Two-Dimensional Scanning Cylindrical Reflector Antenna
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Solution Overview
Problem
Cylindrical reflector antennas face limitations in efficiently scanning and focusing electromagnetic radiation in two dimensions, particularly in adjusting the incident angle of energy beams relative to the vertex line and characterizing the surface of the reflector.
Innovation Solution
A parabolic cylindrical reflector antenna system with multiple line-array antenna feeds positioned along the focal line, electronically adjusting the phase of each feed to change the incident angle and using mechanical or rotational mechanisms to scan along the straight and curved edges of the reflector, allowing for two-dimensional scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single antenna feed is used at the focal line, then the structure is simple, but the scanning capability in two dimensions is limited
Solution Approach 1:
The single antenna feed is segmented into multiple antenna feeds arranged in a line array along the focal line. Each feed element can be independently controlled to illuminate different portions of the reflector aperture, enabling electronic scanning in one dimension while maintaining a relatively simple overall structure compared to fully mechanical systems.
Solution Approach 2:
The patent combines electronic phase control in one dimension (along the focal line) with mechanical positioning in another dimension (perpendicular to the focal line). This two-dimensional scanning approach allows comprehensive coverage of the radiation pattern without requiring complex mechanisms in both dimensions simultaneously.
2Ease of operation
If mechanical positioning mechanism is used to move antenna feeds, then scanning along curved edge is achieved, but the device complexity increases
Solution Approach 1:
The patent merges electronic phase control with mechanical positioning into a unified scanning system. The electronic control handles scanning along the straight focal line, while the mechanical positioning mechanism handles scanning perpendicular to the focal line, creating a coordinated two-dimensional scanning system that leverages the strengths of both approaches.
Solution Approach 2:
The mechanical positioning mechanism is designed to work in conjunction with the electronic phase control system, allowing the same physical antenna feed array to perform both electronic scanning (along the focal line) and mechanical scanning (perpendicular to the focal line), thereby achieving universal scanning capability with a single integrated system.
3Speed
If antenna feeds are electronically adjusted to change incident angle, then scanning speed improves, but the precision of surface characterization may be reduced
Solution Approach 1:
The patent replaces purely mechanical scanning with electronic phase control for scanning along the focal line. This substitution enables much faster scanning speeds since electronic phase changes occur instantaneously compared to mechanical movement, while the precision is maintained through accurate phase control algorithms that compensate for the electronic approach.
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
Enables precise scanning and characterization of the reflector surface, enhancing the antenna's ability to focus and direct electromagnetic radiation effectively in both dimensions.
Implementation Method 1
The reflector has a focal line parallel to the cylindrical axis. An antenna feed may be located along the focal line, centered relative to the reflector. The antenna feed may project electromagnetic radiation towards the reflector, which reflects a beam from the antenna feed
Data Source
AI summary
A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.