Cylindrical Feed Antenna Element Placement
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Solution Overview
Problem
The fabrication of large antennas is hindered by high costs and sensitivity to small errors, making it challenging to apply active matrix technologies, and existing segmentation methods are not feasible for cylindrical feed antennas.
Innovation Solution
The placement of antenna elements on concentric rings with matrix drive circuitry allows for unique addressing and control of each element, enabling efficient fabrication and operation of cylindrical feed antennas by using a controller to apply voltage and adjust the capacitance of liquid crystal cells for beam forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active matrix technologies are used to drive antenna elements, then each antenna element can be uniquely addressed and controlled, but the device complexity and fabrication difficulty increase significantly
Solution Approach 1:
The antenna aperture is divided into multiple segments, each containing a subset of antenna elements that can be independently controlled. This segmentation allows the complex antenna system to be broken down into manageable units, reducing fabrication complexity while maintaining the ability to uniquely address and control each element through matrix drive circuitry.
Solution Approach 2:
Antenna elements are arranged in a two-dimensional matrix pattern across the aperture, with rows and columns enabling unique addressing. This spatial arrangement in multiple dimensions allows for systematic control of each element while simplifying the drive circuitry architecture, as elements can be addressed through row-column intersection rather than requiring individual dedicated circuits.
2Reliability
If large antenna arrays are fabricated as single units, then RF performance can be optimized, but fabrication costs increase and sensitivity to errors rises
Solution Approach 1:
The large antenna aperture is divided into multiple smaller segments that can be fabricated separately using standard manufacturing processes. Each segment contains a manageable number of antenna elements with associated drive circuitry. These segments are then assembled to form the complete antenna array, reducing fabrication costs and minimizing the impact of errors since only individual segments need to be manufactured with high precision rather than the entire large array.
Solution Approach 2:
Multiple identical or similar antenna segments are created using the same fabrication process and design template. This copying approach allows for standardized manufacturing of segments, reducing costs through economies of scale and simplifying quality control. The segments can be replicated and assembled to build larger antenna systems without requiring custom fabrication for each element.
3Ease of operation
If antenna elements are arranged in rows and columns for matrix drive, then ease of control is improved, but this arrangement is not feasible for cylindrical feed antennas
Solution Approach 1:
The antenna elements are arranged in a curved or circular pattern around the cylindrical feed, adapting the matrix drive concept to a non-planar geometry. This curved arrangement maintains the systematic addressing capability of matrix drives while being compatible with the cylindrical feed structure, allowing unique identification and control of each element through modified row-column addressing schemes that account for the curved aperture geometry.
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 approach reduces fabrication complexity and costs, improves RF performance, and allows for precise control of beam direction and radiation patterns, enhancing the efficiency and accuracy of large antenna systems.
Implementation Method 1
a controller to control each antenna element of the array separately using matrix drive circuitry, where each of the antenna elements is uniquely addressed by the matrix drive circuitry
Data Source
AI summary
A method and apparatus is disclosed herein for antenna element placement are disclosed. In one embodiment, an antenna comprises an antenna feed to input a cylindrical feed wave; a single physical antenna aperture having at least one antenna array of antenna elements, where the antenna elements are located on a plurality of concentric rings concentrically located relative to an antenna feed, wherein rings of the plurality of concentric rings are separated by a ring-to-ring distance, wherein a first distance between elements along rings of the plurality of concentric rings is a function of a second distance between rings of the plurality of concentric rings; and a controller to control each antenna element of the array separately using matrix drive circuitry, where each of the antenna elements is uniquely addressed by the matrix drive circuitry.