Influence of uncertainty in dielectric properties on the design performance of a tunable composite right/left handed leaky wave antenna

• Main Authors: Gao, X., Jackson, Timothy James, Gardner, Peter G., Awang Kechik, Mohd Mustafa, Jancar, Bostjan, Ochar, O., Belous, Anatolii Grigorovich
• Format: Conference or Workshop Item
• Language: English
• Published: IEEE 2015
• Online Access: http://psasir.upm.edu.my/id/eprint/55979/1/Influence%20of%20uncertainty%20in%20dielectric%20properties%20on%20the%20design%20performance%20of%20a%20tunable%20composite%20rightleft%20handed%20leaky%20wave%20antenna.pdf; http://psasir.upm.edu.my/id/eprint/55979/

Uncertainties of the order of 8 % in the accuracy of lithography used to define co-planar waveguides on ferroelectric thin films lead to a similar uncertainty in the value of relative permittivity of the film extracted from measurements. When such films are used as the tunable elements in a tunable composite right/left handed leaky wave antenna, such variations of the capacitance of the varactors can lead to a reduction in radiation and total efficiency around of the order of 1 dB in 5 dB due to the appearance of a bandgap in the frequency response.