Polarized Waveguide Filter With Independent TE10 and TE20 Tuning
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Solution Overview
Problem
The existing polarized waveguide filters face challenges in independently adjusting the resonance frequencies of the TE10 and TE20 modes, making it difficult to create an attenuation pole at a desired frequency and achieve desired pass characteristics.
Innovation Solution
The polarized waveguide filter incorporates a rectangular cavity resonator with narrower second wall surfaces and protrusions on the first wall surfaces to shift the resonance frequencies of the TE10 and TE20 modes by different amounts, allowing for independent adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the dimensions of the rectangular cavity resonator are changed to adjust the resonance frequency of the TE20 mode, then the resonance frequency of the TE20 mode is shifted, but the resonance frequency of the TE10 mode shifts by substantially the same amount, making it difficult to independently adjust the two modes
Solution Approach 1:
The invention divides the adjustment mechanism into two independent parts: one for controlling TE10 mode frequency (via cavity dimensions) and another for controlling TE20 mode frequency (via protrusions on specific wall surfaces). This segmentation allows each mode's resonance frequency to be adjusted independently without affecting the other mode's frequency to the same extent.
Solution Approach 2:
The invention applies different structural modifications to different parts of the cavity resonator. Specifically, protrusions are added only to certain wall surfaces (first, third, fifth, or seventh wall surfaces) rather than uniformly modifying all surfaces. This local modification approach enables selective influence on the TE20 mode while maintaining TE10 mode frequency control through overall dimension adjustments.
2Ease of operation
If the relative position of the rectangular cavity resonator to the waveguide or to another rectangular cavity resonator is adjusted to change the attenuation pole frequency, then the attenuation pole frequency is shifted, but the resonance frequency of the TE20 mode is also slightly changed, influencing pass characteristics
Solution Approach 1:
The invention makes the cavity resonator structure dynamically adjustable by incorporating protrusions that can be added or removed from specific wall surfaces. This dynamic configuration allows the resonance frequency of the TE20 mode to be precisely tuned to create attenuation poles at desired frequencies, while the TE10 mode frequency remains stable due to unchanged overall cavity dimensions.
Solution Approach 2:
The invention changes specific geometric parameters (adding protrusions to wall surfaces) to independently control the TE20 mode resonance frequency. This parameter modification approach allows precise control over attenuation pole frequency without requiring changes to the overall cavity dimensions that would affect the TE10 mode and pass characteristics.
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 enables the polarized waveguide filter to achieve distinct shifts in the resonance frequencies of the TE10 and TE20 modes, facilitating the creation of attenuation poles at desired frequencies and optimizing pass characteristics.
Implementation Method 1
a rectangular cavity resonator to excite a TE10 mode and a TE20 mode of an electromagnetic wave
Data Source
AI summary
A polarized waveguide filter is formed in which the polarized waveguide filter includes a first rectangular waveguide; a second rectangular waveguide; and a rectangular cavity resonator that has a first edge surface connected to an electromagnetic wave exit plane of the first rectangular waveguide via a coupling unit, and has a second edge surface facing the first edge surface and connected to an electromagnetic wave incident plane of the second rectangular waveguide via a coupling unit, and excites each of a TE10 mode and a TE20 mode of an electromagnetic wave, and the rectangular cavity resonator has two first wall surfaces and two second wall surfaces narrower in area than the first wall surfaces, and a protrusion that shifts a resonance frequency of the TE10 mode and a resonance frequency of the TE20 mode by respective amounts different from each other is provided on at least one of the two first wall surfaces, in such a way as to protrude outward from the rectangular cavity resonator.