Dual TE22N Mode Cavity Filter Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microwave resonator filters designed for high frequency ranges face challenges in achieving high Q factors while minimizing size and weight, as higher order resonance modes like TE 22N mode result in bulkier filters, which are undesirable in telecommunications applications where size and weight are critical.
Innovation Solution
A microwave resonator filter operating in dual TE 22N mode with orthogonal field polarizations, utilizing coupling elements and irises to achieve high Q factors and complex filter functions, while maintaining a compact design through the use of cylindrical cavities and strategically placed discontinuities for mode coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher order resonance modes (TE 22N mode) are used to achieve high Q factors at high frequencies, then the filter performance is improved, but the filter size and weight increase becoming bulky
Solution Approach 1:
The patent combines two orthogonal TE 22N modes with different polarizations within a single cylindrical cavity resonator. By coupling these two modes through strategically placed irises and discontinuities, the filter achieves high Q factor performance while maintaining a compact size, as both modes share the same physical cavity space rather than requiring separate resonators
Solution Approach 2:
The invention utilizes the polarization dimension by exciting two orthogonal TE 22N modes with perpendicular field polarizations. This allows the filter to achieve complex filtering functions and high Q factors by operating in multiple dimensional spaces (different polarizations) within the same physical cavity, effectively increasing the functional capacity without proportionally increasing physical size
2Loss of energy
If higher order resonance modes are used to achieve high Q factors, then insertion loss is reduced and roll-off is steeper, but the filter becomes more complex in structure
Solution Approach 1:
The patent merges the functionality of multiple resonators into a single cylindrical cavity by coupling two orthogonal TE 22N modes. This consolidation achieves the desired insertion loss performance and steep roll-off characteristics while reducing structural complexity compared to using multiple separate high-order mode resonators
Solution Approach 2:
The single cylindrical cavity serves multiple functions by supporting and coupling two orthogonal TE 22N modes simultaneously. This multi-functional design achieves complex filter responses, low insertion loss, and steep roll-off without requiring multiple specialized resonators for each 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
The dual TE 22N mode filter achieves high Q factors at high frequency ranges, enabling compact and efficient microwave resonator designs suitable for telecommunications applications, with the ability to realize complex filter functions and transmission zeros.
Implementation Method 1
a cavity defined by an electrically conductive cylindrical enclosure in which electromagnetic energy radiated into the cavity resonates in a plurality of resonance modes comprising a dual TE 22N mode
Implementation Method 2
a discontinuity formed within the cavity configured to electromagnetically couple the first TE 22N mode with a second TE 22N mode having a second polarization orthogonal to the first polarization
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A microwave cavity filter (100) is configured for operation in the dual TE22N mode to realize a very high Q factor at very high frequency ranges. The microwave filter is formed from using one or more cylindrical cavities (60a,60b) in which two orthogonal field polarizations of the TE22N mode are excited and coupled together by means of a coupling element (78a,79b). Different combinations of inter-cavity irises (84,90) provide for both direct and cross-coupling of aligned field polarizations in adjacent cavities, as required, to realize complex filter functions. The irises may be formed in either a side or end wall of the cavities for both collinear and planar mount configuration. Negative mode coupling also allows for transmission zeros to be realized on either side of the filter passband.