A 94 GHz diode mixer for low LO power operation
ABSTRACT For low LO power and broadband characteristics of the mixer, an antipodal fin-line to microstrip transition for operation in the 94 GHz frequency has been designed and characterized. Back to back transitions fabricated on soft substrates have been measured and simulated to verify their behavior. A single balanced fin-line mixer was designed and fabricated. In the mixer, a wideband fin-line to coplanar waveguide 180° balun and low pass filter were used. Conversion loss is less than 10 dB at LO power of 6 dBm.
Conference Proceeding: Waveguide-to-microstrip transitions for millimeter-wave applications[show abstract] [hide abstract]
ABSTRACT: Design and test data are presented for waveguide-to-microstrip probe transitions that cover millimeter-wave frequencies from 26 to 110 GHz. The broadband design provides a good transition for full-waveguide bandwidth (40%). Because of the compact structure, the measured insertion loss contributed by the transition is less than 0.1 dB in Ka -band, less than 0.2 dB in Q -band and V -band, and less than 0.35 dB in W -band. These transitions are useful for the device and circuit characterisation of millimeter-wave MICs and MMICsMicrowave Symposium Digest, 1988., IEEE MTT-S International; 06/1988
Conference Proceeding: The design of waveguide-to-finline taper transitions at millimetre wave frequencies[show abstract] [hide abstract]
ABSTRACT: Traditional techniques for designing the waveguide-to-finline taper transitions are based on the design a suitable impedance transformation profile first, and then the conversion of this profile into a finline contour. These techniques disregard the electrical discontinuities involved in the transition, such as the step model of two finlines with different widths. This introduces a phase error in the design, because the propagating wave in the taper is not a plane wave if the gradient of the finline contour is not zero. The change of the slotline gap causes changes in the impedance and propagation constant of the slotline, and thus alters the phase in the travelling wave. In this paper, it is demonstrated that there are significant effects related to the electrical discontinuities in the taper shape and that a better understanding of the discontinuities is needed. By compensating the taper phase errors, the return loss could be improved.Microwaves, Radar and Wireless Communications, 2002. MIKON-2002. 14th International Conference on; 02/2002