Compact Dual-Band Rat-Race Coupler Based on a CompositeRight/Left Handed Transmission Line
2009 (English)In: METAMATERIALS AND PLASMONICS: FUNDAMENTALS, MODELLING, APPLICATIONS / [ed] Zouhdi S; Sihvola A; Vinogradov AP, Springer , 2009, 281-287 p.Conference paper (Refereed)
A general model for dual band rat-race couplers is presented through an odd-even mode analysis approach. The requirements for the impedances and electrical lengths of the branches are derived. To verify this model, a dual-band rat-race coupler is designed utilizing the balanced composite right/left handed transmission line. The whole structure is much more compact than the existing dual-band rat-race couplers and easy to fabricate. The simulated results are given. Return loss and port isolation of better than -30 dB are achieved at the central frequencies of both operating bands. Furthermore, the requirements of equal amplitude and balanced phase conditions are well fulfilled (within 0.5 dB and 5) over a frequency range of almost 50 and 90 MHz at the two central frequencies.
Place, publisher, year, edition, pages
Springer , 2009. 281-287 p.
, NATO Science for Peace and Security Series B - Physics and Biophysics, ISSN 1871-465X
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-10135DOI: 10.1007/978-1-4020-9407-1-21ISI: 000263452900021ScopusID: 2-s2.0-77949439735ISBN: 978-1-4020-9405-7OAI: oai:DiVA.org:kth-10135DiVA: diva2:209447
NATO Advanced Research Workshop on Metamaterials for Secure Information and Communication Technologies, Marrakech, MOROCCO, MAY 07-10, 2008
QC 201007202009-03-252009-03-252013-11-19Bibliographically approved