Title :
A planar quasi-optical mixer using a folded-slot antenna
Author :
Robertson, S.V. ; Katehi, L.P.B.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI
fDate :
4/1/1995 12:00:00 AM
Abstract :
A quasioptical mixer using only planar structures such as coplanar-waveguide and slotline is presented. The mixer, which can be scaled for millimeter-wave applications and placed on a substrate lens, uses orthogonal modes in a folded-slot antenna to achieve intrinsic RF/LO isolation without BF filtering or subharmonic pumping. The folded-slot balanced mixer was fabricated on RT/Duriod and obtained a minimum isotropic conversion loss of 1.2 dB at 11.6 GHz. Numerical integration of full two-dimensional antenna patterns yielded an antenna directivity of 7 dB, corresponding to a single side-band (SSB) mixer conversion loss of 8.2 dB. The mixer demonstrated -18 dB RF/IF isolation and -30 dB LO/IF isolation
Keywords :
MIMIC; coplanar waveguides; millimetre wave mixers; slot antennas; slot line components; 1.2 dB; 11.6 GHz; 8.2 dB; LO/IF isolation; RF/IF isolation; RT/Duriod; SSB mixer conversion loss; antenna directivity; coplanar-waveguide; folded-slot antenna; intrinsic RF/LO isolation; isotropic conversion loss; millimeter-wave applications; orthogonal modes; planar quasi-optical mixer; slotline; substrate lens; two-dimensional antenna patterns; Coplanar waveguides; Infrared detectors; Low pass filters; Microwave theory and techniques; Millimeter wave circuits; Millimeter wave technology; Radio frequency; Slot antennas; Slotline; Solid state circuits;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
