BibTeX:

@article{IJIRSTV2I9066,
     title={Hermetically Sealed Aperture Coupled Ka-Band Waveguide-to-Microstrip Transition for Space Applications},
     author={Raval Vidhi P and Nimesh Prabhakar},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={2},
     number={9},
     pages={146--150},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV2I9066.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

This paper presents design of millimeter-wave transition from waveguide to Microstrip. Transition designed is an aperture coupled transition where energy coupling from Microstrip line is done through slot in its ground plane to metal patch element placed on other side of substrate. Critical parameters of design are optimized by using a 3-D solver ANSOFT HFFS software tool and return loss better than 15 dB and its minimum insertion loss is 0.37dB over 34.5GHz–36GHz frequency range for back-back structure. The small aperture design offers low radiation loss, miniaturized design and is reasonably insensitive to mechanical misalignment between waveguide and Microstrip circuit.

Microstrip transitions, aperture coupled, hermetically sealed, ka-band, waveguide transition