Harmonic Suppression Resonator with Coupling Windows
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Solution Overview
Problem
Conventional waveguide filters fail to effectively suppress second harmonic components due to resonance in both fundamental and harmonic modes, leading to inefficient harmonic propagation blocking and radio wave leakage, with existing solutions either lacking in workability or reliability.
Innovation Solution
A harmonic suppression resonator design featuring coupled waveguide resonators with strategically positioned coupling windows and additional regions that magnetically and electrically couple fundamental wave modes while blocking harmonic modes, preventing propagation of unwanted harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional waveguide filters are used to allow fundamental wave propagation, then the fundamental wave can pass through, but harmonic components (especially second harmonic) also propagate due to resonance in both fundamental and harmonic modes
Solution Approach 1:
The waveguide filter is divided into multiple resonator sections (first resonator, second resonator, etc.) with different structural configurations. Each resonator is designed to resonate at the fundamental wave frequency but not at harmonic frequencies, thereby segmenting the harmonic suppression function across multiple components rather than relying on a single filter structure
Solution Approach 2:
Different regions of the filter structure are given different properties: the resonators are designed with specific dimensions and coupling configurations that create local resonance conditions for fundamental waves while preventing harmonic resonance. The coupling holes between resonators are strategically positioned and sized to achieve selective frequency transmission
2Ease of manufacture
If metallic blocks are combined to form waveguide structures, then manufacturing is easier, but radio wave leakage occurs from gaps between the combined metallic blocks
Solution Approach 1:
A partition plate is introduced as an intermediary component between the first and second metallic blocks. This partition plate not only bridges the gap between blocks but also functions as a resonator that contributes to harmonic suppression. The partition plate is coupled to both blocks through coupling holes, creating a three-component assembly that eliminates gaps while maintaining electromagnetic performance
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 design achieves a high harmonic-suppression effect by blocking unnecessary harmonic propagation while maintaining the fundamental wave's resonance frequency, thus enhancing the efficiency of high-frequency devices like radar systems.
Implementation Method 1
harmonic modes of a predetermined order of the adjoining resonators are magnetically and electrically coupled with each other via the coupling window
Implementation Method 2
harmonic modes of a predetermined order of the adjoining resonators are magnetically and electrically coupled with each other via the coupling window
Implementation Method 3
a plurality of waveguide resonators which resonate in TE mode
Implementation Method 4
an additional region whose width is no longer than a half wavelength of the fundamental wave and no shorter than a half wavelength of the harmonics
Data Source
AI summary
A harmonic suppression resonator comprises a plurality of waveguide resonators that resonate in TE mode, in which harmonic suppression resonator, adjoining resonators are coupled via a plurality of coupling windows. Four coupling windows 33bc1, 33bc2, 33bc3 and 33bc4 are provided between a resonant region 51b and a resonant region adjoining the resonant region 51b. These coupling windows allow fundamental wave modes of the adjoining resonators to be coupled mainly by magnetically coupling. The coupling windows 33bc3 and 33bc4 allow second harmonic modes of the adjoining resonators to be electrically coupled, and the coupling windows 33bc1 and 33bc2 allow the second harmonic modes of the adjoining resonators to be magnetically coupled. By causing the amount of the electrically coupling and the amount of the magnetically coupling to be substantially equal, the coupling of the second harmonic modes is negated, whereby propagation of the second harmonic is blocked.