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All Couplers

Coupler Features

• High Directivity
• Multiple, Flat Coupling Values available
• Low Insertion Loss
• Directional, Bidirectional, and Dual Directional Designs

Learn More About Couplers

A coupler allows the user to sample the power on a transmission line with a given coupling factor. Crucially, a directional coupler will (ideally) sample power in only one direction, discriminating between forward and backward traveling signals. The selectivity with which the coupler can select between forward and reverse waves is called the directivity, and it is usually the most important factor in selecting a directional coupler. Other important factors include return loss, coupling value, coupling flatness, insertion loss, and power handling. For in-depth information regarding all couplers, please refer to the Microwave Power Dividers and Couplers Primer and the Directivity and VSWR Measurements App Note.
Click here for our 90° Quadrature Hybrid Couplers.

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High Directivity Bridge
Frequency Band [GHz]
FeaturedModelDatasheetLowHighVSWRMean Coupling [dB]Directivity [dB]S-ParametersSurface MountBare DieModuleRoHS
NCBR16-0003 PDF Download.000231.11640CBR16-0003--Buy NowY
NCBR16-0006 PDF Download.000261.151638CBR16-0006--Buy NowY
NCBR16-0012 PDF Download.0002121.251632CBR16-0012--Buy NowY
NCBR17-0026 PDF Download.0002261.221723CBR17-0026--Buy NowY

Dual Directional
Frequency Band [GHz]
FeaturedModelDatasheetLowHighVSWRMean Coupling [dB]Amplitude Flatness [dB]Directivity [dB]S-ParametersSurface MountBare DieModuleRoHS
NCD10-0106 PDF Download0.76.31.1410±0.625 - --Buy NowY
NCD10-0114 PDF Download0.714.71.1710±0.623 - --Buy NowY

Pick-Off Tees
Frequency Band [GHz]
FeaturedModelDatasheetLowHighInsertion Loss [dB]Pick-Off Loss [dB]S-ParametersSurface MountBare DieModuleRoHS
NPT-0020 PDF DownloadDC20216 - --Buy NowN
NPT-0030 PDF DownloadDC30216 - --See TableN

Elite Directional

Elite Directional Couplers

The ruggedized Marki Elite Series of next generation broadband directional couplers combine sophisticated neural network design with deep circuit knowledge and triplate stripline construction to offer the best directivity, return loss and coupling accuracy available on the market. Each coupler is bidirectional, meaning that it can be used in both the forward and reverse direction when the coupled ports are terminated with a 50Ω load or detector. Conductive paint is applied to all Elite Series products to reduce EMI/RFI leakage and improve resistance to corrosion. Couplers from this series are a suitable choice for broadband return loss measurements, power leveling, and signal monitoring applications.

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Directional

Stripline Directional

Marki uses proprietary design techniques and software to create the highest performance directional couplers in the world. These couplers are based on industry standard triplate stripline construction techniques, making them suitable for high reliability applications. Each coupler is bidirectional, meaning that it can be used in both the forward and reverse direction when the coupled ports are terminated with 50Ω circuits, either loads or detectors. Some models come with one port terminated in a 50Ω load, while most have both coupled ports available. They have been tested to 50 watts of input power (see this tech note) and are suitable for load-pull testing, output power monitoring, and other broadband applications. Custom designs are possible for high volume requirements.

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Bridge

High Directivity Bridge

Bridge couplers from Marki Microwave offer the highest possible directivity across a very broad bandwidth, including to low frequencies (down to 200kHz). Unlike stripline couplers that are based on quarter-wave capacitively-coupled structures, bridge couplers are based on Marki’s industry leading magnetically-coupled baluns. They are the best choice for return loss measurements due to their high directivity.  For applications above 26GHz see our Elite Series of high directivity directional couplers.

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High Directivity Bridge
Frequency Band [GHz]
FeaturedModelDatasheetLowHighVSWRMean Coupling [dB]Directivity [dB]S-ParametersSurface MountBare DieModuleRoHS
NCBR16-0003 PDF Download.000231.11640CBR16-0003--Buy NowY
NCBR16-0006 PDF Download.000261.151638CBR16-0006--Buy NowY
NCBR16-0012 PDF Download.0002121.251632CBR16-0012--Buy NowY
NCBR17-0026 PDF Download.0002261.221723CBR17-0026--Buy NowY

Low Loss High Power

Low Loss High Power

Low insertion loss couplers are perfect for load-pull and other test applications that are sensitive to loss or use high powers. Marki uses two types of construction for low loss couplers. High power stripline couplers use wider traces and thicker circuit boards than our standard stripline directional couplers, but their multisection design provides low loss but with a flat coupling value across the band. Airline directional couplers, as the name implies, use air as the dielectric material. This provides the lowest possible loss and correspondingly highest power handling, but with a coupling factor that varies across the band. These couplers are ideal for low loss or high power applications where the coupling factor can be calibrated out. Power handling of both types of couplers is limited by the connectors, which are available in N, APC-7, SMA, 2.92, and 2.4mm for different models of coupler.

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Dual Directional

Dual Directional

While our stripline directional couplers are bidirectional and can measure power in both directions with 50Ω detectors, there are some applications that use non-50Ω power detectors. For these applications a dual directional coupler allows the user to measure power in both the forward and reverse directions without degradation in directivity due to impedance mismatch presented by the power detector. A dual directional coupler is two bidirectional couplers fabricated back to back, making each coupler insensitive to the non-50Ω coupled port termination.

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Dual Directional
Frequency Band [GHz]
FeaturedModelDatasheetLowHighVSWRMean Coupling [dB]Amplitude Flatness [dB]Directivity [dB]S-ParametersSurface MountBare DieModuleRoHS
NCD10-0106 PDF Download0.76.31.1410±0.625 - --Buy NowY
NCD10-0114 PDF Download0.714.71.1710±0.623 - --Buy NowY

Pick-Off Tees

Pick-Off Tees

A pick off tee is a resistive circuit that provides non-directional coupling of microwave signals. Due to reflections, a directional coupler is preferred for most applications. In an extremely well matched system a Marki pick off tee can provide extremely broadband signal monitoring in a very small package.

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Pick-Off Tees
Frequency Band [GHz]
FeaturedModelDatasheetLowHighInsertion Loss [dB]Pick-Off Loss [dB]S-ParametersSurface MountBare DieModuleRoHS
NPT-0020 PDF DownloadDC20216 - --Buy NowN
NPT-0030 PDF DownloadDC30216 - --See TableN

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