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WR08 with UG-387/U-M Flange "Impedance"

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uri1636

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1. I need to design and fabricate microstrip array antennas at frequency (100-140)GHz for my Ph.D. research.
2. The fabricate antennas will be check with VNA including extender to frequency range (90-140)GHz
3. The extender have WR08 waveguide with UG-387/U-M Flange.
4. My microstrip array antenna will be with waveguide input compatible to WR08 with UG-387/U-M Flange, and after that I will use corporate feed to feed 8x8 radiating patch at the microstrip array antenna.
5. What is "impedance" of WR08 waveguide?
6. I know that the waveguide doesn't have a real impedance, but each of radiating elements at the microstrip array antenna have impedance, and I need to do impedance matching for main waveguide WR08 input.
 

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