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Measurement of Efficiency for power combiner

Measurement of Efficiency for power combiner. Circuit Topology. Use 50 Ohms transmision line to replace the MMICs Waveguide environment Slotline-to-microstrip transition

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Measurement of Efficiency for power combiner

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  1. Measurement of Efficiency for power combiner

  2. Circuit Topology • Use 50 Ohms transmision line to replace the MMICs • Waveguide environment • Slotline-to-microstrip transition • From 2 trays to 6 trays, different schemes are tested. ( The 6 metal cards are always mounted, but circuit tray number varies.) Through property for 6*4 array power combiner

  3. Impedance of bond wire B C Bond wire 1 1 • Total A, B, C, D 4 connection for each path • For each connection, 6*0.001” gold wire • From 1 -> 1, 1.4 Ohm • From 3 -> 3, 0.8 Ohm • From 5 -> 5, 1.4 Ohm • From Gnd -> Gnd, 0.2 Ohm D A 3 3 Gnd Gnd 5 5 Through property for 6*4 array power combiner

  4. S parameters of 2-Trays combiner S parameters: • S11 < - 11 dB • S21 vary from - 1.1 dB to - 1.5 dB Comparison : • Low insertion loss • Low return loss • The best among all Through property for 6*4 array power combiner

  5. S parameters of 6-Trays combiner S parameters: • S11 < - 8 dB • S21 vary from - 1.3 dB to - 2.4dB Comparison : • Low insertion loss, but higher than 2 and 4 trays • Return loss is higher than 2 and 4 trays too Through property for 6*4 array power combiner

  6. Over-sided 8-Trays combiner 8-Tray Power-Combiner WR-94 Wave-guide WR-94 Wave-guide • 8-Tray power-combiner is tested • To hold more circuit trays, an over-sided wave-guide is used • The taper wave-guide has showed low reflection, and could match well with WR-94 wave-guide Oversized taper Wave-guide Oversized taper Wave-guide Through property for 6*4 array power combiner

  7. Waveguide Taper Structure • Linear Taper Transition • Oversized Waveguide Opening (1.12 in. x 0.9 in.) • 4 in. Transition Each Side Oversized Waveguide Environment to Accommodate the 8-Tray System Standard Opening Oversized Opening Through property for 6*4 array power combiner

  8. S parameters of 8-Trays combiner S parameters: • S11 < - 7.6 dB • S21 vary from - 1.1 dB to - 2.5 dB Comparison : • Insertion loss is higher Through property for 6*4 array power combiner

  9. Power Combiner How the loss is calculated? • The loss is evaluated by the ratio of the output power over the power which could be transmitted forward. No incident wave at Port2 (Radiation & conduction loss) Through property for 6*4 array power combiner

  10. N-way Combiner System How the efficiency is calculated? • Li = Lo , and is half of the total loss ( in dB). • The Efficiency is calculated on one side antenna array, and is Li or Lo on percent. Through property for 6*4 array power combiner

  11. Loss of 2-Trays combiner S parameters: • S21 has ripples due to reflection of antenna Loss : • Loss is lower than S21 • Insertion loss is almost constant over all frequency • Average loss is –1.30 dB • Average Efficiency is 86.1% Through property for 6*4 array power combiner

  12. Loss of 6-Trays combiner S parameters: • S21 is lower than 2-trays Loss : • Loss is more than 2-Trays • Average loss is –1.30 dB • Average Efficiency is 86.1% Through property for 6*4 array power combiner

  13. Loss of 8-Trays combiner S parameters: • S21 has ripples due to reflection of antenna Loss : • Average loss is –1.34 dB • Average Efficiency is 85.7% Through property for 6*4 array power combiner

  14. Summary • The power combiner’s efficiency keeps at constant around 86% when the active device increase from 8 to 32 pieces. Through property for 6*4 array power combiner

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