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Posts tagged RF

Synonyms: radio-frequency radio-frequencies

Anything related to radio frequency (RF) circuits and techniques.

Here we consider RF the range of frequencies from about 30kHz (just above audio band) to about 3GHz (overlapping with the lower limit for microwaves). In this frequency range practical communication systems can be built using lumped-parameters circuit techniques.

Note: the frequency range considered RF is controversial in the literature (see tag WIKI).
Tag Wiki

What is considered RF (radio frequency) is somewhat controversial in the literature.

At one extreme position there are authors that consider RF any part of the EM spectrum where radio transmissions can be implemented, and so they conflate it with the concept of radio spectrum, i.e. from $\pu{3 kHz}$ to $\pu{300 GHz}$:

On the other hand there are people that consider RF a more restricted range, excluding the lower part of the radio spectrum (audio band and below), and so for these people RF ranges from $\pu{30 kHz}$ to $\pu{300 GHz}$:

Radio frequency on Wikipedia.

There are other authors, who take a more pragmatic approach and consider RF only the part of the radio spectrum for which lumped-element analysis and design techniques can be applied in a practical way, so from about $\pu{30 kHz}$ to about $\pu{3 GHz}$ (someone puts the upper limit at $\pu{300 MHz}$, someone at $\pu{1 GHz}$ ), hence excluding most part of the microwave bands.

In fact, for microwave systems lumped-elements circuit techniques often fail and special techniques based on Maxwell's equations must be employed. And for very low frequencies, although lumped-elements techniques can be used, the structures (e.g. antennas) become unwieldy because of the extremely long wavelength ($\pu{100km}@\pu{3kHz}$ in vacuum), so they require special technology.

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Q&A LNA layout consideration 1-1000MHz

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Question RF pcb-layout layout
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Assume that I have some generic antenna connector, followed by a pi-filter/50ohm impedance matching components, then a DC blocking cap (as per the RF switch recommendations) and then a RF switch fo...

4 answers  ·  posted 2y ago by Lundin‭  ·  last activity 7mo ago by Nick Alexeev‭

Question RF
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Q&A How to calculate the RC filter of a TCXO for a RFIC reference?

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1 answer  ·  posted 2y ago by Lundin‭  ·  edited 9mo ago by Lorenzo Donati‭

Question RF oscillator low-pass-filter TCXO
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Q&A What effect will extreme temperatures have on characteristic impedance of a wire?

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2 answers  ·  posted 2y ago by Lundin‭  ·  last activity 9mo ago by Lorenzo Donati‭

Question impedance-matching antenna RF Impedance coaxial
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1 answer  ·  posted 10mo ago by Elleanor Lopez‭  ·  last activity 10mo ago by DSI‭

Question RF connector
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0 answers  ·  posted 2y ago by Lundin‭

Question RF superheterodyne automatic-gain-control
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Q&A Most correct term for radio switching noise?

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1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Olin Lathrop‭

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2 answers  ·  posted 3y ago by Kranulis‭  ·  last activity 3y ago by TonyStewart‭

Question PCB antenna RF
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2 answers  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by TonyStewart‭

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2 answers  ·  posted 3y ago by leroy105‭  ·  last activity 3y ago by leroy105‭

Question RF
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Q&A Mixers and Audio Extraction in a DCR Architecture

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1 answer  ·  posted 3y ago by jm567‭  ·  edited 3y ago by jm567‭

Question RF mixer
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Q&A Antenna Feed Line Question

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1 answer  ·  posted 3y ago by jm567‭  ·  last activity 3y ago by Olin Lathrop‭

Question antenna RF
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