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Filter Features

• High order maximally flat design
• Low passband insertion loss
• Broad, high frequency pass and stopbands
• Lumped-element, microstrip, cavity and GaAs MMIC
• MMIC filters (MFB/MDPX) are incredibly small & reliable
Contact us for custom MMIC filters for 1000pc+ applications

Learn More About Filters

RF/Microwave filters are a fundamental component of signal processing. They pass signals within their passband and reject signals outside the passband. Filters are typically reflective, meaning that they reflect signals outside of the passband; however our diplexers provide an absorptive termination for out-of-band signals which is ideal following mixers or NLTL comb generators. Important specifications include rejection (the measure of how well undesired signals are rejected), steepness of the rejection skirts, insertion loss, and return loss. There is a fundamental tradeoff between rejection and filter size, as both are determined by the ‘order’ of the filter. A higher order filter provides more rejection, but requires more space and has higher insertion loss. Our new GaAs MMIC filters (MFB/MDPX series) provide an extremely small formfactor in bare die or QFN and are highly scalable and reliable.

Filters

FeaturedModelDatasheetCutoff Frequency [GHz]30 dB Rejection Frequency [GHz]50 dB Rejection Frequency [GHz]80 dB Rejection Frequency [GHz]S-ParametersSurface MountBare DieModuleRoHS
NFH-1700 PDF Download171411.56FH-1700--Buy NowY
NFH-1800 PDF Download1815126.5FH-1800--Buy NowY
NFH-2600 PDF Download2621.51811FH-2600--Buy NowY
NFH-4000 PDF Download4036.63325FH-4000--Buy NowY
NFH-5500 PDF Download55514535FH-5500--Buy NowY

FeaturedModelDatasheetCenter Frequency [GHz]Low Frequency 1 dB Cutoff [GHz]High Frequency 1 dB Cutoff [GHz]S-ParametersSurface MountBare DieModuleRoHS
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Lowpass

A lowpass filter has a direct connection from input to output, passing DC and all frequencies below some specified 3 dB cutoff frequency. After the 3 dB cutoff frequency the insertion loss increases dramatically and the filter (ideally) rejects all frequencies above this point. Physically realizable filters have ‘re-entry’ modes that limit the high frequency capability of the filter. At some higher frequency the rejection of the filter degrades, and higher frequency signals can appear at the output of the filter. Marki lowpass filters are microstrip filters that are CAD optimized and built on a low loss substrate, offering very broad rejection bands before re-entrant modes appear.

Highpass

A highpass filter will reject signals below their designed frequency of operation, and pass all signals above this. Important specifications include rejection of low frequency signals, insertion loss, return loss, and insertion loss flatness above the 3 dB cutoff frequency. Marki highpass filters are based on a cavity design that offers operation to very high frequencies with broad, resonance free passband and stopbands.

Filters

FeaturedModelDatasheetCutoff Frequency [GHz]30 dB Rejection Frequency [GHz]50 dB Rejection Frequency [GHz]80 dB Rejection Frequency [GHz]S-ParametersSurface MountBare DieModuleRoHS
NFH-1700 PDF Download171411.56FH-1700--Buy NowY
NFH-1800 PDF Download1815126.5FH-1800--Buy NowY
NFH-2600 PDF Download2621.51811FH-2600--Buy NowY
NFH-4000 PDF Download4036.63325FH-4000--Buy NowY
NFH-5500 PDF Download55514535FH-5500--Buy NowY

Bandpass

A bandpass filter is capacitively coupled between the two ports, offering rejection of both low frequency and high frequency signals and selecting a particular band referred to as the ‘passband’. Important specifications include the center frequency, passband (expressed either as start and stop frequencies or as a percentage of the center frequency), rejection and steepness of rejection, and width of the rejection bands. All bandpass filters will have re-entrant modes at higher frequencies, so the width of the high frequency rejection band is an important consideration. Marki offers two types of bandpass filters: CAD-optimized microstrip filters built on a low-loss substrate offered in surface mount and connectorized packages, and GaAs MMIC filters with tight fabrication tolerances offered as surface mount QFN and bare die. Both offer low loss and extremely broad rejection bands.

Filters

FeaturedModelDatasheetCenter Frequency [GHz]Low Frequency 1 dB Cutoff [GHz]High Frequency 1 dB Cutoff [GHz]S-ParametersSurface MountBare DieModuleRoHS
NFB-0785SMG PDF Download7.857.258.45FB-0785SMGBuy Now--N
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NFB-0900SM PDF Download9.08.49.6FB-0900SMBuy Now--N
NFB-0905 PDF Download9.058.459.65FB-0905--Buy NowN
NFB-0955SM PDF Download9.558.910.2FB-0955SMBuy Now--N
NFB-0955 PDF Download9.558.910.2FB-0955--Buy NowN
NFB-1050SM PDF Download10.59.611.4FB-1050SMBuy Now--N
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Y PDF Download119.512.5MFB-1100-Buy Now-Y
NFB-1140SM PDF Download11.410.4512.35FB-1140SMBuy Now--N
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Y PDF Download14.4513.615.1MFB-1445SMBuy Now--Y
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Diplexers Features

• High Isolation
• Reentrance and Resonance Free Passbands
• Reflectionless termination of unwanted harmonics
• Broad, high frequency passbands
A diplexer is a three port device that combines or divides a common signal according to frequency, into low pass and high pass ports. Unlike a duplexer, which combines two bandpass filters, diplexers are very broadband. Important specifications include frequency coverage, out of band rejection for the high/low pass filters, isolation between the high/low pass filters, insertion loss, and return loss. Marki diplexers offer extremely broad, resonance free passbands. Diplexers can be used as low loss combiners or dividers for signals with different frequencies or as reflectionless filters (with one port terminated) at the output of mixers and other nonlinear devices with many harmonics. Marki offers two types of diplexers: CAD-optimized microstrip filters built on a low-loss substrate offered in surface mount and connectorized packages, and GaAs MMIC filters with tight fabrication tolerances offered as bare die. Both offer low loss and extremely broad rejection bands.

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