Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 4 Kleinheubacher Berichte 2005 2006 10.5194/ars-4-21-2006 http://www.adv-radio-sci.net/4/21/2006/ http://www.adv-radio-sci.net/4/21/2006/ars-4-21-2006.html http://www.adv-radio-sci.net/4/21/2006/ars-4-21-2006.pdf 21 24 2006-09-04 A varactor tuned low-cost 24 GHz harmonic VCO M. O. Olbrich L. Huang E. M. Biebl Fachgebiet Höchstfrequenztechnik, Technische Universität München, 80290 München, Germany We present a low-cost 24 GHz VCO that is based on a microstrip design combined with discrete packaged devices. The output frequency is generated by a harmonic oscillator. The tunabilty was reached using a varactor diode. Two versions of the VCO were built, one has a wide tuning range of 1.1 GHz and the other one has a high output power of 3.7 dBm. Stelzer,~A., Höftenberger,~J., Ettinger,~K., and Weigel,~R.: Generation of Precise Frequency Ramps for FSCW Applications with a Fractional-N PLL at 24 GHz, European Microwave Conference, EuMC, Munich, Germany, 2003. \bibitem [Jeon et~al.(1996)Jeon, Tchah, Yim and Chung]chung1 Jeon, S., Tchah, K., Yim, C., and Chung, S.: "Voltage Tuned Dielectric Resonance 20.5GHz Harmonic Oscillator with Novel Structure", 2003 IEEE MTT-S Int. Microwave Symp. Dig., 3, 1519–1522, June 1996. \bibitem [Khanna and Hauptman(1991)]khanna_yig Khanna, A P S. and Hauptman, J.: 8-40 GHz 13 dBm low noise GaAs FET YIG tuned oscillator, 1991 IEEE MTT-S Int. Microwave Symp. Dig., 1, 209–212, 1991. \bibitem [Chua et~al.(1987)Chua, Desoer and Kuh]chua Chua, L., Desoer, C., and Kuh, E.: Linear and Nonlinear Circuits, New York: McGraw-Hill, 1987. \bibitem [Khanna(1985)]khanna_sp Khanna, A S.: Three-port S-parameters ease GaAs FET designing, Microwaves and RF, 2, 81–84, 1985.