Electrical Filter Structure Impedance Matching
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Solution Overview
Problem
Conventional electrical filter structures face challenges in achieving good broadband characteristics and are difficult to implement with readily available technology, particularly in achieving a working impedance different from the characteristic port impedances.
Innovation Solution
An electrical filter structure with a filter core having a working impedance different from the characteristic port impedances, utilizing matching arrangements at the input and output to allow for impedance matching, enabling the use of transmission line impedances higher or lower than the working impedance for inductances and capacitances respectively, facilitating a semi-lumped implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional semi-lumped filter structure is implemented with transmission line segments, then the filter can be realized using available technology, but it is difficult to obtain good broadband characteristics
Solution Approach 1:
The patent changes the working impedance parameter of the filter core structure to a value different from the characteristic port impedances. This parameter modification enables the filter to achieve good broadband characteristics while remaining implementable with available transmission line technology, resolving the contradiction between ease of manufacture and filter performance reliability.
2Reliability
If the working impedance of the filter core structure is made different from the characteristic port impedances, then better filter characteristics are achieved, but additional matching arrangements are required
Solution Approach 1:
The patent introduces matching arrangements as intermediary components between the filter core structure and the ports. These matching arrangements facilitate impedance transformation and enable the filter core to operate at an optimized working impedance different from the port impedances, thereby achieving better filter characteristics while managing the added complexity through systematic impedance matching.
3Loss of energy
If transmission line impedances higher than the working impedance are used for inductances, then parasitic losses are reduced, but the device complexity increases
Solution Approach 1:
The patent specifies using transmission line impedances higher than the working impedance for implementing inductances in the filter core structure. This parameter choice reduces parasitic losses by minimizing the interaction between the transmission line and surrounding structures, thereby improving energy efficiency while the increased impedance is managed through the overall filter design and matching arrangements.
Data Source
AI summary
An electrical filter structure for forwarding an electrical signal from a first filter port to a second filter port in a frequency-selective manner includes a filter core structure having a working impedance, wherein the working impedance is different from a first characteristic port impedance of a first filter port, and also different from a second characteristic port impedance of a second filter port. The electrical filter structure also includes a first matching arrangement electrically coupled between the first filter port and the filter core structure and a second matching arrangement electrically coupled between the second filter port and the filter core structure.