Waveguide RF Attenuation Using Radiation Absorbing Material
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Solution Overview
Problem
Existing high-frequency RF choke devices, such as those used in semiconductor testing, suffer from parasitic impedance, limited applicability, and high implementation costs due to thin film processes, making them unsuitable for certain environments and devices.
Innovation Solution
A circuit assembly incorporating a waveguide/transmission line with a radiation absorbing material in close proximity to attenuate or extract DC components from high-frequency signals, using materials like carbon, graphite, carbonyl iron, metals, and ferrites to modify RF signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard surface mount components are used for RF attenuation at high frequency, then the devices can be easily mounted, but parasitic impedance increases at higher frequencies
Solution Approach 1:
The patent replaces traditional mechanical surface mount RF attenuation components with a planar integrated circuit implementation. The RF attenuation function is achieved through planar transmission line structures and resistive elements fabricated directly on the circuit board, eliminating the need for discrete surface mount components and their associated parasitic impedances.
2Reliability
If thin film processes are used to create attenuation devices, then signal attenuation can be achieved, but manufacturing cost increases and implementation becomes difficult
Solution Approach 1:
The patent changes the manufacturing parameters by using standard printed circuit board fabrication processes instead of expensive thin film deposition processes. The RF attenuation function is achieved through conventional PCB materials and techniques, including standard resistors, transmission line geometries, and soldering processes, making the implementation cost-effective and manufacturable.
3Reliability
If thin film components are used for RF choking, then DC extraction can be achieved, but the components cannot be used in all environments
Solution Approach 1:
The patent creates a universal RF choking and DC extraction solution that can be implemented in various environments using standard PCB materials and processes. The planar implementation with conventional components provides environmental robustness and versatility, allowing the same design approach to be used across different applications and operating conditions without requiring specialized thin film components.
4Reliability
If conventional RF attenuation methods are used, then signal processing can be performed, but the solution is expensive and complex to implement
Solution Approach 1:
The patent merges multiple functions (RF attenuation, RF choking, DC extraction, and signal routing) into a single integrated planar circuit structure. By combining these functions into one unified implementation on the PCB, the design eliminates the need for multiple separate components and reduces overall system complexity while maintaining full signal processing capability.
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
Provides effective signal attenuation and DC component extraction at high frequencies, offering a cost-effective solution compatible with semiconductor manufacturing and operating across R-band to W-band frequencies.
Implementation Method 1
a radiation absorbing material in contact with or in close proximity with the waveguide/transmission line, the radiation absorbing material to modify the radio frequency signal
Data Source
AI summary
A high-speed circuit assembly includes a high-speed circuit including at least one waveguide/transmission line, and a radiation absorbing material disposed in contact with or in close proximity with the waveguide/transmission line.