Other

Hughes Aircraft Company

Steven A Vaughn

Ronald E Sorace

Victor S Reinhardt

James A Verkade

Operating on the principle of vector summation, a predistortion linearizer includes a signal divider on one side of a substrate plate that divides a microwave signal into a linear portion and a nonlinear portion. Signal energy on both the nonlinear and linear portions is coupled into two respective slotline transmission lines on the substrate by uniplanar Magic T hybrids. As the signals are transmitted along the slotlines, their relative amplitudes and phases are adjusted to introduce a distortion inverse to that expected in a subsequent amplification. The linear portion and nonlinear portion pass through another pair of baluns. The signals are then combined by an in-phase summation on the same side of the plate as the input signal divider.

Predistortion linearizer and method employing uniplanar Magic T hybrids

A plurality of biphase modulators (42) each modulate a sinusoidal radio frequency signal based upon a corresponding one of a plurality of bits contained in a time-dependent data word. The biphase modulators (42) form a plurality of biphase modulated signals which are communicated to a summing network (40). The summing network (40) contains a plurality of attenuators (44) which attenuate the modulated signals to form a plurality of attenuated signals. The summing network (40) combines the attenuated signals to form a radio frequency signal.

High-speed digital-to-RF-converter

A slotline binary phase shift keyed (BPSK) modulator that is capable of operating at high frequency with relatively low sensitivity to terminating impedance. The slotline BPSK modulator comprises a slotline formed in a conductive layer disposed on a substrate, and a pair of diodes coupled to the conductive layer and disposed across the slotline. An RF carrier input signal is coupled to the slotline using a microstrip-to-coplanar line transition that forms one portion of a balanced transformer. The balanced transformer applies the RF carrier input signal with equal amplitude and 180 degree phase difference to each of the diodes. A modulating baseband signal is injected into the microstrip-to-coplanar line transition through a microstrip line and a lumped element low pass filter coupled to the microstrip-to-coplanar line transition. A direct via hole is provided for coupling a baseband modulating signal from the microstrip-to-coplanar line transition to the diodes. An output BPSK signal is extracted through a slotline-to-microstrip transition that forms a second portion of the transformer. The modulator has less sensitivity to terminating impedance and operates at relatively high frequency, on the order of 3.8 gigabits per second.

High speed slotline BPSK modulator

A sissy bar kit for post-manufacture installation on a motorcycle, which sissy bar kit includes a sissy bar and a support member for ready installation on a wide variety of existing motorcycles.

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Sun City, CA, United States of America

Steven A Vaughn