QJR Series Precision High Directivity Couplers

Product Description

QuinStar Technology's QJR series precision high directivity couplers cover the frequency range of 18 to 170 GHz in nine waveguide bands. They are available with 3 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 high directivity 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 superior directivity, insertion loss, coupling flatness and accuracy also make these directional couplers useful for a wide range of laboratory requirements and subsystem applications. In addition to the standard three-port directional couplers, QuinStar offers custom four-port directional couplers.

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 at center frequency)	3, 6, 10, 20, 30 and 40 ± 1
Coupling Flatness (±dB typ)	0.7	0.7	0.7	0.7	0.7	0.8	0.8	1.0	1.0
Directivity (dB typ) ^{1, 3}	37	37	37	37	35	35	35	30	28
Insertion Loss (dB max) ²	0.7	0.7	0.7	0.7	0.8	1.0	1.2	2.0	2.5
VSWR, Main Line (max)	1.1:1	1.1:1	1.1:1	1.1:1	1.1:1	1.1:1	1.1:1	1.15:1	1.15:1
VSWR, Secondary Line (max)	1.1:1	1.1:1	1.1:1	1.1:1	1.1:1	1.15:11	1.15:1	1.2:1	1.21:1

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.
³ For 30 dB and 40 dB couplers: directivity = 25 dB typ.

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: QJR - A BC D E 0

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:
	Precision General Purpose Couplers (QJG Series)	Matched Hybrid Tees (QJH Series)
	General Purpose Crossguide Couplers (QJX 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