Beta 1


Title All Electronic Room-Temperature Terahertz Front-Ends for Atmospheric Sounding
Author Nipp, Oliver
Supervisor Krozer, Viktor (Electromagnetic Systems, Ørsted DTU, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Meissner, Peter
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2005
Abstract This work deals with the development and implementation of an exact analytical Schottky-barrier diode model. This model should be useful for microwave engineers who are involved in designing and building circuits and systems which are capable to be operated in the terahertz frequency range. Hence, the model should exactly predict the behavior of a real Schottky-barrier diode. As the title of this work announces, terahertz radiation can be used to analyze the atmosphere and its composition. The most important devices that are needed to generate radiation in the terahertz frequency range are frequency multipliers, which always consist of a high speed non-linear device. In case of room-temperature operation, mostly Schottky-barrier diodes are used for this purpose. This device is also utilized in terahertz receivers to convert RF signals into lower frequency bands. Therefore, exact design tools are needed to optimize the diode for maximum power output and minimum conversion loss at the desired frequencies. Once a model of such diodes is available, the behavior of future multiplier and mixer circuits in the terahertz frequency region can be simulated and evaluated. In this work a model for the ADS program suite has been developed and evaluated regarding its behavior in dc, multiplier and mixer circuits. The model has been approved to be consistent with measurement data for dc and multiplier circuits. This report is structured as follows: Chapter 1: The introductory chapter explains why terahertz radiation is important for several applications and especially for atmospheric sounding. Moreover, terahertz technology is brie°y discussed. Chapter 2: The physics of the Schottky-barrier diode is reviewed and limiting factors are highlighted. Chapter 3: In this chapter the implementation of the theoretical model in an ADS user-de¯ned model is presented in detail. Chapter 4: Several simulations of dc, multiplier and mixer circuits have been carried out, evaluated and veri¯ed in this part. Chapter 5: The results of the work are reviewed and commented. Furthermore, an outlook in regard of future work on this topic is given.
Keywords THz, Schottky diode, THz receiver
Admin Creation date: 2006-06-22    Update date: 2007-02-24    Source: dtu    ID: 186493    Original MXD