The dimensions of the ports of the coaxial to waveguide adapters in the X-band that I designed are as follows: 5.08 * 22.86 And 2.8 * 22.86 Now my questions are:
1- Do I just have to measure the adapters with a 50 ohm waveguide load a quarter of the wavelength?
2. For each of the adapters, should the size of the waveguide load port be the same as the adapter port?
3- Reference for designing 50 ohm waveguide load, please introduce because waveguide loads available in the market with dimensions of 11.16 * 22.86 are standard and are larger than my adapter ports.
Thank you dear friends and engineers
you can read the following links:
1. https://nvlpubs.nist.gov/nistpubs/jres/70C/jresv70Cn2p127_A1b.pdf
2. https://www.pasternack.com/pages/RF-Microwave-and-Millimeter-Wave-Products/waveguide-to-coax-adapters.html
3. https://apps.dtic.mil/sti/pdfs/ADA425440.pdf
4. https://eriinc.com/product/coaxial-and-waveguide-test-adapters/
I meant, just take 2 adapters, connect them head to head, and measure with VNA.
Convert full S matrix to ABCD_summ, which is ABCD_single^2, find ABCD_single, and convert back to S. The system is reciprocal, so your ABCD matrices.
It is the same technique as de-embedding.
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