Adjustable Coupling Device Tuner for RF Isolation
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Solution Overview
Problem
Existing coupling devices in base stations face challenges in achieving precise isolation and coupling specifications due to machining accuracy and assembly errors, leading to complex and unreliable tuning processes, high failure rates, and increased production costs, especially under varying temperature conditions.
Innovation Solution
An adjustable coupling device featuring a coaxial transmission line with a coupling cavity and a tuner that moves within the cavity to adjust the electromagnetic field, allowing for simple tuning and stable connections, eliminating the need for complex adjustable circuits and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adjustable circuits are added to compensate for machining and assembly errors, then the coupling and isolation specifications can be achieved, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent pre-compensates for machining and assembly errors by designing the coupling cavity and tuner with built-in adjustment capabilities. The tuner is positioned to make preliminary adjustments to the coupling sheet-metal main rod, compensating for expected variations before the device enters service, thereby avoiding the need for complex adjustable circuits while maintaining specification compliance.
Solution Approach 2:
The patent extracts the adjustable circuits from the system by using a mechanical tuner-based adjustment mechanism instead. This removes the unreliable electronic adjustable components while preserving the ability to compensate for manufacturing tolerances through purely mechanical means.
2Manufacturing precision
If adjustable circuits are added to achieve required specifications, then the coupling and isolation performance can be tuned, but the production cost increases
Solution Approach 1:
The patent replaces expensive adjustable circuits with a simple, inexpensive mechanical tuner structure. The tuner consists of basic mechanical components that are much cheaper than electronic adjustable circuits, reducing raw material costs and production costs while maintaining the ability to achieve required specifications.
Solution Approach 2:
The device includes built-in tuner mechanisms that enable self-adjustment during assembly or maintenance without requiring external testing equipment or complex calibration procedures. This self-service capability reduces production costs by eliminating the need for expensive adjustable circuits and complex quality control processes.
3Manufacturing precision
If the coupling sheet rotates to adjust coupling amount and signal phase, then the coupling performance can be optimized, but the connection stability decreases
Solution Approach 1:
The patent pre-positions the coupling sheet and main rod at optimal orientations during assembly, eliminating the need for rotation during operation. The coupling cavity and tuner are designed to achieve the required coupling amount and signal phase through fixed mechanical positioning rather than dynamic rotation, thereby maintaining connection stability.
Solution Approach 2:
Instead of rotating the coupling sheet to adjust performance parameters, the patent inverts the approach by using the tuner to adjust the main rod's position and orientation. This alternative adjustment method maintains the coupling sheet's stable connection while achieving the desired coupling amount and signal phase through the tuner's mechanical adjustments.
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 provides improved reliability and ease of tuning, achieving optimal isolation and coupling performance with minimal impact on the coupling output, thus reducing failure rates and manufacturing complexity, making it suitable for mass production.
Implementation Method 1
a tuner, disposed through the printed circuit board, wherein a lower end of the tuner extends into the coupling cavity and the tuner can be moved up and down so as to change the depth thereof extended within the coupling cavity
Implementation Method 2
a coupling body configured to sample the signals through coupling
Data Source
AI summary
The present disclosure relates to the field of communication technologies, and more particularly, to an adjustable coupling device and a radio frequency communication device. The adjustable coupling device includes a coaxial transmission line for transmitting signals across the two terminals thereof and a coupling body for sampling the signals via coupling. The adjustable coupling device further includes a coupling cavity formed on the outer surface of the coaxial transmission line; a printed circuit board on which the coupling body is disposed, the printed circuit board capping the coupling cavity to seal the coupling body within the coupling cavity; a tuner, disposed through the printed circuit board, where the lower end of the tuner extends into the coupling cavity, and the tuner can be moved up and down to change the depth thereof extended into the coupling body so as to change the electromagnetic field distribution within the coupling cavity. In this way, the present disclosure has a simple structure and thus eliminates the influence on the coupling device derived from the structure and the machining accuracy and assembly techniques of printed circuit board, with simple tuning means and high reliability.