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SMT Isolators and Circulators

Smiths Interconnect has over a decade’s experience designing and producing Surface Mount Technology, SMT Isolators and Circulator suitable for pick and place and reflow soldering. Devices have been produced in a variety of frequencies from L to X-band for applications which include communications, commercial avionics and large AESA programs using Surface Mount Technology (SMT).

Features & Benefits

Over the years the range has continued to expand to ensure designers have access to the widest choice of robust and reliable products available as single junction Isolators & Circulators or dual junction Duplexers.

Recent product development has focused on improving the breadth of the frequency bands serviced, the electrical performance achievable,  and extending the peak power handling. These improvements have been delivered by paying particular attention to ferrite selection and magnetic bias combined with improvements in mechanical packaging that aid and assist the re-flow process including device footprint & interface pre-tinning.

The C-band Radalt SMT Isolator opposite has been supplied for over 15 years and is used in a radar altimeter used in more than 50% of the world’s commercial air transport fleet.

Operating Band [GHz] Function Base Package Footprint WDH [mm x mm] Power Handling [W Peak] Notes
This table lists the basic information for a range of typical designs. Electrical specification is dependent on several factors including operating bandwidth, temperature and RF peak power. Please contact the factory for performance data.
1.2 to 1.4 Circulator 25.4 x 25.4 x 7.8 450 This is a “T” configuration device.
1.2 to 1.4 Isolator 25.4 x 31.7 x 7.8 450 Termination rating is specification dependant.
1.2 to 1.4 Duplexer 25.4 x 59.0 x 7.8 450 3 and 4 access port variants available.
2.7 to 3.3 Circulator 19.05 x 19.05 x 6.35 200 A more compact version operating at 40W CW.
2.7 to 3.3 Isolator 19.05 x 25.4 x 6.35 200 Termination rating is specification dependant.
2.7 to 3.3 Duplexer 19.05 x 44.1 x 6.35 200 3 and 4 access port variants available.
2.7 to 3.1 Circulator 19.05 x 19.05 x 6.35 200 This is a “T” configuration device.
2.7 to 3.1 Isolator 19.05 x 25.4 x 6.35 200 Termination rating is specification dependant.
2.7 to 3.1 Duplexer 19.05 x 44.1 x 6.35 200 This is a “T” configuration device.
2.9 to 3.4 Isolator 19.05 x 19.05 x 6.30 200 Termination rating is specification dependant.
2.9 to 3.4 Circulator 19.05 x 25.5 x 6.30 200 This is a “T” configuration device.
2.9 to 3.4 Duplexer 19.05 x 46.5 x 6.30 200 3 and 4 access port variants available.
3.1 to 3.5 Isolator 12.7 x 12.7 x 6.35 200 This is a “T” configuration device.
3.1 to 3.5 Circulator 12.7 x 19.05 x 6.35 200 This is a “T” configuration device.
3.1 to 3.5 Duplexer 12.7 x 25.4 x 6.35 200 3 and 4 access port variants available.
5.2 to 5.9 Circulator 12.7 x 12.7 x 5.1 50 This is a “T” configuration device.
5.2 to 5.9 Isolator 12.7 x 25.4 x 5.1 50 Termination rating is specification dependant.
5.2 to 5.9 Circulator 12.7 x 24.6 x 5.1 50 This is a “T” configuration device.
8.0 to 12.0 Circulator 12.7 x 12.7 x 3.5 50 This is a “T” configuration device.
8.0 to 12.0 Isolator 12.7 x 10.0 x 3.5 50 This is a “T” configuration device.
8.0 to 12.0 Duplexer 12.7 x 16.0 x 3.5 50 Refer to factory for alternative footprints.

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