https://doi.org/10.1140/epjd/e2013-30068-0
Regular Article
Investigation on capacitively loaded microstrip line
1 Department of Physics, Sharif
University of Technology, P.O. Box
11365-9567,
Tehran,
Iran
2 Young research club, Islamic Azad
University, Bonab
branch, Bonab,
Iran
3 Department of Physics, Faculty of
Sciences, Azarbaijan Shahid Madani University, 53714-161
Tabriz,
Iran
4 Department of Laser and Optical
Engineering, University of Bonab, 5551761167
Bonab,
Iran
a e-mail: h.masalehdan@gmail.com,
masalehdan@azaruniv.edu
b e-mail: siavash.lotfi@yahoo.com
Received:
26
January
2012
Received in final form:
6
December
2012
Published online:
5
April
2013
In this work, a microstrip transmission line with a planar left-handed structure, is investigated. Negative μ is achieved by creating periodic capacitive slots in the conducting strip of line. By using the transmission matrix method for periodic structures, these slots are analyzed. To this end, the unit cell is considered as a combination of two series capacitors and a section of transmission line, and then the transmission matrix of this unit cell is calculated. The dispersion relation verifies the existence of a stop band with a negative magnetic permeability (μ < 0) below the cut-off frequency. The width of stop band can be controlled by changing the structure dimensions.
Key words: Optical Phenomena and Photonics
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013