Premium 3 db bandwidth: Filtronetics, Inc designs & manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um-1 and SMD packages in the KHz, MHz and GHz range.
Premium Filters, Oscillators and Crystals: Filtronetics, Inc designs & manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um-1 and SMD packages in the KHz, MHz and GHz range. 3 db bandwidth 3 db cutoff anti alias filter band pass crystal filter band pass filters band stop filter bandpass filters bandstop filter ceramic filter clock oscillator crystal band pass filter crystal bandpass filter crystal filters band reject filter electronic filter emi filter filter bank filtronetics frequency control filter quartz crystal resonator helical filter high pass filters highpass filters if filter lc filter lc rf filter low pass filters lowpass filters mcf monolithic crystal filter monolithic filter notch filters oscillator quartz crystal quartz filter rf crystal rf filter saw filter smd crystal surface acoustic wave filter switched filter tcvcxo tcxo vctcxo vcxo voltage controlled crystal oscillator voltage controlled temperature controlled crystal oscillator xo front end filter band pass filter bandpass filter low pass filter lowpass filter highpass filter high pass filter notch filter crystal filter custom filter hc-49 crystal ocxo ovenized crystal oscillator temperature controlled crystal oscillator 3 db bandwidth 3 db cutoff anti alias filter band pass crystal filter band pass filters band stop filter bandpass filters bandstop filter ceramic filter clock oscillator crystal band pass filter crystal bandpass filter crystal filters band reject filter electronic filter emi filter filter bank filtronetics frequency control filter quartz crystal resonator helical filter high pass filters highpass filters if filter lc filter lc rf filter low pass filters lowpass filters mcf monolithic crystal filter monolithic filter notch filters oscillator quartz crystal quartz filter rf crystal rf filter saw filter smd crystal surface acoustic wave filter switched filter tcvcxo tcxo vctcxo vcxo voltage controlled crystal oscillator voltage controlled temperature controlled crystal oscillator xo front end filter band pass filter bandpass filter low pass filter lowpass filter highpass filter high pass filter notch filter crystal filter custom filter hc-49 crystal ocxo ovenized crystal oscillator temperature controlled crystal oscillator prep042402 Premium Filters, Oscillators and Crystals: Filtronetics, Inc designs & manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um-1 and SMD packages in the KHz, MHz and GHz range.









FILTRONETICS, Inc. designs and manufactures a complete array of filters, oscillators and crystals. 

3 dB Bandwidth

The 3dB bandwidth of a filter is defined as the difference between the upper 3 dB frequency and the lower 3 dB frequency.  The formula can be expressed as 3 dB Bandwidth = 3 dB Fhigh - 3 dB Flow. The reference is usually taken at the point of minimum insertion loss but is sometime taken at the center frequency of the filter. Normally the 3 dB bandwidth is specified as the minimum pass bandwidth of a filter. However, In some cases a filter pass band can be specified as 0.5 dB bandwidth, 1.0 dB bandwidth or 6 dB bandwidth.

The term 3 dB bandwidth is normally associated with the pass band of bandpass or bandstop filter.  The term 3 dB cutoff is used in conjunction with lowpass or highpass filters. The term bandwidth can also refer to the stopband of a filter. The term stop bandwidth is used when specifying the stopband of a bandpass or a bandstop filter. Normally the stop bandwidth is the maximum bandwidth of a filter. If a symmetrical stop bandwidth is required it is best to specify as ± bandwidth instead of a total bandwidth. Other related terms are the percent 3 dB bandwidth and loaded Q. Percent bandwidth is defined as the 100 times the 3 dB bandwidth in Hz divided by the center frequency in Hz. Loaded Q is defined as center frequency divided by the 3 dB bandwidth in Hz.

Filtronetics Inc. can supply filters with almost any bandwidth. For filters with percent 3 dB bandwidths less than 1% crystal filters, SAW filters, or monolithic filters may be used. For filters with percent 3dB bandwidths larger than 1% LC filters, Helical filters, ceramic filters, SAW filters, cavity type, or microwave filters may be used.


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   FILTRONETICS, Inc.
6010 Parretta Dr., Kansas City, MO  64120
816-231-7375    FAX: 816-241-0368   info@filtro.net

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Premium Filters, Oscillators and Crystals: Filtronetics, Inc designs & manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um-1 and SMD packages in the KHz, MHz and GHz range. 3 db bandwidth 3 db cutoff anti alias filter band pass crystal filter band pass filters band stop filter bandpass filters bandstop filter ceramic filter clock oscillator crystal band pass filter crystal bandpass filter crystal filters band reject filter electronic filter emi filter filter bank filtronetics frequency control filter quartz crystal resonator helical filter high pass filters highpass filters if filter lc filter lc rf filter low pass filters lowpass filters mcf monolithic crystal filter monolithic filter notch filters oscillator quartz crystal quartz filter rf crystal rf filter saw filter smd crystal surface acoustic wave filter switched filter tcvcxo tcxo vctcxo vcxo voltage controlled crystal oscillator voltage controlled temperature controlled crystal oscillator xo front end filter band pass filter bandpass filter low pass filter lowpass filter highpass filter high pass filter notch filter crystal filter custom filter hc-49 crystal ocxo ovenized crystal oscillator temperature controlled crystal oscillator 3 db bandwidth 3 db cutoff anti alias filter band pass crystal filter band pass filters band stop filter bandpass filters bandstop filter ceramic filter clock oscillator crystal band pass filter crystal bandpass filter crystal filters band reject filter electronic filter emi filter filter bank filtronetics frequency control filter quartz crystal resonator helical filter high pass filters highpass filters if filter lc filter lc rf filter low pass filters lowpass filters mcf monolithic crystal filter monolithic filter notch filters oscillator quartz crystal quartz filter rf crystal rf filter saw filter smd crystal surface acoustic wave filter switched filter tcvcxo tcxo vctcxo vcxo voltage controlled crystal oscillator voltage controlled temperature controlled crystal oscillator xo front end filter band pass filter bandpass filter low pass filter lowpass filter highpass filter high pass filter notch filter crystal filter custom filter hc-49 crystal ocxo ovenized crystal oscillator temperature controlled crystal oscillator prep042402 Premium Filters, Oscillators and Crystals: Filtronetics, Inc designs & manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um-1 and SMD packages in the KHz, MHz and GHz range.

 

3 db bandwidth

3 db bandwidth

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