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Microwave bandstop filters using novel artificial periodic substrate electromagnetic band gap structures
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
Department of Electronic Production, Mid Sweden University, ITM, Campus Östersund.
2009 (English)In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 32, no 2, 273-282 p.Article in journal (Refereed) Published
Abstract [en]

Novel microwave and millimeterwave (mm-wave) bandstop filters using artificial periodic substrate electromagnetic bandgap (EBG) are investigated in this paper. Three types of microstrip structures using periodically modified trace width, patterned dielectric substrate, and periodically modified ground plane are treated, respectively. By periodically modifying either the width of the conductor trace, the substrate height, or the dielectric constant of a standard microstrip transmission line, it has been possible to design microwave bandstop filter functions with wide stopband characteristics and reduced size, compared to conventional microwave/RF filter structures. Commercial electronic design automation (EDA) and computational electromagnetic tools such as Agilent's advanced design system (ADS) and CST Microwave Studio are used in the design and simulations of these filter structures. The effects of the physical parameters of the structures on the filter characteristic are studied. The design procedure and simulation results are described and possible applications of these filter structures are discussed in this paper. A particularly wide stopband is achieved by the circuits presented in this paper, which use only a few cell elements. A significant performance improvement of microstrip patch antenna has been observed by implementing one of the presented EBG periodic substrate structures.

Place, publisher, year, edition, pages
2009. Vol. 32, no 2, 273-282 p.
Keyword [en]
Bandstop filter (BSF); Electromagnetic bandgap (EBG); Microstrip; Microwave; Millimeterwave (mm-wave); Photonic bandgap (PBG); s-parameters; Bandstop filter (BSF); Electromagnetic bandgap (EBG); Microstrip; Millimeterwave (mm-wave); Photonic bandgap (PBG); s-parameters; Antennas; Bandpass filters; Cell membranes; Computer aided design; Dielectric materials; Electromagnetism; Energy gap; Microstrip antennas; Microwaves; Millimeter waves; Notch filters; Optical filters; Periodic structures; Scattering parameters; Spontaneous emission; Substrates; Microwave filters
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6950DOI: 10.1109/TCAPT.2009.2018833ISI: 000268282800007Scopus ID: 2-s2.0-68349154344OAI: oai:DiVA.org:kth-6950DiVA: diva2:11806
Note
QC 20100810. Uppdaterad från Submitted till Published, titel ändrad, tidiagre titel: "Microwave bandstop filters using artificial periodic substrate photonic band gap" 20100810.Available from: 2007-04-10 Created: 2007-04-10 Last updated: 2010-08-12Bibliographically approved
In thesis
1. Some Aspects of Advanced Technologies and Signal Integrity Issues in High Frequency PCBs, with Emphasis on Planar Transmission Lines and RF/Microwave Filters
Open this publication in new window or tab >>Some Aspects of Advanced Technologies and Signal Integrity Issues in High Frequency PCBs, with Emphasis on Planar Transmission Lines and RF/Microwave Filters
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The main focus of this thesis is placed on high frequency PCB signal Integrity Is-sues and RF/Microwave filters using EBG structures.

From the signal Integrity aspect, two topics were mainly discussed. On one hand, the effect of increasing frequency on classical design rules for crosstalk reduction in PCBs was investigated experimentally and by full-wave simulations. An emphasis was placed on the 3×W spacing rule and the use of guard traces. Single-ended and differential transmission lines were considered. S-parameter measurements and simu-lations were carried out at high-frequency (up to 20 GHz). The results emphasize the necessity to reevaluate traditional design rules for their suitability in high frequency applications. Also, the impacts of using guard traces for high frequency crosstalk re-duction were clearly pointed out. On the other hand, the effect of high loss PCB ma-terials on the signal transmission characteristics of microstrip lines at high frequency (up to 20 GHz) was treated. Comparative studies were carried out on different micro-strip configurations using standard FR4 substrate and a high frequency dielectric ma-terial from Rogers, Corporation. The experimental results highlight the dramatic im-pact of high dielectric loss materials (FR4 and solder mask) and magnetic plating metal (nickel) on the high frequency signal attenuation and loss of microstrip trans-mission lines.

Besides, the epoxy-based SU8 photoresist was characterized at high frequency (up to 50 GHz) using on-wafer conductor-backed coplanar waveguide transmission lines. A relative dielectric constant of 3.2 was obtained at 30 GHz. Some issues related to the processing of this material, such as cracks, hard-skin, etc, were also discussed.

Regarding RF/Microwave filters, the concept of Electromagnetic Band Gap (EBG) was used to design and fabricate novel microstrip bandstop filters using periodically modified substrate. The proposed EBG structures, which don’t suffer conductor backing issues, exhibit interesting frequency response characteristics.

The limitations of modeling and simulation tools in terms of speed and accuracy are also examined in this thesis. Experiments and simulations were carried out show-ing the inadequacies of the Spice diode model for the simulations in power electronics. Also, an Artificial Neural Network (ANN) model was proposed as an alternative and a complement to full-wave solvers, for a quick and sufficiently accurate simulation of interconnects. A software implementation of this model using Matlab’s ANN toolbox was shown to considerably reduce (by over 800 times) the simulation time of microstrip lines using full-wave solvers such as Ansoft’s HFSS and CST’s MWS.

Finally, a novel cooling structure using a double heatsink for high performance electronics was presented. Methods for optimizing this structure were also discussed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xvii, 77 p.
Series
Trita-ICT/MAP, 2007:03
Keyword
Signal integrity, crosstalk, guard trace, PCB, transmission line loss, high frequency measurement, dielectric, SU-8, electromagnetic bandgap, microwave filter
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4324 (URN)978-91-7178-605-0 (ISBN)
Public defence
2007-04-17, Rum 5435, KTH-Electrum, Isafjordsg. 22, Kista, 10:00
Opponent
Supervisors
Note
QC 20100809Available from: 2007-04-10 Created: 2007-04-10 Last updated: 2011-09-30Bibliographically approved

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