This post tells about impedance in microwave network analysis. Impedance was first used to describe the relationship VIin AC circuits. Later the concept of impedance…

# Category: RF Electronic Devices and Systems

**RF**** Electronic Devices and Systems Design: Preface**

**Aim of the study element**

To introduce the principles and basic concepts RF and microwave theory, acquire knowledge about noises, non–linear effects, wireless systems, their design and measurement methodology and technology.

**Learning outcome**

Having successfully completed this element you will be able to:

- Successfully use transmission and electromagnetic and transmission line theories for microwave electric circuits.
- Be familiar with the basic concepts of RF and microwave devices.
- Make successful microwave analysis with CAD instrumentation and analytical tools.
- Have knowledge about non–linear effects and noises in microwave devices.
- Be introduced to and will be able to design the most commonly used microwave systems.

**Covered topics**

- Introduction into microwaves.
- Scattering parameters, impedance matching and tunning, Smith chart.
- Microwave network analysis.
- Microwave resonators.
- Power dividers and directional couplers.
- Microwave filters, and design of ferromagnetic components.
- Active microwave devices.
- Noise and non–linear distortion.
- Basics of microwave systems/applications.

## RF signals – introduction

The radio frequency and microwave field deals with AC signals, with frequencies ranging from 100MHz to 1,000GHz. Radio frequencies usually refer to signals from…

## Transmission line theory

The transmission line theory, in contrary, works in conditions where the transmission line is equal to a part of the signal wavelength. The transmission…

## Smith Chart

The Smith Chart is shown in Figure 1. It is a very useful tool for solving the problems of RF engineers with regards to…

## Quarter-wave impedance transformer

The quarter-wave impedance transformer is a device that matches the transmission line and the impedance and is shown in Figure 1. Let's consider the…

## Transmission line circuit for mismatched load and generator

Let's consider the most general case of a circuit, where we have the arbitrary loads Z1, Z2 and an arbitrary generator. The input impedance of…

## Transmission line losses

All transmission lines are characterised by conductivity and dielectric losses. In some cases losses can be neglected, but not in others. When losses are…

## Fields in transmission lines

Let's consider the general case of electromagnetic waves propagation in transmission lines. Transmission lines can be cylindrical with a parallel core, or can be…

## Rectangular waveguide

This post answers the question "What is rectangular waveguide?". In order to find the transmission line impedance and the fields in the transmission line,…

## Circular transmission lines

A circular waveguide is schematically depicted in Figure 5. To consider its parameters we will employ the polar coordinates with radial components ρ and…