QJG Series Precision General Purpose Directional Couplers

Product Description

QuinStar Technology's QJG series of precision general purpose directional couplers cover the frequency range of 18 to 170 GHz in nine waveguide bands. They are available with three ports (for four ports please see our QJB/QJD series) with coupling values of 3, 6, 10, 20, 30 and 40 dB. They are constructed with a rugged splitblock mechanical design for long-lasting durability to maintain their coupling value.

Precision general purpose directional couplers are ideal devices for sampling or inserting RF energy in a waveguide transmission line without affecting the transmitting signal. They prove especially useful in applications such as RF power and signal reflection measurements in test systems. The directivity, insertion loss, and coupling flatness characteristics make these directional couplers useful for a wide range of laboratory requirements and subsystem applications.

Specifications

FREQUENCY BAND		K	Ka	Q	U	V	E	W	F	D
Frequency Range (GHz)		18-26.5	26.5-40	33-50	40-60	50-75	60-90	75-110	90-140	110-170
Waveguide Size		WR-42	WR-28	WR-22	WR-19	WR-15	WR-12	WR-10	WR-8	WR-6
Coupling Values (dB) (Nominal ± 1.0 dB at center frequency)		3, 6, 10, 20, 30 and 40 (For 3 and 6 dB, please consult factory for all bands)
Coupling Flatness (±dB typ)		0.8	0.8	0.8	0.8	0.8	0.8	0.9	1.0	1.0
Directivity (dB typ) ¹	3, 6 dB couplers	20	20	20	20	20	20	20	20	20
	10, 20 dB couplers	25	25	25	25	25	25	25	25	25
	30, 40 dB couplers	15	15	15	15	15	15	15	15	15
Insertion Loss, dB²		0.7	0.7	0.7	0.7	0.8	1.4	1.4	2.0	2.0
VSWR, Main Line (max)	3, 6 dB couplers	1.2:1	1.2:1	1.2:1	1.2:1	1.2:1	1.2:1	1.2:1	1.2:1	1.25:1
VSWR, Main Line (max)	10, 20, 30, 40 dB couplers	1.1:1	1.1:1	1.1:1	1.1:1	1.2:1	1.2:1	1.2:1	1.2:1	1.25:1
VSWR, Secondary Line (max)	3, 6 dB couplers	1.2:1	1.2:1	1.2:1	1.2:1	1.2:1	1.25:1	1.25:1	1.25:1	1.3:1
VSWR, Secondary Line (max)	10, 20, 30, 40 dB couplers	1.1:1	1.1:1	1.1:1	1.1:1	1.2:1	1.25:1	1.25:1	1.25:1	1.3:1

Other waveguide sizes are available.
¹ Directivity is the difference between power levels at the coupled port when input and output ports are interchanged.
² Insertion loss is defined as the power loss in excess of the loss due to coupling.

FREQUENCY BAND	WAVEGUIDE SIZE	FLANGE PATTERN	OUTLINE DIMENSIONS, inches/mm
FREQUENCY BAND	WAVEGUIDE SIZE	FLANGE PATTERN	A	B	C	D
K	WR-42	UG-595/U	1.40/35.6	1.10/27.9	7.75/196.8	0.44/11.2
Ka	WR-28	UG-599/U	1.10/27.9	0.93/23.6	6.21/157.7	0.53/13.5
Q	WR-22	UG-383/U	1.25/31.8	1.25/31.8	5.50/139.7	0.83/21.1
U	WR-19	UG-383/U	1.25/31.8	1.25/31.8	5.50/139.7	0.83/21.1
V	WR-15	UG-385/U	1.20/30.5	0.834/21.2	3.84/97.5	0.60/15.2
E	WR-12	UG-387/U	1.20/30.5	0.825/21	3.4/86.4	0.60/15.2
W	WR-10	UG-387/U	1.20/30.5	0.80/20.3	3.24/82.3	0.60/15.2
F	WR-8	UG-387/U	1.20/30.5	0.80/20.3	2.42/61.5	0.60/15.2
D	WR-6	UG-387/U	1.20/30.5	0.80/20.3	2.82/71.6	0.60/15.2

Ordering Information

Model Number: QJG - A BC D E 0 (Click here for automatic web quote request form)

Waveguide band designator:

K	=	K-band
A	=	Ka-band
Q	=	Q-band
U	=	U-band
V	=	V-band
E	=	E-band
W	=	W-band
F	=	F-band
D	=	D-band

Coupling value in dB

03, 06, 10, 20, 30 or 40

Number of ports:

	3	=	3 ports
	4	=	(for four ports please see our QJB/QJD series)

Version:

	O	=	Standard
	Z	=	Custom

Also available:
	General Purpose Crossguide Couplers (QJX Series)	Matched Hybrid Tees (QJH Series)
	Precision High Directivity Couplers (QJR Series)	E and H Plane Waveguide Tees (QUH Series)
	Bidirectional and Dual-directional Waveguide Couplers (QBC Series)	Short Slot Hybrid Power Divider (QSP Series)
	Broadband Waveguide Directional Couplers (QDC Series)	Single and Triple Ring Hybrid Power Divider (QHR Series)
	Precision Crossguide Couplers (QJC Series)	Multi-Output Power Divider (QMD Series)
	Precision Bi-directional and Dual-directional Waveguide Couplers (QJB/QJD Series)
	Master List of All Products	Catalog Request