Dielectric Resonator Filtering Device With Electrode-Free Portions
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Solution Overview
Problem
Filtering devices with dielectric resonant elements face challenges in adapting to higher frequency bands due to size reduction requirements, which complicates the formation of circuit elements and adjustment of filter characteristics, leading to increased susceptibility to external influences.
Innovation Solution
A filtering device configuration that includes a dielectric resonant element with a λ/2 resonator design, featuring electrode-free portions to prevent short-circuiting and allow for adjustable resonator length, coupled with a shield member to protect against external influences, enabling flexible adjustment of filter characteristics and resistance to higher frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dielectric resonant element is reduced in size to adapt to higher frequency bands, then the filtering device can be adapted to higher frequency bands, but it becomes difficult to form circuit elements and adjust filter characteristics
Solution Approach 1:
The invention divides the resonant element into two separate components: a dielectric resonator and a terminal. The terminal is inserted into a through-hole of the dielectric resonator, allowing independent optimization of each component. This segmentation enables the dielectric resonator to be miniaturized for high frequency adaptation while the terminal can be designed with appropriate dimensions for forming circuit elements and adjusting filter characteristics, thus resolving the contradiction between size reduction and ease of manufacture.
2Adaptability or versatility
If the dielectric resonant element is reduced in size to adapt to higher frequency bands, then the filtering device can be adapted to higher frequency bands, but the adjustment of filter characteristics becomes difficult
Solution Approach 1:
The invention makes the terminal insertable and removable from the dielectric resonator through a through-hole. This dynamic connection allows the terminal to be adjusted in position or replaced to change filter characteristics, while the dielectric resonator itself remains miniaturized for high frequency operation. The adjustable terminal provides the necessary flexibility for filter characteristic adjustment without requiring the entire resonant element to be large.
3Adaptability or versatility
If the dielectric resonant element is reduced in size to adapt to higher frequency bands, then the filtering device can be adapted to higher frequency bands, but resistance to external influences decreases
Solution Approach 1:
The invention places the terminal inside a through-hole of the dielectric resonator, creating a nested structure where the terminal is surrounded and protected by the dielectric material. This nesting provides shielding effect, protecting the terminal and the filter characteristics from external electromagnetic influences, while allowing the overall structure to remain compact for high frequency band adaptation.
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 λ/2 resonator design allows for larger dielectric blocks, increased coupling capacitance, and higher Q factors, facilitating the formation of circuit elements in a general configuration while maintaining resistance to external influences, thus easily adapting to higher frequency bands without significant design changes.
Implementation Method 1
A dielectric resonant element includes a dielectric block having a through hole, an outer conductor disposed on the outer surface of the dielectric block, and an inner conductor disposed on the inner surface of the through hole. A dielectric resonant element constitutes a λ/4 resonator, in which the inner conductor and the outer conductor are separated from each other at one end of the through hole and short-circuited at the other end of the through hole
Implementation Method 2
a capacitor element having a first electrode that is in contact with the terminal and a second electrode that is in contact with the outer conductor
Data Source
AI summary
A filtering device includes at least one dielectric resonant element, which includes a dielectric block, an outer conductor, and an inner conductor, a terminal disposed in a through hole of the dielectric resonant element from a front surface, a plate-shaped circuit element electrically coupled with the at least one dielectric resonant element via the terminal, and a substrate on which the at last one dielectric resonant element and the plate-shaped circuit element are mounted. The outer conductor is disposed so as to cover the back surface besides the peripheral surface of the dielectric block. The first end surface of the dielectric block includes a first electrode-free portion that electrically isolates the inner conductor from the outer conductor, and a second electrode-free portion that electrically isolates the inner conductor from the outer conductor.