US 3,936,838 A · Multimode coupling system including a funnel-shaped multimode coupler

Abstract

A multimode coupling system includes a funnel-shaped coupling member having one coupling aperture at the narrow end thereof, one larger coupling aperture at the larger end thereof, and a plurality of coupling apertures in the side wall thereof. A first and second of these side wall apertures lie in a first common plane on diametrically opposite surfaces of the member. A third and fourth of these apertures lie in a second common plane orthogonal to the first and on diametrically opposite surfaces of the member. A coupling circuit is provided between the plurality of side wall coupling apertures and an asymmetrical mode terminal for advancing the phase of signals at the first and third side wall apertures approximately 90.degree. relative to the phase of signals at the second and fourth side wall apertures to thereby achieve coupling of asymmetrical mode signals between the larger end and the asymmetrical mode terminal.

Claims23

Dependent claims

A coupling system for symmetrical mode signals and asymmetrical mode signals comprising:

a hollow truncated cone shaped member having tapering side walls and two orthogonal symmetry planes and a first opening at one end and a larger opening at the opposite end, said first opening at one end adapted to present a low reflection coefficient coupling path to symmetrical mode signals,
an asymmetrical mode signal terminal,
first and second coupling apertures in the tapering side wall of said hollow member with said first and second side wall apertures at diametrically opposite surfaces of said member in one of said symmetry planes,
third and fourth coupling apertures in the tapering side wall of said hollow member with said third and fourth side wall apertures at diametrically opposite surfaces of said member in the second of said orthogonal symmetry planes,
and coupling means coupled between said first, second, third and fourth apertures and said asymmetrical mode signal terminal characterized by a response to signals at said terminal for coupling equal portions of the signal energy at the terminal to said first, second, third and fourth apertures with the phase of the coupled signals at the first and third apertures being advanced 90.degree. relative to the phase of the signals at the second and fourth apertures.

2 more elements

A feed system for receiving or transmitting first signals over a first band of frequencies and for receiving polarization diverse difference tracking signals over a narrower band of frequencies within said first band of frequencies, said feed system comprising:

a hollow truncated cone shaped member having tapering side walls and two orthogonal symmetry planes and a first opening at one end adapted to be coupled to a transmitter or a receiver and a larger opening at the opposite end adapted to be coupled to free space,
a first pair of coupling apertures in the tapering side wall of said hollow member at diametrically opposite surfaces of the member in one of said symmetry planes,
a second pair of coupling apertures in the tapering side wall of said hollow member at diametrically opposite surfaces of the member in the second of said symmetry planes,
a first tracking terminal for sensed angle tracking errors in said one symmetry plane and a second tracking terminal for sensed angle tracking errors in said second plane,
angle sensing comparator means coupled between both said first and second pair of apertures and said first and second tracking terminals for receiving and angle sensing polarization diverse tracking signals within said narrower band of frequencies to provide first angle sensed tracking error signals at said first terminal and to provide second orthogonal angle sensed error signals at said second terminal.

2 more elements

Dependencies are inferred from the claim text.

Multimode coupling system including a funnel-shaped multimode coupler

Life of this patent

Multimode coupling system including a funnel-shaped multimode coupler

Life of this patent

Abstract

Claims23