements.
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 RF performance by increasing unit cell size, reducing RF packaging, and improving cross-polarization and axial ratio performance, enabling effective operation over a wider frequency band and scan volume.
Implementation Method 1
When the phased array is in a transmit mode, electrical signals generated by the electronics are fed to the antenna elements, which convert the electrical signals into radiant energy
Implementation Method 2
When the phased array is in a receive mode, each of the antenna elements capture some portion of the Radio Frequency (RF) energy from incoming signals and convert the RF energy into separate electrical signals
Implementation Method 3
The control electronics vary the phase relationship between the antenna elements such that radio waves from the separate antenna elements add together to increase radiation in a desired direction
Data Source
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AI summary
Unit cells for phased array antennas are described. The unit cells include a plurality of dipole antennas that are used to form a phased array antenna. In particular, the unit cells that form the phased array antenna each include a plurality of dipole antennas formed on a surface of a substrate that are arranged to collectively form a triangle. A plurality of the unit cells may be linked together to form a triangular lattice array having almost any desired size and aperture, thereby allowing the RF engineer the freedom to achieve a wide variety of performance goals when designing a phased array antenna.