Sensitivity analysis of input impedance of a large loop antenna in a waveguide to tilt angle

Pelin N.M.H. Salem, Edip Niver, Mohamed A. Salem

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A large circular loop antenna is used to excite the TE41 mode at operation frequency of 9 GHz inside a circular waveguide section to launch a vortex beam. The antenna is located inside the waveguide such that the real part of its input impedance is equal to 50 Ω. A reactive element is used to match the antenna to a 50 Ω voltage source. We perform a parametric study on the effect of small tilts of the antenna on the input impedance. The study is performed using multi-level fast multipole method (MLFMM) full-wave simulations. Results show that for this design, a tilt in the range ±2 along the antenna axis with a tilt of up to +3 perpendicular to the antenna axis is tolerable without noticeable degradation in the launcher performance.

Original languageEnglish (US)
Title of host publication2018 Asia-Pacific Microwave Conference, APMC 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9784902339451
StatePublished - Jul 2 2018
Externally publishedYes
Event30th Asia-Pacific Microwave Conference, APMC 2018 - Kyoto, Japan
Duration: Nov 6 2018Nov 9 2018

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference30th Asia-Pacific Microwave Conference, APMC 2018

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Antenna design methods
  • Antenna tolerance analysis
  • Impedance matching
  • Loop antennas
  • Waveguide antennas


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