QJB / QJD Series Bi- and Dual-Directional Precision Couplers

Characteristics

Fullband Coverage

High Directivity

Excellent Coupling Flatness

Low Return Loss

View (with mirror) showing all ports. Note that
excess top and bottom metal is milled out, greatly
reducing weight without significant loss of strength.

Product Description

QuinStar Technology, Inc., offers QJB and QJD series precision bi-directional and dual-directional high directivity couplers, which cover a frequency range of 18 to 220 GHz in twelve waveguide bands. Coupling values of 20, 30 and 40 dB are available. In a dual directional coupler, the forward and reverse coupling values can be made different. The units are designed with a rugged splitblock mechanical structure for long-lasting durability to maintain the precision coupling values.

The bi- and dual-directional precision high directivity couplers are ideal devices in the applications of simultaneously testing, sampling or monitoring signals in both directions of the main arm of the coupler. Examples include instrumentation for incident and return signal measurement such as radar transmitted/reflected signal monitoring, etc.

Specifications

FREQUENCY BAND	K	Ka	Q	U	V	E	W	F	D	G
Frequency Range (GHz)	18-26.5	26.5-40	33-50	40-60	50-75	60-90	75-110	90-140	110-170	140-220
Coupling (dB)	20, 30 and 40 ± 1
Coupling Variation (dB)	±0.7	±0.7	±0.7	±0.7	±0.7	±0.8	±0.8	±1.0	±1.0	±1.2
Insertion Loss, Typ. (dB typ)	1.0	1.0	1.0	1.0	1.2	1.3	1.5	2.0	2.5	3.0
Directivity (dB typ)	37	37	37	37	35	35	35	30	28	25
Main Line VSWR (max)	1.10:1	1.10:1	1.10:1	1.10:1	1.10:1	1.10:1	1.10:1	1.15:1	1.15:1	1.20:1
Coupled Arm VSWR (max)	1.10:1	1.10:1	1.10:1	1.10:1	1.10:1	1.15:1	1.15:1	1.20:1	1.21:1	1.25:1

Figure 1: Coupler Configurations

WAVEGUIDE BAND	WAVEGUIDE SIZE & PATTERN	DIMENSIONS (Inches/mm)
		A	B		C	D	E	F	G
		Bi & Dual	Bi	Dual	Bi & Dual	Bi & Dual	Bi & Dual	Bi & Dual	Bi
K	WR-42 UG-595/U	1.40/35.6	1.10/27.9	1.24/31.4	7.75/196.9	6.87/174.5	0.44/11.1	0.350/8.9	0.475/12.1
Ka	WR-28 UG-599/U	1.10/27.9	0.93/23.6	1.05/26.7	6.21/157.7	5.15/130.8	0.38/9.5	0.290/7.4	0.405/10.3
Q	WR-22 UG-383/U	1.36/34.5	1.25/31.8	1.37/34.8	5.50/139.7	3.90/99.1	0.56/14.2	0.234/5.9	0.579/14.7
U	WR-19 UG-383/UM	1.36/34.5	1.23/31.2	1.34/34.0	5.50/139.7	3.90/99.1	0.56/14.2	0.198/5.0	0.578/14.7
V	WR-15 UG-385/U	1.20/30.5	0.83/21.1	0.91/23.1	3.84/97.5	2.64/67.1	0.38/9.7	0.153/3.9	0.383/9.7
E	WR-12 UG-387/U	1.20/30.5	0.82/20.7	0.88/22.4	3.40/86.4	2.20/55.9	0.38/9.7	0.127/3.2	0.384/9.8
W	WR-10 UG-387/UM	1.20/30.5	0.81/20.4	0.86/21.8	3.24/82.3	2.04/51.8	0.38/9.7	0.105/2.7	0.385/9.8
F	WR-8 UG-387/UM	1.20/30.5	0.80/20.3	0.84/21.3	2.42/61.5	1.22/31.0	0.38/9.7	0.085/2.2	0.385/9.8
D	WR-6 UG-387/UM	1.20/30.5	0.80/20.3	0.83/21.0	2.42/61.5	1.22/31.0	0.38/9.7	0.070/1.8	0.389/9.9
G	WR-5 UG-387/UM	1.20/30.5	0.80/20.3	0.81/20.6	2.42/61.5	1.22/31.0	0.38/9.7	0.056/1.4	0.392/10.0

Ordering Information

Model Number: QJx - A BC DE F 00

Coupler Type:

	B	=	Bi-directional Coupler
	D	=	Dual-directional Coupler

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
G	=	G-band

Arm 1 coupling level (Forward)

(20, 30, 40 dB)

Arm 2 coupling level (Reverse)

(20, 30, 40)

Flange Type:

	R	=	Round flange
	S	=	Square flange

Also available:
	Precision General Purpose Couplers (QJG 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)
	General Purpose Crossguide Couplers (QJX Series)	Multi-Output Power Divider (QMD Series)
	Master List of All Products	Catalog Request