On improvement of the radiation performance of the open-ended circular waveguide


  • Sergei P. Skobelev Moscow Institute of Physics and Technology; Joint-Stock Company "Radiophyzika", Russian Federation




circular waveguide, conical horn, feeds, feed horns, hard surfaces, hard horns


The cross-polar performance is analyzed for radiation of the TE11mode from the open-ended circular waveguide of typical diameter of around one wavelength. The internal waveguide surface at the end is loaded with a finite longitudinally corrugated section with grooves filled with dielectric. The analysis is based on the mode-matching method combined with a factorization method, taking into account all the effects associated with wave scattering at the open end. It is shown that the width of the frequency band where the cross-polar level is not higher than -30 dB can potentially be made a few times wider in comparison with the 27% bandwidth corresponding to the ordinary circular waveguide. The influence of the higher-order modes excited at the aperture on the radiation performance is also discussed.


Aizenberg, G.Z.; Yampolsky, V.G.; Teryoshin, O.N. Antennas of UHF. Vol. 1. Moscow: Svyaz Press, 1977 (in Russian).

Gorobets, N.N.; and Shishkova, A.V. Rigorous calculation of cross polarization radiation of an open-ended circular waveguide. Proc. of 12th Int. Crimean Conf., CriMiCo'2002, Sep. 9-13, 2002, Sevastopol, Crimea, Ukraine, pp. 351-352.

James, G.E.; Greene, K.J. Effect of wall thickness on radiation from circular waveguides. Electron. Lett., 16th Feb. 1978, Vol. 14, No. 4, p. 90-91.

Fradin, A.Z. A square pyramidal horn with identical radiation patterns in the E and H planes. Electrical Communications, 1961, No. 9, pp. 39-43.

Scharten, T.; Nellen, J.; van den Bogaart, F. Longitudinally slotted conical horn antenna with small flare angle. IEE Proc., June 1981, Vol. 128, Pt. H, p. 117-123.

Aly, M.S.; Mahmoud, S.F. Propagation and radiation behaviour of a longitudinally slotted horn with dielectric-filled slots. IEE Proc., Dec. 1985, Vol. 132, Pt. H, No. 7, p. 477-479.

Kildal, P.-S. Definition of artificially soft and hard surfaces for electromagnetic waves. Electron. Lett., Feb. 4, 1988, Vol. 24, p. 168-170.

Weinstein, L.A. The Theory of Diffraction and the Factorization Method. Boulder, Colo.: Golem, 1969.

Skobelev, S.P.; Kildal, P.-S. Analysis of a hard corrugated conical horn by using the method of generalised scattering matrices. Proc. of the 11th Int. Conf. on Antennas and Propagation, ICAP2001, Manchester, UK, 17-20 April 2001, Vol. 2, pp. 696-700.

Skobelev, S.P.; Kildal, P.-S. Design of a dual-polarized horn antenna with very high aperture efficiency by using PBG hard surface walls. Proc. of the 24th ESTEC Antenna Workshop, Noordwijk, The Netherlands, 30 May - 1 June 2001, pp. 97-102.

Skobelev, S.P.; Kildal, P.-S. Influence of hard corrugated PBG wall design on performance of conical horn antenna. Microwave and Optical Technology Letters, Vol. 32, No. 4, Feb. 20, 2002, pp. 265-268.

Kildal, P.-S.; Kishk, A.; Sipus, Z. Asymptotic boundary conditions for strip-loaded and gated surfaces. Microwave and Optical Tech. Letters, Feb. 5, 1997, Vol. 14, pp. 99-101.

Skobelev, S.P.; Kildal, P.-S. Eigenmodes of a circular waveguide with 'hard' wall on the basis of a strip-loaded dielectric layer. Radio and Communication Technology, 2000, No. 12, pp. 54-57.





LGA, printed antennas, antennas for mobile communication