Distributed-Element Filter for mmWave Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication devices face interference from spurious emissions at mmWave frequencies, such as those above 32 GHz, which cause noise and disrupt communication.
Innovation Solution
The implementation of frequency-filtering circuitry using distributed elements, including a main branch and parallel branches connected via traces, effectively rejects power at undesired frequencies while minimizing power loss for desired frequencies, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional lumped-element filters are used for mmWave frequencies, then the filter can be implemented with simple components, but the filter becomes bulky and difficult to integrate into compact devices
Solution Approach 1:
The patent replaces traditional lumped-element filters with distributed-element filters implemented using transmission line structures on PCB traces. This substitution of mechanical/electrical components with electromagnetic field-based distributed elements enables compact integration while maintaining filter functionality at mmWave frequencies
Solution Approach 2:
The patent transitions from planar lumped-element implementations to three-dimensional distributed-element structures utilizing multiple PCB layers and vertical interconnects. This dimensional expansion allows the filter to achieve compact footprint by utilizing the vertical dimension of the PCB stackup
2Volume of moving object
If distributed-element filters are used to reduce filter size, then the filter becomes more compact, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs electromagnetic field simulation to optimize transmission line parameters including trace width, trace thickness, and dielectric properties. By carefully controlling these parameters within standard manufacturing tolerances, the design achieves compact dimensions while remaining manufacturable
Solution Approach 2:
The patent introduces intermediate simulation and modeling steps that serve as a bridge between design intent and manufacturing reality. Electromagnetic field simulations allow virtual prototyping and optimization before fabrication, enabling precise control of distributed element characteristics without requiring ultra-precise manufacturing
3Object-affected harmful factors
If the filter rejects power at frequencies over 32 GHz, then interference from spurious emissions is reduced, but power loss for desired frequencies below 29.5 GHz may increase
Solution Approach 1:
The patent designs the distributed-element filter structure with spatially varying characteristics where different sections of the transmission lines are optimized for different frequency ranges. The filter provides strong rejection for frequencies above 32 GHz while maintaining low insertion loss for frequencies below 29.5 GHz through localized impedance transformations and resonance structures positioned at specific locations in the distributed element network
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 effectively rejects at least 5 decibels of power at frequencies over 32 GHz while maintaining a power loss of no more than 1.1 decibels for frequencies below 29.5 GHz, enhancing communication reliability in the mmWave frequency range.
Implementation Method 1
frequency-filtering circuitry that uses distributed elements rather than lumped elements... The frequency-filtering circuitry includes a main branch, a first branch coupled to the main branch via a first connecting trace... The first branch extends in a same direction as the main branch
Implementation Method 2
spurious emissions in the mmWave frequencies, such as those at greater than 32 GHz caused by satellite and/or space communications, may cause interference with device communications
Data Source
AI summary
Frequency-filtering circuitry is disclosed that rejects power of a wireless signal having an undesired frequency while causing a decreased power loss to a wireless signal having a desired frequency using distributed elements, rather than lumped elements. The frequency-filtering circuitry may reject at least 5 decibels of power of a wireless signal having a frequency over 32 gigahertz, while causing a power loss of at most 1.1 decibels to a wireless signal having a frequency lower than 29.5 gigahertz. The frequency-filtering circuitry may include a main branch, a first parallel branch coupled and parallel to the main branch via a first connecting trace, and a second parallel branch coupled and parallel to the main branch via a second connecting trace. The first connecting trace intersects the main branch and the first parallel branch, and the second connecting trace intersects the main branch and the second parallel branch.