Radio Frequency, RF, Technology and Design

- concise guides, information, tutorials and data about radio frequency, RF, technology and RF design.

Types of radio modulation

There is a huge variety of different types of modulation or modulation techniques that can be used to superimpose information, either digital or analogue onto an RF signal.
Overview of the different modulation techniques available
What is amplitude modulation
What is frequency modulation
What is phase modulation
    Phase shift keying, PSK
    Minimum shift keying, MSK
    Gaussian minimum shift keying, GMSK modulation
    QAM - Quadrature Amplitude Modulation
        Comparison between the different forms of QAM - 16 QAM, 64 QAM, 128 QAM, etc

Radio signal modulation formats

Although there is a large variety of different modulation techniques that can be used, different signal formats can be used along with these modulation techniques to enable radio signals to be used in differnet ways. Some of these techniques are given below:
Tutorial of the basics of OFDM
Tutorial of the basics of MIMO
CDMA basics

RF mixing and mixers

RF mixing is one of the basic RF techniques. It is widely used in RF technology and is one of the cornerstones of RR design.
The fundamentals of RF mixers and mixing
Key points for mixer specifications
Double balanced mixer basics

Couplers, combiners and splitters

RF filters and RF filter design

VSWR and Return Loss