Title :
A turnstile junction waveguide orthomode transducer
Author :
Navarrini, Alessandro ; Plambeck, Richard L.
Author_Institution :
Radio Astron. Lab., Univ. of California, Berkeley, CA
Abstract :
An orthomode transducer with a circular waveguide input and two rectangular waveguide outputs is described. The design utilizes a turnstile junction and two E-plane power combiners. A K-band version of this device has been constructed and tested. From 18 to 26 GHz, the input reflection coefficient was less than -19 dB, the cross-polarization was less than -48 dB, and the transmission loss was ~0.15 dB. We estimate the mechanical tolerances that would be required to scale this device to the 200-270-GHz band for use in a dual-polarization radio-astronomy receiver
Keywords :
microwave receivers; millimetre wave receivers; power combiners; radio receivers; rectangular waveguides; 18 to 26 GHz; 200 to 270 GHz; E-plane power combiners; circular waveguide; cross-polarization; mechanical tolerances; orthomode transducer; radio-astronomy receiver; rectangular waveguides; transmission loss; turnstile junction waveguide; Dielectric substrates; Electromagnetic waveguides; Pins; Polarization; Power combiners; Propagation losses; Rectangular waveguides; Testing; Transducers; Waveguide junctions; Polarimetry; power combiner; radio astronomy; turnstile junction; waveguide transitions;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.860505
