Vertical Meandered Frequency Selective Limiter for Multi-Octave Bandwidth
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Solution Overview
Problem
Conventional frequency selective limiters (FSLs) face limitations in bandwidth and component size due to in-plane meandering, which restricts their useful fractional bandwidth to 20% and requires larger packaging footprints, while prior solutions like in-plane tapering and lumped elements further restrict bandwidth and reduce limiting capability.
Innovation Solution
The implementation of vertically stacked transmission line structures with parallel-biased DC magnetic fields and tapered conductors, eliminating perpendicular RF magnetic field components, allows for co-packaging multiple FSLs within a single magnetic bias fixture, achieving multi-octave bandwidth and significant reduction in component length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If in-plane meandering is used to reduce component length, then the packaging footprint is reduced, but the useful fractional bandwidth is restricted to 20%
Solution Approach 1:
The patent transitions from in-plane meandering (2D) to vertical stacking (3D) of transmission line structures. By stacking multiple transmission line structures vertically and coupling them through magnetic interaction, the patent achieves compact size while maintaining multi-octave bandwidth, resolving the contradiction between component length reduction and bandwidth preservation.
2Device complexity
If in-plane tapering is used to modify the transmission line, then the structure is simplified, but the bandwidth is further restricted and limiting capability is reduced
Solution Approach 1:
The patent divides the transmission line into multiple discrete stacked structures rather than using continuous in-plane tapering. Each stacked transmission line structure maintains uniform characteristics, avoiding the bandwidth restrictions imposed by tapering while achieving compact through vertical arrangement.
3Adaptability or versatility
If vertically stacked transmission line structures are used, then multi-octave bandwidth is achieved with >60% reduction in component length, but the device complexity increases
Solution Approach 1:
The patent combines multiple transmission line structures in a vertical stack, where each structure contributes to the overall bandwidth performance. The magnetic coupling between adjacent structures merges their electromagnetic fields to achieve multi-octave bandwidth while maintaining compact footprint, balancing the increased structural complexity with enhanced performance.
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 achieves a multi-octave bandwidth with a >60% reduction in component length compared to prior art, maintaining transmission-line impedance and reducing parasitics through vertical meandering and parallel biasing.
Implementation Method 1
first bias magnet disposed along a first length of the plurality of vertically stacked transmission line structures and a second bias magnet disposed along a second length of the plurality of vertically stacked transmission line structures... establish a DC magnetic field having a direction which is substantially parallel to a direction of an RF magnetic field
Implementation Method 2
each of the plurality of vertically stacked transmission line structures comprises: a magnetic material having first and second opposing surfaces... The magnetic material can include a ferrite material... Yttrium iron garnet (YIG)
Implementation Method 3
a plurality of vertically stacked transmission line structures, wherein each one of the plurality of vertically stacked transmission line structures is electrically coupled to a transmission line structure disposed directly above it... one or more conductors disposed on at least one of the surfaces of the magnetic material
Data Source
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AI summary
A frequency selective limiter (FSL) having an input port and an output port can comprise a plurality of vertically stacked transmission line structures. Each of the transmission line structures can be electrically coupled to a transmission line structure disposed directly above it and with a first one of the plurality of vertically stacked transmission line structures having one end corresponding to the FSL input port and a second one of the plurality of vertically stacked transmission line structures having one end corresponding to the FSL output port. Each of the plurality of vertically stacked transmission line structures can comprise a magnetic material having first and second opposing surfaces and one or more conductors disposed on at least one of the surfaces of the magnetic material.