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The document describes an air-filled substrate integrated waveguide (AFSIW) to microstrip directional coupler that was designed for high-performance microwave systems. The coupler takes advantage of the multilayer structure of AFSIW technology to couple the signal from the inner AFSIW to a top microstrip line, allowing connection to off-the-shelf MMIC detectors. A prototype 25-35 GHz coupler was fabricated and achieved a measured insertion loss of 3.53 dB, coupling of 26.55 dB, return loss over 11 dB, and i

Author

asem elfeky

Language

EN