Beam Waveguide Mizuguchi Reflector Sets for Wide Field of Regard
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Solution Overview
Problem
Conventional beam waveguides face challenges in achieving a wide angular range of motion or field of regard due to high torque requirements and restrictions on rotation between offset paraboloid reflectors, leading to inefficiencies and limitations in antenna performance, particularly in satellite systems requiring high gain and auto-tracking capabilities.
Innovation Solution
The implementation of a beam waveguide with a pair of dual offset reflector sets that satisfy the Mizuguchi condition, allowing for axi-symmetric radiation patterns and rotation without distortion, enabling a complete field of regard and maintaining antenna efficiency by using hyperboloid and paraboloid reflectors to produce and convert spherical waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional beam waveguides with offset paraboloid reflectors are used, then the structure provides directional beam control, but the field of regard is limited due to high torque requirements and rotation restrictions
Solution Approach 1:
The patent employs dual offset reflector sets with asymmetric geometries that satisfy the Mizuguchi condition. The reflectors are positioned and oriented asymmetrically relative to the beam axis, creating a configuration where the offset distances and angles are specifically designed to produce symmetric radiation patterns while enabling rotation without distortion. This asymmetric design allows the antenna to achieve a complete field of regard without the high torque requirements that plague conventional symmetric offset designs.
2Adaptability or versatility
If conventional beam waveguides with rigid structures are used, then the mirrors are held in fixed positions, but rotations are restricted to minimize losses and reduce mass
Solution Approach 1:
The dual offset reflector sets are designed with specific asymmetric geometries that satisfy the Mizuguchi condition, allowing the reflectors to be rotated relative to each other without causing signal distortion or loss. The asymmetric configuration ensures that the optical path lengths and phase relationships are maintained during rotation, enabling full rotational capability while preserving signal integrity.
Solution Approach 2:
The patent introduces dynamic rotational capability between the dual offset reflector sets, transforming the previously static rigid structure into a dynamic system. The reflectors can rotate relative to each other around the beam axis, enabling the antenna to achieve a complete field of regard. This dynamic design is made possible by the Mizuguchi condition geometry, which ensures that rotation does not degrade performance.
3Reliability
If dual offset reflector sets are used, then the beam can be collimated and re-created, but rotations between reflectors cause field distortions and loss of antenna efficiency
Solution Approach 1:
The patent uses dual offset reflector sets with asymmetric geometries satisfying the Mizuguchi condition, where the offset distances and angles are specifically configured to produce symmetric radiation patterns. This asymmetric design paradoxically enables rotation freedom while maintaining antenna efficiency, because the specific geometric relationships ensure that phase and amplitude distributions remain consistent during rotation.
Solution Approach 2:
The patent changes the geometric parameters of the reflector sets to satisfy the Mizuguchi condition, specifically adjusting offset distances and angles to create a configuration that is invariant under rotation. By carefully selecting these parameters, the system achieves both high reliability through maintained efficiency and high adaptability through rotation freedom.
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 allows for a larger potential field of view, increased flexibility in feed horn design, and reduced mass and complexity, while maintaining low cross-polarization and efficient beam tracking, overcoming the limitations of conventional waveguides.
Implementation Method 1
a first set of dual offset reflectors and a second set of dual offset reflectors (304, 306) that may each include reflector geometries to produce a radiation pattern that is symmetric about a first axis (326) between the first and second set of dual offset reflectors (304, 306) and to produce an axi-symmetric beam from the second set of dual offset reflectors (306) that is unaffected by any rotation of the first and second set of dual offset reflectors (304, 306) relative to one another about the first axis (326)
Data Source
AI summary
A beam waveguide may include a first set of dual offset reflectors and a second set of dual offset reflectors. The first set of dual offset reflectors and the second set of dual offset reflectors may each include reflector geometries to produce a radiation pattern that is symmetric about a first axis between the first and second set of dual offset reflectors and to produce an axi-symmetric beam from the second set of dual offset reflectors that is unaffected by any rotation of the first and second set of dual offset reflectors relative to one another about the first axis.