RF Bandpass Filter Cavity Resonator for Stable MR Tuning
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Solution Overview
Problem
Conventional bandpass filters for MR apparatuses are costly, require significant manual effort for setup and adjustment, are susceptible to mechanical shocks and vibrations, and exhibit temperature dependence, while existing resonators do not provide RF-tightness.
Innovation Solution
A compact RF bandpass filter with an electrically conductive coil body having a cavity, designed to minimize stray fields and maintain high electrical resistance, featuring a resonator with a fixed resonance frequency and low impedance, which can be easily manufactured as a flat module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional bandpass filters are manufactured using wound cylindrical coils and milled helical resonators in cast or milled housings on individual printed circuit boards, then the filters can be assembled with discrete components, but the manual effort required for setup and adjustment increases significantly
Solution Approach 1:
The patent merges the inductor and capacitor into a single integrated resonator component with a fixed resonance frequency, eliminating the need for separate wound coils, helical resonators, and trimming capacitors. This integration allows the filter to be assembled as a complete module without manual adjustment of individual components, resolving the contradiction between ease of assembly and manual adjustment time.
2Adaptability or versatility
If multiple coils, helical resonators, and trimming capacitors are kept in stock for filter assembly, then filter configuration options increase, but manufacturing costs increase
Solution Approach 1:
The patent achieves filter configuration versatility by changing the parameters (resonance frequencies) of the integrated resonators rather than using multiple physical component types. Different resonance frequencies are achieved through design variations of the same integrated resonator structure, eliminating the need to stock multiple coils and capacitors while maintaining cost-effectiveness.
3Device complexity
If conventional bandpass filters use discrete components interconnected with coaxial cables and connectors, then the filter structure is flexible, but the structure becomes susceptible to mechanical shocks and vibrations
Solution Approach 1:
The patent merges discrete components (coils, capacitors, connectors) into an integrated resonator assembly where components are fixed relative to each other within a single housing. This integration eliminates the mechanical connections between separate components, making the filter structure resistant to mechanical shocks and vibrations while maintaining structural flexibility through the overall modular design.
4Ease of manufacture
If conventional bandpass filters use discrete components and coaxial connections, then the filter can be assembled from standard parts, but the filter exhibits temperature dependence
Solution Approach 1:
The patent merges temperature-sensitive discrete components into a single integrated resonator unit with fixed internal connections. This integration minimizes the impact of temperature variations by eliminating multiple connection points and ensuring stable electrical characteristics throughout the assembly, thereby improving temperature stability while maintaining ease of manufacture through modular integration.
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 provides a high-quality, low-impedance filter with high electrical load capacity, suitable for MR transmission and receiving devices, and is resistant to mechanical shocks and temperature variations, reducing manufacturing costs and simplifying assembly.
Implementation Method 1
The resonator (10) comprises an inductor which comprises an electrically conductive coil body (11) having a cavity (9) and which is closed in a substantially RF-tight manner, and a capacitance which comprises at least one capacitor (1) arranged within the cavity (9)
Data Source
AI summary
The invention relates to a radio-frequency bandpass filter for an MR apparatus, in particular for a transmission and/or receiving arrangement of the MR apparatus, comprising a resonator arrangement with a signal input, a signal output and at least one resonator, wherein each resonator has a capacitor which is connected in parallel to an inductor, characterized in that the inductor comprises an electrically conductive coil body having a cavity which is closed in a substantially RF-tight manner. As a result, an RF bandpass filter of high quality, high electric load-bearing capacity and simultaneously a low impedance level is achieved which can be produced simply and at low cost.