Surface-Mount Transmission Line Capacitor for Tailored RF Response
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Solution Overview
Problem
Existing wire-bond transmission line capacitors lack the ability to tailor frequency responses over their useful frequency range, failing to meet current desirable operational requirements.
Innovation Solution
The development of a surface mount transmission line capacitor with a monolithic substrate, electrodes, a dielectric layer, and terminal layers, configured for grid array type mounting, which exhibits improved high-frequency performance by tailoring responses over the device's frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wire-bond transmission line capacitors are used for DC blocking and RF bypassing, then basic capacitive functions are achieved, but the ability to tailor frequency responses over the useful frequency range is lost
Solution Approach 1:
The patent applies local quality by creating non-uniform electrode configurations where specific regions of the electrodes have different geometries or dimensions. This allows different portions of the capacitor to contribute differently to the frequency response, enabling tailoring of the impedance characteristics across the frequency range without requiring multiple discrete components.
Solution Approach 2:
The patent utilizes parameter changes by varying physical dimensions of the electrodes (such as width, length, or spacing) to adjust the capacitive characteristics. By changing these geometric parameters during the monolithic fabrication process, the frequency response can be tailored to meet specific application requirements while maintaining a simple single-device structure.
2Reliability
If standard transmission line capacitors are used for impedance matching, then basic impedance control is achieved, but insertion loss performance at high frequencies (20-60 GHz) deteriorates
Solution Approach 1:
The patent applies dynamics by designing electrodes with varying widths or spacing along their length, creating a distributed capacitance effect. This dynamic geometric variation allows the capacitor to maintain better impedance control and lower insertion loss across the broad frequency range of 20-60 GHz, as different sections of the electrode contribute optimally at different frequencies.
Solution Approach 2:
The patent transitions from traditional two-terminal planar capacitors to a configuration where electrode geometry varies in multiple dimensions (width, length, spacing). This dimensional enhancement allows the capacitor to achieve superior high-frequency performance by distributing the capacitive effect across the extended structure, reducing parasitic effects and improving impedance matching over the 20-60 GHz range.
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 surface mount transmission line capacitor achieves an insertion loss greater than −1.0 dB for frequencies ranging from 20 GHz to 60 GHz, providing enhanced high-frequency performance and tailored frequency responses.
Implementation Method 1
a dielectric layer arranged between the first electrode and second electrode
Data Source
AI summary
A surface mount transmission line capacitor can have excellent high frequency performance characteristics. The surface mount transmission line capacitor can include a monolithic substrate having a surface, a first electrode formed over the surface, a second electrode arranged over the first electrode, a dielectric layer arranged between the first electrode and second electrode, a first terminal layer exposed along the surface of the substrate and electrically connected with the first electrode, and a second terminal layer exposed along the surface of the substrate and electrically connected with the second electrode. The first terminal layer and the second terminal layer can be contained within a perimeter of the surface of the monolithic substrate.