Threadless Tuning Elements for Coaxial Resonators
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Solution Overview
Problem
Existing high-frequency filters require complex and costly threaded connections for tuning, which are difficult to automate and can lead to metallic abrasion causing passive intermodulation issues.
Innovation Solution
A coaxial high-frequency filter design with a threadless tuning element that uses an axially displaceable tuning element within the inner conductor bore, secured by an adhesive connection after adjustment, eliminating the need for threads and reducing metallic abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded connections are used for tuning elements, then secure mechanical fixation is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the threaded connection structure from the tuning element assembly. Instead of using threads to secure the tuning element to the resonator, the invention employs a simple push-fit arrangement where the tuning element is inserted directly into the resonator bore, eliminating the complex threaded interface while maintaining secure mechanical fixation.
Solution Approach 2:
The patent divides the resonator structure into separate components: the resonator body with a bore and the separate tuning element. The tuning element can be independently inserted and adjusted within the bore, allowing for simplified assembly and disassembly without requiring threaded connections, thereby reducing device complexity.
2Adaptability or versatility
If threaded connections are used for tuning elements, then adjustable tuning is achieved, but manufacturing automation becomes difficult
Solution Approach 1:
The patent eliminates the threaded connection component from the tuning mechanism, replacing it with a direct push-fit arrangement. This simplification allows tuning elements to be automatically inserted and positioned by robotic assembly systems without requiring complex threading operations, significantly improving manufacturing automation capability while preserving full tuning adjustability.
3Reliability
If threaded connections are used for tuning elements, then mechanical connection is achieved, but metallic abrasion occurs causing passive intermodulation
Solution Approach 1:
The patent removes the threaded interface between the tuning element and resonator, eliminating the source of metallic abrasion. The tuning element is instead inserted directly into the resonator bore without threads, preventing metal-to-metal contact and friction that would otherwise generate passive intermodulation products, while still achieving secure mechanical connection through the push-fit arrangement.
4Reliability
If precise thread matching is required, then secure connection is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates the threaded connection system entirely, replacing it with a push-fit arrangement where the tuning element is inserted into the resonator bore. This design tolerates greater dimensional variations and does not require precise thread matching, significantly reducing manufacturing precision requirements while maintaining secure mechanical connection through the interference fit of the push-fit interface.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The invention relates to a high-frequency filter (1) with a coaxial design, comprising at least one resonator (2) with a first inner conductor (3) and with an outer conductor housing (4). The outer conductor housing (4) comprises a housing base (5), a housing cover which is arranged at a distance from the housing base (6), and a peripheral housing wall (14) between the housing base (5) and the housing cover (6). The first inner conductor (3) is galvanically connected to the housing base (5) and extends axially from the housing base (5) in the direction of the housing cover (6). The resonator (2) comprises a second internal conductor (7) which is galvanically connected to the housing cover (6) and extends axially from the housing cover (6) in the direction of the housing base (5). The first and/or second inner conductor (3, 7) has an inner conductor bore (8, 25 15), and a tuning element (9) is arranged in one inner conductor bore (8, 15) in a thread-free axially movable manner. The tuning element (9) is arranged in a sleeve or bushing (31) and optionally or in addition thereto has an enlarged elastic region.