Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Impedance Matching and Wireless Communication

In course

MICRO-461: Low-power radio design for IoT

The basic function of an IoT node is to collect data and send it through a wireless channel to the cloud. Since the power consumption of an IoT node is largely dominated by the wireless communication, it is therefore key to understand the trade-offs faced ...

Description

This lecture covers the concept of impedance matching in passive RF circuits, focusing on impedance transformation using L circuits and networks. It also discusses the principles and standards of wireless communication, including analog and digital modulation, power efficiency, and noncoherent detection. Various impedance matching networks such as Inverted L, L, II, and T are explained with examples. The lecture delves into the design and implementation of impedance matching networks for different scenarios, emphasizing the importance of matching source and load impedances for efficient signal transmission.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Official source

Ontological neighbourhood

Electrical engineering

Telecommunications: Modulation

Physics

Electromagnetism: Electrical networks

Related concepts (32)

Modulation

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.

Input impedance

The input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into a load network that is external to the electrical source network. The input admittance (the reciprocal of impedance) is a measure of the load network's propensity to draw current. The source network is the portion of the network that transmits power, and the load network is the portion of the network that consumes power.

Impedance matching

In electronics, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Often, the desired value is selected to maximize power transfer or minimize signal reflection. For example, impedance matching typically is used to improve power transfer from a radio transmitter via the interconnecting transmission line to the antenna. Signals on a transmission line will be transmitted without reflections if the transmission line is terminated with a matching impedance.

Amplitude modulation

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation.

Output impedance

The output impedance of an electrical network is the measure of the opposition to current flow (impedance), both static (resistance) and dynamic (reactance), into the load network being connected that is internal to the electrical source. The output impedance is a measure of the source's propensity to drop in voltage when the load draws current, the source network being the portion of the network that transmits and the load network being the portion of the network that consumes.

Related lectures (57)

Wireless Channel: Multipath Effects & Modulation

Explores the impact of multipath effects, modulation techniques, and channel characteristics on wireless communication.

Sinusoidal Circuits: Examples and Impedances MOOC: Electrical engineering I

Covers examples in electrical engineering, impedance properties, and circuit components like resistance and reactance.

Circuits: LC Oscillator and Filters

Explores LC oscillators, filters, resonance, and energy losses in circuits with inductors and capacitors.

Electroacoustics: Electrical Systems

Covers fundamental concepts of electrical systems, including components, circuits, complex notations, quadrupoles, impedance, RLC circuits, and transformers.

Wireless Power and Data Transmission to Implanted Systems Log in to Mediaspace to watch this video