RF Directional Coupler

An RF Directional Coupler is a passive 4-port device which accepts an input RF signal and divides it into 2 output signals. These output signals are quite unequal in amplitude: the outputs differ in power level by the coupling value, in dB. The larger signal is at the main-line output port. The smaller signal is at the coupled port. The fourth port is called the “Isolated” port and is typically terminated with a resistor (when terminated internally, the isolated port is usually unavailable). RF Directional Couplers are used in many circuit and system applications, such as Test & Measurement, RF amplifiers, transmitters and receivers. Richardson RFPD carries a wide assortment of RF Directional Couplers, including coaxial-connectorized, surface mount, and waveguide type units. These products cover frequency ranges from 10 MHz to 18 GHz, including octave and multi-octave ranges in 5dB to 30dB values. Performance grades range from low-cost commercial to rugged military. Specific attributes which are important in selecting the right RF Directional Coupler for your application include: Type (Connectorized, Surface Mount or Waveguide); Power (W) – maximum input level; Frequency Range (GHz) of Operation; Coupling Value/Precision (dB), Directivity (dB); Insertion Loss (dB); Dimensions; and VSWR (ratio).

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Mfg

TTM Technologies (2)

Type

Surface Mount (2)

Minimum Frequency (GHz)

3.3 (1)
3.6 (1)

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Maximum Frequency (GHz)

5.1 (2)

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Coupling Value/Precision (dB)

5 (1)
20 (1)

Power (W)

10 (1)
25 (1)

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Dimensions

0.125 in x 0.1 in (1)
3.18 mm x 2.54 mm (1)

Directivity (dB)

20 (1)

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Insertion Loss (dB)

0.07 (1)
0.2 (1)

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VSWR (-:1)

1.152 (1)
1.22 (1)

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	Image	Item	Mfg Part #	Mfg	Description	Datasheet	Availability	Min/Mult	Price (US Stock)	Quantity		ECAD Model	Type	Minimum Frequency (GHz)	Maximum Frequency (GHz)	Coupling Value/Precision (dB)	Power (W)	Dimensions	Directivity (dB)	Insertion Loss (dB)	VSWR (-:1)
		X4C40K1-20SR1	X4C40K1-20SR1	TTM Technologies	RF Directional Coupler		1,438	500/500	500:   $1.9700 2500:   $1.9300 5000:   $1.8900 7500:   $1.8500 10000:   $1.8100	Add To Order	Quote		Surface Mount	3.3	5.1	20	25	3.18 mm x 2.54 mm	20	0.07	1.22
		X4C45K1-05SR1	X4C45K1-05SR1	TTM Technologies	RF Directional Coupler		500	500/500	500:   $1.9700 2500:   $1.9300 5000:   $1.8900 7500:   $1.8500 10000:   $1.8100	Add To Order	Quote		Surface Mount	3.6	5.1	5	10	0.125 in x 0.1 in		0.2	1.152