Parallel Positive-Negative Resonant Circuit for Wideband Filtering
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Solution Overview
Problem
The increasing demand for higher performance and reduced footprint in wireless devices poses challenges in filtering demands across various frequency bands, particularly in providing wide-bandwidth signal filters that effectively manage impedance characteristics across a wide range of frequencies.
Innovation Solution
A wide-bandwidth resonant circuit is designed by coupling a positive resonant circuit in parallel with a negative resonant circuit, utilizing an inductor network to provide equivalent negative capacitance and inductance, allowing the circuit to exhibit specific impedance characteristics across a wide bandwidth, supporting applications like wide-bandwidth signal filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional resonant circuit is used, then the circuit structure is simple, but the bandwidth is limited and cannot meet wide-bandwidth filtering requirements
Solution Approach 1:
The resonant circuit is segmented into two independent parallel branches: a positive resonant circuit and a negative resonant circuit. Each branch operates at the same resonance frequency but provides opposite impedance characteristics, allowing the combined circuit to achieve wide bandwidth while maintaining relatively simple individual circuit structures
Solution Approach 2:
The patent combines two不同类型的 resonant circuits (positive and negative) with opposite impedance characteristics to create a composite resonant system. This composite structure leverages the complementary properties of both circuits to achieve wide bandwidth performance that neither circuit could provide alone
2Adaptability or versatility
If the resonant frequency is fixed, then the circuit design is simple, but the frequency adaptability is limited
Solution Approach 1:
The parallel resonant circuit structure serves multiple functions simultaneously: it provides frequency-selective filtering, achieves wide bandwidth operation, and maintains a relatively simple configuration. Both the positive and negative resonant circuits share the same resonance frequency and parallel topology, enabling the system to handle multiple frequency-related functions with a unified design
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 wide-bandwidth resonant circuit effectively presents lower impedance below and higher impedance above the resonance frequency, enabling efficient signal filtering and supporting various wide-bandwidth applications such as band-pass and band-stop filters, thereby addressing the filtering demands in wireless devices.
Implementation Method 1
The positive resonant circuit is configured to resonate at a resonance frequency to present a respective lower impedance between the first node and the second node below the resonance frequency
Implementation Method 2
The negative resonant circuit is configured to resonate at the resonance frequency to present a respective lower impedance between the first node and the second node above the resonance frequency
Data Source
AI summary
A wide-bandwidth resonant circuit is provided. In an embodiment disclosed herein, the wide-bandwidth resonant circuit includes a positive resonant circuit coupled in parallel to a negative resonant circuit. The positive resonant circuit and the negative resonant circuit can be configured to collectively exhibit certain impedance characteristics across a wide bandwidth. As a result, it is possible to utilize the wide-bandwidth resonant circuit to support a variety of wide-bandwidth applications, such as in a wide-bandwidth signal filter circuit.