https://www.comsol.com/blogs/modeling-branch-line-coupler
When modeling a branch line coupler with COMSOL Multiphysics, you can compute the S-parameters and evaluate the phase difference to ensure its accuracy.
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https://www.tractorsupply.com/tsc/product/rca-cat-5e-6-in-line-coupler-white-6033136
Buy RCA CAT-5E/6 in.-Line Coupler, White at Tractor Supply Co. Great Customer Service.
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