High-Frequency Matching Circuit With Shared LC Resonance
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Solution Overview
Problem
Conventional antenna matching circuits with numerous reactance elements lead to inappropriate impedance matching and potential transmission characteristic deterioration due to the complexity of elements.
Innovation Solution
A high frequency circuit design that includes a power amplifier connected to a matching circuit with series-connected inductors and capacitors, along with switches to form LC resonant circuits, allowing for reduced element count while improving transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna matching circuits use multiple reactance elements connected in series and parallel, then impedance matching can be achieved, but the number of elements increases and transmission characteristics deteriorate
Solution Approach 1:
The patent combines series and shunt reactance elements into a unified LC resonant circuit structure. The capacitor is shared between series and shunt connections, merging multiple functions into fewer elements. This reduces the total number of reactance elements while maintaining impedance matching capability across different frequency bands.
Solution Approach 2:
The capacitor in the LC resonant circuit serves multiple functions simultaneously - it acts as both a series reactance element and a shunt reactance element depending on the switching state. This multi-functionality allows a single element to replace what would traditionally require multiple separate elements, reducing overall circuit complexity.
2Device complexity
If the number of reactance elements is reduced, then device complexity decreases, but appropriate impedance matching cannot be achieved
Solution Approach 1:
The patent employs switching elements to dynamically reconfigure the LC resonant circuit between different connection states (series and shunt). This dynamic switching allows the circuit to adapt its impedance characteristics to match different frequency bands and operating conditions, maintaining effective impedance matching with fewer static elements.
Solution Approach 2:
By changing the connection state of the capacitor through switching, the circuit parameters (impedance, resonant frequency) are dynamically adjusted. This allows the same physical elements to provide different electrical characteristics suitable for different frequency bands, achieving appropriate impedance matching without increasing element count.
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 both a reduction in the number of elements and enhanced transmission characteristics by utilizing shared capacitors for series and shunt connections, enabling efficient harmonic wave attenuation and impedance matching.
Implementation Method 1
a first inductor connected in series to an output transmission path of the power amplifier, a first capacitor connected in series to and between an end of the first inductor and ground, a second inductor connected in series to and between the first capacitor and the ground
Data Source
AI summary
A high frequency circuit includes a power amplifier and a matching circuit connected to an output terminal of the power amplifier. The matching circuit includes an inductor connected in series to an output transmission path of the power amplifier, a capacitor connected in series to and between one end of the inductor and the ground, an inductor connected in series to and between the capacitor and the ground, a switch having a common terminal, a selection terminal, and a selection terminal, a capacitor connected in series to and between the common terminal and the one end of the inductor. The selection terminal is connected to the ground, and the selection terminal is connected to the other end of the inductor.