Abstract
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.
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References
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© 2009 Springer-Verlag Berlin Heidelberg
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Hu, X., He, S. (2009). Compact Dual-Band Rat-Race Coupler Based on a Composite Right/Left Handed Transmission Line. In: Zouhdi, S., Sihvola, A., Vinogradov, A.P. (eds) Metamaterials and Plasmonics: Fundamentals, Modelling, Applications. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9407-1_21
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DOI: https://doi.org/10.1007/978-1-4020-9407-1_21
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-9406-4
Online ISBN: 978-1-4020-9407-1
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