Cavity Filter Structural Capacitor Connector Gap
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Solution Overview
Problem
In cavity filters, manufacturing and device errors lead to positional discrepancies between the connector inner conductor and the circuit board, causing distortion and damaging the circuit board during assembly, which affects signal transmission and increases manufacturing costs.
Innovation Solution
The connector inner conductor is divided into a first and second inner conductor with a gap between them to form a structural capacitor, allowing for capacitive coupling and compensating for height differences, ensuring reliable connection and reducing the risk of circuit board damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the connector inner conductor height is adjusted to match the assembly reference level, then good contact with the circuit board is achieved, but manufacturing errors and device errors cause positional discrepancies leading to circuit board distortion and damage
Solution Approach 1:
The inner conductor is divided into two separate segments: a first inner conductor connected to the circuit board and a second inner conductor connected to the cavity. This segmentation allows each segment to independently accommodate manufacturing tolerances and positional errors, preventing the transmission of mechanical stress to the circuit board while maintaining electrical connectivity through capacitive coupling between the segments.
2Length of stationary object
If the inner conductor height is lowered below the assembly reference level, then a gap is formed, but this causes distortion of the circuit board
Solution Approach 1:
A structural capacitor is introduced as an intermediary element between the first and second inner conductors. This capacitor serves as a mediator that bridges the gap created by height differences without requiring direct mechanical contact, thereby eliminating the distortion force on the circuit board while maintaining the electrical connection path.
3Length of stationary object
If the inner conductor height is raised above the assembly reference level, then the inner conductor lifts the circuit board, but this also causes distortion of the circuit board
Solution Approach 1:
By segmenting the inner conductor into two parts connected through a structural capacitor, the design eliminates the need for a single tall conductor that would lift the circuit board. The first conductor can remain at a lower height, connected to the circuit board without causing distortion, while the second conductor extends to the cavity connection point.
4Stability of the object's composition
If a rigid connection is used between the inner conductor and circuit board, then structural stability is achieved, but manufacturing errors cause distortion and damage to the circuit board
Solution Approach 1:
The connection parameter is changed from a rigid mechanical connection to a capacitive coupling. This parameter change transforms the connection from one that transmits mechanical forces and distortions to one that maintains electrical connectivity while isolating the circuit board from mechanical stress, thereby improving both stability and reliability.
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 solution eliminates positional errors, ensures good contact between the connector inner conductor and the circuit board, improves signal transmission reliability, and decreases manufacturing costs by utilizing the structural capacitor to adjust capacitance without affecting signal quality.
Implementation Method 1
the first inner conductor and the second inner conductor have a gap therebetween and cooperate with each other to form a structural capacitor, and the internal signal transmission point is connected with the signal transmission point on the external circuit board via the structural capacitor
Data Source
AI summary
A cavity filter is disclosed, which comprises a cavity, a cover plate, and a connector inner conductor disposed within the cavity, wherein the connector inner conductor passes through the cover plate to be connected with an external circuit board, the connector inner conductor comprises a first inner conductor and a second inner conductor, the first inner conductor is connected with a signal transmission point on the external circuit board, the second inner conductor is connected with an internal signal transmission point inside the cavity, the first inner conductor and the second inner conductor have a gap therebetween and cooperate with each other to form a structural capacitor, and the internal signal transmission point is connected with the signal transmission point on the external circuit board via the structural capacitor. A power amplifying module and a signal transceiving device are also disclosed.