Title :
Multifrequency Waveguide Orthomode Transducer
Author :
Sharma, Shashi Bhushan ; Singh, Vijay Kumar ; Chakrabarty, Soumyabrata
Author_Institution :
Antenna Syst. Group, Indian Space Res. Organ., Ahmedabad, India
Abstract :
This paper presents the design and development of a multifrequency probe-coupled orthomode transducer (OMT) using a circular waveguide as the primary waveguide and a rectangular waveguide as the secondary waveguide. Design is presented for a common OMT operating at 6.6, 10.65, 18, and 21 GHz using four cascaded circular waveguide sections with different cross-sectional dimensions. An innovative design technique is used to minimize the inter-port coupling and to maximize the power in the dominant mode to get the required radiation performance at all the frequency bands using a common radiating aperture. The simulated and measured parameters of the OMT and the horn fed by this OMT have been presented.
Keywords :
circular waveguides; rectangular waveguides; transducers; 10.65 GHz; 18 GHz; 21 GHz; 6.6 GHz; cascaded waveguide; circular waveguide; corrugated horn; inter-port coupling; multifrequency orthomode transducer; probe coupling; radiating aperture; rectangular waveguide; Aperture antennas; Frequency; Microwave antennas; Probes; Radiometers; Rectangular waveguides; Satellite antennas; Transducers; Waveguide discontinuities; Waveguide junctions; Cascaded waveguide; corrugated horn; multifrequency orthomode transducer (OMT); probe coupling;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.852754