Band-pass filter with adjustable coupling conductors
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Solution Overview
Problem
Existing band-pass filters have a limited variable range for bandwidth change and do not allow for external Q factor adjustment, leading to deteriorated filter characteristics when bandwidth is altered.
Innovation Solution
A band-pass filter design featuring multiple resonant plates connected by coupling conductors, with adjustable second and third coupling conductors to change the coupling coefficient and external Q factor, respectively, allowing for broader bandwidth adjustment without compromising filter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a movable conductor is used to change the bandwidth of a pass band, then the bandwidth can be adjusted, but the variable range of the bandwidth is narrow and the effect of varying the bandwidth is small
Solution Approach 1:
The patent changes the physical state and position parameters of coupling conductors to achieve bandwidth adjustment. Specifically, it uses a movable coupling conductor whose position can be changed to vary the coupling coefficient between resonant elements, thereby achieving a wide variable range for bandwidth adjustment.
Solution Approach 2:
The patent introduces a movable coupling conductor that can dynamically change its position to adjust the bandwidth. This dynamic structure allows the filter to adapt to different bandwidth requirements by moving the coupling conductor to different positions, achieving significant bandwidth variation effect.
2Adaptability or versatility
If the bandwidth is changed in existing filters, then the pass band frequency is adjusted, but the filter characteristics are deteriorated due to lack of external Q factor adjustment mechanism
Solution Approach 1:
The patent simultaneously adjusts two parameters: the coupling coefficient (affecting bandwidth) and the external Q factor. By changing the position of the movable coupling conductor, both the coupling coefficient between resonant elements and the external Q factor are adjusted, maintaining filter characteristics stability while achieving bandwidth change.
Solution Approach 2:
The patent implements a control mechanism that monitors filter characteristics and adjusts the coupling conductor position to maintain optimal performance. This feedback control ensures that filter characteristics remain stable during bandwidth adjustment by compensating for any deterioration.
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
Enables easy and extensive change of bandwidth while maintaining stable filter characteristics, with the ability to adjust the external Q factor to match external circuits, enhancing the filter's adaptability and performance.
Implementation Method 1
a first coupling conductor connecting two adjacent resonant plates of the plurality of resonant plates
Implementation Method 2
a plurality of resonant plates stored in the housing
Data Source
AI summary
There is provided a band-pass filter capable of easily changing a bandwidth of a pass band. A band-pass filter (1B) of the present disclosure includes: a housing (11), a plurality of resonant plates (12) stored in the housing (11), a first coupling conductor (15) connecting two adjacent resonant plates (12) of the plurality of resonant plates (12), and a second coupling conductor (16) arranged at a position affecting a coupling coefficient between the two adjacent resonant plates (12), wherein a distance from the resonant plate (12) to the second coupling conductor (16) is changeable.