A Simple Coaxial to Circular Waveguide OMT for Low-Power Dual-Polarized Antenna Applications

A simple design for an orthomode transducer (OMT) is proposed for low-power antenna applications, such as receiver antennas as well as laboratory testing antennas. The design exploits detuning pins to enable enlarging the higher order mode-free bandwidth in an asymmetric configuration without compro...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2018-01, Vol.66 (1), p.109-115
Main Authors: Moharram, Mohamed A., Mahmoud, Abdelhady, Kishk, Ahmed A.
Format: Article
Language:English
Subjects:
Antennas
Bandwidth
Bandwidths
Cavity resonators
Communication satellites
Couplings
Design optimization
Dual polarization (waves)
Orthomode transducer (OMT)
Pins
polarization duplexer
polarizer
Ports (Computers)
Resonant frequency
Satellite communications
Single mode operation
Transducers
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Description
Summary:A simple design for an orthomode transducer (OMT) is proposed for low-power antenna applications, such as receiver antennas as well as laboratory testing antennas. The design exploits detuning pins to enable enlarging the higher order mode-free bandwidth in an asymmetric configuration without compromising the port isolation. The design guidelines are presented for a scalable design. Moreover, the design is optimized to utilize all the single-mode operation bandwidth of the circular waveguide, covering the satellite communications band in North America (i.e., from 11.7 to 14.2 GHz). The presented OMT features a port coupling level below -34 dB. The measurement results are in a very good agreement with the full-wave analysis simulations.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2017.2734089