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RF Filters can pass or reject signals by frequency. Performance specifications for RF filters include specified frequency, bandwidth, ripple, insertion loss, and voltage standing wave ratio. Filter type determines the specified frequency. For band pass and band reject filters, the specified frequency is the center frequency. For low pass filters, the specified frequency is the cut-off frequency. For high pass filters, the specified frequency is the cut-on frequency.
Filters use several types of connectors. BNC connectors are used in applications up to 2 GHz. TNC connectors are similar in size to BNC connectors, but feature a threaded coupling nut for applications that require performance to 11 GHz. SMA connectors directly interface the cable dielectric without air gaps. Other connectors for microwave filters include MMCX, MCX, SMB, Mini-UHF, Type N, and 7-16 connectors. |
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