Triple-Mode Ceramic Waveguide Resonator for Wideband Filter Coupling
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Solution Overview
Problem
Existing multi-mode ceramic waveguide (CWG) filters have limited bandwidth, poor harmonic performance, and challenging coupling methods, which hinder their application in wideband radios, and they struggle to balance high Q-factor with small size and flexible transmission zero settings.
Innovation Solution
A triple-mode resonator with a cuboid shape and specific coupling apertures that allow independent excitation of three dominant resonance modes, combined with single-mode resonators to form a waveguide filter, enabling improved Q-factor, flexible coupling, and enhanced harmonic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-mode CWG filter is used to increase Q-factor, then the value of Q-factor is improved, but the size of the cavity has to be increased which goes against reduction in size
Solution Approach 1:
The patent combines multiple resonance modes (TE101, TE201, TE011) within a single CWG resonator cavity to achieve high Q-factor without increasing cavity size. This multi-mode approach integrates the functions of what would traditionally require multiple separate single-mode resonators, resolving the contradiction between achieving high Q-factor and maintaining compact size.
2Volume of stationary object
If existing multi-mode CWG filters are used, then size is reduced compared to single-mode filters, but the bandwidth is limited and cannot be applied to wideband radio
Solution Approach 1:
The patent employs adjustable coupling apertures with variable sizes and positions that can be tuned to dynamically adjust the coupling coefficients between resonators. This enables the filter bandwidth to be adaptively controlled, allowing the same compact multi-mode structure to serve both narrowband and wideband applications, thus resolving the contradiction between size reduction and bandwidth adaptability.
3Ease of manufacture
If blind holes or grooves are used for negative/capacitive coupling in single-mode CWG filters, then coupling is realized, but the coupling method is neither convenient for multi-mode coupling nor handy in coupling value control, and harmonic performance is very bad
Solution Approach 1:
The patent changes the coupling mechanism from blind holes/grooves to adjustable coupling apertures with variable geometric parameters (size, shape, position, orientation). This allows continuous adjustment of coupling coefficients and enables optimization of harmonic performance by selecting appropriate aperture configurations, while maintaining ease of manufacture through standard fabrication techniques. The parameter variability resolves the contradiction between ease of implementation and performance quality.
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 achieves improved Q-factor, reduced insertion loss, high power capacity, and flexible coupling, allowing for better near-band attenuation and simplified design, suitable for integration in 5G radio systems.
Implementation Method 1
A resonator comprises a main body made of a dielectric material... Ceramic property of high permittivity reduces the guide wavelength
Implementation Method 2
desired three dominant resonance modes can be excited independently in the resonator by an input signal introduced therethrough
Data Source
AI summary
The present disclosure relates to a triple-mode resonator, comprising: a main body made of a dielectric material and having a cuboid shape defining three orthogonal axes (x, y, z) substantially aligned with faces of the main body; and a conductive coating covering all of the main body except portions of the faces of the main body which defines at least one coupling aperture through which a signal can be coupled into and/or out of the main body, wherein the coupling aperture has a closed shape comprising a first and a second main edges extending along two of the axes respectively and a third main edge extending neither parallel nor perpendicular to the first and second main edges, the general shape and size and location of the coupling aperture is mainly determined by the first, second and third main edges, and the coupling aperture is configured in such a manner that desired three dominant resonance modes can be excited independently in the resonator by an input signal introduced therethrough.