In this paper, the design and simulation of a symmetrical waveguide filter are presented based on insertion loss method. The designed WR-34 is operating at 28 GHz, where its dimensions a=4.32mm b=8.64mm, fractional bandwidth 2.15% return level better than 16 dB, frequency range from 22Ghz to 33 GHz. structure 5 th -order bandpass with five resonators six circular inductive irises. order optimiz...

© Appl. Rheol. 20 (2010) 63293 DOI: 10.3933/ApplRheol-20-63293 Abstract: Bitumen is undoubtedly the most important material in the construction and rehabilitation of flexible road pavements. By increasing the temperature, bitumen changes from brittle solid, to viscoelastic solid and finally to Newtonian fluid. The rheological characteristics of bitumen also vary greatly due to aging, which is a...