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Compact Down-Conversion Mixer Design Employing a Wide and Deep Stop-Band DGS-LPF

Mouloud Challal 1, Mokrane Dehmas 1, Arab Azrar 1, Rabia Aksas 2, and Mohamed Trabelsi 2
1. Dept. of Electronics, Signals and Systems Laboratory, IGEE, University of Boumerdes, Boumerdes, Algeria
2. Dept. of Electronics, Ecole Nationale Polytechnique, Algiers, Algeria
Abstract—This paper investigates a compact 24-GHz hybrid down-conversion mixer. The proposed mixer is based on a wide and deep stop-band low pass filter, four Schottky diodes, two hybrid couplers and an open stub. The unwanted harmonics are rejected by means of a filter based on three uniforms dumbbell-shaped defected ground structure and a compensated microstrip line. A good conversion loss of 2.19dB, 1-dB compression point of 3-dBm and an LO-to-RF isolation better than 35dB are obtained. The validity of the mixer configuration and the design procedure are confirmed by a comparison between simulation results and measurements data reported in literature. 
 
Index Terms—open stub, coupler, Defected Ground Structure (DGS), Low Pass Filter (LPF)

Cite: Mouloud Challal, Mokrane Dehmas, Arab Azrar, Rabia Aksas, and Mohamed Trabelsi, "Compact Down-Conversion Mixer Design Employing a Wide and Deep Stop-Band DGS-LPF," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 6, pp. 520-524, December 2016. doi: 10.18178/ijeee.4.6.520-524
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