Radio Frequency (RF) Filters and Microwave Filters represent a class of electronic filter, designed to operate on signals in the megahertz (MHz) to gigahertz (GHz) frequency ranges (medium frequency to extremely high frequency). This frequency range is the range used by most broadcast radio, television, wireless communication (cellphones, Wi-Fi, etc.), and thus most RF and microwave devices will include some kind of filtering on the signals transmitted or received. Such filters are commonly used as building blocks for duplexers and diplexers to combine or separate multiple frequency bands.
Filter Functions
Four general filter functions are desirable:
- Band-pass filter: select only a desired band of frequencies
- Band-stop filter: eliminate an undesired band of frequencies
- Low-pass filter: allow only frequencies below a cutoff frequency to pass
- High-pass filter: allow only frequencies above a cutoff frequency to pass
RF filters can filter out the noise or reduce the interference of the external signals that could affect the quality or the performance of any communication system. The lack of the proper RF filters in place could take a toll on the transference of the signal frequencies which could end up hurting the communication process. Because of this, the RF filters play an important role in the wireless communication system, i.e. satellite, radar, mobile wireless system, and more.
RF Filter has strict printed circuit board (PCB) manufacturing requirements and board materials selection.
RF Filter PCB Assembly