Composite Tuning Structure in Cavity Filters for High Q Linearity
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Solution Overview
Problem
Conventional cavity filters suffer from poor tuning capability and linearity, leading to excessive linear slope increase and degraded performance, particularly due to the continuous extension of tuning screw rods into resonant cavities.
Innovation Solution
A novel cavity filter design incorporating a tuning component with a high-conductivity and non-conductivity parts, allowing even electric field distribution and adjustable resonance, featuring a resonant column mounted on the cover plate side or bottom, with a central axis alignment and adjustable fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tuning screw rod continuously extends into the resonant cavity, then the resonance frequency can be adjusted, but the linear slope of the cavity filter increases excessively fast, degrading filter performance
Solution Approach 1:
The tuning component is divided into a high-conductivity part and a non-conductivity part. The high-conductivity part is disposed inside the resonant cavity to adjust resonance frequency, while the non-conductivity part extends outside the cavity to prevent excessive linear slope increase, thereby segmenting the tuning function to resolve the contradiction between tuning capability and linearity
Solution Approach 2:
Different parts of the tuning component have different conductivity properties: the high-conductivity part inside the cavity provides effective resonance tuning, while the non-conductivity part outside the cavity suppresses unwanted electromagnetic effects. This local differentiation of material properties allows simultaneous achievement of good tuning capability and linearity
2Ease of operation
If conventional tuning structures are used, then the filter can be adjusted, but signal radiation is not effectively suppressed and the Q value of the cavity is low
Solution Approach 1:
The tuning component uses localized high-conductivity material inside the resonant cavity to concentrate electromagnetic energy and suppress radiation losses. This localized conductivity enhancement increases the Q value of the cavity while maintaining adjustability through the non-conductivity part outside the cavity
Solution Approach 2:
The tuning component is constructed as a composite structure combining high-conductivity and non-conductivity materials. This composite design enables the component to simultaneously achieve effective signal confinement (high Q value) and mechanical adjustability, resolving the contradiction between ease of operation and energy loss
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 new design effectively suppresses signal radiation, significantly increases the Q value of a single cavity, and optimizes linearity, enhancing frequency tuning performance and reducing interference.
Implementation Method 1
The tuning component may include a high-conductivity part and a non-conductivity part
Implementation Method 2
effectively suppresses outward radiation of a signal
Implementation Method 3
A function of each cavity is equivalent to an electronic oscillation circuit. When the filter is tuned to a proper wavelength of a received signal, the oscillation circuit may be represented as a parallel oscillation circuit including an inductance part and a capacitance part
Implementation Method 4
an electric field is formed in the resonant cavity. The tuning component may move along an electric field direction, to implement a tuning function
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
This application relates to the field of communications devices, and discloses a cavity filter. The cavity filter includes: a cavity, a cover plate, a tuning component, and a resonant column, where the cover plate is connected to the cavity, and the cover plate is configured to cover the cavity to form a resonant cavity. A through hole is provided on the cover plate, and the tuning component passes through the through hole and is fastened on the cover plate. The tuning part includes a high-conductivity part and a non-conductivity part, the high-conductivity part is located in the cavity, and the resonant column is mounted in the cavity. The cavity filter disclosed in this application may effectively suppress outward radiation of a signal, greatly increase a Q value of a single cavity, and optimize linearity.