Magnetoelectric Antenna Array Structure for Reduced Multipaction
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Solution Overview
Problem
Existing magnetoelectric dipole antennas face limitations such as multipaction and structural fragility, making them unsuitable for space-deployed applications, and lack the performance goals of low profile, low mass, large bandwidth, and high power handling.
Innovation Solution
The development of magnetoelectric dipole antenna arrays with orthogonal probes surrounded by conductive plates and dielectric structures, optimized for reduced multipaction, increased bandwidth, and structural ruggedness, featuring a baseplate conductively coupled to plate elements with dielectric spacers between overlapping transverse sections of antenna probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antenna types (helix, patch, dipole) are used for space applications, then certain performance characteristics are achieved, but they suffer from multipaction effects, structural fragility, and excessive mass or profile
Solution Approach 1:
The patent changes the geometric parameters of the antenna structure by introducing a specific configuration of orthogonal probes positioned within gaps between conductive plates. This geometric parameter change creates a magnetoelectric dipole configuration that inherently reduces multipaction while maintaining low mass, resolving the contradiction between reliability and weight.
Solution Approach 2:
The patent employs composite construction by combining conductive probes, dielectric structures, and conductive plates in a integrated magnetoelectric dipole assembly. This composite structure achieves both multipaction resistance and low mass by distributing functions across different materials rather than using a single heavy material throughout.
2Reliability
If traditional antenna types are used for space applications, then certain performance characteristics are achieved, but they suffer from multipaction effects and structural fragility
Solution Approach 1:
The patent converts the harmful multipaction effect into a beneficial design constraint by positioning conductive plates and probes such that gaps are created where multipaction would occur. These same gaps are then utilized to position the orthogonal probes, transforming the harmful vacuum discharge pathway into a functional antenna element configuration that reduces multipaction while enabling magnetoelectric dipole operation.
Solution Approach 2:
The patent applies preliminary anti-action by designing the antenna structure to preemptively prevent multipaction through the magnetoelectric dipole configuration. The orthogonal probe arrangement within plate gaps creates electromagnetic field distribution that suppresses electron multiplication before it can occur, providing inherent protection against multipaction damage.
3Length of moving object
If compact antenna designs are used to reduce profile, then bandwidth and power handling are limited, but larger antennas provide more bandwidth and power handling
Solution Approach 1:
The patent transitions from traditional single-dimension antenna designs to a three-dimensional magnetoelectric dipole configuration with orthogonal probes extending in multiple directions. This dimensional change allows the antenna to achieve high power handling and wide bandwidth within a compact profile by utilizing spatial distribution of electromagnetic fields in three dimensions rather than along a single linear dimension.
Solution Approach 2:
The patent achieves multi-functionality by designing the magnetoelectric dipole configuration to simultaneously provide wide bandwidth, high power handling, and compact profile. The orthogonal probe arrangement within the conductive plate structure enables the antenna to perform multiple functions (radiation, polarization diversity, impedance matching) within a single integrated compact structure, resolving the trade-off between size and performance.
4Adaptability or versatility
If existing ME dipole antennas are used, then dual polarization is achieved, but they suffer from structural fragility and multipaction
Solution Approach 1:
The patent merges the two orthogonal probe structures into a single integrated magnetoelectric dipole assembly positioned within the conductive plate gaps. This merging of previously separate probe structures into one unified configuration reduces the number of discrete components and connections, thereby reducing structural fragility while preserving dual polarization capability through the orthogonal geometry of the combined structure.
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 optimized ME dipole antennas achieve over 40% bandwidth, under 1 dB axial ratio, and under ±1 cm group delay variation, with reduced multipaction and high structural ruggedness, enabling them to be a fraction of the protrusion profile of helix antennas and half the weight of microstrip patch arrays, suitable for space applications like radionavigation satellites.
Implementation Method 1
Dielectric structures for each pair of antenna probes comprise a dielectric material having channels that recess the conductive strips therein
Implementation Method 2
a dielectric spacer positioned between overlapping transverse sections of the antenna probes
Implementation Method 3
Multipaction, or the multipactor effect, is a resonance effect for electrons in vacuum that can exist in response to RF fields accelerating electrons in the voids in waveguides or antenna devices
Data Source
AI summary
Provided herein are various magnetoelectric dipole antenna arrays and multi-array arrangements for handling radio frequency signals. In one example, an antenna array includes a baseplate conductively coupled to sets of plate elements by support members that position the plate elements at selected distances offset from a surface of the baseplate. Antenna probes are arranged in orthogonal pairs positioned within gaps between a corresponding set of plate elements, with each antenna probe comprising a conductive strip having a feed section coupled to a radio frequency connection through the baseplate, a transverse section generally parallel with the baseplate, and a terminal section directed back toward the baseplate. Dielectric structures for each pair of antenna probes comprise a dielectric material having channels that recess the conductive strips therein and a dielectric spacer positioned between overlapping transverse sections of the antenna probes.