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Compact wide-band coaxial-to-waveguide transitions for 8…18 GHz and 18…26 GHz


V.A. Rudakov – Post-graduate Student, Department of Applied Electrodynamics and Computer Simulation, Southern Federal University (Rostov-on-Don). E-mail:
V.A. Sledkov – Ph. D. (Phys.-Math.), Leading Research Scientist, Southern Federal University (Rostov-on-Don). E-mail:
A.P. Mayorov – Head of Department, Research Institute «Spetsvuzavtomatika» (Rostov-on-Don) M.B. Manuilov – Dr. Sc. (Phys.-Math.), Professor, Department of Applied Electrodynamics and Computer Simulation, Southern Federal University (Rostov-on-Don). E-mail:

A variety of coaxial-to-rectangular waveguide transitions including the right-angle transitions as well as the collinear transitions are used for many microwave applications. However, their disadvantages are narrow operational frequency band or relatively large dimensions and complicated design. To eliminate these disadvantages, a novel compact design of the wide-band right-angle coaxial-to-rectangular waveguide transition has been proposed. The coaxial-to-rectangular waveguide transition for 18…26 GHz frequency band and coaxial-to-double-ridged waveguide transition for 8…18 GHz frequency band are studied in the paper. SMA coaxial connector is adopted as an input port. The waveguide ports have standard cross sections 11×5.5 mm for rectangular waveguide (18…26 GHz) and 17.551×8.153 mm for double-ridged waveguide (8…18 GHz). The waveguide section is milled in the metal plate in the form of a ridged or double-ridged waveguide to improve the impedance matching. The coaxial line is inserted directly into the waveguide flange. The central coaxial line conductor has got a stepped transition and a cylindrical sleeve which is positioned on the end of the conductor. The dielectric probe is placed between the ridge and the coaxial probe to fix the coaxial probe. The suggested designs of the coaxial-to-waveguide transitions have been successfully fabricated for operation within 18…26 GHz and 8…18 GHz. The 18…26 GHz transition shows the measured VSWR less than 1.3. The couple of 8…18 GHz transitions connected in a back-to-back configuration have measured VSWR less than 1.4. The both transitions have very compact dimensions, which correspond to standard waveguide flanges (29×29×10 mm for 18…26 GHz band and 35×35×13.6 mm for 8…18 GHz band). Novel designs of the compact wide-band coaxial-to-rectangular waveguide transitions are proposed, successfully manufactured and tested for operation within18…26 GHz and 8…18 GHz. The proposed design concept may be implemented in the other frequency bands. The proposed compact design of coaxial-to-waveguide transitions provide excellent electrical performances which correspond to the best world analogue. The designed transitions were employed for feeding of wide-band horn antennas.

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