Harmonic-Tuned Amplifier Output Circuit for Fundamental Wave Matching
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Solution Overview
Problem
Conventional amplifiers experience net loss and reduced efficiency due to impedance mismatch for fundamental waves, leading to power conversion into heat.
Innovation Solution
An amplifier design that includes a first capacitor resonating at the frequency of the second harmonic wave and a circuit with the second transmission line, first capacitor, and second capacitor resonating at the frequency of the third harmonic wave, along with an impedance matching circuit to match impedance for the fundamental wave, preventing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both a first series resonant circuit and a second series resonant circuit are connected in parallel to the output terminal of the amplifying element, then a match of the impedance for each of the second and third harmonic waves can be achieved, but there occurs a net loss in which the electric power of the fundamental wave is changed into heat and the efficiency is reduced
Solution Approach 1:
The output circuit is segmented into multiple parallel branches, each containing a resonant circuit tuned to specific harmonic frequencies (second and third harmonics). This segmentation allows each branch to independently handle specific frequency components, achieving impedance matching for harmonic waves while preventing power loss of the fundamental wave through the use of high-impedance paths for harmonics and a dedicated impedance matching circuit for the fundamental wave.
2Measurement precision
If series resonant circuits are used for impedance matching, then harmonic wave impedance can be matched, but the fundamental wave power is converted into heat
Solution Approach 1:
Different parts of the output circuit are designed with different impedance characteristics tailored to specific frequency requirements. The resonant circuits connected in parallel provide low impedance paths for second and third harmonic waves, while the impedance matching circuit provides optimized impedance for the fundamental wave. This local quality differentiation ensures that each frequency component encounters the appropriate impedance, preventing power loss of the fundamental wave while effectively matching harmonic impedances.
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 amplifier effectively prevents power loss by matching impedance for fundamental waves, enhancing efficiency and reducing heat conversion, thus maintaining signal power output.
Implementation Method 1
the first capacitor resonates at the frequency of a second harmonic wave included in the signal outputted from the amplifying element
Implementation Method 2
a circuit including the second transmission line, the first capacitor, and the second capacitor resonates at the frequency of a third harmonic wave included in the signal outputted from the amplifying element
Data Source
AI summary
An amplifier is configured in such a way that a first capacitor resonates at the frequency of a second harmonic wave included in a signal outputted from an amplifying element, a circuit including a second transmission line, the first capacitor, and a second capacitor resonates at the frequency of a third harmonic wave included in the signal outputted from the amplifying element, and also matches the impedance for a fundamental wave together with an impedance matching circuit.