Slim Cavity Filter Structure for Uniform PCB Antenna Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cavity filters for Massive MIMO antennas are bulky and difficult to assemble, leading to increased size and variability in frequency characteristics when mounted in base station antennas.
Innovation Solution
A slim and compact cavity filter design with an RF connector in the thickness direction, featuring a terminal unit with an elastic connector and dielectric bush for stable RF connections, and an assembly method that minimizes assembly tolerances and maintains uniform frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional cavity filter structure is used, then the filter provides stable frequency characteristics, but the filter size is large and assembly is difficult
Solution Approach 1:
The cavity filter is divided into multiple modular units, each containing a resonant element and associated terminal units. These modular units can be independently manufactured and then assembled together, reducing the overall complexity of assembly while maintaining the filter's functional integrity and frequency characteristics.
Solution Approach 2:
Terminal units are configured to extend in the thickness direction of the cavity filter body, allowing RF connectors to be positioned vertically rather than only laterally. This dimensional reorganization reduces the filter's footprint area while maintaining electrical connection functionality, and simplifies assembly by enabling vertical mounting configurations.
2Reliability
If multiple cavity filters are assembled in base station antennas, then filter functionality is achieved, but cumulative assembly tolerances cause variability in frequency characteristics
Solution Approach 1:
Terminal units are pre-assembled and pre-positioned within each modular filter unit before final assembly into the base station antenna. This preliminary assembly ensures that critical electrical connections and spacing are established with controlled tolerances at the module level, preventing tolerance accumulation when multiple filters are assembled together.
Solution Approach 2:
The design specifies precise geometric parameters for terminal unit positioning, insertion depths, and spacing between modular units. By controlling these dimensional parameters and maintaining tight tolerances on critical dimensions, the design ensures uniform frequency characteristics across multiple assembled filters while minimizing the impact of cumulative tolerances.
3Volume of moving object
If a compact cavity filter design is implemented, then antenna system size is reduced, but assembly complexity increases
Solution Approach 1:
The compact cavity filter is segmented into standardized modular units with consistent interface configurations. This segmentation allows complex compact designs to be built from simpler, identical modules, reducing assembly complexity despite the compact overall form factor.
Solution Approach 2:
Terminal units are designed with universal mounting configurations that can accommodate different mounting orientations and positions. The terminal units serve multiple functions including electrical connection, mechanical support, and alignment reference, which simplifies the overall assembly process despite the compact design constraints.
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 solution reduces the size of antenna systems, allows for rapid and reproducible verification of individual filters, and facilitates easy mounting of multiple filters in base station antennas, maintaining consistent frequency characteristics.
Implementation Method 1
a resonator, which is composed of a resonant rod as a conductor, and the like, inside a box structure made of a metallic conductor, so that only an electromagnetic field having a natural frequency exists so as to allow only a characteristic frequency of ultra-high frequencies to pass through the filter by resonance
Implementation Method 2
a terminal body through which the pin member passes, and which is installed together with the pin member in the terminal insertion hole, the terminal body having an elastic member accommodated therein to apply an elastic force to the pin member
Data Source
AI summary
A cavity filter comprising: a resonance element including a coupling block; a first case and a second case housing the resonance element; a terminal unit penetrating the first case to be connected to an electrode pad of a PCB provided on the outside of the first case and the other end thereof is electrically connected to the coupling block of the resonance element; and an assembly unit provided on either one side or both sides of the case, and having a terminal insertion hole in which the terminal unit is insertedly provided, wherein the assembly unit is formed to protrude to the outside from a lower surface of the first case. the assembly unit provide a height between the first casing and PCB so the cavity filter avoid interference with the devices mounted on the PCB.