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S-band Coaxial Cavity Diplexers

At Finash Tech., we design, develop, and deliver microwave coaxial cavity diplexers in standard frequency bands, as well as customized solutions to meet specific requirements. We provide diplexers for both low and high-power applications. Diplexers are often used to combine the transmit and receive chains of a communication system, and our diplexers meet high isolation and low loss standards. Our coaxial technology diplexers cover the frequency range of 1 GHz to 8 GHz, with channel bandwidths ranging from a few MHz to several GHz.

S-band Diplexer internal structure

Tested and Tuned Diplexer

Unassembled Diplexer with top lid unscrewed

Finished Product coated with black lacquer, weight :200 grams, Length:130 mm, Width: 52mm, Height=28mm

Channel 1 is of 40MHz bandwidth


Channel 2 is of 30 MHz bandwidth


Inter-channel isolation is around 80 dB, insertion loss @fc≤1.2dB

Measured Frequency response of the Diplexer

Environmental
Qualification:

Similar products have been qualified according to MIL-STD 810G standards for vibration, shock, and thermal conditions

Measured Frequency response of the Diplexer

Test Conditions

  1. Each Diplexer has been independently tuned, and tested using  R&S  vector network analyzer ZVA-40.

  2. Port2 is connected to  channel 1

  3. Port1 is connected to channel 2

  4. Port3 is connected to  Antenna common port

  5. All measurements are made at ambient temperature of ~ 20á´¼C

  6. Measured S-parameters are re-plotted in circuit simulator

  7. Measured S-parameters data can be shared in touch-stone format

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