What is an RF Filter? i have read about the [rf filter and would like to learn a bit more about what it is, how it is used without getting too technical.
thanks](http://www.oscilent.com/catalog/Category/rf_saw_filter.htm)
Its a bandpass filter - allows in signals of a particular frequency range while severely reducing the strength of other signals outside that range.
A RF filter can also be a circuit that blocks all RF where you don’t want it. For example, on power supply lines or cables that plug into computers or other high frequency signals. They are used to reduce or prevent radiation of energy that could be a source of interference for other devices.
theatrus:
Its a bandpass filter - allows in signals of a particular frequency range while severely reducing the strength of other signals outside that range.
The reason this is useful is that unwanted noise is usually spread across a wide spectrum of frequencies. By selecting just the frequency you are interested in, you reject a lot of this noise and so improve the signal-to-noise ratio. This in turn allows faster data rates with fewer errors.
That particular type of RF filter, a Surface Acoustic Wave filter, is a really clever invention - you kind of need to understand how a Finite Impulse Response filter works in signal processing theory to fully get it, but it uses simple transducers and the physical properties of a material to perform a signal processing task that would otherwise take a lot of expensive very-high-speed digital logic.