High speed slotline BPSK modulator

Details High speed slotline BPSK modulator High speed slotline BPSK modulator

1995-01-26

1996-04-02

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332105, 375279, 375308, H04L 2720

Patent

active

055044611

ABSTRACT:
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.

REFERENCES:
patent: 4276521 (1981-06-01), Davidheiser
patent: 4496918 (1985-01-01), Thorpe

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