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IMK Series Surface Mount
Thick Film Coupler
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IMK Series Resistive Couplers provide the sensing function over a
broad range of frequencies in a compact, easy to use component.
With alumina construction, insertion loss is comparable to more
complicated frequency sensitive couplers.
As with IMS attenuators, the IMK Series is engineered to optimize performance
in two ways:
1) Resistive areas are constant and are specified for the lowest dB value
ensuring that all couplers easily handle the incident RF power.
2) High inductance lines minimize ground path leakage and maintain low through loss.
The above constraints assure repeatability, reliability and optimal performance. The design and
construction of these couplers is simplified to minimize cost and maximize efficiency.
IMK Series Specifications
Insertion Loss (ports 1 - 2):
Coupling Range:
Standard Size:
Operating Frequency:
dB Flatness:
Operating Temperature:
Dissipated Power:
VSWR (main line):
Construction:
Attachment:
1dB or less (values greater than 18dB)
6 - 30dB
0.120” x 0.120” x 0.035” MAX
DC - 20GHz
See data on following pages
-55°C to 150°C
1W at 100°C Baseplate Temperature
1.2:1 depending on implementation
Thick Film on Alumina
Solder, Epoxy or Wirebond*
30dB
1W
Dissipated Power
Low Loss
Wideband
International
Manufacturing
Services, Inc.
Recommended Through Line Power Should Not Exceed 6W
Ordering Information
IMK2549-XXDB
IMK Series Electrical Schematic
port 1
R
1
port 3
R
2
PN Prefix*
IMK2549
IMK2550
IMK2574
IMK2575
dB Value (06-30)
port 2
* See next page for configurations and attachment options
Tel (401) 683-9700
Fax (401) 683-5571
e-mail: ims@ims-resistors.com
http://www.ims-resistors.com
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Ver 2 1/2011 Specifications Subject to Change Without Notice
IMK2549 Dimensions - Forward Version for Solder or Epoxy Attachment
0.120”
PORT 1
INPUT
PORT 2
THROUGH
0.025”
0.025”
R1
0.055”
GND
0.055”
PORT 4
GND
R2
PORT 3
COUPLED
0.035” MAX.
0.030”
0.030”
Front
Back
0.120”
IMK2550 Dimensions - Reverse Version for Solder or Epoxy Attachment
PORT 2
THROUGH
PORT 1
INPUT
0.025”
0.025”
R1
0.055”
GND
0.055”
PORT 3
COUPLED
R2
PORT 4
GND
0.035” MAX.
0.030”
0.030”
Front
Back
IMK2574 Dimensions - Forward Version for Wirebond
0.120”
PORT 1
INPUT
PORT 2
THROUGH
0.025”
R1
0.055”
GND
PORT 4
GND
R2
PORT 3
COUPLED
0.030”
0.030”
Front
0.035” MAX.
Back
0.120”
IMK2575 Dimensions - Reverse Version for Wirebond
PORT 2
THROUGH
PORT 1
INPUT
0.025”
R1
0.055”
GND
0.120”
IMK2574 & IMK2575 feature
Single-Sided Gold Wirebondable
Terminals on Ports 1-3.
Port 4 (GND) Wraps to Solder
or Epoxyable Backplane.
PORT 3
COUPLED
R2
PORT 4
GND
0.030”
International
Manufacturing
Services, Inc.
Front
0.035” MAX.
Back
DRAWINGS ARE FOR ILLUSTRATIVE PURPOSES ONLY.
DETAILED DIMENSIONAL INFORMATION AVAILABLE FROM FACTORY
Ver 2 1/2011 Specifications Subject to Change Without Notice
Tel (401) 683-9700
Fax (401) 683-5571
e-mail: ims@ims-resistors.com
http://www.ims-resistors.com
www.ims-resistors.com
0.120”
0.120”
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0.120”
IMK2549-30DB Coupling
CH2 S21 log 10 dB/ REF 0dB 1:-30.054 dB
0.0500 GHz
2:-22.404 dB
3.0000 GHz
3:-17.871 dB
6.0000 GHz
Cor
IMK2549-30DB Measured Insertion Loss
CH2 S21 log 10 dB/ REF 0dB 1:-0.2670 dB
0.0500 GHz
2:-0.6450 dB
3.0000 GHz
3:-0.9540 dB
6.0000 GHz
1
Δ
Δ
Δ
Cor
2
3
4
Del
Δ
5
START 0.0500 GHz
CH1 S21 log 10 dB/ REF 0dB 1:-20.039 dB
0.0500 GHz
2:-18.072 dB
3.0000 GHz
3:-14.934 dB
6.0000 GHz
Cor
Smo
START 0.0500 GHz
CH2 S21 log 5 dB/ REF 0dB
Cor
Cor
Includes Fixture Loss
START 0.0500 GHz
STOP
20.0000 GHz
Includes Fixture Loss
START 0.0500 GHz
5:-22.442 dB
20.0000 GHz
STOP 20.0000 GHz
International
Manufacturing
Services, Inc.
Fixture loss was approximately 0.4dB at 6GHz, 0.8dB at 10GHz and 1.6dB at 15GHz.
The above illustrations of corrected data reflect performance of a IMK2549 coupler mounted in a matched
with increasing nominal dB value.
Tel (401) 683-9700
Fax (401) 683-5571
e-mail: ims@ims-resistors.com
http://www.ims-resistors.com
Δ
Δ
1
Δ
2
Δ
3
Δ
4
Δ
5
Δ
Δ
1
Δ
2
Δ
3
Δ
4
Δ
5
4:-10.169 dB
10.0000 GHz
5:-28.829 dB
20.0000 GHz
STOP 20.0000 GHz
Includes Fixture Loss
START 0.0500 GHz
IMK2549-13DB Coupling
1:-12.871 dB
0.0500 GHz
2:-11.852 dB
6.0000 GHz
3:-10.333 dB
10.0000 GHz
4:-12.684 dB
15.0000 GHz
5:-18.735 dB
20.0000 GHz
IMK2549-13DB Measured Insertion Loss
CH2 S21 log 5 dB/ REF 0dB
1:-1.6740 dB
0.0500 GHz
2:-2.3050 dB
6.0000 GHz
3:-2.7360 dB
10.0000 GHz
4:-5.5380 dB
15.0000 GHz
Δ
4
Δ
Δ
1
Δ
2
Δ
3
Δ
4
Includes Fixture Loss
4:-10.182 dB
10.0000 GHz
5:-23.180 dB
20.0000 GHz
STOP 20.0000 GHz
START 0.0500 GHz
IMK2549-20DB Coupling
IMK2549-20DB Measured Insertion Loss
CH1 S21 log 10 dB/ REF 0dB 1:-0.8110 dB
0.0500 GHz
2:-1.1760 dB
3.0000 GHz
3:-1.5680 dB
6.0000 GHz
1
Δ
Δ
Δ
Cor
2
3
4
Del
Δ
5
4:-2.6810 dB
10.0000 GHz
5:-24.774 dB
20.0000 GHz
STOP 20.0000 GHz
Δ
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Δ
5
4:-2.0000 dB
10.0000 GHz
5:-22.357 dB
20.0000 GHz
STOP 20.0000 GHz
Includes Fixture Loss
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Includes Fixture Loss
1
Δ
2
Δ
3
5
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