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CPW to Rectangular Waveguide Transition on an {\hbox {LiNbO}}_{3} Substrate

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6 Author(s)
Shireen, R. ; Dept. of Electr. & Comput. Eng., Univ. of Delaware, Newark, DE ; Shouyuan Shi ; Peng Yao ; Schuetz, C.A.
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This paper presents transition from coplanar waveguide (CPW) to rectangular waveguide for W -band (75-110 GHz) operations. The waveguide consists of a cosine-shaped fin extending from the upper waveguide wall onto the CPW signal electrode. The design features direct integration of the waveguide with opto-electronic devices on lithium niobate (LiNbO3) for the applications of millimeter wave to optical signal processing. Simulations and measurements show that the model works very well over the entire W-band. Measurements of fabricated devices have yielded return loss of more than 10 dB and insertion loss of about 2.8 dB over the operating bandwidth.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 6 )