Interlaced Inductor-Capacitor Layout for Harmonic Filtering
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Solution Overview
Problem
Conventional methods to mitigate the negative effects of harmonics in RF devices involve external filters, which can affect the circuit's functionality and incur additional costs.
Innovation Solution
An inductor device is designed with a specific configuration of traces and a capacitor, allowing high-frequency signals to pass while filtering out low-frequency signals, thereby eliminating the need for external filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an external filter is disposed outside the circuit to filter harmonics, then the negative effect of harmonics is reduced, but the circuit function is affected and additional costs are generated
Solution Approach 1:
The patent combines the filter function with the inductor device by integrating a capacitor into the inductor structure. The capacitor is coupled between the first and second traces of the inductor, forming an integrated device that provides both inductance and filtering capabilities. This merging eliminates the need for separate external filters while maintaining the inductor's original function.
Solution Approach 2:
The inductor device is designed to perform multiple functions simultaneously: it provides inductance for the RF circuit and acts as a filter for harmonics. The capacitor integrated into the inductor structure enables the device to block low-frequency harmonic signals while allowing high-frequency operating signals to pass, making the inductor a multi-functional component that reduces overall system complexity.
2Object-generated harmful factors
If a filter is disposed outside the circuit, then harmonics are filtered, but additional components increase device complexity and cost
Solution Approach 1:
The filter function is merged with the inductor by integrating a capacitor into the inductor structure. The capacitor is positioned between the first and second traces, creating an integrated device that combines inductance and filtering functions in a single component, thereby reducing the total number of discrete components required.
Solution Approach 2:
The inductor device is designed to perform multiple functions simultaneously: it provides inductance for the RF circuit and acts as a filter for harmonics. The integrated capacitor enables the device to block low-frequency harmonic signals while allowing high-frequency operating signals to pass, making the inductor a multi-functional component that reduces overall system complexity.
3Object-affected harmful factors
If the inductor device filters low frequency signals, then harmonics are reduced, but high frequency signals must pass through
Solution Approach 1:
The capacitor in the inductor device is designed with specific electrical parameters to create frequency-selective behavior. By adjusting the capacitance value and trace geometry, the device allows high-frequency operating signals to pass while blocking low-frequency harmonic signals. The interlaced wire configuration and trace dimensions are optimized to achieve the desired frequency response characteristics.
Solution Approach 2:
The inductor device exhibits dynamic frequency response characteristics where its filtering behavior changes based on signal frequency. The capacitor and trace configuration create a frequency-dependent impedance that automatically allows high-frequency signals to pass while blocking low-frequency harmonics, providing adaptive filtering without affecting the operating frequency.
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 inductor device effectively filters low-frequency signals without affecting the operating frequency, allowing high-frequency harmonics to be utilized within the circuit, thus reducing negative effects and eliminating the need for external filtering components.
Implementation Method 1
The capacitor is coupled between the first node and the second node. Therefore, based on the technical content of the present disclosure, the capacitor of the inductor device brings a function to filter low frequency, such that low frequency signal induced at the inductor device cannot pass but high frequency signal can pass the capacitor directly.
Implementation Method 2
An induced signal caused by the main operating frequency can be canceled by the folded inductor of the inductor device. If an inductor which is located at the center of the inductor device has a high frequency signal, for example, a second harmonic (e.g., 5 GHz signal), the high frequency signal may pass the capacitor and form an inductive inductor which is a circle flows through the folded inductor and the capacitor. Therefore, a 5 GHz harmonic signal corresponding to 2.4 GHz signal is induced in the inductor device of the present disclosure.
Data Source
AI summary
An inductor device includes a first trace, a second trace, and a capacitor. The first trace includes a first and a second sub-trace. The first sub-trace includes first wires, and the second sub-trace includes second wires. The second sub-trace is coupled to the first sub-trace at a first node. The first and the second wires are disposed to each other in an interlaced manner, and located at an outer side of the inductor device. The second trace includes a third and a fourth sub-trace. The third sub-trace includes third wires, and the fourth sub-trace includes fourth wires. The fourth sub-trace is coupled to the third sub-trace at a second node. The third and the fourth wires are disposed to each other in an interlaced manner, and located at an outer side of the inductor device. The capacitor is coupled between the first and the second node.