Impedance｜Glossary
This page is part of the Electrical Glossary for RF and coaxial systems.
What Is Impedance?
Impedance is the measure of opposition to the flow of alternating current in an electrical circuit.
It is defined as the ratio of voltage to current and includes both resistance and reactance.
Unlike simple resistance in DC circuits, impedance accounts for frequency-dependent effects such as capacitance and inductance.
In RF systems, impedance is a fundamental parameter that determines how signals propagate through transmission lines and components.
Impedance in RF and Coaxial Systems
In RF and coaxial systems, impedance is critical for efficient signal transmission and system performance.
Coaxial cables and connectors are designed with specific characteristic impedance values, typically 50 ohms or 75 ohms.
Impedance matching between components is essential to prevent reflections and minimize signal loss.
When impedance is mismatched, part of the signal is reflected back toward the source, leading to reduced transmission efficiency and degraded signal quality.
Proper impedance control ensures stable signal propagation, optimal power transfer, and reliable system operation.
FAQs: Impedance
QWhat is impedance?
QWhat is impedance?
Impedance is the opposition to alternating current flow, defined as the ratio of voltage to current in a circuit.
QWhat is characteristic impedance?
QWhat is characteristic impedance?
Characteristic impedance is the inherent impedance of a transmission line, typically 50Ω or 75Ω in coaxial systems.
QWhy is impedance matching important?
QWhy is impedance matching important?
Impedance matching prevents signal reflection and ensures efficient signal transmission in RF systems.
Purchase Guide
Tyclon coaxial connectors and processed coaxial cable products can be purchased directly online using a variety of credit cards.
