Waveguide structure for separating microwaves with mutually orth

Details Waveguide structure for separating microwaves with mutually orth Waveguide structure for separating microwaves with mutually orth

1983-03-25

1985-02-05

LaRoche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333137, 333251, 333 21A, 333208, 333212, 343756, H01P 1213, H01P 116

Patent

active

044980620

ABSTRACT:
A waveguide structure carrying microwaves with two mutually orthogonal planes of polarization and in two different frequency bands, transmitted and received by an associated antenna, comprises two orthomode transducers in the form of coaxial cylindrical guide members of different inner diameters, the smaller-diameter transducer terminating in a short-circuiting end wall while the larger-diameter transducer, adjoining same at an annular shoulder, extends to a feed horn confronting a reflector. Each transducer is formed with two elongate peripheral access slots, opening onto respective rectangular-section branches, which are longitudinally bisected by mutually perpendicular axial planes while being relatively offset in axial direction. Each slot of the larger-diameter transducer is partly traversed by two pairs of conductive dividers, at locations spaced from its ends by about a quarter of the slot length and of a height equal to about a third of the slot width, serving to suppress the propagation of higher modes of higher-frequency waves in the respective branch guides.

REFERENCES:
patent: 2432093 (1947-12-01), Fox
patent: 2684469 (1954-07-01), Sensiper
patent: 2921274 (1960-01-01), Dascotte
patent: 3201717 (1965-08-01), Grosbois et al.
patent: 4047128 (1977-09-01), Morz
patent: 4410866 (1983-10-01), Bui-Hai
Article by Robert W. Gruner titled "Compact Dual-Polarized Diplexers for 4/6-GHz Earth Station Applications", published in the 1977 Proceedings of the IEEE Symposium on Antenna Propagation, pp. 341-344.

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