Dielectric Resonator DC-Cut Electrode Pattern
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Solution Overview
Problem
Existing dielectric resonators require a DC-cut element or signal line with a DC-cut structure on a mount board, leading to increased device size and constrained circuit design, with variations in coupling due to slight shifts in electrode positions, and fixed reflection phases limiting design flexibility.
Innovation Solution
A dielectric resonator with a line pattern on its surface, featuring an electrode gap that allows magnetic-field coupling for DC-cutting, reducing overall dimensions and enabling adjustable capacitance between input/output and ground portions, thus facilitating manufacturing and design flexibility without the need for a DC-cut element on the mount board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC-cut element or signal line with DC-cut structure is provided on a mount board, then DC-cutting function is achieved, but the size of the mount board and entire device is increased
Solution Approach 1:
The patent combines the DC-cut structure with the resonator body by providing a DC-cut electrode pattern on the bottom surface of the dielectric resonator itself, rather than requiring a separate DC-cut element on the mount board. This merging of functions reduces the overall device size while maintaining the DC-cutting capability.
Solution Approach 2:
The dielectric resonator serves its own DC-cutting function through the DC-cut electrode pattern formed on its bottom surface, eliminating the need for external DC-cut elements on the mount board. The resonator structure itself provides the necessary DC-blocking function.
2Manufacturing precision
If the relative positions of outer-surface electrode and input/output electrode are slightly shifted, then manufacturing variations occur, but the amount of coupling between dielectric resonator and input/output electrode is greatly changed
Solution Approach 1:
The input/output electrode pattern is pre-formed on the dielectric resonator during the resonator manufacturing process, ensuring precise positional alignment before the resonator is mounted on the board. This preliminary formation of the electrode pattern eliminates alignment issues that would occur with post-assembly adjustments.
Solution Approach 2:
The input/output electrode is integrated directly onto the dielectric resonator body, making the coupling between the resonator and input/output electrode inherent to the resonator structure itself. This integration eliminates sensitivity to relative position shifts between separate components.
3Reliability
If an electrode gap is provided in a main line for DC-cutting, then DC-cutting is achieved, but the phase of reflection or transmission signal is fixed according to distance from short-circuited point
Solution Approach 1:
The patent makes the electrical characteristics of the DC-cut structure adjustable by varying the width and spacing of the electrode pattern on the bottom surface. This allows the electrical length and impedance of the DC-cut structure to be optimized for different circuit designs and frequencies, providing adaptability rather than fixed characteristics.
Solution Approach 2:
The electrical characteristics of the DC-cut electrode pattern are controlled by adjusting geometric parameters such as the width, spacing, and pattern configuration of the electrode. These parameter changes allow optimization of the DC-cut structure for different circuit requirements without changing the fundamental DC-blocking function.
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 reduces the overall device size, simplifies circuit design, and allows for adjustable coupling and reflection phases, enhancing manufacturing ease and design flexibility while maintaining consistent electric characteristics across resonators.
Implementation Method 1
featuring an electrode gap that allows magnetic-field coupling for DC-cutting
Data Source
AI summary
A dielectric resonator having a line pattern that includes an electrode gap that defines a signal input/output portion provided on an open side, and a ground portion provided on a short-circuited side. The length L in a main direction of a portion of the line pattern in which the signal input/output portion and the ground portion face each other is smaller than one quarter the wavelength of a resonant signal of the resonator. A variable-capacitance element is connected to the signal input/output portion. One end of the variable-capacitance element has a positive potential and the other end of the variable-capacitance element has a negative potential.