Cylindrically Fed Holographic Antenna With Tunable Slotted Array
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Solution Overview
Problem
Current antenna technologies face limitations in scan range, beam performance, and polarization control, particularly in achieving dual circular polarization at Ka-band, as they require mechanical rotation and fixed impedance elements, which hinder dynamic scanning and polarization fidelity.
Innovation Solution
A cylindrically fed antenna design featuring a tunable slotted array with liquid crystal elements oriented at ±45 degrees, allowing for dynamic polarization control and beam steering through holographic principles, eliminating the need for mechanical movement and maintaining high beam performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical rotation is used to achieve dual circular polarization, then polarization control is achieved, but scan range is limited and device complexity increases
Solution Approach 1:
The patent replaces mechanical rotation systems with a holographic antenna system using amplitude and phase modulation of fixed elements. The polarization control is achieved through electronic modulation of the holographic pattern rather than physical rotation, eliminating mechanical constraints on scan range while maintaining dual circular polarization capability
Solution Approach 2:
The patent implements dynamic polarization control through real-time modulation of the holographic pattern's amplitude and phase. By dynamically adjusting the modulation parameters, the system can switch between different polarization states (RHCP, LHCP, linear) without mechanical movement, enabling full scan range while maintaining polarization fidelity
2Speed
If mechanically-rotated dishes are used for beam scanning, then beam steering is achieved, but device complexity and volume increase
Solution Approach 1:
The patent replaces mechanically-rotated dishes with a holographic antenna array that achieves beam steering through electronic modulation of element amplitudes and phases. The fixed antenna elements are controlled by modulation signals that dynamically reshape the radiation pattern, eliminating the need for mechanical gimbals and rotating structures while maintaining full beam steering capability
3Ease of manufacture
If fixed impedance elements are used in holographic antennas, then manufacturing is simplified, but polarization fidelity during scanning deteriorates
Solution Approach 1:
The patent maintains fixed physical elements for ease of manufacture but introduces dynamic modulation of their electromagnetic characteristics. By modulating the amplitude and phase of signals fed to each fixed element, the system achieves polarization control and maintains polarization fidelity during scanning, effectively making the electrical characteristics dynamic while the physical structure remains static
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
The solution enhances scan range to 75 degrees, reduces antenna volume, maintains high beam performance with coarser controls, and enables dynamic polarization control, including circular and linear polarizations, without requiring a polarizer, while simplifying the feed structure and reducing sensitivity to manufacturing errors.
Implementation Method 1
tunable slotted array with liquid crystal elements oriented at ±45 degrees
Implementation Method 2
tunable slotted array with liquid crystal elements oriented at ±45 degrees
Implementation Method 3
an antenna feed to input a cylindrical feed wave
Data Source
Figure 1~5
Figure 2A~2B
Figure 3~4
AI summary
An apparatus is disclosed herein for a cylindrically fed antenna and method for using the same. In one embodiment, the antenna comprises an antenna feed to input a cylindrical feed wave and a tunable slotted array coupled to the antenna feed.