Impedance Matching Switch Circuit Module for Wideband RF
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Solution Overview
Problem
Existing impedance matching circuits struggle to achieve low-loss transmission of high-frequency signals across a wide range of frequency bands due to limitations in fixed circuit patterns using only inductors and capacitors, requiring multiple LC resonant circuits and increased size, and complex switching mechanisms.
Innovation Solution
A modular impedance matching switch circuit module with a π-type or L-type configuration, utilizing multiple switch devices and external matching elements, allows for on/off control to change impedance characteristics, enabling wide-range impedance matching across various frequency bands with a simple and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed circuit pattern with only inductors and capacitors is used, then impedance matching can be achieved, but the frequency band is limited
Solution Approach 1:
The patent introduces switching devices that dynamically reconfigure the circuit topology between different states (L-type and π-type configurations). This dynamic switching capability allows the same physical circuit to adapt to different frequency bands and impedance requirements, transforming a static limited-band circuit into a dynamic multi-band impedance matching solution.
Solution Approach 2:
The patent designs a universal impedance matching circuit that can serve multiple frequency bands through switching between different circuit configurations. The same inductors and capacitors are reused in different topological arrangements (L-type for one band, π-type for another band), making the circuit multi-functional across wide frequency ranges without requiring separate dedicated circuits for each band.
2Adaptability or versatility
If multiple LC resonant circuits are used to support multiple bands, then frequency band coverage is improved, but device size increases
Solution Approach 1:
The patent merges multiple impedance matching functions into a single integrated circuit structure. Instead of placing separate LC resonant circuits for different bands, the patent combines them into one shared circuit with switching capability, where the same physical components (inductors and capacitors) serve multiple bands through different topological configurations, thereby reducing overall module size.
Solution Approach 2:
The switching mechanism dynamically activates different circuit paths within the same physical space. By using SPST switches to reconfigure the topology, the patent enables one physical circuit to occupy the same spatial footprint while providing impedance matching for multiple frequency bands, effectively reducing the area required compared to having separate dedicated circuits for each band.
3Adaptability or versatility
If the number of LC resonant circuits is increased to cover more bands, then frequency band support is improved, but the number of switching terminals increases
Solution Approach 1:
The patent creates a universal switching architecture where a small number of switches control access to multiple circuit configurations. The SPST switches serve multiple functions by enabling transitions between L-type and π-type configurations, and by selecting different inductor and capacitor combinations. This multi-functional switching approach reduces the total number of switching terminals needed compared to having dedicated switches for each band or circuit path.
4Manufacturing precision
If circuit constants are adjusted for each band, then impedance matching accuracy is improved, but design flexibility decreases
Solution Approach 1:
The patent employs dynamic switching to achieve band-specific impedance matching without requiring physical adjustment of circuit constants. The switching devices enable the circuit to present different topological configurations (L-type or π-type) optimized for different frequency bands, maintaining high impedance matching accuracy for each band while preserving design flexibility through electronic control rather than mechanical adjustment.
Data Source
AI summary
An impedance matching switch circuit module includes a first switch device connected to first and second high-frequency input/output terminals, a second switch device connected between the first high-frequency input/output terminal and a first matching terminal, and a third switch device connected between the second high-frequency input/output terminal and a second matching terminal. Impedance matching elements having appropriately set element values (inductances or capacitances) are connected to the first and second high-frequency input/output terminals and the first and second matching terminals, and on/off control is performed for the first, second, and third switch devices.