SENSITIVITY ANALYSIS OF ITERATIVE ADJOINT TECHNIQUE FOR MICROSTRIP CIRCUITS OPTIMIZATION

This paper presents an accurate and efficient full-wave method, combined with iterative adjoint technique, for analyzing sensi- tivities of planar microwave circuits with respect to design parameters. Method of moments (MoM) in spatial domain is utilized, and general- ized conjugate residual iterative scheme is applied to solve the linear matrix equations with fast convergence. Green's functions for multilayer planar structures in DCIM form are employed to simplify the spatial domain manipulation. In the present method, a conventional integration model and the corresponding adjoint model are solved by MoM respec- tively. The adjoint technique, with the aid of iterative schemes, could significantly reduce the computational requirements, especially for the large electrical size device with many perturbing design parameters. Numerical results of S-parameter sensitivities of a low-pass microstrip filter by the present method are presented. Accuracy and efficiency are validated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 607- 609, 2007; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.22204

[1]  J.P. Walko,et al.  RF S-parameter degradation under hot carrier stress , 2004, 2004 IEEE International Reliability Physics Symposium. Proceedings.

[2]  Jeen-Sheen Row,et al.  Design of an annular-ring microstrip antenna for circular polarization , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[3]  L. Pantisano,et al.  RF performance vulnerability to hot carrier stress and consequent breakdown in low power 90 nm RFCMOS , 2003, IEEE International Electron Devices Meeting 2003.

[4]  J.F. Kang,et al.  Strain-induced very low noise RF MOSFETs on flexible plastic substrate , 2005, Digest of Technical Papers. 2005 Symposium on VLSI Technology, 2005..

[5]  J. R. James,et al.  Microstrip Antenna Theory and Design , 1981 .

[6]  H.L. Kao,et al.  Modeling RF MOSFETs after electrical stress using low-noise microstrip line layout , 2005, 2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers.

[7]  Eisuke Nishiyama,et al.  Stacked microstrip antenna for wideband and high gain , 2004 .

[8]  Gui-Bin Hsieh,et al.  Gain enhancement of a circularly polarized equilateral-triangular microstrip antenna with a slotted ground plane , 2003 .

[9]  G. Y. Delisle,et al.  Discrete image theory for horizontal electric dipoles in a multilayered medium , 1988 .

[10]  S. Glavic,et al.  Feasible adjoint sensitivity technique for EM design optimization , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[11]  Daniël De Zutter,et al.  Shape sensitivities of capacitances of planar conducting surfaces using the method of moments , 1996 .

[12]  S. Mudanai,et al.  Predictive compact modeling of NQS effects and thermal noise in 90nm mixed-signal/RF CMOS technology , 2004, IEDM Technical Digest. IEEE International Electron Devices Meeting, 2004..

[13]  J.W. Bandler,et al.  Adjoint techniques for sensitivity analysis in high-frequency structure CAD , 2004, IEEE Transactions on Microwave Theory and Techniques.

[14]  P. Packan,et al.  A comparison of state-of-the-art NMOS and SiGe HBT devices for analog/mixed-signal/RF circuit applications , 2004, Digest of Technical Papers. 2004 Symposium on VLSI Technology, 2004..

[15]  G. E. Howard,et al.  A closed-form spatial Green's function for the thick microstrip substrate , 1991 .

[16]  Meng Zhang,et al.  Low profile spiral antenna with PBG substrate , 2000 .

[17]  Daniël De Zutter,et al.  A new method for obtaining the shape sensitivities of planar microstrip structures by a full-wave analysis , 1996 .

[18]  J. C. Beal,et al.  Multilayer microstrip structure analysis with matched load simulation , 1995 .