Bidirectional Coupler Impedance Matching Network
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Solution Overview
Problem
Existing bidirectional couplers lack a matching network before the output terminal, leading to impedance mismatch and increased return loss during signal detection.
Innovation Solution
Incorporating a matching network with variable capacitors, inductors, or resistors between the switch circuit and detection port to adjust impedance and minimize return loss, while using termination circuits and switch circuits to manage signal detection effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a matching network is added between the switch circuit and detection port, then return loss is suppressed and impedance matching is improved, but device complexity increases
Solution Approach 1:
A matching network comprising variable capacitors and/or variable inductors is introduced as an intermediary component between the switch circuit and detection port. This matching network acts as a mediator to transform and match impedances, thereby suppressing return loss without requiring fundamental changes to the existing bidirectional coupler architecture.
Solution Approach 2:
The matching network incorporates variable capacitors and/or variable inductors that can dynamically adjust their impedance characteristics. This dynamic adjustment capability allows the system to maintain optimal impedance matching across different operating conditions, signal directions, and frequency bands, effectively suppressing return loss while adapting to changing requirements.
2Measurement precision
If impedance adjustment is performed for bidirectional detection, then directivity is improved, but return loss at the output terminal increases
Solution Approach 1:
The matching network changes electrical parameters (capacitance and/or inductance values) to achieve impedance transformation. By adjusting the reactive components in the matching network, the system can optimize impedance matching for bidirectional detection while simultaneously controlling return loss at the output terminal, resolving the contradiction between directivity improvement and return loss suppression.
Solution Approach 2:
The patent replaces traditional mechanical impedance adjustment mechanisms with electrical component adjustment (variable capacitors and inductors). This substitution allows for more precise and flexible impedance control, enabling simultaneous optimization of directivity and return loss through electrical parameter tuning rather than mechanical adjustments.
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 enables bidirectional detection with suppressed return loss at the output terminal, improving directivity and isolation by matching impedances across different signal directions and frequency bands.
Implementation Method 1
a matching network disposed between the switch circuit and the detection port, the matching network including at least one of a first variable capacitor, a first variable inductor, or a first variable resistor
Implementation Method 2
the matching network including at least one of a first variable capacitor
Implementation Method 3
the matching network including at least one of a first variable capacitor, a first variable inductor
Implementation Method 4
the matching network including at least one of a first variable capacitor, a first variable inductor, or a first variable resistor
Data Source
AI summary
Bidirectional detection is performed with a suppressed increase in return loss at an output terminal. A bidirectional coupler includes a detection port, a main line connected to a first port and a second port, a sub-line, a termination circuit, a switch circuit that switches each of one end and another end of the sub-line to the termination circuit or the detection port, and a matching network disposed between the switch circuit and the detection port and including at least one of a first variable capacitor, a first variable inductor, or a first variable resistor. In a first mode for detecting a first signal, the switch circuit connects the one end of the sub-line to the detection port, and connects the other end of the sub-line to the termination circuit.