High-Frequency Circuit Coupling Line for Stable Gain
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Solution Overview
Problem
Existing high frequency circuits face instability and characteristic deterioration when a stabilizing circuit is directly connected to the transmission line, affecting the operation and performance of the circuit.
Innovation Solution
A high frequency circuit design that includes a transistor with input and output electrodes, a transmission line, a coupling line for electromagnetic field coupling, and a resonance circuit connected between the coupling line and a reference potential, which minimizes impedance at resonance frequency to stabilize operation and suppress characteristic deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stabilizing circuit is directly connected to the transmission line, then the operation stability is improved, but the characteristic deterioration occurs and gain is lost
Solution Approach 1:
The patent introduces a coupling line as an intermediary element between the transmission line and the stabilizing circuit. The coupling line is electrically separated from the transmission line but enables electromagnetic field coupling, allowing the stabilizing circuit to be connected indirectly. This intermediary structure provides a path for stabilizing the operation while preventing direct connection that would cause characteristic deterioration and gain loss.
2Reliability
If a stabilizing circuit is directly connected to the transmission line, then the operation stability is improved, but the device complexity increases
Solution Approach 1:
The coupling line serves as a simple intermediary structure that enables indirect connection between the transmission line and stabilizing circuit. This approach achieves operation stability without requiring complex circuit modifications or additional components, thereby maintaining device simplicity while improving reliability.
3Object-generated harmful factors
If the coupling line is electrically separated from the transmission line, then the characteristic deterioration is suppressed, but the electromagnetic field coupling must be maintained
Solution Approach 1:
The coupling line is designed as an intermediary structure that is electrically separated from the transmission line yet maintains electromagnetic field coupling. This separation prevents direct interference and characteristic deterioration while the electromagnetic coupling mechanism ensures proper signal interaction, achieving both isolation and functionality.
Solution Approach 2:
The patent replaces direct electrical connection with electromagnetic field coupling. Instead of using a physically connected stabilizing circuit that would cause interference, the invention uses electromagnetic field interaction through the coupling line to achieve the same stabilizing effect without mechanical/electrical contact, thereby preventing characteristic deterioration.
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 solution effectively stabilizes the high frequency circuit operation, suppresses characteristic deterioration, and maintains gain by ensuring a stability coefficient greater than 1 within the operating frequency band, while preventing high frequency signal leakage through the resonance circuit.
Implementation Method 1
a coupling line electrically separated from the transmission line to an extent that an electromagnetic field coupling is enabled with the transmission line
Implementation Method 2
a resonance circuit that is connected between a first end of the coupling line and a reference potential, and minimizes an impedance between the first end and the reference potential at a resonance frequency
Data Source
AI summary
A high frequency circuit includes a transistor having an input electrode that inputs a high frequency signal and an output electrode that outputs the high frequency signal, a transmission line that is connected to any one of the input electrode and the output electrode, and transmits the high frequency signal, a coupling line electrically separated from the transmission line to an extent that an electromagnetic field coupling is enabled with the transmission line, and a resonance circuit that is connected between a first end of the coupling line and a reference potential, and minimizes an impedance between the first end and the reference potential at a resonance frequency.