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RF filter

A radio frequency (RF) filter is designed to be tuned to pass energy at a specified resonant frequency. In microwave communications systems, it is often necessary to filter a relatively broadband microwave signal into its component sub-bands. In order to combine a number of RF transmitters, the RF signals from each transmitter must be isolated from one another to prevent intermodulation and possible damage to the transmitters. RF filters of the air-filled cavity type may be utilized to provide isolation between the RF transmitters. High-frequency filters, such as RF filters, are used to implement high-frequency circuits in the base stations of mobile networks, mobile phones and other radio transceivers. Other RF filter applications include the adapter circuits and filter circuits of transmitter and receiver amplifiers. RF cavity filters may be used in linear power amplifiers and radio equipment such as cellular base stations, among other things, to, for example, reduce undesired frequencies in an RF signal, or to delay an RF signal by a predetermined amount of time. Radio frequency (RF) filters and multiplexers having filters typically employ a plurality of resonators.

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