Open AccessOn the applicability of numerical tools for simulating wave-ports close to the cutoff frequency
Author(s) -
Eman M. Eldesouki,
Khalid Mustafa Ibrahim,
Ahmed M. Attiya
Publication year - 2022
Publication title -
international journal of power electronics and drive systems/international journal of electrical and computer engineering
Language(s) - English
Resource type - Journals
eISSN - 2722-2578
pISSN - 2722-256X
DOI - 10.11591/ijece.v12i2.pp1724-1731
Subject(s) - hfss , reflection coefficient , feko , waveguide , cutoff frequency , cutoff , computer science , reflection (computer programming) , acoustics , cad , port (circuit theory) , computer aided design , french horn , optics , antenna (radio) , physics , electronic engineering , engineering , telecommunications , engineering drawing , microstrip antenna , quantum mechanics , programming language , operating system
This paper focuses on a common drawback in electromagnetic numerical computer aided design computer aided design (CAD) tools: high frequency structure simulator (HFSS), computer simulation technology (CST) and FEKO, where the excitation by using a wave-port below and close to the cutoff frequency has unreliable values for the reflection coefficient. An example for such problem is presented in the design of a dual horn antenna fed by two different waveguide sections. To overcome this numerical error in the results of these CAD tools, a tapered waveguide section is used in the simulation as an excitation mechanism to the feeding waveguide. The cross section of the input port at this tapered waveguide section is designed to have a cutoff frequency smaller than the lowest frequency under investigation for the original problem. Then, by extracting the effect of the tapered section from the obtained reflection coefficient, it would be possible to obtain the reflection coefficient of the original problem.