A hybrid technique for analyzing corrugated and noncorrugated rectangular horns

A hybrid technique is proposed to solve the entire problem of corrugated and noncorrugated rectangular horns without the usual approximations. The horn antenna is simulated by a multistepped waveguide structure radiating into half-space. The procedure is composed of three steps. First, assuming the horn to be terminated by infinite metallic flange, the aperture problem is accurately solved by a hybrid modal-spectral method (HMSM). Second, the modal analysis (MA) method and scattering matrix concept of waveguide discontinuities are employed to solve the transverse multidiscontinuity problems. Finally, the two methods are combined (MA-HMSM) to solve the entire problem of the horn antenna. The proposed technique allows to obtain not only the radiation patterns, but also the reflection and near-field characteristics of the horn, without any restriction on the geometry (semiflare angles, profiled horn contours, corrugations). A good agreement between theoretical predictions and experimental results has been obtained for several horns.

[1]  R. Macphie,et al.  Radiation from a rectangular waveguide with infinite flange--Exact solution by the correlation matrix method , 1980 .

[2]  E. Jull,et al.  Reflection from the aperture of a long E -plane sectoral horn , 1972 .

[3]  R. Macphie,et al.  Scattering at Rectangular-to-Rectangular Waveguide Junctions , 1982 .

[4]  A. Wexler.  Solution of Waveguide Discontinuities by Modal Analysis , 1967 .

[5]  R. J. Luebbers,et al.  Analysis of Thick Rectangular Waveguide Windows with Finite Conductivity , 1973 .

[6]  F. Arndt,et al.  Double-Plane Steps in Rectangular Waveguides and Their Application for Transformers, Irises, and Filters , 1982 .

[7]  P.J.B. Clarricoats,et al.  Propagation and radiation behaviour of corrugated feeds. Part 1: Corrugated-waveguide feed , 1971 .

[8]  M. Narasimhan,et al.  Hybrid modes in corrugated conical horns , 1970 .

[9]  Y.C. Shih,et al.  Convergence of Numerical Solutions of Step-Type Waveguide Discontinuity Problems by Modal Analysis , 1983, 1983 IEEE MTT-S International Microwave Symposium Digest.

[10]  P.J.B. Clarricoats,et al.  Propagation and radiation behaviour of corrugated feeds , 1972 .

[11]  A. Rudge,et al.  Handbook of Antenna Design, Vol. 1 , 1982 .

[12]  J. Encinar,et al.  Accurate analysis of feed-horns by a new hybrid modal-spectral method , 1985, 1985 Antennas and Propagation Society International Symposium.

[13]  P. A. McInnes,et al.  Corrugated rectangular horns for use as microwave feeds , 1975 .

[14]  P.J.B. Clarricoats,et al.  Propagation and radiation characteristics of corrugated horns , 1973 .

[15]  B. Thomas,et al.  A method of synthesizing radiation patterns with axial symmetry , 1966 .

[16]  G. P. Srivastava,et al.  Theoretical analysis of hybrid modes in a dual-depth corrugated waveguide feed , 1982 .

[17]  P. McInnes,et al.  A rectangular corrugated feed horn , 1975 .

[18]  J. A. Encinar,et al.  Convergence of Numerical Solutions of Open-Ended Waveguide by Modal Analysis and Hybrid Modal-Spectral Techniques. , 1985, 1985 IEEE MTT-S International Microwave Symposium Digest.

[19]  P.J.B. Clarricoats,et al.  Computer field-matching solution of waveguide transverse discontinuities , 1971 .

[20]  E. Kuhn,et al.  Rectangular Corrugated Horns - Analysis, Design and Evaluation , 1984, 1984 14th European Microwave Conference.

[21]  G. H. Bryant.  Propagation in corrugated waveguides , 1969 .

[22]  G. James,et al.  Design of wide-band compact corrugated horns , 1984 .

[23]  B. V. Rao,et al.  Diffraction by wide-flare-angle corrugated conical horns , 1970 .