A Simple Asymmetric Orthomode Transducer Based on Groove Gap Waveguide
Journal article, 2020

The groove gap waveguide (GGWG) technology is used to design a simple asymmetric orthomode transducer (OMT) at the Ka-band in this letter. The OMT consists of two metal layers which do not need electrical contact due to the property of the gap waveguide technology. The vertical polarization (VP) is directly fed to a standard rectangular waveguide port from the main arm of a square waveguide, while the horizontal polarization (HP) is fed to the side arm by an H-bend. No septum or iris is needed, which contributes to a simple structure. The OMT has been manufactured and measured using a back-to-back setup. A high isolation of over 40 dB is achieved within the working band from 26.1 to 29.3 GHz. The reflection coefficient is below -11.4 and -17.7 dB for the HP and VP, respectively. The higher return loss of the HP is caused mainly by the manufacturing errors. Nevertheless, the insertion loss for both polarizations is below 0.25 dB for a single OMT.

Asymmetric orthomode transducer (OMT)

Ka-band

groove gap waveguide (GGWG)

Author

Yu Quan

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

Jian Yang

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

Hao Wang

Nanjing University of Science and Technology

Ashraf Uz Zaman

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

IEEE Microwave and Wireless Components Letters

1531-1309 (ISSN)

Vol. 30 10 953-956

Subject Categories

Other Engineering and Technologies not elsewhere specified

Other Physics Topics

Condensed Matter Physics

DOI

10.1109/LMWC.2020.3016333

More information

Latest update

12/18/2020