Parallel Resonance Circuit Layout for Higher Out-of-Band Rejection
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Solution Overview
Problem
Existing capacitor-inductor parallel resonance circuits face difficulty in achieving higher out-of-band rejection at a frequency position near the transmission zero point due to limitations in making larger capacitors.
Innovation Solution
A resonance circuit design where at least one port is not connected to a capacitor element, allowing for the formation of parallel branches with inductor elements, enabling higher out-of-band rejection without increasing capacitor size or maintaining rejection with reduced capacitor values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor size is increased to achieve higher out-of-band rejection at frequency positions near the transmission zero point, then the out-of-band rejection is improved, but the device size and manufacturing complexity increase
Solution Approach 1:
The resonance circuit is divided into multiple parallel branches, where at least one branch does not contain a capacitor element. This segmentation allows the circuit to achieve higher out-of-band rejection through the combined effect of multiple branches with different impedance characteristics, rather than relying on a single large capacitor
Solution Approach 2:
The patent embeds the resonance unit with multiple parallel branches within the overall resonance circuit structure. The nested branch configuration allows smaller capacitor elements to work together in a hierarchical arrangement to achieve the same or better rejection performance that would otherwise require a single large capacitor
2Reliability
If the capacitor size is increased to achieve higher out-of-band rejection at frequency positions near the transmission zero point, then the out-of-band rejection is improved, but the manufacturing difficulty increases
Solution Approach 1:
By segmenting the resonance circuit into multiple parallel branches with different capacitor configurations, the patent enables standard manufacturing processes to be used for each branch. This avoids the need to manufacture single large-capacitor components, which are more difficult and costly to produce
Solution Approach 2:
The patent changes the circuit topology parameters by introducing branches without capacitors and varying the number and arrangement of capacitor elements in different branches. This parameter change allows the use of standard, easily manufacturable capacitor values while achieving high rejection through the overall circuit configuration rather than individual component size
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 design achieves higher out-of-band rejection at the transmission zero point frequency with the same or reduced capacitor values, enhancing performance in miniaturized precision instruments.
Implementation Method 1
the resonance unit comprises at least one inductor element and at least one capacitor element, and the inductor element is connected to the capacitor element
Data Source
AI summary
A resonance circuit and a filtering device, which relate to the technical field of electronic devices. The resonance circuit includes: a connection port, wherein the connection port includes a first port and a second port; and a resonance unit, wherein the resonance unit includes at least one inductor element and at least one capacitor element, and the inductor element is connected to the capacitor element. The first port and the second port are respectively connected to the resonance unit, so as to form at least two branches which are connected in parallel, and at least one of the first port and the second port is not connected to any of the capacitor elements.