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Waveguide Transition for Submillimeter-Wave MMICsAn integrated waveguide-to-MMIC (monolithic microwave integrated circuit) chip operating in the 300-GHz range is designed to operate well on high-permittivity semiconductor substrates typical for an MMIC amplifier, and allows a wider MMIC substrate to be used, enabling integration with larger MMICs (power amplifiers). The waveguide-to- CBCPW (conductor-backed coplanar waveguide) transition topology is based on an integrated dipole placed in the E-plane of the waveguide module. It demonstrates low loss and good impedance matching. Measurement and simulation demonstrate that the loss of the transition and waveguide loss is less than 1-dB over a 340-to-380-GHz bandwidth. A transition is inserted along the propagation direction of the waveguide. This transition uses a planar dipole aligned with the maximum E-field of the TE10 waveguide mode as an inter face between the waveguide and the MMIC. Mode conversion between the coplanar striplines (CPS) that feed the dipole and the CBCPW transmission line is accomplished using a simple air-bridge structure. The bottom side ground plane is truncated at the same reference as the top-side ground plane, leaving the end of the MMIC suspended in air.
Document ID
20090041784
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other - NASA Tech Brief
Authors
Leong, Kevin M.
(Northrop Grumman Corp. United States)
Deal, William R.
(Northrop Grumman Corp. United States)
Radisic, Vesna
(Northrop Grumman Corp. United States)
Mei, Xiaobing
(Northrop Grumman Corp. United States)
Uyeda, Jansen
(Northrop Grumman Corp. United States)
Lai, Richard
(Northrop Grumman Corp. United States)
Fung, King Man
(California Inst. of Tech. Pasadena, CA, United States)
Gaier, Todd C.
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
December 1, 2009
Publication Information
Publication: NASA Tech Briefs, December 2009
Subject Category
Man/System Technology And Life Support
Report/Patent Number
NPO-46237
Distribution Limits
Public
Copyright
Public Use Permitted.
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