Abstract: An antenna assembly for receiving television signals on both very high frequency (VHF) bands and ultra high frequency (UHF) bands, the antenna assembly including: a main section including an elongated boom, at least one active element coupled to the boom, and at least one passive element coupled to the boom; a VHF section including a VHF boom configured to be coupled to a first longitudinal end of the boom and at least one active element coupled to the VHF boom; and a UHF section including a UHF boom configured to be coupled to a second longitudinal end of the boom opposite the first longitudinal end and a plurality of passive elements coupled to the UHF boom.

Abstract: An antenna assembly for receiving television signals on both very high frequency (VHF) bands and ultra high frequency (UHF) bands, the antenna assembly including: a main section including an elongated boom, at least one active element coupled to the boom, and at least one passive element coupled to the boom; a VHF section including a VHF boom configured to be coupled to a first longitudinal end of the boom and at least one active element coupled to the VHF boom; and a UHF section including a UHF boom configured to be coupled to a second longitudinal end of the boom opposite the first longitudinal end and a plurality of passive elements coupled to the UHF boom.

Abstract: An antenna assembly for receiving television signals on both very high frequency (VHF) bands and ultra high frequency (UHF) bands, the antenna assembly including: a main section including an elongated boom, at least one active element coupled to the boom, and at least one passive element coupled to the boom; a VHF section including a VHF boom configured to be coupled to a first longitudinal end of the boom and at least one active element coupled to the VHF boom; and a UHF section including a UHF boom configured to be coupled to a second longitudinal end of the boom opposite the first longitudinal end and a plurality of passive elements coupled to the UHF boom.

Abstract: A waveguide device having a plurality of waveguide members is provided. The waveguide device is of an integral cast construction and is configured so that the cross-sectional dimensions of each waveguide member decrease along an axis thereof from one end to the other end. Methods of forming the waveguide device are also provided.

Abstract: A waveguide device having a plurality of waveguide members is provided. The waveguide device is of an integral cast construction and is configured so that the cross-sectional dimensions of each waveguide member decrease along an axis thereof from one end to the other end. Methods of forming the waveguide device are also provided.

Abstract: According to the present invention, a waveguide assembly is provided and includes a common input waveguide aligned along a first axis. The input waveguide supports two frequency bands and one or more polarities, namely high and low band signals of two polarities which are typically supplied using a feed horn which is coaxially aligned with the input waveguide. The waveguide assembly also includes an output waveguide for supporting and discharging the low band signal (one or more polarities). The output waveguide extends along a second axis which is parallel to the first axis containing the input waveguide but is displaced therefrom. In order to accomplish this the waveguide assembly has two or more waveguides connecting the input waveguide to the output waveguide.

Abstract: According to the present invention, a waveguide assembly is provided and includes a common input waveguide aligned along a first axis. The input waveguide supports two frequency bands and one or more polarities, namely high and low band signals of two polarities which are typically supplied using a feed horn which is coaxially aligned with the input waveguide. The waveguide assembly also includes an output waveguide for supporting and discharging the low band signal (one or more polarities). The output waveguide extends along a second axis which is parallel to the first axis containing the input waveguide but is displaced therefrom. In order to accomplish this the waveguide assembly has two or more waveguides connecting the input waveguide to the output waveguide.

Abstract: A modified offset parabolic antenna is disclosed which provides improved gain when receiving satellite broadcasts from geosynchronous transmission sources spaced substantially 10 degrees apart. The surface of the reflector is defined by a Zernike expansion mapped to a unit circle. The values of the parameters of the Zernike expansion are selected to provide a shaped reflector surface which focuses beams from the three separate sources onto three focal points such that the gain of the antenna is maximized. A peak beam gain for an offset beam of substantially 33.9 dBi has been achieved.

Abstract: A slip joint polarizer including a stationary waveguide rotatably connected to a moveable waveguide, e.g. an ortho mode transducer, by a mating interface, such as a pair of rotatable mating flanges. The moveable waveguide is rotatable with respect to the stationary waveguide to adjust at least one of receive and transmit polarity. A probe extends axially in the moveable waveguide, passing through the mating interface and into the stationary waveguide. The probe may be attached to the moveable waveguide so that the two rotate simultaneously. Alternatively, the probe may rotate independent of the moveable waveguide to adjust for transmit polarity. During installation, the moveable waveguide is rotated with respect to the stationary waveguide in order to adjust receive and/or transmit polarity. Once properly adjusted, the rotatable mating flanges are locked together to prevent movement.

Abstract: A modified offset parabolic antenna is disclosed which provides improved gain when receiving satellite broadcasts from geosynchronous transmission sources spaced substantially 10 degrees apart. The surface of the reflector is defined by a Zernike expansion mapped to a unit circle. The values of the parameters of the Zernike expansion are selected to provide a shaped reflector surface which focuses beams from the three separate sources onto three focal points such that the gain of the antenna is maximized. A peak beam gain for an offset beam of substantially 33.9 dBi has been achieved.

Abstract: A signal generator for producing a plurality of signals having the same frequency but a constant phase difference includes first and second cavity oscillators coupled to each other via an appropriate wall and coupling apertures. A first output signal is extracted from the first oscillator at a first predefined location on the oscillator's outer wall, which location defines a first angle relative to the wall aperture which couples the first oscillator to the second. A second output signal is extracted from a predefined location on the outer wall of the second oscillator, which location defines a second angle relative to the aperture in the first oscillator. Because the two oscillators are coupled to each other, they will produce an output signal having substantially the same frequency. The phase difference between the two output signals is defined by the difference between the first and second angles.

Abstract: A shaped offset parabolic antenna is disclosed which provides improved gain when receiving satellite broadcasts from geosynchronous transmission sources spaced substantially 10 degrees apart. The surface of the reflector is defined by a Zernike expansion mapped to a unit circle. The values of the parameters of the Zernike expansion are selected to provide a shaped reflector surface which focuses beams from the three separate sources onto three focal points such that the gain of the antenna is maximized. A peak beam gain for an offset beam of substantially 33.9 dBi has been achieved.

Abstract: An antenna and mounting assembly permitting azimuth adjustment of antenna elevation and rotation of the antenna about a polarity axis includes a molded antenna having an integrally molded polarity plate formed on its back side. The polarity plate has a back planar surface perpendicular to the polarity axis and is configured to receive a mounting bracket. A suitable mounting bracket has a polarity portion and an elevation portion generally separated by a boundary line and being substantially perpendicular to each other. The polarity portion has a polarity slot in it and the elevation portion has an elevation mounting hole and an arcuate elevation slot lying along a circle having a center substantially corresponding to the position of the elevation hole. A first mounting member engages the mounting hole and polarity slot to secure the bracket to the polarity plate.

Abstract: An improved method and system for generating quadrature phase shift keying signals for use in data transmission is provided. A pair of oscillators are slaved to the transmit frequency and produce two quadrature signal components with the same frequency but 90 degrees out of phase. The two signal components are carried to separate bi-phase switches by mirrored waveguides. Each bi-phase switch has a reflective waveguide coupler which directs the received signal into a waveguide terminated by a hard short and has a controllable shorting plane spaced approximately one-quarter wavelength from the termination point. The shorting planes are controlled by the output data signals and each introduces a 180 degree phase shift in the respective signal component when activated. The reflective couplers direct the selectively phase shifted signal components to an in-phase combiner, where they are combined to produce the quadrature phase shift keyed output signal.

Abstract: A broad band waveguide polarizer having four axial ridges, one on each wall of the waveguide, is disclosed. The axial ridges are configured to provide different phase velocities for the orthogonal signal components of a linearly polarized input signal. The dimensions of the ridges are selected such that the net phase difference between the signal components is about 90 degrees at a predetermined signal frequency. The quad ridge polarizer may be manufactured as an integral die cast device.

Abstract: An ortho-mode transducer is disclosed having a common waveguide and two orthogonal port waveguides, each of which is also orthogonal to the common waveguide. Each port waveguide is coupled to the common waveguide with a coupling aperture which will pass signals having a particular polarity and cut off orthogonally polarized signals. The common waveguide is terminated in a shorting plane about one-quarter of the excepted signal wavelength from the vertical midpoint of the port waveguides. The short directs energy from the common waveguide into the port waveguides and directs energy from the port waveguides into the common waveguide.