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作者 Colom, Jose G
書名 Analysis and development of microstrip interdigitated structures using FDTD and statistical techniques
國際標準書號 059197889X
book jacket
說明 168 p
附註 Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 4322
Adviser: Lynn A. Carpenter
Thesis (Ph.D.)--The Pennsylvania State University, 1998
An analysis of two different microstrip interdigitated couplers is presented in this work. First, the well known Lange coupler is analyzed using FDTD and statistical techniques. By breaking the uniformity of the Lange coupler, a set of pre-determined values is assigned to the different physical parameters of the structure following the Design of Experiment statistical technique. Two metamodels are generated with the output data using a second order polynomial and a radial basis function. With the use of the metamodel, in combination with statistical graphical techniques, an optimum design point is rapidly identified. The results show that by breaking the symmetry of the coupler, there is still room to improve the output response of the circuit. The analysis was performed for a prototype Lange coupler fabricated in the lab, and for a more practical case using FDTD techniques. In both cases it was shown that a better output response is possible if the design is moved away from the nominal input settings
A second interdigitated coupler was also developed in the lab using multilayer techniques. The design is inspired by the "unfolded" Lange coupler version, which works essentially the same as the regular Lange coupler. The new multilayer structure presents some fabrication advantages over the regular Lange coupler which makes it more attractive for mass production and high frequency applications. The new structure does not require the use of bonding wires, and limitations to line widths and spacings are not as strict as for the regular Lange coupler case. The multilayer structure could replace the Lange coupler since it was shown here that the performance of both is essentially the same. An analysis similar to the first part, using FDTD and statistical techniques, is also presented for the new structure. A commercially available Lange coupler was selected to develop a multilayer equivalent structure and compare the results. After the statistical analysis was performed, it was demonstrated that an optimum design for the multilayer case provides as good or better performance than the regular Lange coupler
School code: 0176
DDC
Host Item Dissertation Abstracts International 59-08B
主題 Engineering, Electronics and Electrical
0544
Alt Author The Pennsylvania State University
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