A comprehensive approach to microwave filter design which exploits accurate filed simulations dri... more A comprehensive approach to microwave filter design which exploits accurate filed simulations driven directly by a gradient-based minimax optimizer is presented. Challenges of efficiency, discretization of geometrical dimensions, and continuity of optimization variables are reconciled by a three-stage attack: (1) efficient response interpolation; (2) smooth gradient estimation; and (3) dynamic database updating. The design optimization of two microstrip filters illustrates
All rights reserved. Printed and bound in the United States of America. No part of this book may ... more All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark.
Page 1. A 10 GHz Thin Film Lumped Element High Temperature Superconductor Filter Daniel G. Swanso... more Page 1. A 10 GHz Thin Film Lumped Element High Temperature Superconductor Filter Daniel G. Swanson, Jr., *Roger Forse, and *BOO JL Nilsson Watkins-Johnson Company, Palo Alto, CA *Superconductor Technologies Inc., Santa Barbara, CA ...
Proceedings of 1995 IEEE MTT-S International Microwave Symposium, 1995
Within an integrated parallel optimization framework, we are able, for the first time, to apply e... more Within an integrated parallel optimization framework, we are able, for the first time, to apply electromagnetic (EM) optimization to the yield-driven design of microstrip circuits of arbitrary geometries. Parallel optimization handles the massive demand on computer resources, due to the large number of designable parameters describing an arbitrary geometry and the large number of simulations involved in yield optimization. Our parallel strategy can be implemented over local and wide area networks supporting heterogeneous workstations.<<ETX>>
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as micro-strip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This
International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering, 1995
Page 1. Optimizing a Microstrip Bandpass Filter Using Electromag netics Daniel G. Swanson, Jr. Wa... more Page 1. Optimizing a Microstrip Bandpass Filter Using Electromag netics Daniel G. Swanson, Jr. Watkins-Johnson Company, 3333 Hillview Avenue, Palo Alto, California 94304 Received February 16, 1995; revised April 20, 1995. ABSTRACT ...
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as micro-strip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This
2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157)
We analyze a combline filter using the Finite Element Method (FEM) with ports where the tuning sc... more We analyze a combline filter using the Finite Element Method (FEM) with ports where the tuning screws would normally be. The filter is tuned with a circuit simulator using the multiport S-parameter data and lumped capacitors at the ports. We can then optimize the combline filter very rapidly by mapping the “coarse” circuit model to the “fine” FEM model. This
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as microstrip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This is particularly true in multilayer environments such as MMIC's, packages and printed circuit boards (PCB's). In all of these environments, we have the freedom to design transmission lines that may not fit any of the conventional definitions. We may need microstrip or CPW with a dielectric overlay for an MMIC or package. In a multilayer PCB, we may have a buried stripline conductor with grounded isolations strips in close proximity and upper/lower ground planes that are not symmetrically located. This configuration is some kind of stripline/CPW hybrid depending on the strip widths and the various ground plane spacings. For any strip configuration, the effects of strip thickness and the actual strip cross-section due to etching or other processing are al...
In this tutorial we will replicate a design example that has been used by others. The design goal... more In this tutorial we will replicate a design example that has been used by others. The design goal is an N=5 bandpass filter with 10% bandwidth centered at 3 GHz. Ten mil thick alumina was chosen for the substrate. At this frequency we would typically choose 20 or 25 mil thick alumina and widen the resonator strips to reduce the insertion loss. A thicker substrate will increase the coupling between resonators while wider strips will decrease the coupling. Using Dishal’s K&Q method [1,2] we can rapidly get to an EM based prototype of the filter. Figure 1 shows the EM simulations used to center the resonator frequency and find the correct tap point.
Incomplete specifications on new products are very common resulting in unreliable products and co... more Incomplete specifications on new products are very common resulting in unreliable products and costly scope creeps and design changes. Designing out failures using lessons learned can result in very high reliability and significantly lower warranty costs. The quickest way to make use of the lessons learned is to learn from heuristics which are short statements based on wisdom from lessons learned over many products. The article covers examples to show how the heuristics were applied to successful products. INDEX TERMS Customer requirements, design for reliability, design for durability, durability, durability requirements, environmental requirements, failure modes and effects analysis, functional performance, life cycle cost, reliability requirements, reliability test plan, requirements analysis, safety critical failure, user interface requirements.
1994 IEEE MTT-S International Microwave Symposium Digest (Cat. No.94CH3389-4)
Page 1. TU3E-5 AN HTS END-COUPLED CPW FILTER AT 35 GHZ Daniel G. Swanson, Jr. Roger J. Forse* Wat... more Page 1. TU3E-5 AN HTS END-COUPLED CPW FILTER AT 35 GHZ Daniel G. Swanson, Jr. Roger J. Forse* Watkins-Johnson Company *Superconductor Technologies Inc. Abstract Using conventional thin-film metalization schemes ...
Workers in industry and academia have been writing numerical codes to solve electromagnetic field... more Workers in industry and academia have been writing numerical codes to solve electromagnetic fields problems for several decades. These programs were often written - on main frame computers with little thought given to portability or the user interface. Only in the past few years have commercial general purpose electromagnetic field solvers become available to the engineering community. These commercial efforts are the result of advances in software and the development of low cost UNIX workstations. These commercial codes offer new opportunities for the microwave engineering community to validate existing analytical models, create new models and solve complex structures that cannot be reduced to an analytical model. This paper will briefly review the methods used in commercial electromagnetic field solvers and present some examples of their use in an engineering environment.
A comprehensive approach to microwave filter design which exploits accurate filed simulations dri... more A comprehensive approach to microwave filter design which exploits accurate filed simulations driven directly by a gradient-based minimax optimizer is presented. Challenges of efficiency, discretization of geometrical dimensions, and continuity of optimization variables are reconciled by a three-stage attack: (1) efficient response interpolation; (2) smooth gradient estimation; and (3) dynamic database updating. The design optimization of two microstrip filters illustrates
All rights reserved. Printed and bound in the United States of America. No part of this book may ... more All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark.
Page 1. A 10 GHz Thin Film Lumped Element High Temperature Superconductor Filter Daniel G. Swanso... more Page 1. A 10 GHz Thin Film Lumped Element High Temperature Superconductor Filter Daniel G. Swanson, Jr., *Roger Forse, and *BOO JL Nilsson Watkins-Johnson Company, Palo Alto, CA *Superconductor Technologies Inc., Santa Barbara, CA ...
Proceedings of 1995 IEEE MTT-S International Microwave Symposium, 1995
Within an integrated parallel optimization framework, we are able, for the first time, to apply e... more Within an integrated parallel optimization framework, we are able, for the first time, to apply electromagnetic (EM) optimization to the yield-driven design of microstrip circuits of arbitrary geometries. Parallel optimization handles the massive demand on computer resources, due to the large number of designable parameters describing an arbitrary geometry and the large number of simulations involved in yield optimization. Our parallel strategy can be implemented over local and wide area networks supporting heterogeneous workstations.<<ETX>>
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as micro-strip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This
International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering, 1995
Page 1. Optimizing a Microstrip Bandpass Filter Using Electromag netics Daniel G. Swanson, Jr. Wa... more Page 1. Optimizing a Microstrip Bandpass Filter Using Electromag netics Daniel G. Swanson, Jr. Watkins-Johnson Company, 3333 Hillview Avenue, Palo Alto, California 94304 Received February 16, 1995; revised April 20, 1995. ABSTRACT ...
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as micro-strip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This
2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157)
We analyze a combline filter using the Finite Element Method (FEM) with ports where the tuning sc... more We analyze a combline filter using the Finite Element Method (FEM) with ports where the tuning screws would normally be. The filter is tuned with a circuit simulator using the multiport S-parameter data and lumped capacitors at the ports. We can then optimize the combline filter very rapidly by mapping the “coarse” circuit model to the “fine” FEM model. This
Microwave circuit simulators have models for all the traditional transmission line cross-sections... more Microwave circuit simulators have models for all the traditional transmission line cross-sections such as microstrip, stripline and coplanar-waveguide (CPW). However, there are cases that the standard models do not cover. This is particularly true in multilayer environments such as MMIC's, packages and printed circuit boards (PCB's). In all of these environments, we have the freedom to design transmission lines that may not fit any of the conventional definitions. We may need microstrip or CPW with a dielectric overlay for an MMIC or package. In a multilayer PCB, we may have a buried stripline conductor with grounded isolations strips in close proximity and upper/lower ground planes that are not symmetrically located. This configuration is some kind of stripline/CPW hybrid depending on the strip widths and the various ground plane spacings. For any strip configuration, the effects of strip thickness and the actual strip cross-section due to etching or other processing are al...
In this tutorial we will replicate a design example that has been used by others. The design goal... more In this tutorial we will replicate a design example that has been used by others. The design goal is an N=5 bandpass filter with 10% bandwidth centered at 3 GHz. Ten mil thick alumina was chosen for the substrate. At this frequency we would typically choose 20 or 25 mil thick alumina and widen the resonator strips to reduce the insertion loss. A thicker substrate will increase the coupling between resonators while wider strips will decrease the coupling. Using Dishal’s K&Q method [1,2] we can rapidly get to an EM based prototype of the filter. Figure 1 shows the EM simulations used to center the resonator frequency and find the correct tap point.
Incomplete specifications on new products are very common resulting in unreliable products and co... more Incomplete specifications on new products are very common resulting in unreliable products and costly scope creeps and design changes. Designing out failures using lessons learned can result in very high reliability and significantly lower warranty costs. The quickest way to make use of the lessons learned is to learn from heuristics which are short statements based on wisdom from lessons learned over many products. The article covers examples to show how the heuristics were applied to successful products. INDEX TERMS Customer requirements, design for reliability, design for durability, durability, durability requirements, environmental requirements, failure modes and effects analysis, functional performance, life cycle cost, reliability requirements, reliability test plan, requirements analysis, safety critical failure, user interface requirements.
1994 IEEE MTT-S International Microwave Symposium Digest (Cat. No.94CH3389-4)
Page 1. TU3E-5 AN HTS END-COUPLED CPW FILTER AT 35 GHZ Daniel G. Swanson, Jr. Roger J. Forse* Wat... more Page 1. TU3E-5 AN HTS END-COUPLED CPW FILTER AT 35 GHZ Daniel G. Swanson, Jr. Roger J. Forse* Watkins-Johnson Company *Superconductor Technologies Inc. Abstract Using conventional thin-film metalization schemes ...
Workers in industry and academia have been writing numerical codes to solve electromagnetic field... more Workers in industry and academia have been writing numerical codes to solve electromagnetic fields problems for several decades. These programs were often written - on main frame computers with little thought given to portability or the user interface. Only in the past few years have commercial general purpose electromagnetic field solvers become available to the engineering community. These commercial efforts are the result of advances in software and the development of low cost UNIX workstations. These commercial codes offer new opportunities for the microwave engineering community to validate existing analytical models, create new models and solve complex structures that cannot be reduced to an analytical model. This paper will briefly review the methods used in commercial electromagnetic field solvers and present some examples of their use in an engineering environment.
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Papers by Daniel Swanson