Volume 23, Issue 1, December 2013

Design of Pyramidal Absorber Based on Anisotropic Material [Full Text]

A.R. Mallahzadeh and M. Zarei 

Abstract—In this article a pyramidal absorber with anisotropic material is presented. In an isotropic material, the material response depends on the relative direction of applied field. In other words the polarization vector can take a different direction with respect to the direction of applied field. The loss tangent of the proposed anisotropic material is considered a diagonal tensor and the influence of each tensor component on the absorber performance is studied. Then, based on these simulations the absorber is designed. Such an absorber is more efficient than the conventional one. According to the simulations performed through CST microwave studio software, the reflectivity of the proposed unit cell pyramidal absorber is 6 dB lower than the conventional one. 


A Defected Half Mode Substrate Integrated Waveguide (D-HMSIW) Band-pass Filter with T-extension for Ku-Band Applications [Full Text]

Sourav Moitra, Basudeb Mondal, Pushpita Tapu, A. K. Mukhopadhyay and A. K. Bhattacharjee    

Abstract—A Novel Defected Half Mode Substrate Integrated Waveguide (D-HMSIW) filter with Band-pass property has been presented in this article over a substrate with dielectric constant 3.2 and material thickness of 30mils. Single and multiple T- extensions have been implemented over the HMSIW structure to obtain the band-pass characteristics. The design is extremely simple and the pass-band can be obtained at other frequencies by simple alterations of the dimension of the T-slots. The filter finds applications in Ku band operations with advantages like convenient integration, compact size, low cost and ease in fabrication.