Cobham Microwave RF & Microwave Filters - Cobham plc

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How to specify a filter or duplexerREJECTION AT FO ± X MHZThe attenuation of RF power through a filter, referenced to the minimum insertionloss point of the filter to the carrier (dBc). Those values can be specified atdifferent frequenciesLowpass Filter: A filter which passes low frequencies and rejects high frequenciesHighpass filter: A filter which passes high frequencies and rejects low frequenciesBANDPASS /BANDREJECT LOW PASS/ HIGH PASSBandpass: A filter that passes one band of frequencies and rejects both higherand lower frequenciesABSOLUTE GROUP DELAY VALUEThe propagation time of a signal through the filterGROUP DELAY VARIATION IN BANDWIDTHVariation of the group delay values within the filter bandwidthBand Reject Filter: A filter that rejects one band of frequencies and passes bothhigher and lower frequenciesPHASE LINEARITYThe deviation in the phase response from a straight line, usually expressed in degreesCobham Microwave 166
TECHNOLOGYAir cavityCeramic resonatorsLumped element ( discrete)WaveguideCENTRE FREQUENCY (FO)This frequency is defined as the average frequency of the 3dB bandwidthCUT OFF FREQUENCY3dB rejection frequency ( Low Pas and High Pass filter only)BANDWIDTHThe width of the passband is referenced to the minimum insertion loss point in thepass band. (3dB bandwidth for example)RIPPLEThe difference in peaks and valleys of the amplitude response in the passband thatare always the sameINSERTION LOSSThe loss of the filter measured at center frequencyINSERTION LOSS IN BANDWIDTHThe loss of the filter measured in bandwidthINSERTION LOSS VARIATION IN BANDWIDTHThe difference between maximum and minimum value of the amplitude responsein the pass bandRETURN LOSSReturn Loss (dB) is defined as a ratio of the incoming signal to the same reflected signalVSWRRatio of the incident signal compared to the reflected signal in a transmission lineMAXIMUM PEAK POWERThe peak power is much greater than the average powerINPUT IMPEDANCEThe impedance measured at the input terminal of a filter when the output isproperly terminated. Not applicable for waveguide filters without connectors.OUTPUT IMPEDANCEThe impedance measured at the output terminal of a filter when the input isproperly terminated. Not applicable for waveguide filters without connectorsOPERATING TEMPERATUREFunctional temperature without degradation in performanceSTORAGE TEMPERATUREMaximum temperature range for the filterSPECIFIC ENVIRONMENT REQUESTCan be according to MIL standard or specific valuesMAXIMUM TEMPERATURE SOLDERING REFLOWStandard value is a maximum temperature 245°C on component during solderingprocessMAXIMUM SIZE (L X W X H)Generally overall size, connectors not includedWEIGHTMaximum weightCONNECTORS / FLANGE / SMDSMA / TNC / N / WR….In case of connectors interface, Male or Female must be definedCOATINGSilver plated / Black Painted / OtherROHSRestriction of Hazardous Substances:Lead (Pb) < 0.1%Mercury (Hg) < 0.1%Cadmium (Cd) < 0.01%Hexavalent Chromium (CrVI) < 0.1%Polybrominated Biphenyls (PBB) < 0.1%Polybrominated Diphenyl Esters (PBDE) < 0.1%MAXIMUM INPUT POWER (CW)The maximum power input filter without degradation in performanceWe reserve the right to discontinue any item or productwithout notice and to change specifications at any time withoutincurring any obligation to incorporate new featuresin products previously sold. Non-contractual picturesCobham Microwave 167
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Cobham MicrowaveRF & Microwave Filt
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ContentsPresentationCobham Microwav
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DIODESFILTERS &DUPLEXERSISOLATORS &
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AIR CAVITY FILTERS CERAMIC FILTERS
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FiltersCavity filtersCeramic filter
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FiltersMarketsCobham Microwave 19
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OUTLINE DRAWINGTYPICAL PERFORMANCES
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OUTLINE DRAWINGCobham Microwave 29
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Cob-fcer-041Ceramic FiltersFEATURES
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Page 115 and 116: OUTLINE DRAWINGTYPICAL PERFORMANCES
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Cobham Microwave RF & Microwave Filters - Cobham plc

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