Dual linear and dual circular polarization antenna

摘要

A feed network (22) for an antenna system (20), e.g., a phased array antenna system, which is operatively associated with a signal source (18,19,28,29), e.g., satellite-based transponders, which generates first and second R.F. signals (T1,T2) of circular polarization, and third and fourth R.F. signals (T3,T4) of orthogonal linear polarizations. The feed network (22) includes a 3dB hybrid coupler (32) or the like for splitting each of the first and second R.F. signals into first and second signal components (T1a,b, T2a,b) disposed in phase quadrature with each other. Facilities are provided for applying the first signal components of the first and second R.F. signals, and the third R.F. signal, to a first beam forming network (BFN) (58); and, for separately applying the second signal components of the first and second R.F. signals, and the fourth R.F. signal, to a second BFN (59). Subsequent to their emergence from the BFN's, the first and second signal components of each of the first and second R.F. signals are applied to respective through and side ports (68a-n) of ortho-mode-tees (OMT's) (69a-n) which function to re-combine the first and second signal components, in phase quadrature, in order to thereby produce output first and second R.F. signals (T1,T2) of opposite-sense (i.e., dual) circular polarizations. The third and fourth R.F. signals (T3,T4) pass unaffected through the OMT's (69a-n) as output third and fourth R.F. signals of orthogonal (i.e., dual) linear polarizations. The first, second, third, and fourth output R.F. signals (T1-T4) are then fed through common transmission lines to excite the individual antenna elements of the antenna system.;In an alternative embodiment, the feed network has an architecture which is virtually identical to that of the preferred embodiment described above, except that pin polarizers (109a-n) or the like are provided between the OMT's (69a-n)and the antenna elements (62a-c). However, in the alternative embodiment, the first and second R.F. signals are of orthogonal linear polarizations, and the third and fourth R.F. signals are of opposite-sense circular polarizations. The first and second signal components of the first and second R.F. signals are re-combined at the OMT's to produce intermediate first and second R.F. signals of opposite-sense circular polarizations. The pin polarizers function to convert the intermediate first and second R.F. signals to orthogonally linearly polarized output first and second R.F. signals. The first, second, third, and fourth R.F. signals of both of the above-described embodiments preferably occupy different frequency bands.