Cavity Filter RF Terminal Structure for Assembly Tolerance Absorption
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Solution Overview
Problem
Cavity filters for Massive MIMO antennas face challenges in achieving a slimmer and more compact structure with easy RF signal connection, while maintaining uniform frequency characteristics and minimizing assembly tolerances, which can lead to signal loss and performance degradation.
Innovation Solution
The design incorporates an RF connector in the thickness direction with a separable terminal section that allows lateral tension, using elastic members like beryllium copper, stainless steel, or spring steel to absorb assembly tolerances and ensure stable connections, preventing signal loss and performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cavity filter is designed with a compact structure to minimize mounting space, then the volume is reduced, but the RF signal connection becomes more difficult and assembly tolerance accumulation increases
Solution Approach 1:
The RF connector is divided into a fixed portion and a movable portion that can slide relative to each other along the thickness direction. This segmentation allows the connector to accommodate assembly tolerances while maintaining a compact overall structure, resolving the contradiction between small volume and ease of RF signal connection.
Solution Approach 2:
The movable portion of the RF connector is designed to slide dynamically along the thickness direction to absorb assembly tolerances. This dynamic adjustment mechanism enables reliable RF signal connection without increasing the overall volume of the cavity filter.
2Reliability
If the RF connector is made separable to allow relative movement and absorb assembly tolerance, then the connection reliability improves, but the device complexity increases
Solution Approach 1:
The RF connector is segmented into fixed and movable portions with a simple sliding interface. This segmentation provides reliability by allowing tolerance absorption while keeping the structure relatively simple through the straightforward sliding mechanism rather than complex adjustable components.
Solution Approach 2:
The movable portion acts as an intermediary element between the fixed connector part and the RF signal line. It mediates the connection by sliding to accommodate tolerances, improving reliability without requiring complex adjustment mechanisms.
3Length of stationary object
If the cavity filter structure is slimmed in the thickness direction to reduce size, then the mounting space is minimized, but the RF signal connection stability deteriorates
Solution Approach 1:
The movable portion slides dynamically along the thickness direction to maintain stable RF signal connection despite the slimmed overall structure. This dynamic compensation allows the cavity filter to be compact in thickness while preserving connection stability through tolerance absorption.
Solution Approach 2:
The connector design allows for parameter changes in the position of the movable portion along the thickness direction. This enables the connection stability to be maintained across varying assembly conditions while keeping the overall thickness minimized.
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 approach results in a slimmer, more compact cavity filter with stable RF connections, maintaining uniform frequency characteristics and preventing performance degradation by minimizing assembly tolerances and allowing relative movement, thus enhancing reliability and assembly efficiency.
Implementation Method 1
an elastic member (80A, 80B) which elastically supports the terminal section (40)
Implementation Method 2
A cavity-structured RF filter includes a resonator composed of a resonant rod, as a conductor, and the like, inside a box structure formed of a metallic conductor, which allows only an electromagnetic field having a natural frequency to exist therein, so that only characteristic frequencies such as ultra-high frequencies pass through the filter by resonance
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a cavity filter and, in particular, provides an advantage of preventing performance deterioration of an antenna device by efficiently absorbing an assembly tolerance which may occur due to assembly design and preventing an interruption of an electrical flow, by comprising: an RF signal connecting part provided to be spaced apart at a predetermined distance from an external member having an electrode pad formed on one surface thereof; a terminal part which electrically connects the electrode pad of the external member to the RF signal connecting part, while absorbing an assembly tolerance existing within the predetermined distance and simultaneously preventing an interruption of an electrical flow between the electrode pad and the RF signal connecting part; a dielectric body which is inserted into a terminal insertion hole so as to surround the outside of the terminal part; and an elastic member which has a portion of the edge supported by the dielectric body and which elastically supports the terminal part by means of an operation in which a hollow part is deformed in the vertical direction when an assembly force is transmitted to the terminal part supported to pass through the hollow part, wherein the terminal part comprises one terminal brought into contact with the electrode pad and the other terminal connected to the RF signal connecting part.