Monoblock RF Resonator with Bottom Surface Grounding
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Solution Overview
Problem
Existing RF signal filters with input/output contacts on side surfaces have limited attenuation in the stopband due to asymmetrical excitation and indirect grounding, leading to undesirable waveguide propagations and performance issues at higher frequencies.
Innovation Solution
The RF resonator/filter device features input/output contacts on the bottom surface, with through-holes oriented normal to the mounting board, allowing direct ground coupling and symmetrical grounding, enhancing attenuation in the stopband by capacitive coupling through conductive transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If input/output contacts are located on side surfaces for direct surface mounting, then ease of operation is improved, but attenuation in the stopband deteriorates due to asymmetrical excitation
Solution Approach 1:
The patent inverts the conventional location of input/output contacts from side surfaces to the bottom surface of the filter assembly. This inversion allows the through-holes to be oriented normal to the mounting board, achieving symmetrical excitation and improved stopband attenuation while maintaining ease of surface mounting operation.
2Ease of operation
If through-holes are oriented parallel to the mounting board for direct surface mounting, then ease of operation is improved, but attenuation in the stopband deteriorates due to indirect grounding
Solution Approach 1:
The patent inverts the orientation of through-holes from parallel to the mounting board to normal (perpendicular) to the mounting board. This inversion enables direct grounding of resonators to the mounting board through the bottom surface, achieving symmetrical excitation and improved stopband attenuation while maintaining ease of surface mounting.
3Device complexity
If input/output contacts are on side surfaces, then device complexity is reduced, but unwanted signal propagation increases due to asymmetrical excitation
Solution Approach 1:
The patent inverts the contact location from side surfaces to bottom surface and orients through-holes normal to the mounting board. This configuration achieves symmetrical excitation that suppresses unwanted waveguide propagations above the passband, reducing harmful effects without significantly increasing device complexity.
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 configuration improves attenuation in the stopband and reduces unwanted signal propagation, resulting in better frequency response characteristics, particularly at frequencies above the passband.
Implementation Method 1
Means are defined on the bottom surface of the block of dielectric material for capacitively electrically coupling the resonator device to the board or substrate
Data Source
AI summary
A resonator/filter adapted for direct surface mounting to the surface of a printed circuit board. The resonator/filter comprises a block of dielectric material including at least one resonator through-hole extending therethrough and respective top, bottom and side surfaces defining respective regions of dielectric material covered with conductive material. The top block surface defines at least a first conductive region. A second conductive region on the bottom surface of the block defines an input/output contact which allows the filter to be mounted on the board with the bottom filter surface seated thereon, thus providing a direct ground contact between the board and the resonator through-hole for improved attenuation performance particularly at higher frequencies. A plurality of transmission line embodiments electrically interconnect the first and second conductive regions.