Model: SWN-2181-TRA-T

PMI Model No. SWN-2181-TRA-T is a pin diode transfer switch that operates over the 7.0 to 18.0 GHz frequency range.  This transfer switch is uniquely designed to allow only one path on at a time while unused ports are terminated.  Furthermore, this model also incorporates a TTL compatible driver for ease of system integration.


Quick Links: (click the links below for additional information)

Product Feature

Test Report

Appendix C- Qualification & Testing
ATP - Acceptance Test Report
QTP - Qualification Test Report (Inlcudes MTBF)



Frequency 7.0 to 18.0 GHz
RF Power Handling 2 Watts
(30% Duty Cycle and 130 µs Pulse Width)
Isolation 60 dB Min* - Measured 71.5 dB
Insertion Loss 5.0 dB Max ** - Measured 4.7 dB
Insertion Loss Ripple 0.3 dB Max over any 500 MHz bandwidth within 7.0 to 18.0 GHz
Measured <0.3 dB
(Into Termination/Source of 1.3:1)

1.6:1 Max (Port Selected)
Measured 1.58:1
2.0:1 Max (Port Not Selected)***
Measured 1.92:1

Command Logic


DC Power Dissipation

2.25 W

Switch Delay 500 ns Max - Measured 55 ns
Size 1.50" x 1.25" x 0.50"
38.10 mm x 31.75 mm x 12.70 mm
(Final Dimensions Prior to Finishing)
Weight 0.21 lbs Max
Sealing Hermetically Sealed
Finish Painted Blue


*Measure and record S21 from 6.0 to 18.0 GHz (1201 Points), with the DC voltage supply set to > 2.6 V (Pulse Modulator in
the off state). Isolation will be verified from this data.
**Insertion Loss shall be measured with the control signal relative to its return (i.e. On or Low Loss State) over the

frequency range of 7.0 to 18.0 GHz.
***VSWR required only during functional vibration.


Environmental Ratings:

Temperature -30 ºC to +85 ºC Operating
-55 ºC to +95 ºC Non-Operating
Humidity MIL-STD-810, Method 507.5, Procedure II

MIL-STD-810, Method 516, Procedure II

Solvent Resistance MIL-STD-202, Method 215
Altitude MIL-STD-202, Method 105 (50,000 ft)
Seal MIL-STD-202, Method 112, Cond C & E
Internal Water MIL-STD-883, Method 1018
Temperature Cycle MIL-STD-202, Method 107D, Cond A