Microwave Circulator Via Array for Lighter Robust Ferrimagnetic Biasing
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Solution Overview
Problem
Existing passive circulators face manufacturing complexity, reliability issues, and increased weight due to the use of large ferrimagnetic elements and multilayer substrates, which lead to fragility and high production costs.
Innovation Solution
A passive circulator design utilizing a single layer substrate with vias filled with ferrimagnetic material and a magnetically biased DC magnet to generate a preferred magnetic dipole alignment, preventing electromagnetic signal propagation in one direction and allowing it in another, thus reducing the volume and weight of ferrimagnetic material while enhancing robustness and simplifying fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a comparatively large cylindrical ferrimagnetic element is used in a surface mount circulator, then the magnetic field guidance function is achieved, but the device weight increases and fragility increases due to the large opening required
Solution Approach 1:
The patent divides the ferrimagnetic material into multiple discrete elements arranged in an array pattern on the substrate, replacing the single large cylindrical element. This segmentation allows the magnetic field guidance function to be distributed across multiple smaller components, reducing the size of individual elements and the overall opening required in the substrate.
Solution Approach 2:
The patent transitions from a three-dimensional cylindrical ferrimagnetic element to a two-dimensional array of discrete ferrimagnetic elements on the substrate surface. This dimensional change reduces the volume and weight of ferrimagnetic material while maintaining the magnetic field guidance function through the distributed arrangement.
2Reliability
If multilayer substrate structures are used to provide robustness, then the device fragility is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent uses a single substrate with discrete ferrimagnetic elements and vias distributed across it, avoiding the need for multiple stacked substrate layers. This segmented approach achieves the required functionality and robustness without the manufacturing complexity of aligning and bonding multiple layers together.
Solution Approach 2:
Instead of building up robustness through multiple layers (adding complexity), the patent achieves robustness through the distributed array configuration and via structure within a single substrate layer, inverting the conventional approach of using multilayer construction for mechanical strength.
3Reliability
If the density of ferrimagnetic materials is increased to improve magnetic field guidance, then the magnetic field strength is enhanced, but the device weight increases and fragility increases
Solution Approach 1:
The patent concentrates ferrimagnetic material properties locally at discrete via locations rather than distributing dense material throughout a large volume. Each via contains ferrimagnetic material that provides localized magnetic field guidance, achieving effective magnetic field control with minimal total material weight.
Solution Approach 2:
The patent changes the spatial distribution parameter of ferrimagnetic material from a continuous large-volume distribution to a discrete point-like distribution at via locations. This parameter change maintains the necessary magnetic field guidance effectiveness while dramatically reducing the total volume and weight of ferrimagnetic material required.
4Weight of stationary object
If a single layer substrate with vias filled with ferrimagnetic material is used, then the device weight and volume are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the ferrimagnetic material into discrete via-fill configurations that can be manufactured using standard via formation and fill processes. The segmented structure aligns with conventional PCB manufacturing capabilities, where via location, size, and fill are well-controlled parameters, making the precision requirements manageable with existing technology.
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 minimizes the volume and weight of ferrimagnetic material, improves robustness, and simplifies the fabrication process, resulting in more reliable and cost-effective passive circulators with improved yield and surface mount compatibility.
Implementation Method 1
A passive circulator relies on a magnetic field (H-field) in a ferrite medium to establish a magnetic field that guides electromagnetic signals from an input port in a (first) rotational manner to a next port
Implementation Method 2
A preferred magnetic dipole alignment is generated within the ferrimagnetic material having a first direction that substantially prevents an electromagnetic signal from propagating in a second direction opposite the first direction
Data Source
AI summary
A circulator and similar devices adapted for use in the transmission and reception of electromagnetic signals, such as microwave and RF signals. Beneficially, the circulator is formed from a single layer, comprising vias therein that all or some of which are filled with a ferrimagnetic material that is used to generate a magnetic field in a particular direction. The magnetic field is a vector sum of the magnetic field generated in each of the vias filled with a ferrimagnetic material that is biased with an external magnetic field in a specific direction to establish a preferred precessional motion of the material's constituent dipoles. This preferred precessional motion will govern the circulatory behavior and non-reciprocal properties of the device when an external signal is applied. As noted above, this magnetic field guides electromagnetic signals in a first direction that substantially prevents an electromagnetic signal from propagating in a second direction opposite the first direction.