Cavity Filter Terminal Elastic Deformation Tolerance Absorption

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Solution Overview

Problem

Current cavity filters for massive MIMO antennas face challenges in achieving a slimmer, more compact structure with embedded RF connectors, minimizing assembly tolerance, maintaining uniform frequency characteristics, and preventing signal loss due to separable RF pins and assembly inaccuracies.

Innovation Solution

The design incorporates an RF signal connecting portion with a terminal portion that absorbs assembly tolerance through elastic deformation, ensuring stable electrical connection by applying lateral tension and allowing relative motion, while embedding the RF connector within the filter body for a compact structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the cavity filter is designed with a slimmer and more compact structure with embedded RF connectors, then the filter size is reduced, but the assembly tolerance accumulates and connection stability deteriorates

Engineering Contradiction:

Improvefilter sizeVSAvoidassembly tolerance

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The terminal portion is designed with elastic deformation capability, transforming from a rigid static structure to a dynamic adaptive structure. The terminal can elastically deform to accommodate assembly tolerance variations while maintaining stable electrical connection, resolving the contradiction between compact size and connection stability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The terminal portion's physical state is changed from rigid to flexible through elastic deformation design. By changing the mechanical parameter (rigidity) of the terminal portion, it can adapt to assembly tolerance variations while maintaining reliable electrical connection in the compact filter structure

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If separable RF pins are used for connection, then the assembly is easier, but signal loss occurs due to connection instability

Engineering Contradiction:

Improveassembly easeVSAvoidsignal connection stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The terminal portion uses elastic deformation to create a dynamic adaptive connection that maintains stable electrical contact while allowing for assembly variations. This dynamic design ensures reliable signal transmission without the connection instability problems of traditional separable pins

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The traditional mechanical separable pin connection is replaced with an elastic terminal portion that provides continuous adaptive contact. This substitution eliminates the intermittent connection issues of separable pins while maintaining ease of assembly through the flexible terminal design

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the terminal portion is rigid for stable connection, then connection reliability is maintained, but assembly tolerance cannot be absorbed

Engineering Contradiction:

Improveconnection stabilityVSAvoidassembly tolerance absorption

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The terminal portion is designed with elastic deformation capability, transforming from a rigid static structure to a dynamic adaptive structure. This dynamic design allows the terminal to absorb assembly tolerance through elastic deformation while maintaining stable electrical connection

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The elastic terminal portion acts as a pre-designed cushioning element that anticipates and absorbs assembly tolerance variations before they affect connection stability. The elastic deformation capacity provides a buffer zone for manufacturing variations

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 results in a slimmer, more compact cavity filter with reduced assembly tolerance, stable RF signal connection, and maintained frequency characteristics, preventing performance degradation in massive MIMO antennas.

Implementation Method 1

a part of the terminal portion, positioned between the electrode pad and the RF signal connecting portion, is elastically deformed to absorb assembly tolerance existing in a terminal insertion port

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS11482803B2Cavity filter and connecting structure included therein

Publication Date: 2022.10.25 KMW INC

AI summary

The present invention relates to a cavity filter including: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein a part of the terminal portion, positioned between the electrode pad and the RF signal connecting portion, is elastically deformed to absorb assembly tolerance existing in a terminal insertion port. Therefore, the cavity filter can efficiently absorb assembly tolerance which occurs through assembly design, and prevent disconnection of an electric flow, thereby preventing degradation in performance of an antenna device.